OPTICAL MATERIALS
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2024
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IF 3.8
Xiao-shan Miao,Jia-wei Sun,Fu Ma,Hong-jian Zhao,Yan Zhou,Zheng-bing Han,Xu Li
Zn–SnO 2 /BiOBr, a novel heterojunction material for photocatalytic dye degradation, was synthesized successfully using the one-step hydrothermal method. The formation of the heterojunction enhanced the vacancy coupling effect. The photocatalytic experiment results showed that the degradation rate of Rhodamine B (RhB) due to 0.3Zn–SnO 2 /BiOBr (the heterojunction formed when the molar ratio of Zn–SnO 2 to BiOBr was 0.3) within 15 min was 9.27 and 476.9 times that of BiOBr and Zn–SnO 2 , respectively. Additionally, the degradation rate of basic fuchsin (BF) due to 0.3Zn–SnO 2 /BiOBr was 4.2 and 21.9 times that of BiOBr and Zn–SnO 2 , respectively. The significantly improved photocatalytic performance was because many oxygen vacancies in Zn–SnO 2 /BiOBr collaborated with the type-II heterojunction to promote a narrow bandgap value efficiently, increasing the photogenerated electrons (e – ) and hole (h + ), an increased charge separation efficiency under visible light, and favored the photocatalytic degradation of dyes.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2020
·Vol. 37
·期 1
·64-77
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IF 1.681
Yuxiang Yan,Hua Yang,Zao Yi,Xiangxian Wang,Ruishan Li,Tao Xian
In this work, we have adopted a coprecipitation method to synthesize BiOBr nanoplates with diameter of 150–450 nm and thickness of 40–80 nm, and then created Bi nanowires (diameter: 6 nm) on their surface through a NaBH4 reduction method. Evolution of Bi nanowires was systematically investigated by varying the concentration of NaBH4 solution and reaction time. It is demonstrated that with increasing the NaBH4 concentration (2 h reaction), Bi nanowires are gradually evolved from BiOBr crystals, and in particular treatment by 110 mM NaBH4 solution leads to the complete evolution of BiOBr nanoplates to Bi nanowires. At a low-concentration NaBH4 solution (30 mM), BiOBr crystals are partially reduced to Bi nanowires with increasing reaction time, and then the Bi nanowires are recrystallized into BiOBr nanowires/nanoparticles on the surface of BiOBr nanoplates. At a high-concentration NaBH4 solution (110 mM), BiOBr nanoplates are easily reduced to Bi nanowires with a short reaction time, and further prolonging the reaction time leads to the gradual transformation of Bi nanowires into Bi4O5Br2 nanoparticles/nanowires. Photocatalytic performances of the samples were evaluated by eliminating rhodamine B from aqueous solution under simulated sunlight illumination. It is demonstrated that the creation of Bi nanowires (an appropriate content) on the surface of BiOBr nanoplates can produce excellent Bi@BiOBr composite photocatalysts with enhanced photodegradation performances. The underlying enhanced photocatalytic mechanism was investigated and discussed.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Qianqian Ni,Xin Ke,Wenjing Qian,Zheng Yan,Jingde Luan,Wengang Liu
A single hydrothermal reaction was used to create BiOI/BiOBr composites, which demonstrated good sunlight-driven photocatalytic degradation activity of tetracycline (TC) over a broad pH range and the degradation efficiency can be stable at about 90%. Moreover,·O 2 - has been identified as the most important active ingredient in the photocatalytic system. Density functional theory (DFT) calculations were used to investigate the electron transfer mechanism of BiOX heterojunctions on a molecular scale, as well as to propose possible photocatalytic degradation mechanisms and reaction sites for tetracycline in different deprotonated forms at a wide range of pH values. The quantitative structure-activity relationship (QSAR) was also used to assess the toxicity of the intermediates. In summary, this study presents new concepts for investigating the photodegradation behavior of antibiotics throughout a wide pH range, which is predicted to be employed for surface water remediation.
