MATERIALS & DESIGN
·
2019
·
IF 5.77
Peng Xu,Jin Yang,Yu Chen,Yong Li,Xiaohua Jia,Haojie Song
The removal of emulsified oil and organic dyes from wastewater is of extreme challenge owing to their difference of physical and chemical properties. Here we choose cellulose fibers derived from wood as supporting materials and the irregular flake-like BiOBr and sphere-like AgBr are in situ grown on the fibers via freeze-drying, which successfully create wood-derived fiber/BiOBr/AgBr (WFBA) sponge for wastewater treatment. The obtained WFBA sponge reveals favorable mechanical strength at a strain of 60% and 50 cycles of compression tests. In view of the superhydrophilicity and underwater superoleophobicity of WFBA sponge, it can be used for separating surfactant-stabilized kerosene-in-water emulsions with oil rejection ration higher than 99.91%, and simultaneously adsorbing organic dyes with removal efficiency >99.99%. Furthermore, the polluted WFBA sponge is capable of realizing dye degradation under Xe lamp, solar light and fluorescent lamp due to its enhanced photocatalytic activity. Thus, the regenerated sponge can take full advantage of functionalities of emulsion separation and dye adsorption, as presented by that the oil rejection ration still keeps as high as 98.23% and removal dye efficiency remained over 99.90% after five cycles of filtration. This study provides a feasible and scalable approach to engineer versatile materials for wastewater treatment.
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 ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yashi Qing,Enming Huang,Lixia Cao,Haigang Gao,Shengyong Zhao,Yanxiang Li,Wangliang Li
The prevalence of 17β-estradiol (E2) in wastewater has attracted widespread attention due to the negative impacts on ecological environments and human health. Nowadays, photocatalysis has been emerged as an efficient technology for E2 containing wastewater treatment. However, traditional powder photocatalysts face challenges such as easy agglomeration, secondary pollution and difficult recovery, limiting their large-scale application. In this study, a photocatalytic PA/C-PANI@BiOBr membrane was fabricated by immobilizing polyaniline (PANI) layer and BiOBr nanosheets on polyamide (PA) membrane through in-situ chemical bath deposition. This process leveraged the strong hydrogen bond interaction between PANI and PA, with the fine PANI fibers providing nucleation sites for the in-situ growth of BiOBr nanosheets. By repeating the immersion process, we controlled variations in the coverage density and morphology of BiOBr on the membrane surface. The PA/C-PANI@BiOBr membrane exhibited outstanding light absorption and photocatalytic performance. Notably, the optimal PA/C-PANI@BiOBr-10 membrane achieved 100 % removal efficiency of 3 mg L −1 E2 within 40 min. In dynamic cyclic experiments, PA/C-PANI@BiOBr-10 membrane maintained stable permeability and high removal efficiency of pollutants. The photocatalytic mechanism underlying these results was elucidated through photoelectric testing and further photocatalytic experiments. Furthermore, the PA/C-PANI/BiOBr-10 membrane demonstrated remarkable durability over multiple consecutive cycles, with E2 removal efficiency remaining above 96.5 % after 5 cycles.
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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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 11
·6732-6744
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IF 4.22
You Junhua,Wang Lu,Bao Wanting,Yan Aiguo,Guo Rui
Abstract The visible-light-responsive composite photocatalyst is beneficial to improve the solar energy utilization efficiency through the coupling of narrow bandgap materials. In this work, CdS nanowires were prepared by hydrothermal method, and then BiOBr/CdS composite materials with different mass ratios were successfully prepared by a simple two-step sonography-precipitation method using CdS nanowires as a deposition template. The photocatalysts were characterized by XRD, SEM, XPS, TEM, and other methods. Rhodamine B (RhB) was used as a model pollutant to evaluate the photocatalytic activity of BiOBr/CdS catalysts with different mass ratios. The photocatalytic test results show that the composite photocatalyst containing 60% BiOBr has the highest photocatalytic activity, which indicates that it is related to the decrease in photogenerated charge recombination rate. Subsequently, the electrochemical and physical methods were used to illustrate the electron transfer mechanism and the main active center of the as-prepared samples. Free radical capture experiments reveal that holes are the main active species in the photocatalytic process of composite samples. Graphical abstract BiOBr/CdS composite photocatalyst was prepared by a simple precipitation method using dispersed one-dimensional CdS nanowires as a template. BiOBr/CdS heterostructure combined adsorption and catalysis to degrade RhB molecules more efficiently. Free radical trapping experiments reveal that holes are the main active species in the photocatalytic process of composite samples.
