CN106861626B - Adsorption-photocatalysis dual-function material, preparation method thereof and application thereof in volatile organic gas treatment process - Google Patents

Abstract

The invention discloses an adsorption-photocatalytic bifunctional material, a preparation method thereof, and an application in a volatile organic gas treatment process. The preparation method includes: dissolving 2-aminoterephthalic acid and iron element precursor in N,N-dimethylformamide, adding methanol solvent, stirring evenly, adding titanium element precursor, stirring, and subjecting the mixed solution to water Thermal synthesis reaction; after the product is washed with DMF and methanol in sequence, the product is extracted by centrifugal filtration, the product is put into a methanol solution for purification, and finally the product is extracted by centrifugal filtration, and dried to obtain an adsorption-photocatalytic bifunctional material. The adsorption-photocatalytic bifunctional material of the invention has high VOCs adsorption capacity selectivity and visible light photocatalytic degradation efficiency, and the inventive process can realize the VOCs adsorption-photocatalytic degradation cycle operation under normal temperature, normal pressure and visible light radiation, the process is simple, and the energy Low consumption, can realize semi-continuous deep purification of waste gas containing VOCs.

Description

A kind of adsorption-photocatalytic bifunctional material and preparation method thereof and in volatile organic Application of gas treatment process

technical field

The invention belongs to the field of material preparation, and in particular relates to an adsorption-photocatalysis bifunctional material, a preparation method thereof, and an application in a volatile organic gas treatment process.

Background technique

At present, thousands of factories in my country still discharge a large amount of volatile organic compounds (VOCs) into the environment unorganized, which is one of the main sources of air pollution today. VOCs pollution has seriously threatened human health, destroyed the ecological balance of the environment, and restricted the sustainable development of society. It has aroused strong public dissatisfaction and great concern from the government. Therefore, it is urgent to effectively control the pollution of VOCs. Therefore, the research and development of key materials and technologies for VOCs emission control has great national needs and practical significance.

In order to effectively control VOCs pollution in organic waste gas, the technologies widely used at home and abroad include catalytic combustion method, adsorption method, absorption method, etc. In recent years, the treatment technologies studied include biofilm method, photocatalytic oxidation method, plasma method, etc. 1YuB.F.;Hu Z.B.;Liu M.;Yang H.L;Kong Q.X.;Liu Y.H.,Review of research on air-conditioning systems and indoor air quality control for humanhealth.International Journal of Refrigeration.2009,32,3-20] . Among them, the adsorption method is currently considered to be the most promising treatment technology for large air volume and low concentration of VOCs (hundreds of ppm). Adsorption is a separation technology with porous materials as the core. -30]. It can effectively adsorb volatile organic pollutants in waste gas, and has been widely used in the purification of organic waste gas and the recovery of VOCs. However, the key bottleneck problems faced by the current adsorption technology for VOCs treatment include: (1) Although adsorption is a spontaneous process, the adsorption capacity of the adsorbent for VOCs is limited; (2) When the adsorption of VOCs by the adsorbent is close to saturation, it needs to be carried out. Regeneration, and regeneration is a process that requires external energy. Conventional adsorbent regeneration methods, such as thermal desorption, solvent elution [3 Ding Zhaobing; Li Di; Li Bo, Review of Research on Indoor Air Purification Technology. Research on Trace Elements and Health. 2008, 25, 63-68], etc., inevitably It causes secondary pollution, high energy consumption or complex process, which directly determines the feasibility and economy of adsorption technology. The regeneration of adsorbents is also a key point for adsorption technology to be applied to practical industries, but it is often ignored in the research process. At the same time, there are few reports on adsorption technologies with high VOCs adsorption capacity and low energy consumption without causing secondary pollution during the regeneration process of the adsorbent. Therefore, the study of new adsorbents with high VOCs adsorption capacity and the technology that the adsorbent does not cause secondary pollution during the regeneration process will have an important role in promoting the practical industrial application of adsorption technology, and it is worthy of key research in academia and industry.

