NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 48
·期 5
·1998-2007
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IF 3.3
Li Feng,Hanping Fu,Tianxiang Zhang,Qing Zhang,Shufen Ren,Jiayun Cheng,Qingshuang Liang,Xiufeng Xiao
The surface properties of a photocatalyst play a pivotal role in maximizing the H2O2 generation efficiency of the photocatalyst system, especially in spurring the surface catalytic reactions and inhibiting the decomposition of H2O2. Herein, a series of Bi/BiOBr-X (X = 1, 2, and 3) photocatalysts co-modified with metal Bi and oxygen vacancies were obtained by a one-step solvothermal method using mannitol as a solvent and a reducing agent. Both Bi modification and the introduction of OVs have important influence on extending the light absorption range, enhancing charge carrier separation and suppressing the recombination of charge carriers as confirmed by UV-vis DRS, EIS, and PL characterization. Besides, the introduction of OVs can lead to an upward shift of CB minimum, which results in a stronger reduction ability of the photogenerated electrons, facilitating the reaction of the photogenerated electrons with molecular oxygen to produce superoxide ions. Meanwhile, the deposition of Bi nanoparticles on the surface of BiOBr nanosheets can significantly inhibit the decomposition of H2O2. Benefiting from the synergetic effect of Bi modification and the introduction of OVs, the as-prepared photocatalysts showed enhanced H2O2 production activity as high as 100.9 mM h−1 g−1. The present work not only marks a significant advancement in photocatalytic H2O2 production technology, but also provides a feasible idea and strategy for photocatalytic production of clean and renewable energy.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
Small
·
2022
·Vol. 19
·期 7
·2206407
·
IF 15.153
Mingfei Yu,Yueling Chen,Ming Gao,Guocheng Huang,Qiaoshan Chen,Jinhong Bi
Seeking highly-efficient, non-pollutant, and chemically robust photocatalysts for visible-light-driven ammonia production still remained challenging, especially in pure water. The key bottle-necks closely correlate to the nitrogen activation, water oxidization, and hydrogen evolution reaction (HER) processes. In this study, a novel Bi decorated imine-linked COF-TaTp (Bi/COF-TaTp) through N–Bi–O coordination is reasonably designed to achieve a boosting solar-to-ammonia conversion of 61 µmol −1 g −1 h −1 in the sacrificial-free system. On basis of serial characterizations and DFT calculations, the incorporated Bi is conducive to the acceleration of charge carriers transfer and N 2 activation through the donation and back-donation mode. The N 2 adsorption energy of 5% Bi/COF-TaTp is calculated to be −0.19 eV in comparison with −0.09 eV of the pure COF-TaTp and the electron exchange between N 2 and the modified catalyst is much more intensive. Moreover, the accompanied hydrogen production process is effectively inhibited by Bi modification, demonstrated by the higher energy barrier for HER over Bi/COF-TaTp (2.62 eV) than the pure COF-TaTp (2.31 eV) when using H binding free energy (Δ G H* ) as a descriptor. This work supplies novel insights for the design of photocatalysts for N 2 reduction and intensifies the understanding of N 2 adsorption and activation over covalent organic frameworks-based materials.
研究领域:
材料科学
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化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Guangfu Yi,Ke Zhang,Sha Kang
The construction of hybrid catalysts is an effective method to enhance catalytic performance, but research on the positioning of the load is limited. In this study, we synthesized two photocatalytic materials by controlling the bismuth-titanium ratio and the site value of Bi modification in the catalyst. The surface-modified photocatalyst, namely 1:0.9 Bi/TiO 2 , exhibits a photocatalytic efficiency of 68.9 % for the abatement of ppb-level NO in the presence of visible irradiation. This efficiency was significantly superior to that of the corresponding one-step synthesized Bi/TiO 2 (48.7 %) and the TiO 2 (18.6 %). Furthermore, it promotes nitrate formation and suppresses the generation of toxic NO 2 . Capture experiments indicate that the same active species are involved in both surface-loaded and uniformly loaded catalysts. The differences in their performance can be attributed to the higher vacancy concentration in the surface-loaded catalysts and the different local coordination environments of vacancies in the catalysts, altering the adsorption capability of oxygen molecules. This work offers fresh perspectives for the generation of efficient photocatalysts.