研究领域:
材料科学
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环境科学
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光电催化
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2018
·Vol. 8
·期 10
·2588-2597
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IF 5.365
Yuwei Mi,Haiping Li,Yongfang Zhang,Na Du,Wanguo Hou
Crystal facet engineering is one of the most important ways to enhance the photoactivity of photocatalysts, but it remains challenging so far. In addition, the effects of exposed facets and crystallite sizes on the photoactivity of BiOX (X = Cl, Br, or I) nanosheets have been widely investigated. However, it is still unclear which one between the exposed facets and the crystallite sizes is more important for the photoactivity of the BiOX nanosheets. In this work, a series of BiOBr nanosheets with tunable exposed facets and crystallite sizes were solvothermally synthesized in a mixed solvent of n-propanol, water, and acetic acid. The regulation of the exposed facets and crystallite sizes was achieved simply by changing the n-propanol/water volume ratios (Rp/w, 0/30 to 30/0) of the mixed solvent. At low n-propanol contents (Rp/w < 15/15), the obtained BiOBr nanosheets expose dominantly (001) facets, while at high n-propanol contents (Rp/w > 20/10), they expose dominantly (010) facets. With increasing Rp/w, the lateral size and thickness of the BiOBr nanosheets all decrease, from 1700 to 174 nm and from 156 to 17 nm, respectively. The effects of exposed facets and thicknesses of BiOBr nanosheets on the photocatalytic activity, evaluated by degradation of salicylic acid and rhodamine B under visible-light irradiation, were investigated. The exposed facet and thickness of BiOBr nanosheets are both important for their photocatalytic performance. The (001) facets exhibit a higher photocatalytic activity than the (010) facets. For the BiOBr nanosheets with the same (001) or (010) exposed facets, the photocatalytic activity increases with a decrease in their thickness. This study provides a new facile way to adjust the exposed facets and crystallite sizes of BiOX, and the findings may provide guidance for crystal facet engineering of other photocatalysts.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Zhijie Zhang,Liang Li,Ying Jiang,Jiayue Xu
Heterojunction manipulation has been deemed as a promising approach in exploring efficient photocatalysts for CO2 reduction. In this article, a novel step-scheme (S-scheme) photocatalyst of CsPbBr3 quantum dots/BiOBr nanosheets (CPB/BiOBr) was fabricated via a facile self-assembly process. The strong interaction, staggered energy band alignments, and much different Fermi levels between CsPbBr3 and BiOBr promised the formation of an S-scheme heterojunction. The resultant CPB/BiOBr heterojunction delivered remarkable photocatalytic performance in CO2 reduction, with an electron consumption rate of 72.3 μmol g–1 h–1, which was 4.1 and 5.7 times that of single CsPbBr3 and BiOBr, respectively. The superior photocatalytic performance originated from the impactful spatial separation of photoinduced electron–hole pairs, as well as the preservation of strongly reductive electrons for CO2 reduction. This work offers a rational strategy to design S-scheme heterojunctions based on lead halide perovskites, which are expected to have potential applications in the field of photocatalysis and solar energy utilization.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 16
·7256-7264
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IF 2.7
Hele Hua,Jing Yang,Rui Li,Yunfang Wang,Caimei Fan,Jianxin Liu,Yawen Wang
Resourceful utilization of coal gasification fine slag (CGFS), a typical coal-based solid waste, has always been a trial and challenge in solid waste treatment. In developing its utilization value, fewer steps and lower energy consumption during treatment are more favorable. Herein, CGFS was modified by combining BiOBr to develop its possible application in the photocatalytic degradation of organic pollutants. The BiOBr/CGFS photocatalysts were synthesized at ambient temperature by a simple hydrolysis method with zero pre-treatment of CGFS. The synthesized composites show improved effective photocatalytic performance in the degradation of organic pollutant and the BOB/CGFS20 showed the best activity, which can remove 89.3% of phenol within 90 minutes, 84.53% of sulfamethoxazole within 75 minutes and 84.96% of bisphenol A within 120 minutes. Moreover, the components in CGFS that may play a positive role were investigated and the results showed that CGFS acted as a carrier, and most likely, the carbon materials and metal oxides such as Fe2O3 and/or TiO2 in it led to the improvement of the quantum efficiency of BiOBr and further promoted the photocatalytic performance. This study aims to provide some references and inspiration for the utilization of CGFS and environmental protection.