Metal-Organic Frameworks (MOFs) are a class of porous organic-inorganic hybrid crystalline materials with periodic wireless network structure formed by metal ions or metal clusters and organic ligands through self-assembly process. MOFs materials have rich and regular pore structure, ultra-high specific surface area and ultra-large pore volume, adjustable pore size and surface chemical properties, and contain unsaturated metal sites, etc., and have been widely used in sustainable energy and environmental governance. prospect. In terms of VOCs adsorption, Yang Kun et al. reported the adsorption of VOCs by MIL-101(Cr) material, and the adsorption capacity of toluene at 25 °C reached 11.91 mmol/g. [4 Yang K.; Sun Q.; Xue R; Lin D.H., Adsorption of volatileorganic compounds by metal-organic frameworks MIL-101: influence of molecular size and shape. Journal of Hazardous materials. 2011, 195, 124-131] Our previous study It was also found that HKUST-1 had an adsorption capacity of 6.90 mmol·g ^-1 for benzene at 298 K and 8 kPa. [5 Li Yujie, Miao Jinpeng, Sun Xuejiao, Xiao Jing, Xia Qibin, Xi Hongxia, Li Zhong, Mechanochemical synthesis of metal-organic framework material HKUST-1 and its adsorption performance for benzene. 2015, 66, 793-799] However, at the same time, with high VOCs adsorption The adsorption-photocatalytic bifunctional metal-organic framework materials with high capacity and high VOCs photocatalytic degradation activity, and the VOCs adsorption-photocatalytic coupling treatment process based on such materials have not been reported.

SUMMARY OF THE INVENTION

In order to overcome the shortcomings and deficiencies of the prior art, the primary purpose of the present invention is to invent an adsorption-photocatalytic bifunctional material and a new process for treating volatile organic gases. The adsorption-photocatalytic bifunctional material has both high VOCs adsorption capacity and high VOCs photocatalytic degradation activity; and the VOCs treatment technology based on the adsorption-photocatalytic bifunctional material can realize semi-continuous adsorption purification-photocatalytic degradation at the same time. The material regeneration process, and the material regeneration process does not cause secondary pollution and low energy consumption.

The object of the present invention is achieved through the following technical solutions:

An adsorption-photocatalytic bifunctional material and a preparation method thereof, comprising the following steps:

(1) Dissolve 2-aminoterephthalic acid and iron precursor in N,N-dimethylformamide (DMF), add methanol solvent, stir evenly, add titanium precursor, continue to stir evenly, then add The mixed solution is subjected to a hydrothermal synthesis reaction;

(2) After the product is washed with DMF and washed with methanol in turn, the product is extracted by centrifugal filtration, the product is put into methanol solution for purification, the solvent is regularly replaced during the period, and finally the product is extracted by centrifugal filtration, and dried to obtain an iron-titanium bimetallic organic framework material , namely adsorption-photocatalytic bifunctional materials.

In the above method, the iron element precursor is iron nitrate, iron chloride, iron sulfate or iron oxide; the titanium element precursor is tetrabutyl titanate, tetraisopropyl titanate, titanium oxysulfate, tetrachloride Titanium oxide or titanium nitrate; the iron element precursor and the titanium element precursor satisfy that the molar ratio of titanium to iron is 0.5-2; the molar ratio of the 2-aminoterephthalic acid to the iron element precursor is 0.5-3 The temperature of the hydrothermal synthesis reaction solution is 120～180°C; the reaction time of the hydrothermal synthesis is 48～72h; the centrifugal speed is 6000～9000r/min; the drying temperature is 80～150°C.

In the above method, the Ti mass percentage of the iron-titanium bimetallic metal organic framework bifunctional catalytic adsorption material is 0.5-3.0 wt.%; the light absorption sideband is 700-800 nm, and the crystal size is 500-800 nm in length and 100 in width. ~600nm.

