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Keywords = underliquid superlyophobic

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16 pages, 4110 KiB  
Article
Nanosheet BiOBr Modified Rock Wool Composites for High Efficient Oil/Water Separation and Simultaneous Dye Degradation by Activating Peroxymonosulfate
by Li Lin, Si Xiao, Chuxuan Wang, Manhong Huang, Ling Xu and Yi Huang
Molecules 2024, 29(13), 3185; https://doi.org/10.3390/molecules29133185 - 4 Jul 2024
Viewed by 1095
Abstract
The development of superlyophobic materials in liquid systems, enabling synchronous oil/water separation and dye removal from water, is highly desirable. In this study, we employed a novel superwetting array-like BiOBr nanosheets anchored on waste rock wool (RW) fibers through a simple neutralization alcoholysis [...] Read more.
The development of superlyophobic materials in liquid systems, enabling synchronous oil/water separation and dye removal from water, is highly desirable. In this study, we employed a novel superwetting array-like BiOBr nanosheets anchored on waste rock wool (RW) fibers through a simple neutralization alcoholysis method. The resulting BiOBr/RW fibers exhibited superoleophilic and superhydrophilic properties in air but demonstrated underwater superoleophobic and underoil superhydrophobic characteristics. Utilizing its dual superlyophobicity, the fiber layer demonstrated high separation efficiencies and flux velocity for oil/water mixtures by prewetting under a gravity-driven mechanism. Additionally, the novel BiOBr/RW fibers also exhibited excellent dual superlyophobicity and effective separation for immiscible oil/oil systems. Furthermore, the BiOBr/RW fibers could serve as a filter to continuously separate oil/water mixtures with high flux velocity and removal rates (>93.9%) for water-soluble dye rhodamine B (RhB) simultaneously by directly activating peroxymonosulfate (PMS) in cyclic experiments. More importantly, the mechanism of simultaneous oil/water separation and RhB degradation was proposed based on the reactive oxygen species (ROS) quenching experiments and electron paramagnetic resonance (EPR) analysis. Considering the simple modified process and the waste RW as raw material, this work may open up innovative, economical, and environmentally friendly avenues for the effective treatment of wastewater contaminated with oil and water-soluble pollutants. Full article
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Figure 1

Figure 1
<p>Digital photos and SEM images ((<b>a</b>) pristine RW; (<b>b</b>) BiOBr/RW), EDS spectra of BiOBr/RW (<b>c</b>), and EDS mapping images of BiOBr/RW (<b>d</b>–<b>i</b>).</p> Full article ">Figure 2
<p>XRD patterns of the samples (<b>a</b>), HRSEM images of BiOBr/RW (<b>b</b>,<b>c</b>), and HRTEM images of BiOBr/RW (<b>d</b>–<b>f</b>).</p> Full article ">Figure 3
<p>Photos of different liquid wetting behavior and corresponding contact angle (insets) under various environments on BiOBr/RW fibers (<b>a</b>–<b>d</b>) and pristine RW (<b>e</b>–<b>h</b>), respectively.</p> Full article ">Figure 4
<p>Photos of penetration process on BiOBr/RW surface in the air ((<b>a</b>) water droplet; (<b>b</b>): oil droplet).</p> Full article ">Figure 5
<p>CA<sub>o/w</sub> and CA<sub>o/w</sub> of various oils detected on BiOBr/RW.</p> Full article ">Figure 6
<p>Dynamic interaction of water droplet underoil (ligarine) and oil (1,2-dichloroethane) droplet underwater on the surface of BiOBr/RW (<b>a</b>,<b>b</b>) and pristine RW (<b>c</b>,<b>d</b>) immersed in oil or water.</p> Full article ">Figure 7
<p>A dynamic liquid jet process on BiOBr/RW. Oil (Sudan red I dyed 1,2-dichloroethane) jet underwater (<b>a</b>,<b>b</b>) and water jet underoil (1,2-dichloroethane) (<b>c</b>,<b>d</b>).</p> Full article ">Figure 8
<p>Images of oil/water separation by BiOBr/RW ((<b>a</b>) prewetted by light oil; (<b>b</b>) prewetted by water; (<b>c</b>) prewetted by heavy oil; (<b>d</b>) prewetted by water); light oil and heavy oil were dyed with Sudan I.</p> Full article ">Figure 9
<p>The separation efficiency and flux for different oil/water mixtures.</p> Full article ">Figure 10
<p>Separation efficiency and flux of ligarine/water mixtures under different environments (<b>a</b>), the separation efficiency and contact angles detected by various immiscible liquids mixtures (Liquid 1 is diesel, n-heptane or ligarine; Liquid 2 is EG) (<b>b</b>).</p> Full article ">Figure 11
<p>Degradation of RhB in direct PMS activation system by BiOBr/RW (<b>a</b>), and the change of UV-vis spectra with time for RhB degradation in BiOBr/RW/PMS system (<b>b</b>).</p> Full article ">Figure 12
<p>The synchronous oil/water separation and PMS activation toward RhB removal ((<b>a</b>) BiOBr/RW; (<b>b</b>) pristine RW; (<b>c</b>) cycle results).</p> Full article ">Figure 13
<p>Quenching experiments results in the BiOBr/RW catalyst/PMS direct activation system (<b>a</b>) and ESR spectra in different systems: (<b>b</b>) <sup>1</sup>O<sub>2</sub>, (<b>c</b>) ·SO<sub>4</sub><sup>−</sup> and ·OH, and (<b>d</b>)·O<sub>2</sub><sup>−</sup>.</p> Full article ">Figure 14
<p>Mechanism of synchronous on-demand oil/water separation and PMS activation for pollutants removal by BiOBr/RW.</p> Full article ">
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