研究领域:
环境科学
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材料科学
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计算化学
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DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2024
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IF 4.3
Jin Chen,Suqing Qin,Xiaofeng Yang,Yueying Wang,Tai Yang,Meidan Que,Yuzhao Ma,Yanjun Li
BiOBr can effectively mitigate the ecological and environmental problems caused by pollution with antibiotics, and its photocatalytic properties can be improved by utilizing heterojunction structures and cocatalysts. In this study, the Z-scheme heterojunction ternary photocatalyst BiOBr/g-C 3 N 4 /CQDs (BCC x ) was obtained by using an uncomplicated electrostatic self-assembly process. The incorporation of carbon quantum dots (CQDs) with high conductivity provided a conduit for charge transfer between g-C 3 N 4 and BiOBr. The loading density of CQDs on BiOBr/g-C 3 N 4 could be rapidly adjusted by changing the concentration of the CQDs precursor in solution. The presence of CQDs enhanced the absorption of visible light and inhibited the synthesis of photogenerated charge carriers, thereby resulting in a synergistic effect on the Z-scheme heterojunction and improving the photocatalytic properties under visible light. In particular, BCC50 had the highest catalytic performance, with a tetracycline pollutant degradation efficiency of 100% within 60 min. The degradation efficiency remained above 95% even after repeated use in five cycles. The principles of semiconductor energy bands and internal electrostatic field generation are applied to explain the photocatalytic mechanism responsible for tetracycline degradation using BiOBr/g-C 3 N 4 /CQDs.
研究领域:
环境科学
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材料科学
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光催化技术
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DOI
高影响因子
OPTICAL MATERIALS
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2022
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IF 3.754
Jinfen Niu,Kai Wang,Lan Yang,Jiahui Shi,Yue Zhang,Fan Yang,Xiaojiao Yu,Binghua Yao
Photocatalysis can be a potential technique for decomposing antibiotics contaminants from water. In this study, g-C 3 N 4 modified Bi/BiOBr nanosphere were prepared by a simple microwave solvothermal method, and the structure-properties relationships of the Z-scheme heterojunction were evaluated in degrading organic dyes. Various characterization techniques were then applied to elucidate the structure-performance relationships of the resulting heterojunction photocatalysts in degrading CIP. Compared with pristine g-C 3 N 4 or Bi/BiOBr, the g-C 3 N 4 @Bi/BiOBr nanocomposites showed heightened property in photocatalytic degradation of CIP. The photocatalytic efficiency of CIP decomposition over the Z-scheme of g-C 3 N 4 @Bi/BiOBr heterojunction was about 2.38 and 1.35 times homologous to those of original g-C 3 N 4 and Bi/BiOBr. The enhancement in photocatalytic activity of g-C 3 N 4 @Bi/BiOBr could be described by the Z-scheme pathway and the SPR effect of Bi 0 , which broadened visible light absorption and promoted the separation of photoinduced carriers. In addition, the effect of typical water matrix factors, such as pH, anionic, and cationic on photodegradation rate were evaluated. Furthermore, results of scavenging experiments showed that ·OH, ·O 2 − , and h + all participate in the degradation of CIP. Based on the band structure and scavenging measurements, a possible photocatalytic mechanism for the as-synthesized g-C 3 N 4 @Bi/BiOBr composites was proposed.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Junfeng Chen,Ying zhang,XiaoJuan Li,Yanan Wang,Chang Ma,Minghui Guo
Photocatalytic degradation of organic pollutants is a widely used technology. Constructing oxygen vacancies , compounding other materials, and adjusting semiconductor morphology are effective ways to promote the performance of photocatalysis . In this study, ultrathin NCDs/BiOBr nanosheets with excellent photocatalytic ability were prepared. The triple role of NCDs in NCDs/BiOBr synthesis was revealed: controlling the thickness of the nanosheets , increasing the oxygen vacancy concentration, and regulating the band gap structure. Rhodamine B and tetracycline were degraded by the samples in visible light to examine their photocatalytic properties. The samples with the highest electron transfer efficiency were verified by optical and electrochemical characterization. As-synthesized NCDs/BiOBr catalysts exhibited good degradation in different water samples，indicating the ability of the samples for practical applications. In addition, the intermediates and possible degradation pathways of the prepared catalysts for the degradation of TC processes were also analyzed in depth. The electron transfer pathway and photocatalytic mechanism of NCDs/BiOBr were proposed in combination with free radical detection and energy band calculation.