An adsorption-photocatalytic dual-functional material treatment process for volatile organic gases, comprising the following steps:

(1) Pass the air containing VOCs into the bed filled with adsorption-photocatalytic bifunctional material, and the bed of adsorption-photocatalytic bifunctional material adsorbs VOCs, thereby obtaining clean air;

(2) When the adsorption-photocatalytic bifunctional material bed is close to adsorption saturation, the light source is turned on, so that the VOCs enriched on the surface of the adsorption-photocatalytic bifunctional material undergo photocatalytic degradation to generate CO ₂ and H ₂ O, which effectively avoids the regeneration process. The secondary pollution and energy consumption caused by the desorption of VOCs in the medium are eliminated. At the same time, the bed of the adsorption-photocatalytic bifunctional material is regenerated and enters the next adsorption-photocatalytic cycle.

In the volatile organic gas treatment process of the above adsorption-photocatalytic bifunctional material, in step (1), the VOCs are toluene, benzene, formaldehyde or isopropanol; the content of the VOCs in the air is 50-300ppm; The gas flow rate is 5-20ml/min; in step (2), the regeneration environment is room temperature; the photocatalytic regeneration light source is 100-300mW/cm ² ; the regeneration time is 2-6h.

In the volatile organic gas treatment process of the above adsorption-photocatalytic dual-functional materials, the adsorption rate of VOCs reaches more than 95%; after photocatalytic regeneration, the VOCs adsorption performance of the material remains more than 90% of the original. The working principle of the present invention:

Adsorption-photocatalytic bifunctional materials have both adsorption and photocatalytic functions. Traditional materials often only have one of these functions, such as molecular sieves and activated carbon, which have a certain specific surface area to function as catalysts, but have limited potential as photocatalysts; while metal oxides such as TiO ₂ and CdS have photocatalytic properties. active, but limited specific surface area and thus limited potential as an adsorbent. Metal-organic frameworks are a class of organic-inorganic hybrid materials with ultra-high specific surface area and pore structure order, which have both high specific surface area and semiconducting properties, so they have the potential to be designed as adsorption-photocatalytic bifunctional materials. The iron-titanium bimetallic organic framework material adsorption-photocatalytic bifunctional material of the present invention has a strong VOCs adsorption capacity because of the metal-organic hybrid framework structure; since the organic-inorganic hybrid material is doped with titanium element , which improves the conduction band position of the semiconductor, thereby improving the reducing ability of the material, so it has the ability to generate photogenerated electrons and oxygen combined to generate peroxy anions under illumination conditions, thereby oxidizing VOCs.

The new process principle of VOCs treatment based on adsorption-photocatalytic bifunctional metal organic framework materials is as follows: the surface of the bifunctional material has both VOCs adsorption sites and photocatalytic sites. When the VOCs-containing waste gas passes through the material bed, the adsorption sites on the material surface will be selective. When the bed is close to adsorption saturation, the VOCs enriched on the surface of the material will be degraded by photocatalytic sites to generate CO ₂ and H ₂ O under the radiation of the light source, which effectively avoids the regeneration process. The secondary pollution and energy consumption caused by VOCs desorption, at the same time, the adsorption-photocatalytic bifunctional material bed can be regenerated and enter the next adsorption-photocatalytic cycle.

Compared with the prior art, the present invention has the following advantages and effects:

1. The adsorption-photocatalytic bifunctional material of the present invention has high VOCs adsorption capacity selectivity and visible light photocatalytic degradation efficiency;

2. The process of the invention can realize VOCs adsorption-photocatalytic degradation (regeneration) cycle operation under normal temperature, normal pressure and visible light radiation, the process is simple, the energy consumption is low, and the semi-continuous deep purification of VOCs-containing waste gas can be realized.