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
CERAMICS INTERNATIONAL
·
2019
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IF 3.45
Haifen Xu,Zichen Xu,Jin Zhou,Ge Yan,Xiaowei Li,Shuping Zhuo
Novel magnetically separable BiOBr/magnetic reduced graphene oxide (BiOBr/MRGO) composite photocatalysts were fabricated using a one-step hydrothermal treatment . The photodegradation of RhB was choose as model reaction to evaluate the photocatalytic performance of as-prepared BiOBr/MRGO composites under visible light. The research results indicated that photocatalytic activities of all BiOBr/MRGO composites were markedly improved, compared to the single BiOBr. Among them, the BiOBr/MRGO hybrids with a MRGO mass ratio of 10% presented the highest photodegradation ability, and the kinetic constant of degradation was about 2 times higher than that of BiOBr. The enhancement of catalytic property was assigned to the increase of visible light absorption and the hindrance of photogenerated electron-hole pairs recombination originating from the introduction of MRGO. More importantly, BiOBr/MRGO exhibited excellent cycling stability after four cycles and could be easily separated by an external magnet and reused, which was convenient to the purification of organic pollutants.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
·
2024
·
IF 8.4
Huili Ran,Xue Liu,Jiajie Fan,Yun Yang,Lijie Zhang,Qin Guo,Bicheng Zhu,Quanlong Xu
The construction of heterojunction is an effective way to promote the photoinduced charge carrier separation in spatial, thus accelerating the photocatalytic reaction. However, the regulation of interface properties, as a crucial factor in affecting the charge carrier diffusion process, still remains a significant challenge. In this work, BiOBr/TpBD-COF heterojunction was successfully constructed via a novel phase transformation strategy. Specifically, perovskite Cs 3 Bi 2 Br 9 was first synthesized and then in-situ transformed into BiOBr during the preparation of TpBD-COF procedure, thus obtaining BiOBr/TpBD-COF heterojunction with favorable interface. According to the in-situ X-ray photoelectron spectroscopy (XPS) characterization and electron paramagnetic resonance (EPR) analysis, the photogenerated electrons with weak reduction power transfer from BiOBr to TpBD-COF driven by the internal electric field under irradiation, conforming S-scheme charge transfer mode. As a result, the photogenerated electrons and holes with strong redox abilities are spatially located on TpBD-COF and BiOBr surface, respectively, endowing the strong driving force toward the water splitting reaction. The optimized 10%BiOBr/TpBD-COF displayed remarkably enhanced photocatalytic hydrogen evolution rate (16.17 mmol·g −1 ·h −1 ) in comparison with TpBD-COF (5.18 mmol·g −1 ·h −1 ). This study will provide some novel inspirations for developing efficient COF-based S-scheme heterojunction photocatalysts.
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
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2025
·
IF 13.5
Xianghai Song,Xiaoying Liu,Zhixiang Ren,Xiang Liu,Mei Wang,Yuanfeng Wu,Weiqiang Zhou,Zhi Zhu,Pengwei Huo
Photocatalytic carbon dioxide (CO 2 ) reduction represents a hopeful approach to addressing global energy and environmental issues. The quest for catalysts that demonstrate both high activity and selectivity for CO 2 conversion has attracted significant attention. In this study, ultrathin N-doped BiOBr was synthesized using a simple straightforward method. Systematic experimental results indicated that N-doping reduced the thickness of the BiOBr nanosheets and increased their specific surface area. Moreover, the efficiency of photogenerated charge carrier migration and the CO 2 adsorption capacity were significantly enhanced, contributing to improved CO 2 photoreduction performance. Experimental results showed that the 2N-BiOBr exhibited the best catalytic performance, with a CO evolution rate of 18.28 μmol·g −1 ·h −1 and nearly 100% CO selectivity in water, which was three times higher than that of pure BiOBr. The potential photocatalytic mechanism was investigated using in situ FTIR analysis and DFT simulations. Mechanistic studies revealed that N atoms replaced O atoms as adsorption centers, enhancing the strong adsorption selectivity towards CO 2 over O–H in BiOBr and facilitating the formation of key reaction intermediates. This study provides new perspectives on the creation and developmen of effective photocatalytic materials, offering theoretical support for the application of photocatalytic technology in energy and environmental science.