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
Molecular Catalysis
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2017
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IF 0
Junlei Zhang,Zhen Ma
Ag 3 VO 4 /BiOBr n-p heterojunctions were prepared via chemical deposition. Ag 3 VO 4 /BiOBr consists of Ag 3 VO 4 nanoparticles with sizes ranging from several to tens nanometers and flower-like BiOBr microspheres composed of irregular nanosheets. The photocatalytic performance of Ag 3 VO 4 /BiOBr and relevant samples was investigated in the visible-light-driven degradation of Rhodamine B (RhB), methylene blue (MB), methyl orange (MO), and tetracycline hydrochloride (TC). Ag 3 VO 4 /BiOBr heterojunction with a BiOBr/Ag 3 VO 4 mass ratio of 10% was more active than a physical mixture of Ag 3 VO 4 and BiOBr, showing the importance of forming the heterojunction. Photogenerated holes (h + ) and superoxide radical anions ( O 2 − ) were found to be the primary active species. A possible mechanism for the enhanced photocatalytic performance was proposed.
研究领域:
材料科学
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环境科学
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DOI
Environmental Science-Nano
·
2018
·Vol. 5
·期 11
·2631-2640
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IF 6.087
Yuting Cai,Jun Song,Xiaoyan Liu,Xia Yin,Xiaoran Li,Jianyong Yu,Bin Ding
TiO2-based heterojunction fibrous membranes with stable hierarchical nanostructures, excellent visible-light-driven photocatalytic activity, and easy-recycling ability would hold great promise in environmental remediation; however, it still remains a great challenge to construct such fantastic fibrous membranes. Herein, soft and hierarchical heterostructured BiOBr-anchored TiO2 nanofibrous membranes (BiOBr@TiO2 NFM) were fabricated by the sol–gel electrospinning technique combined with a facile successive ionic layer adsorption and reaction (SILAR) process. The well-crystallized BiOBr nanoplates with lamellar structure were uniformly grown onto TiO2 nanofibers, and the size and amount of BiOBr nanostructures could be finely regulated through rationally adjusting the growth cycles of SILAR. Benefiting from the large surface area, enhanced visible-light response, and intimately connected interfacial heterojunctions, the resultant membranes exhibited superior photocatalytic performance for rhodamine B (RhB) degradation under visible light irradiation, including a high degradation efficiency of 95.5% within 120 min and excellent reusability in 5 cycles. More importantly, the membranes still maintained good mechanical flexibility and structural integrity after utilization and could be directly extracted from solution. This study may provide a new strategy for the design and fabrication of soft hierarchical nanostructured TiO2-based fibrous membranes for environmental remediation and other potential applications.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Yongqiang Zheng,Mingxuan Sun,Wangbing Sun,Xianglong Meng,Xiangzhi Huang,Ziyang Li
In this study, a facile in-situ sonochemical synthesis process is developed to construct nitrogen-doped graphyne/BiOBr composites. Multiple techniques are implemented to characterize the structures, morphologies, electronic and optical properties, and photocatalytic activity of the as-prepared samples, including X-ray powder diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, Raman, and X-ray photoelectron spectroscopy, etc. The results indicate that the wrinkle-like layer structure of N-graphyne enwinds around the sheet structure of BiOBr. Compared to pristine BiOBr, N-graphyne/BiOBr composites present superior visible-light response, higher specific surface area, and more significant separation of photoinduced charge carriers verified by Brunauer-Emmett-Teller, UV–vis absorption spectroscopy, instantaneous photocurrent, electrochemical impedance spectroscopy, and photoluminescence, thus presenting more pronounced visible-light photocatalytic properties on N 2 fixation and decomposition of pollutants. The optimal ratio of N-graphyne in N-graphyne/BiOBr composites is screened out for the photocatalytic decomposition of rhodamine B, levofloxacin, methylene blue, and nitrogen fixation under visible light illumination. Furthermore, the main active species are demonstrated as hole and O 2 – during photocatalytic degradation and the stable performance of is also observed for N-graphyne/BiOBr composites. The present research demonstrates that N-graphyne embellishment is an effective strategy to enhance the photocatalytic efficiency of BiOBr, which can be broadened as an excellent co-catalyst for decoration of other semiconductors.