Description of drawings

Figure 1 is a process diagram of VOCs treatment based on adsorption-photocatalytic bifunctional materials;

Fig. 2 is the XRD spectrum of embodiment 1 to embodiment 4 of the present invention;

Fig. 3a is the TEM-EDS figure of the embodiment of the present invention 2;

Fig. 3b is the element distribution of example 2;

Fig. 4 is the UV-Vis spectrogram of the embodiments 1 to 4 of the present invention;

Fig. 5 is the valence band XPS spectrogram of the embodiment of the present invention 2;

Fig. 6 is the adsorption performance diagram of formaldehyde, toluene, isopropanol, and benzene in Examples 1 to 4 of the present invention;

7 is a graph showing the visible light degradation performance of formaldehyde, toluene, isopropanol and benzene in Examples 1 to 4 of the present invention.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and the embodiments, but the scope of protection of the present invention is not limited to the scope of the embodiments.

Example 1

1. Preparation of bifunctional adsorption-photocatalytic metal-organic frameworks

(1) Dissolve 1.054g of 2-aminoterephthalic acid and 5.16g of iron precursor iron oxide in N,N-dimethylformamide (DMF), add methanol solvent, stir evenly, and then add 0.26ml of tetrachloride Titanium was removed, and after stirring evenly, the mixture was subjected to hydrothermal synthesis reaction at 120 °C for 72 h.

(2) After the product is washed with DMF and methanol in sequence, the product is extracted by centrifugal filtration, the product is put into methanol solution for purification, the solvent is changed regularly during the period, and finally the product is extracted by centrifugal filtration, and dried at 150 ° C to obtain the iron-titanium bimetallic Organic frame material.

2. A new process for VOCs treatment based on bifunctional adsorption-photocatalytic metal organic framework materials

(1) The air with a formaldehyde content of 300 ppm is passed into the bed filled with adsorption-photocatalytic bifunctional material at a flow rate of 5 ml/min, and the bed of adsorption-photocatalytic bifunctional material can selectively adsorb formaldehyde, thereby obtaining clean air;

(2) When the bed of the adsorption-photocatalytic bifunctional material is close to the adsorption saturation, turn on the light source of 100 mW/ ^cm2 light intensity for 6 h, so that the VOCs enriched on the surface of the adsorption-photocatalytic bifunctional material undergo photocatalytic degradation to generate _CO and H. ₂ O, which effectively avoids the secondary pollution and energy consumption caused by the desorption of VOCs during the regeneration process. At the same time, the adsorption-photocatalytic bifunctional material bed can be regenerated and enter the next adsorption-photocatalytic cycle.

Example 2

1. Preparation of bifunctional adsorption-photocatalytic metal-organic frameworks

(1) Dissolve 1.054g 2-aminoterephthalic acid and 3.18g iron precursor ferric sulfate in N,N-dimethylformamide (DMF), add methanol solvent, stir evenly, add 0.52ml oxygen sulfate Titanium, after continuing to stir evenly, the mixture was hydrothermally synthesized at 160 °C for 60 h.

(2) After the product is washed with DMF and methanol in turn, the product is extracted by centrifugal filtration, the product is put into methanol solution for purification, the solvent is changed regularly during the period, and finally the product is extracted by centrifugal filtration, and dried at 120 ° C to obtain the iron-titanium bimetallic Organic frame material.

2. A new process for VOCs treatment based on bifunctional adsorption-photocatalytic metal organic framework materials

(1) The air with a toluene content of 200 ppm is passed into the bed filled with adsorption-photocatalytic bifunctional material at a flow rate of 10 ml/min, and the bed of adsorption-photocatalytic bifunctional material can selectively adsorb toluene, thereby obtaining clean air;

(2) When the bed of the adsorption-photocatalytic bifunctional material is close to the adsorption saturation, turn on the light source of 200 mW/ ^cm2 light intensity for 5 h, so that the toluene enriched on the surface of the adsorption-photocatalytic bifunctional material undergoes photocatalytic degradation to generate _CO and H. ₂ O, which effectively avoids the secondary pollution and energy consumption caused by toluene desorption during the regeneration process. At the same time, the adsorption-photocatalytic bifunctional material bed can be regenerated and enter the next adsorption-photocatalytic cycle.

