CHEMOSPHERE
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2022
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IF 8.943
Congjie Liang,Jian Ma,Yixi Cao,Taisong Zhang,Chanyu Yang,Yingfeng Wu,Huaming Li,Hui Xu,Yingjie Hua,Chongtai Wang
Adsorption and its influence are often neglected during photocatalytic degradation of organic pollutants . To call attention to these issues, a novel bismuth oxybromide (BiOBr) microsphere with hierarchical flower-like structure was fabricated through a facile hydrothermal process using polyvinyl pyrrolidone (PVP) as additive in this work, and then the adsorption of the BiOBr microspheres to RhB and its influence on the photocatalytic degradation of RhB were investigated in detail. Experimental results show that the BiOBr microspheres have a very strong adsorption capacity to RhB. The adsorption behavior follows the Langmuir model and the quasi second order kinetic equation . Tests of the photocatalytic degradation of RhB under visible irradiation verify that the adsorption of the BiOBr microspheres to RhB greatly boosts the degradation of RhB due to the “enriching effect”, and a complete degradation of 20 mg L −1 RhB only requires 37 min.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
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2022
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IF 3.752
Peijie Weng,Qing Cai,Linfeng Zhang,Huadong Wu,Kun Wu,Jia Guo
In this study, the Mo -doped hollow hierarchical Bi/BiOBr microspheres are prepared by the solvothermal method with the Sn 2+ as reductant. The prepared composites show a good degradation effect for ciprofloxacin (CIP) under visible light. Especially, the BSM-22 composite show the best photocatalytic activity, with the apparent rate constant k as high as 0.03014 min −1 , which is 26.9 times that of the pure BiOBr. It is assumed that the introduction of Sn 2+ facilitate the formation of hollow hierarchical microspheres structure of BiOBr microspheres and the appearance of metallic Bi on the surfaces. Therefore, the transfer and separation efficiency of photogenerated charges is increased in the composites. Impressive, benefit from the microtopography of the hollow structure, the specific surface area of the BSM-22 (53.476 m 2 /g) is 21.76 times than that of the BiOBr (2.458 m 2 /g). The doping of Mo reduces the band gap of BiOBr (exactly from 2.61 to 1.96 eV) and broaden the photoabsorption region. Therefore, the photocatalytic activity of the Mo -doped Bi/BiOBr microspheres are heavily improved in dealing with different kinds of antibiotic molecules. More importantly, these results show that the design strategies of heteroatom doping, metal bismuth production, and morphology control of the bismuth oxybromide composite can greatly improve the visible-light catalytic activity.
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
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 27
·15310-15320
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IF 12.732
Jichao Zhang,Jun Song,Lifang Liu,Peng Zhang,Yang Si,Shichao Zhang,Jianyong Yu,Bin Ding
Water pollution caused by oil has placed a significant burden on the ecosystem and human health. However, the present membranes suffer from a serious oil fouling issue during long-term oily wastewater remediation, which has limited their practical applications. Herein, inspired by the taro leaf, we develop a biomimetic nanofibrous membrane composed of BiOBr microspheres anchored on electroconductive SiO2/polyaniline (PANI) core–shell nanofibers. Due to the surface multiscale structures and hydrophilic matrix, the biomimetic membrane shows intriguing superhydrophilicity, underwater superoleophobicity, and low-oil-adhesion. Benefitting from the high porosity and sub-micrometer pores, the membrane exhibited superior capability for separating highly emulsified oil-in-water emulsions with a promising permeation flux of 6140 L m−2 h−1 and a high separation efficiency (total organic carbon content <5 mg L−1). Importantly, the presence of BiOBr/PANI heterojunction arrays with visible light catalytic activity and 3D PANI electroconductive networks effectively imparts desirable self-cleaning properties, maintaining a high flux recovery ratio >98%. The synthesis of such biomimetic nanomaterials may open up new avenues for developing high-performance separation materials for the purification of large volumes of 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
Journal of Materials Chemistry A
·
2013
·Vol. 2
·期 8
·2599-2608
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IF 0
Xingqi Wang,Wenxia Liu,Jian Tian,Zhenhuan Zhao,Pin Hao,Xueliang Kang,Yuanhua Sang,Hong Liu
Uniform well-defined nanostructured BiOBr microspheres have been fabricated via a simple hydrothermal method in the presence of cetyltrimethylammonium bromide (CTAB) and ethylene glycol (EG). The heavy metal ion adsorption on the as-synthesized nanostructured BiOBr microspheres was systematically assessed by measuring the residual concentration during the adsorption process using a colorimetric method for Cr(VI) concentration, and an extraction-colorimetric method for Cd(II) and Pb(II) concentrations. The nanostructured BiOBr microspheres showed good removal capacity for heavy metal ions (Cr, Cd, Pb), and excellent adsorption properties for low concentration heavy metal ions, indicating potential applications in water purification. Based on the quick and efficient heavy metal ion removal ability of nanostructured BiOBr microspheres, a continuous filtering-type water purification device was designed and constructed. In using this continuous filtering type water purification device, 1 g of adsorbent can purify about 4900 g of Pb(II) contaminated water, 5900 g of Cd(II) contaminated water, or 21 500 g of Cr(VI) contaminated water having initial concentrations of 200 μg L−1 to successfully attain the World Health Organization standard for drinking water. The good removal capacity can be attributed to the hierarchical nanostructure, which displays a large specific surface area and strong adsorption of heavy metal ions.
