APPLIED SURFACE SCIENCE
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2024
·
IF 6.3
Kuan Wang,Yi Wang,Dan Wang,Yuan-Xiao Du,Xin-Peng Li,Zhen-Hong He,Huan Wang,Weitao Wang,Yang Yang,Zhao-Tie Liu
The exploration of cost-efficient, environmentally friendly, and high-efficacy photocatalysts for the enhanced selective photooxidation of cyclohexane to KA oil (cyclohexanone (CHA-one) and cyclohexanol (CHA-ol)) is a pivotal challenge in the industrial realm. Herein, the present study focuses on the synthesis of needle-like S-scheme heterojunction photocatalysts with oxygen vacancies, which are achieved by the needle growth integration of nano-sized Nb 2 O 5 particles onto the BiOCl nanosheets. Remarkably, the 40 % Nb 2 O 5 /BiOCl composites exhibited superior performance in the solvent-free photooxidation of cyclohexane at room-temperature and under atmospheric pressure. The production yield of KA oil was 180.3 μmol (CHA-one/CHA-ol molar ratio = 3.5), and exceptional selectivity towards KA oil, reaching up to 99.3 %. The enhanced photocatalytic efficiency in cyclohexane oxidation can be attributed to the unique S-scheme heterogeneous interfaces with specific nanoneedle morphology, which result in the enhanced photonic absorption, effective charge carrier separation, a high density of oxygen vacancies, and the exposure of the highly reactive (001) plane of BiOCl. The excellent interfacial charge separation and transfer pathways of S-scheme heterojunction are disclosed by the in-depth EPR analysis and DFT calculations. These insights highlight the significant potential of the needle-like Bi-based S-scheme heterojunction photocatalysts for the efficient photooxidation of saturated alkanes.
研究领域:
材料科学
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催化化学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Runren Jiang,Guanghua Lu,Zhenhua Yan,Donghai Wu,Ranran Zhou,Xuhui Bao
The development of a novel Z-scheme system with a high separation efficiency of the charge carriers for remarkably enhanced photocatalytic activity is highly desirable. Herein, a carbon quantum dot-modified SnNb 2 O 6 /BiOCl (CQD-SNO/BOC) Z-scheme system, in which the CQDs acted as a bridge for the charge carriers, was successfully synthesized. As expected, the CQDs acted as a bridge for the charge carriers that could separate and accumulate electrons from SnNb 2 O 6 and holes from BiOCl by promoting the transfer of the photoinduced charge carriers, which enabled the BiOCl holes to maintain their high oxidation capability. Additionally, the CQDs not only endowed the SNO/BOC Z-scheme system with a large specific surface area that provided a greater number of active sites but also noticeably improved its visible light absorption capacity. Therefore, the CQD-SNO/BOC Z-scheme system showed an improved photocatalytic performance for the degradation of benzocaine (BC), which was over 20 times, 10 times and 2 times greater than those of BiOCl, SnNb 2 O 6 and SNO/BOC Z-scheme systems, respectively. In addition, the effects of catalyst concentration, pH value, different anions, and humic acid (HA) concentration on the photodegradation of BC were investigated in depth. Simultaneously, a four-stage pathway for the degradation of BC was proposed based on the degradation products that were identified, and the accuracy of this pathway was further verified based on biotoxicity assessments and toxicity predictions of the products. According to the ESR spectra and active species trapping experiments, a mechanism for the CQD-SNO/BOC Z-scheme system was proposed, in which the CQD bridge accelerated charge transfer. Based on these results, the CQD-modified Z-scheme system could be an efficient and promising photocatalyst for the degradation of PPCPs in water.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Yunxin Shi,Liying Wang,Xin Miao,Zhenzhu Cao,Yongfeng Zhang,Lin Cheng,Jucai Yang
A series of donut-like nanostructured heterojunction materials are first synthesized via one-step solvothermal method to improve the photocatalytic efficiency for the environmental pollutants. The unique donut-like Fe-doped-BiOCl@Fe-MOF heterojunction with uniform size guarantees suitable surface area and many active sites for the model pollutant. The optimal photocatalytic efficiency is shown in degradation of RhB (99.0 %, 90 min) and TC (90.4 %, 90 min) solution, which had higher photocatalytic efficiency than a variety of similar materials previously reported. The result revealed that the enhancing photocatalytic activity is mainly depended on the synergistic effect of Fe-MOF and Fe-doped BiOCl. The possible mechanism is further studied, which shown h + and O 2 − are the primary active species in the degradation process of RhB and TC solution. Meantime, Fe-doped BiOCl@Fe-MOF with the excellent reusability and stability. After the fourth cycle, the degradation rate of RhB solution can still be as high as 86.4 %. In this work, we provide a higher efficiency heterojunction photocatalytic material by varying the organic ligand content.