Example 3

1. Preparation of bifunctional adsorption-photocatalytic metal-organic frameworks

(1) Dissolve 1.054g 2-aminoterephthalic acid and 2.58g iron precursor ferric nitrate in N,N-dimethylformamide (DMF), add methanol solvent, stir evenly, add 0.78ml titanic acid Tetraisopropyl ester, after continuing to stir evenly, the mixture was subjected to hydrothermal synthesis reaction at 120°C for 48h.

(2) After the product is washed with DMF and methanol in turn, the product is extracted by centrifugal filtration, the product is put into methanol solution for purification, the solvent is changed regularly during the period, and finally the product is extracted by centrifugal filtration, and dried at 100 ° C to obtain the iron-titanium bimetallic Organic frame material.

2. A new process for VOCs treatment based on bifunctional adsorption-photocatalytic metal organic framework materials

(1) The air with the isopropanol content of 100 ppm is passed into the bed of the filled adsorption-photocatalytic bifunctional material at a flow rate of 15 ml/min, and the bed of the adsorption-photocatalytic bifunctional material can selectively adsorb isopropanol, thereby obtaining clean air;

(2) When the bed of the adsorption-photocatalytic bifunctional material is close to the adsorption saturation, turn on the light source of 150 mW/ ^cm2 light intensity for 4 h, so that the enriched isopropanol on the surface of the adsorption-photocatalytic bifunctional material undergoes photocatalytic degradation to generate _CO2 and H ₂ O, which effectively avoids the secondary pollution and energy consumption caused by isopropanol desorption during the regeneration process.

Example 4

1. Preparation of bifunctional adsorption-photocatalytic metal-organic frameworks

(1) Dissolve 1.054g 2-aminoterephthalic acid and 1.29g iron precursor ferric chloride in N,N-dimethylformamide (DMF), add methanol solvent, stir evenly, add 1.04ml titanium tetrabutyl acid, and after continuing to stir evenly, the mixture was subjected to a hydrothermal synthesis reaction at 150 °C for 72 h.

(2) After the product was washed with DMF and methanol in sequence, the product was extracted by centrifugal filtration, the product was put into methanol solution for purification, the solvent was changed regularly during the period, and finally the product was extracted by centrifugal filtration, and dried at 80 ° C to obtain the iron-titanium bimetallic Organic frame material.

2. A new process for VOCs treatment based on bifunctional adsorption-photocatalytic metal organic framework materials

(1) The air with a benzene content of 50 ppm is passed into the bed filled with adsorption-photocatalytic bifunctional material at a flow rate of 20 ml/min, and the bed of adsorption-photocatalytic bifunctional material can selectively adsorb benzene, thereby obtaining clean air;

(2) When the bed of the adsorption-photocatalytic bifunctional material is close to the adsorption saturation, turn on the light source of 300 mW/ ^cm2 light intensity for 5 h, so that the benzene enriched on the surface of the adsorption-photocatalytic bifunctional material undergoes photocatalytic degradation to generate _CO and H. ₂ O, which effectively avoids the secondary pollution and energy consumption caused by benzene desorption during the regeneration process. At the same time, the adsorption-photocatalytic bifunctional material bed can be regenerated and enter the next adsorption-photocatalytic cycle.

The present invention proposes a bifunctional adsorption-photocatalytic metal-organic framework material and a new VOCs treatment process. Its titanium content, crystal structure, light absorption range, VOCs adsorption performance and VOCs photocatalytic degradation performance are as follows:

(1) Titanium content of porous iron-titanium bimetallic organic frameworks

A Varian 715-ES plasma emission spectrometer was used to analyze the iron and titanium content of Examples 1 to 4 of the present invention, and the results are shown in Table 1.

It can be seen from Table 1 that the iron-titanium content ratio in the iron-titanium bimetallic organic framework material prepared by the present invention is consistent with the change trend of the feeding amount, and the final titanium content increases with the increase of the titanium molar ratio in the precursor.

