ENVIRONMENTAL POLLUTION
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2024
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IF 7.6
Xiaoman Yu,Menglin Liu,Haiming Xu,Jian Xu,Jiarui Yi
Enhancing adsorption ability of photocatalyst by vacancy is a fascinating strategy. Thus, Bi 2 WO 6 /BiOCl with millefeuille-like was successfully prepared via multi-pots method. Experimental results discern that BOW-10 can degraded 75.19% doxycycline hydrochloride (DOC, 20 mg/L) in 1 h, which is 1.3 and 3.5-fold larger than Bi 2 WO 6 and BiOCl, respectively. The mechanism revealed that OVs (oxygen vacancies) not only promote the adsorption of DOC and O 2 but also augment the activation ability of molecular oxygen. Therefore, photo-induced electrons can rapidly transfer from BiOCl to Bi 2 WO 6 via carrier transport channels formed by interface oxygen vacancies (IOVs) under interfacial electric field (IEF) to reduce the adsorbed O 2 . Finally, DOC was eliminated by O 2 ˙ - and h + . Moreover, the relationship of surface areas, OVs concentration and the separation efficiency of photo-generated carriers was constructed. Meanwhile, the degradation paths of DOC and the toxicity of the intermediates were comprehensively investigated through DFT theoretical calculation. This research provides an innovation approach to regulate the capability of pollution adsorption and molecular oxygen activation by vacancy engineering and heterostructure engineering.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Chemistry-Switzerland
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2022
·Vol. 4
·期 3
·765-775
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IF 0
Yi Zheng,Siqi Wang,Min Shu,Yi Wang,Dumeng Cao
Enhancing photocarrier separation is a key step of photocatalysis, and in situ constructed composition interface is an advanced method to achieve this aim. Therefore, we report a face-to-face Bi2WO6/BiOCl (BWOC) which was synthesized via the continuous in situ ion-exchange method. As UV light is harmful to the human body, BWOC exhibits excellent photocatalytic activity only in visible light, and this is an important feature because visible light is a human-friendly operating condition. Under 50 W visible LED lamp illumination, unexcited BiOCl (BOC) only extracts electrons of excited Bi2WO6(BWO), and holes remain on BWO, resulting in excellent photocarrier spatial separation efficiency through the face-to-face interface. This is why BWOC can be safe to use for the removal of hazardous substances. Compared with BWO and BOC, BWOC possesses 2.6 and 5.6 times higher photodegradation activity than RhB. This work provides a novel insight of efficient visible light photocatalytic system for environmental remediation.
研究领域:
环境科学
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材料科学
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DOI
Journal of Environmental Chemical Engineering
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2026
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IF 7.5
Yang Li,Yaling Zeng,Zhendong Ouyang,Yunxiao Wen,Jian Yang,Ximei Fan
The complete mineralization of aromatic VOCs via photocatalysis remains a grand challenge, limited by severe photogenerated carrier recombination and the easy formation of toxic refractory phenolic intermediates. Here, we demonstrate a solvent-mediated crystal facet engineering strategy to construct a Bi 2 WO 6 -BiOCl S-scheme heterojunction with oriented exposure of high-activity facets and abundant surface hydroxyl sites. The facet-tailored heterojunction achieves efficient spatial separation of photogenerated carriers via a strong built-in electric field, while retaining the strong redox capacity to generate abundant reactive oxygen species. The optimal catalyst delivers over 95% gaseous toluene removal and 94.9% mineralization efficiency within 1 h irradiation, with 99.7% of removed toluene converted to CO 2 , exceeding the aqueous-synthesized control, pure-phase counterparts, and most reported bismuth-based photocatalysts. In-situ diffuse reflectance infrared Fourier transform spectroscopy combined with theoretical calculations reveals that facet-induced surface hydroxyl sites act as specific adsorption and activation centers for toluene molecules, steering the degradation toward a benign benzyl alcohol-benzaldehyde-benzoic acid pathway and inhibiting the generation of toxic phenolic byproducts. This work clarifies the critical role of crystal facet engineering in coordinating heterojunction charge transfer and surface reaction pathway modulation, providing a new avenue for designing high-performance photocatalysts for the complete mineralization of aromatic VOCs.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Junlei Wang,Kuan Wang,Zhen-Hong He,Rong-Rong Zhang,Pengfei Guo,Weitao Wang,Yang Yang,Zhao-Tie Liu
Photocatalytic oxidation of cyclohexane (CHA) with air in solvent-free is an efficient and green approach for the production of cyclohexanol and cyclohexanone (KA oil). In the present work, ultrathin Bi 2 WO 6 /BiOCl heterojunction nanosheets are prepared by varying the amounts of potassium chloride (KCl) via a one-step solvothermal method. The oxygen vacancies (OV) in Bi 2 WO 6 /BiOCl nanosheets can be produced in situ during the photocatalysis. An efficient and selective photo-oxidation of CHA to KA oil with air as an oxidant in solvent-free was achieved over OV-Bi 2 WO 6 /BiOCl catalyst. The composition, structure, morphology, as well as textural, optical, and electrochemical properties of the photocatalysts are systematically analyzed by various characterization techniques. The photocatalytic activity (KA oil, 484.4 μmol) for the titled reaction was significantly improved over OV-Bi 2 WO 6 /BiOCl with 1.8 and 9.8 times compared with that by pure BiOCl and Bi 2 WO 6 catalysts, respectively. Meanwhile, up to 92.5% selectivity of KA oil and 5 cycles without photocatalytic activity loss were achieved. The photogenerated holes (h + ) and ·OH radicals are verified to be predominant reactive species by trapping experiments and electron paramagnetic resonance (EPR) tests. The excellent photocatalytic performance can be attributed to the enhanced photo-absorption, abundant oxygen vacancies, high exposure of active facets, and efficient electron-hole separation. Thereby, the present work offers a prospective strategy for constructing Bi-based photocatalyst with highly efficient and selective photocatalytic oxidation of CHA.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
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