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
高影响因子
Catalysts
·
2021
·Vol. 11
·期 9
·1130
·
IF 4.146
Zhuangzhuang Zhang,Yuanyuan Zhang,Xuanxuan Han,Li Guo,Danjun Wang,Kangle Lv
The novel 2D/2D S-scheme heterostructure of BiOCl nanosheets coupled with CaIn2S4nanosheets (CaIn2S4/BiOCl-SOVs), which contains surface oxygen vacancies (SOVs), has been successfully prepared by high-temperature calcination combined with a solvothermal synthetic strategy. Under visible-light irradiation, the apparent rate constant (Kapp/mim−1) for phenol degradation on the 1 wt% CaIn2S4/BiOCl-SOVs photocatalyst is about 32.8 times higher than that of pure BiOCl. The superior performance was attributed to the synergistic effect between the SOVs, CaIn2S4, and BiOCl, which can effectively narrow the bandgap and accelerate the interfacial charge separation of CaIn2S4/BiOCl-SOVs heterojunctions. Subsequently, it significantly promotes the generation of superoxide radicals (O2−), hydroxyl radicals, and h+, which participate in the photodegradation process of phenol. The catalyst still maintained a relatively high activity after repeated tests as a demonstration of its photostability. This work successfully proposed an efficient method to design a new 2D/2D S-scheme heterostructure with SOVs as possible photocatalysts in the field of environmental remediation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2014
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IF 1.968
Shu-Mei Zhou,De-Kun Ma,Ping Cai,Wei Chen,Shao-Ming Huang
Photocatalysts with excellent photocatalytic reaction activity and ideal selectivity are highly desirable for pollutants clearance and purification of targeted organics from a mixture. Continued efforts toward the goal, we here present a facile hydrothermal route to synthesize TiO 2 /Bi-benzenedicarboxylate/BiOCl nanoparticles decorated ultrathin nanosheets with a thickness less than 5 nm on a large scale. The as-synthesized products showed excellent photocatalytic activities for the degradation of various dyes such as rhodamine B, eosin Y and methylene blue in aqueous solution under visible light irradiation. The photocatalytic activities of TiO 2 /Bi-benzenedicarboxylate/BiOCl nanocomposites for the degradation of rhodamine B and eosin Y could be adjusted through tuning the content of TiO 2 . With increasing the amount of TiO 2 , the composites showed declining photocatalytic activities in decomposing of rhodamine B while on the contrary they displayed enhanced photocatalytic activities in decomposing of eosin Y. Interestingly, TiO 2 /Bi-benzenedicarboxylate/BiOCl composite nanosheets showed obvious photocatalytic selectivity in a mixed dyes system. The photocatalytic reaction and selectivity mechanisms of the nanocomposites for the degradation of the dyes were discussed on the basis of experimental results. The current study not only develops a new methodology to synthesize ultrathin nanosheets but also provides a novel strategy to design composite photocatalysts with high reaction activity and good selectivity.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
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2022
·
IF 9.988
Xiaoqian Zhang,Zhipeng Wu,Yixiao Wu,Abdulmoseen Segun Giwa,Shaobin Huang,Lishan Niu
Environmental dissemination caused by widespread use of antibiotics has been regarded as a possible hazard to aquatic ecosystem and human health. The increasing misgivings make it imperative to develop a novel catalyst with remarkable visible-light-driven activity to remove antibiotics, especially for their simultaneous decontamination . Herein, C/BiOCl composites were successfully prepared by decorating BiOCl nanosheets on food wastes biochar (C) by a simple hydrolysis strategy. Not only the binary system of tetracycline antibiotics, but also the ternary mixture could be simultaneously photodegraded over 25% C/BiOCl within 15 min irradiation. The improved photocatalytic activities could be ascribed to the introduction of biochar, endowing increased surface area, enhanced separation of photo-generated charge carriers, and better light absorption . The as-prepared 25% C/BiOCl also demonstrated satisfactory stability and positive removal effect in actual water samples. The present work provides new insights into the development of biochar-based photocatalysts for simultaneous degradation of multiple antibiotics.