(2) Crystal structure properties of iron-titanium bimetallic organic frameworks

Example 1 (Fe-Ti-1), Example 2 (Fe-Ti-2), Example 3 (Fe-Ti-3) and Example 4 of the present invention were analyzed by a D8-ADVANCE X-ray diffractometer from Bruker, Germany. The crystal structure of (Fe-Ti-4) was characterized respectively, and the operating conditions were: Cu target Kα light source, the current in the radiant tube was 40mA, the voltage was 40kv, the continuous scanning mode, the scanning angle range was 5-40°, and the scanning speed was 0.1 sec/step, the scan step size is 0.02°.

Inventive Example 1 (Fe-Ti-1), Example 2 (Fe-Ti-2), Example 3 (Fe-Ti-3) and Example 4 (Fe-Ti-4) and The XRD pattern of pure iron-based MOF can be seen from Figure 2. With the increase of Ti content, the main peak at about 8° gradually shifts to the left, indicating that Ti enters the lattice and replaces the position of Fe. Since the radius of Ti ions is larger than that of Fe, the crystal frame is twisted and increased, and the peak position is shifted to the left.

(3) Crystal morphology and element distribution of Fe-Ti bimetallic organic frameworks

The crystal morphology and element distribution of Fe-Ti bimetallic organic frameworks were analyzed by JEM-2100 transmission electron microscope. FIG. 3a shows the morphology of Example 2 of the present invention under an electron microscope, and FIG. 3b shows the element distribution of Example 2 of the present invention. It can be seen from Figure 3a that the material is an ellipsoid with a length of 900 nm and a width of 200 nm. In addition, according to the analysis of electron energy spectrum, it is found that the representative elements Fe and Ti can be distributed throughout the whole crystal, which proves that both Fe and Ti can be uniformly distributed on the whole frame.

(4) UV-Vis absorption spectroscopic analysis of iron-titanium bimetallic organic frameworks

The UV-Vis absorption of iron-titanium bimetallic organic framework materials was analyzed by UV-Vis spectrometer from Shimadzu Corporation of Japan. Figure 4 shows the invention Example 1 (Fe-Ti-1), Example 2 (Fe-Ti-2), Example 3 (Fe-Ti-3) and Example 4 (Fe-Ti-4) with pure The UV absorption spectrum of the iron-based MOF can be seen from the figure, with the increase of Ti content, the absorption sideband appears blue-shifted, indicating that the forbidden band width is increasing.

(5) Valence band XPS spectra of iron-titanium bimetallic organic frameworks

The valence band of iron-titanium bimetallic organic frameworks was measured by ESCALAB 250Xi X-ray photoelectron spectroscopy. FIG. 5 shows the comparison of the valence band of Example 2 of the present invention and the valence band of pure iron-based MOF. It can be seen from Figure 5 that the introduction of Ti can increase the valence band of the material. The valence band of Fe-Ti-2 is 2.38 eV, and Fe-MOF is 2.64 eV. Combined with the UV absorption spectrum, it can be seen that the conduction band is higher than that of pure iron base. The MOF will have a higher lift and the reducing power of the sample will also be enhanced.

(6) Adsorption properties of iron-titanium bimetallic organic framework materials for formaldehyde, toluene, isopropanol and benzene

The saturated adsorption amount of VOC in Example 2 (Fe-Ti-2) of the present invention was measured by using the AUTOSORB-1 gas adsorption instrument of Quantachrome Company in the United States. It can be seen from Figure 6 that Fe-Ti-2 has high adsorption capacity for formaldehyde, toluene, isopropanol, and benzene, indicating that the material has the ability to adsorb VOCs.