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
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
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IF 4.6
Kai Li,Xijie Dong,Keliang Pan,Hang Zhang,Jian Yang
Constructing tightly bound and highly dispersed heterointerfaces through epitaxial growth is a promising strategy for enhancing the photocatalytic performance of composite systems. In this study, a three-dimensional (3D) hierarchical flower-like BiOBr/Bi 2 S 3 heterojunction was fabricated via an acid vapor ion exchange method. The highly matched lattice parameters facilitated the transformation of the BiOBr substrate into Bi 2 S 3 through epitaxial growth, while the relatively mild reaction conditions at the gas-solid interface effectively preserved the initial morphological structure of the substrate. Benefiting from the expanded spectral response range, enhanced separation and migration efficiency of photogenerated carriers, and improved light utilization through complex scattering within the hierarchical structures, the BiOBr/Bi 2 S 3 heterojunctions demonstrated exceptional photocatalytic activity in the degradation of Rhodamine B and Tetracycline Hydrochloride, as well as in the reduction of Cr(VI). This strategy not only provides a novel approach for the construction of topological heterojunctions but also holds significant potential as a universal methodology, offering broad prospects for both research and practical applications.
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
Journal of Environmental Sciences
·
2025
·
IF 6.3
Rong Wang,Weikun Zhu,Jiayi Hu,Siyang Liao,Cheng Chen,Baihang Chen,Shaobin Huang,Jiangyao Chen
Bismuth-based photocatalyst has garnered significant attention for degrading dyes and antibiotics in wastewater. However, their photocatalytic performance remains limited due to the high recombination rate of photoinduced carriers. Constructing a bismuth-based photocatalyst with high-efficiency and rapid degradation performance is crucial for its practical application. In this study, BiOBr nanosheets, with an ultra-thin structure and abundant (001) facet exposure, exhibiting stable photoelectric conversion ability, were successfully synthesized through a simply solvothermal method. Under simulated solar light irradiation, the catalyst achieved 100 % degradation of rhodamine B within 5 min and 97.6 % degradation of tetracycline within 30 min, while over 90 % degradation efficiency after 5 cycles was preserved, demonstrating high, rapid and stable performance of the catalyst. Moreover, 90.7 % and 44.5 % of removal and mineralization efficiencies for TC within 30 min were observed under natural sunlight irradiation. Superoxide radicals and photo-generated holes were the primary species responsible for the degradation of pollutants and the former contributed more effect in long reaction time. Finally, a possible photocatalytic oxidation pathway of tetracycline was proposed based on identified five main intermediates. The BiOBr nanosheets catalyst exhibits great potential for industrial applications in the elimination of hazardous and difficult-to-degrade organic pollutants in wastewater.
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
CHEMICAL PHYSICS LETTERS
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2022
·
IF 2.719
Min Wang,Beiyang Guo,Jiayu Zhan,Yuan Zhuang,Sridhar Komarneni,Jianfeng Ma
Mo-doped BiOBr nanoflowers were prepared by hydrothermal method with various Bi:Mo molar ratios, and their degradation efficiency of tetracycline under visible light was investigated using K 2 S 2 O 8 activation. Among the above series of catalysts, the sample containing 2% Mo dopant exhibited the optimum photocatalytic activity, which could efficiently remove tetracycline (TC) within 40 min. The mechanism of photocatalytic activity can be well explained by the generation of superoxide radicals (O 2 − ), sulfate radicals (SO 4 − ), hydroxyl radicals ( OH) and holes (h + ), which are responsible for the degradation of TC. In addition, the 2 %Mo-BiOBr catalyst has good recycling stability.
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
危险品化学品经营许可证（带存储）