研究领域:
环境科学
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材料科学
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化学工程
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水处理
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DOI
PubMed
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 32
·e202401965
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IF 1.9
Xiulong Shi,Biyang Tuo,Shengqing Wang,Jianli Wang,Yaxin Deng,Xvjun Zhang
Graphical In this paper, heterojunction photocatalyst TiO 2 @BiOCl-BiOI was successfully synthesized by composite modification method combined with sol-gel method, and it was applied to the degradation of CR. Thanks to the heterostructure structure, TiO 2 @BiOCl-BiOI showed excellent photocatalytic performance for CR under simulated sunlight, with a removal rate of 96.45 %. After 5 times of recycling, the removal rate of CR by TiO 2 @BiOCl-BiOI is still higher than 87 %. Under the action of ⋅O − 2 , h + and ⋅O, CR is oxidized to H 2 O, CO 2 and other harmless substances. TiO 2 @BiOCl-BiOI heterostructure photocatalyst with high photocatalytic activity was prepared by the composite modification and sol-gel procedure. TiO 2 nanoparticles highly dispersed on the surface of TiO 2 @BiOCl-BiOI, which provides sufficient active sites for the photocatalytic degradation process. The photodegradation performance of the photocatalyst was evaluated by the removal rate of Congo Red. The researches showed that the degradation effect of TiO 2 @BiOCl-BiOI for Congo Red is significantly stronger than that of TiO 2 and BiOCl-BiOI, which is mainly due to the type-II heterojunction structure of TiO 2 @BiOCl-BiOI and its enhanced visible-light response. The experiments of free radical capture indicated that ⋅ and are the main active species in the photocatalytic degradation system. This study showed that TiO 2 @BiOCl-BiOI can almost completely degrade Congo Red under simulated sunlight, making it the harmless substances such as H 2 O and CO 2 .
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
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 45
·19014-19024
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IF 7.76
Lijie Bai,Wenya Jiang,Chunxiao Gao,Shuxian Zhong,Leihong Zhao,Zhengquan Li,Song Bai
The combination of upconversion nanocrystals with a wide-bandgap semiconductor is an efficient strategy to develop near-infrared (NIR)-responsive photocatalysts. The photocatalytic activity of the hybrid structures is greatly determined by the efficiency of the energy transfer on the interface between upconversion nanocrystals and the semiconductor. In this work, we demonstrate the interface design of a NaYF4:Yb,Tm–BiOCl hybrid structure based on the choice of suitable BiOCl facets in depositing NaYF4:Yb,Tm upconversion nanocrystals. It was found that the selective deposition of NaYF4:Yb,Tm nanocrystals on the BiOCl(110) facet can greatly enhance the photocatalytic performance in dye degradation compared with the sample with NaYF4:Yb,Tm nanocrystals loaded on the BiOCl(001) facet. Two effects were believed to contribute to this enhancement: (1) a stronger UV emission absorption ability of the BiOCl(110) facet from NaYF4:Yb,Tm in generating more photo-induced charge carriers resulted from the narrower bandgap; (2) a shorter diffusion distance of photogenerated charge carriers to the BiOCl(110) reactive facet for surface catalytic reactions owing to the spatial charge separation between different facets. This work highlights the rational interfacial design of an upconversion nanocrystal–semiconductor hybrid structure for enhanced energy transfer in photocatalysis.