(7) Visible light degradation performance of iron-titanium bimetallic organic framework materials to formaldehyde, toluene, isopropanol and benzene

The PLS-SXE300 xenon lamp of Beijing Bofeilai Company was used as the light source, and the 420nm filter was used as the light source. The VOC content was detected by GC9560 gas chromatograph and hydrogen flame ionization detector. A 100ml reaction vessel was filled with dry air with a concentration of 300ppm of VOC (formaldehyde, toluene, isopropanol or benzene), after reaching the adsorption equilibrium, the light was illuminated for 6h, and samples were taken to test the remaining VOC content.

Figure 7 shows the photocatalytic degradation rate of VOC of Example 2 (Fe-Ti-2) of the present invention, and the degradation rates of formaldehyde, toluene, isopropanol, and benzene are 98%, 90%, 95%, and 86%, respectively. , indicating that the sample has high photocatalytic reaction ability.

Table 1 iron and titanium content of iron-titanium bimetallic metal organic framework material of the present invention

The above-mentioned embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, The simplification should be equivalent replacement manners, which are all included in the protection scope of the present invention.

Claims (3)

1. a preparation method of adsorption-photocatalytic bifunctional material, is characterized in that, comprises the steps: (1) Dissolve 2-aminoterephthalic acid and iron precursor in N,N-dimethylformamide (DMF), add methanol solvent, stir evenly, add titanium precursor, continue stirring, The mixed solution is subjected to a hydrothermal synthesis reaction; (2) After the product is washed with DMF and methanol in sequence, the product is extracted by centrifugal filtration, the product is put into methanol solution for purification, the solvent is regularly replaced during the period, and finally the product is extracted by centrifugal filtration, and dried to obtain an iron-titanium bimetallic organic framework material , namely adsorption-photocatalytic bifunctional materials; The iron element precursor is iron nitrate, iron chloride, iron sulfate or iron oxide; the titanium element precursor is tetrabutyl titanate, tetraisopropyl titanate, titanium oxysulfate, titanium tetrachloride or nitric acid titanium; the iron element precursor and the titanium element precursor satisfy that the molar ratio of titanium to iron is 0.5-2; the molar ratio of the 2-aminoterephthalic acid to the iron element precursor is 0.5-3; the water The temperature of the thermal synthesis reaction solution is 120-180 °C; the hydrothermal synthesis reaction time is 48-72 h; the centrifugal rotation speed is 6000-9000 r/min; the drying temperature is 80-150 °C; The mass percentage of Ti of the iron-titanium bimetallic organic framework bifunctional catalytic adsorption material is 0.5-3.0 wt.%; the light absorption sideband is 700-800 nm; the crystal size of the iron-titanium bimetallic organic framework bifunctional catalytic adsorption material is 500~800 nm long and 100~600 nm wide; The application of the adsorption-photocatalytic bifunctional material in the volatile organic gas treatment process includes the following steps: (1) Pass the air containing VOCs into the bed filled with adsorption-photocatalytic bifunctional material, and the bed of adsorption-photocatalytic bifunctional material adsorbs VOCs, thereby obtaining clean air; (2) When the adsorption-photocatalytic bifunctional material bed is close to adsorption saturation, the light source is turned on, so that the VOCs enriched on the surface of the adsorption-photocatalytic bifunctional material undergo photocatalytic degradation to generate CO ₂ and H ₂ O. At the same time, the adsorption - The photocatalytic bifunctional material bed is regenerated to enter the next adsorption-photocatalytic cycle. 2. according to the preparation method of adsorption-photocatalytic bifunctional material described in claim 1, it is characterized in that, in step (1), described VOCs is toluene, benzene, formaldehyde or isopropanol; Described VOCs is in air The content is 50～300 ppm; Described gas flow rate is 5～20 mL/min; In step (2), described regeneration environment is room temperature; Described photocatalytic regeneration light source is 100～300mW/cm ^; The regeneration time is 2 to 6 hours. 3. according to the preparation method of adsorption-photocatalytic bifunctional material described in claim 2, it is characterized in that, the adsorption rate of VOCs reaches more than 95%; The VOCs adsorption performance of material after photocatalytic regeneration keeps original more than 90%.

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