研究领域:
材料科学
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环境科学
·
能源科学
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Cong Lu,Weidong Wu,Haifeng Zhou
A novel visible-light-driven BiOBr/BiFeWO 6 heterojunction was prepared through a simple hydrothermal route. The physicochemical properties of BiOBr/BiFeWO 6 nanocomposites were systematically characterized. The existence of a clear interface between BiOBr and BiFeWO 6 could be obtained by transmission electron microscopy , indicating the formation of heterojunction. Rhodamine B (RhB) was used to investigate the photocatalytic performance of BiOBr/BiFeWO 6 nanocomposites under visible light irradiation (λ > 420 nm). The degradation efficiency of BiOBr/BiFeWO 6 -40 nanocomposite reached 96.3 % within 90 min. The improved photocatalytic performance is mainly due to the synergistic interaction between BiOBr/BiFeWO 6 . It is beneficial to the separation of photogenerated carriers and the absorption of visible light. In addition, long-term stability results indicate that BiOBr/BiFeWO 6 heterojunction may be an excellent material for effective degradation of dyes from wastewater and may be explored for large-scale application in the future. Finally, a possible mechanism is proposed for the catalytic degradation of RhB by the BiOBr/BiFeWO 6 heterojunction. This work provides a convenient and dependable method to synthesize BiOBr/BiFeWO 6 nanocomposite, which might be a promising candidate for large-scale application in wastewater treatment.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Bo Ge,Xuewen Yang,Heyuan Li,Limin Zhao,Guina Ren,Xiao Miao,Xipeng Pu,Wenzhi Li
In order to solve the problem of pollutants remained in water after oil removal, the visible light responsive non-wetting BiOBr cotton fabrics were prepared through a simple immersion method. The material is not only able to separate the oil/water mixture efficiently, but also has the properties of visible light response degradation of water soluble pollutants. The degradation efficiency of water soluble methylene blue and rhodamine B were 98% and 97%, respectively. Then, the active species capture experiment demonstrated that O 2 − and h + play a major role in the photocatalytic process. Finally, the stability of the prepared superhydrophobic BiOBr cotton fabric was proven using friction test, ultrasonic treatment for a long time, immersion in different pH value solutions and 6 cycles of cycling degradation experiments. In this study, the superhydrophobic BiOBr cotton fabric with photocatalitic property may provide a new solution for the treatment of water resource.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Jing Xie,Jianguo Huang,Dilireba Turgan,Zhenjiang Lu,Jindou Hu,Yue Feng,Yali Cao
Constructing heterojunctions with strong interfacial interactions can accelerate the transfer and separation of photogenerated charge carriers. However, finding a simple strategy to construct tightly connected heterojunctions remains a major challenge. In this work, AgBr/BiOBr S-scheme heterojunctions were designed via a straightforward co-anionic strategy without using a solvent. The experimental results indicate that the AgBr/BiOBr heterojunction with a close contact interface can extend the use of visible light, accelerate the separation, and induce the transfer of photoelectrons and holes while maintaining an excellent redox capacity. Undoubtedly, the photocatalytic reduction rate of carbon dioxide to carbon monoxide by 1.0 AgBr/BiOBr is 87.73 μmol·g–1·h–1 (quantum efficiency is 0.57%), which is 12.15 times and 4.45 times higher than that of pure AgBr and BiOBr, respectively. The present work provides insights into a simple strategy for the preparation of strongly interacting interfacial heterojunctions for photocatalytic CO2 reduction.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）