研究领域:
材料科学
·
光催化
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产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2017
·Vol. 8
·期 1
·201-209
·
IF 5.773
Peiyuan Xiao,Jufeng Lou,Huixian Zhang,Weili Song,Xi-Lin Wu,Hongjun Lin,Jianrong Chen,Shoujie Liu,Xiangke Wang
Quantum dots (QDs) derived from two-dimensional (2D) nanosheets (NSs), especially ultrathin transition metal dichalcogenide (TMD, e.g. WS2, WSe2, MoS2, MoSe2) NSs, have attracted great attention due to their broad band absorption and high charge mobility. Herein, WS2 QDs, one of the emerging extraordinary zero-dimensional (0D) TMD materials, were applied to the preparation of novel 0D/2D heterojunctions of WS2 QDs/BiOCl nanosheets. The obtained WS2/BiOCl composites exhibited significantly enhanced visible-light-driven photocatalytic activity as compared with pure BiOCl. The results indicated that the holes (h+) and O2˙− are the main active species generated by the catalysts under visible light irradiation. The enhanced photocatalytic performance could be due to the broad band absorption and up-conversion properties of the WS2 QDs as well as the band alignment and the strong coupling between the WS2 QDs and BiOCl NSs, leading to a broadened light absorption range and enhanced efficiency for electron–hole pair production and separation. These findings offer exciting opportunities using the extraordinary 2D TMD material-derived quantum dots for the fabrication of novel 0D/2D composites and may provide new insights into the application of the novel 0D/2D composites in catalysis.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMOSPHERE
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2021
·
IF 7.086
Fuyou Du,Zhan Lai,Huiyang Tang,Haiyan Wang,Chenxi Zhao
In this work, a novel BiOCl/Cu-doped Bi 2 S 3 photocatalyst was designed to efficiently remove ciprofloxacin (CIP) with high photocatalytical activity and good stability over a wide pH range. Compared with Cu-doped Bi 2 S 3 , Bi 2 S 3 , BiOCl, BiOCl/Bi 2 S 3 , and Cu-doped BiOCl, the photocatalytical degradation rate of CIP (97.1% at 20 mg/L) over BiOCl/Cu-doped Bi 2 S 3 was enhanced by about 84.77, 44.23, 2.95, 2.27, and 1.96 times within 20 min, respectively. Notably, the BiOCl/Cu-doped Bi 2 S 3 photocatalyst also displayed high photocatalytical performance in the degradation of other antibiotics including norfloxacin, ofloxacin, and tetracycline (40 mL, 20 mg/L; 88.3%, 100%, and 95.2% of degradation rate within 30 min, respectively) under visible light irradiation. Radical trapping experiments and electron spin resonance technique indicated that superoxide radicals (•O 2 − ) and photogenerated holes (h + ) played crucial roles in the photocatalytic degradation of CIP. Finally, the possible CIP degradation pathways was proposed by detecting the CIP intermediates in photocatalytical reaction process.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
TALANTA
·
2018
·
IF 4.244
Zhiqing Yang,Yi Wang,Dun Zhang,Chao Chen
Using photoelectrochemical (PEC) platform for ultrasensitive detection of sulfate-reducing bacteria (SRB) is a big challenge since sensor sensitive component can be damaged by corrosive metabolites. In this work, a novel bio-etching strategy for sensitizing PEC platform is developed to detect SRB. In the presence of bacterial metabolite (H 2 S), BiOCl platform can be bio-etched to form Bi 2 S 3 /BiOCl p-n heterojunction, leading to a significant enhancement of photocurrent . The PEC sensing platform fabricated by bio-etching strategy presents acceptable detection specificity and high detection sensitivity with a low detection limit of 29 cfu/mL for SRB. The current work can provide new strategies to sensitize PEC platforms for detection of microorganisms that produce corrosive metabolite.
研究领域:
微生物学
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Xiaoya Gao,Qian Guo,Guangbei Tang,Wenjie Zhu,Xingxin Yang,Yongming Luo
Ultrathin nanosheets show great promise in photocatalytic technology, due to short path for electron transfer and large surface for reactant adsorption. However, there is no report that ultrathin nanosheets photocatalyst has been used to degrade carbamazepine (CBZ) in aquatic environment. This paper aimed at fabricating ultrathin BiOCl nanosheets to improve the photocatalytic degradation efficiency of CBZ. Herein, tetrabutylammonium hydroxide (TBAOH) was firstly applied to synthesize ultrathin BiOCl nanosheets (BiOCl-T) by a simple hydrolysis route in water at ambient conditions. TBAOH could act as a structure-directing agent, determining the structure and property of BiOCl-T. Assisted by TBAOH, BiOCl-T exhibited ultrathin nanosheets structure with preferential exposed (1 1 0) face. PL, photocurrent density, and EIS Nyquist plots demonstrated the enhanced charge separation efficiency in BiOCl-T. Furthermore, BiOCl-T displayed large pore size and specific surface area. Thus, BiOCl-T showed high photocatalytic activity toward CBZ degradation under simulated sunlight. Upon 30 min irradiation, the degradation efficiency of CBZ was 91.1% with fast degradation kinetics, which is 2.46 times higher than ordinary BiOCl. Active species of h + , O 2 − , and OH contributed to CBZ degradation reaction. The obtained result provides a novel viewpoint to fabricate ultrathin nanosheets and broadening their application in the degradation of recalcitrant pharmaceuticals.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
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