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
ELECTROCHIMICA ACTA
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2020
·
IF 6.215
Zheng Zhang,Haifei Zhou,Caiyun Jiang,Yuping Wang
In this study, an ultrasensitive photoelectrochemical (PEC) sensor showing a high selectivity to for chloramphenicol (CAP) was successfully constructed, based on the molecularly imprinted polymers (MIPs) functionalized photoelectrochemically active materials. The 3D flower-like BiOBr with large specific surface area was synthesized by a simple hydrothermal process and was employed as a matrix to graft the MIPs recognition element (denoted as MIPs-PEC). SEM, TEM, FTIR, XPS, XRD and UV–vis spectroscopy were used to investigate the microstructure characteristics of the as-obtained MIPs-PEC sensor. During the PEC sensing process, MIPs were prepared via a simple thermal polymerization process provided numerous recognition sites, which improved the sensor’s selectivity to CAP. The results showed that photocurrent response signal generated by photo-induced MIPs/BrOBr/ITO electrodes was proportional to the logarithm of CAP concentration over the range from 1.00 ⅹ 10 −2 to 1.00 ⅹ 10 3 ng mL −1 with a low detection limit is 3.02 pg mL −1 (S/N = 3). MIPs-PEC sensor exhibited high selectivity and stability, low cost, and applicability to the determination of CAP in real samples.
研究领域:
分析化学
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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
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 35
·16522-16532
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IF 3.553
Wei Zhiping,Dong Xiaoli,Zheng Nan,Wang Yu,Zhang Xiufang,Ma Hongchao
A series of niobium-doped BiOBr (Nb-BiOBr) were successfully synthesized via hydrothermal method. Moreover, the morphology structure and optical property of BiOBr and Nb-BiOBr samples were determined using various characterization techniques including SEM, TEM, EDS, BET, XRD, XPS and DRS, etc. The photocatalytic performance of Nb-BiOBr was deeply investigated with the rhodamine B and ofloxacin degradation under visible-light irradiation as model reaction. The results showed that Nb-BiOBr samples depicted the outstanding photocatalytic performance, especially for the 1.25Nb-BiOBr. Moreover, its reaction kinetic constant was ca. 6.4 times higher than that of undoped BiOBr. The observed photocatalytic performance could be attributed to the strong light absorption, enhanced separation efficiency of charge carriers as well as high specific surface area. Meanwhile, 1.25Nb-BiOBr demonstrated stability in RhB degradation, thereby facilitating the water treatment application.
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
Catalysts
·
2023
·Vol. 13
·期 6
·958
·
IF 3.9
Zhigang Wang,Cheng Liu,Fengxi Chen,Rong Chen
Semiconductor photocatalytic performances can be modulated through morphology modification. Herein porous hierarchical BiOBr microspheres (BiOBr-MS) of ~3 μm was firstly self-assembled without the assistance of a template via a facile solvothermal synthesis in triethylene glycol (TEG) at 150 °C for 3 h. KBrO3was exploited as a bromine source, which slowly provided bromide ions upon reduction in TEG and controlled the growth and self-assembly of primary BiOBr nanoplates. The addition of PVP during solvothermal synthesis of BiOBr-MS reduced the particle size by about three-fold to generate BiOBr sub-microspheres (BiOBr-sMS) of <1 μm. BiOBr-sMS exhibited significantly higher photocatalytic activity than BiOBr-MS for aerobic photooxidation of benzyl alcohol (BzOH) to benzaldehyde (BzH) under simulated sunlight irradiation (conversions of BzOH (50 mM) over BiOBr-sMS and BiOBr-MS were, respectively, 51.3% and 29.6% with 100% selectivity to BzH after Xenon illumination for 2 h at 25 °C). The photogenerated holes and ·O2−were found to be main reactive species for the BzOH oxidation over BiOBr spheres by scavenging tests and spin-trapping EPR spectra. The higher photocatalytic activity of BiOBr-sMS was attributed to its more open hierarchical structure, efficient charge separation, more negative conduction-band position and the generation of larger amounts of ·O2−.Keywords:BiOBr spheres;hierarchical nanostructures;photocatalysis;benzaldehyde
研究领域:
材料科学
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化学工程
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环境科学
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光化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）