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
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Ke Zhang,Danqing Li,Qingyun Tian,Hongyang Cao,Farid Orudzhev,Irina A. Zvereva,Jingkun Xu,Chuanyi Wang
Practical application of photocatalysis is often challenged by some intrinsic issues such as recombination of photogenerated charge carriers, stability and separation, etc. Herein, bismuth decorated 0D/2D ZnFe 2 O 4 /Bi 5 FeTi 3 O 15 (Bi/ZF/BFT) step-scheme (S-scheme) heterojunction was fabricated by an in-situ method. Due to the advantages of structure and composition, the Bi/ZF/BFT with the desired proportion (Bi/ZF/BFT-35) exhibits favorable photocatalytic performance towards tetracycline (TC) degradation. Compared with the pure ZF, the nanohybrid shows superior stability after 5 times cycle tests. Moreover, Bi/ZF/BFT-35 is convenient to be separated from the reaction system due to its magnetic nature. As identified by ESR measurement, •O 2 − and •OH radicals were involved in the photodegradation of TC, which supports that the S-scheme is successfully prepared. Also, the Bi/ZF/BFT-35 shows great ability of chemical oxygen demand (COD) removal in the practical wastewater as well. Importantly, antibacterial activity against E. coli test indicates that photodegraded TC has lower biotoxicity. The present work demonstrates that cocatalyst Bi modified ZF/BFT S-scheme can not only significantly improve its stability with good recyclability from the reaction system, but also inhibits the recombination of charge carriers, giving insight on the strategy of fabricating a promising photocatalyst for practical 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
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Qing Hua,Lei Cheng,Wenqiang Qu,Da Wu,Yuehua Li,Zixiang Xu,Xi Cao,Ming Xie,Xiaodong Yan,Chunwei Dong,Dengsong Zhang
The reactive oxygen species (ROS) are of paramount importance for indoor volatile organic compounds removal through photocatalytic technology. However, generating abundant ROS under visible light remains challenging, resulting in the poor photocatalytic performance. Herein, we report a bismuth-modified tungsten oxide (WO 3 -Bi) photocatalyst with enhanced performance in the visible-light-driven degradation of acetaldehyde, a major indoor air pollutant. Bismuth atoms are atomically doped onto WO 3 surface, in which the strong Bi-O adsorption strength facilitates the water and oxygen adsorption to provide abundant ROS. Mechanistic investigations reveal that the photocatalytic oxidation of acetaldehyde involves the C-C breaking of acetic acid into methanol, followed by the complete elimination. These results demonstrate that the surface modification in photocatalyst plays a pivotal role in improving ROS generation and photocatalytic performance, offering a robust and sustainable solution for indoor air purification under visible light.
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
RSC Advances
·
2020
·Vol. 10
·期 24
·14360-14367
·
IF 3.119
Trinh Dinh Dinh,Dongxiang Zhang,Vu Ngoc Tuan
The effective adsorption of radioactive iodine is greatly desirable, but is still a significant challenge. In this manuscript, we report the synthesis of a bismuth-modified zinc aluminium layered double hydroxide (BiZnAl-LDH) via a co-precipitation method for the highly efficient absorption of iodine. Based on the robust chemical attraction between Bi and I2, BiZnAl-LDH exhibited highly effective iodine capture. Furthermore, to evaluate BiZnAl-LDH as an effective sorbent, it was characterized via X-ray powder diffraction (XRD), scanning electron microscopy-energy dispersion spectroscopy (SEM-EDS), and Fourier-transform infrared spectroscopy (FITR). In addition, to determine the morphology and iodine adsorption properties of BiZnAl-LDH, several studies were conducted. Through experiments, its elemental composition and vibration before and after iodine adsorption were analyzed via EDS and X-ray photoelectron spectroscopy (XPS). During the capture process, I2 is reduced to I− by the intercalated Bi3+ via chemical adsorption, and the maximum adsorption capacity of BiZnAl-LDH for iodine reached up to 433 mg g−1, which had a surface area, average pore diameter, and pore volume of 36.259 m2 g−1, 2.374 nm, and 0.128 m3 g−1, respectively. Compared with several previous sorbents for iodine adsorption, BiZnAl-LDH exhibited an iodine adsorption of approximately two times that of the commercial Ag-exchange zeolite X, and furthermore BiZnAl-LDH is cost-effective. Thus, the substantial iodine capture by BiZnAl-LDH indicates that it is a capable sorbent for the effective elimination of radioactive iodine from reprocessing plant emissions.
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
NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 46
·期 2
·798-807
·
IF 3.591
Jumeng Wei,Hao Wang,Chengyuan Kang,Xiangju Ye,Yuchen Wu,Bitao Liu,Changchun Song
Bismuth vanadate (BiVO4) is a promising photocatalytic material for use in environmental protection and water splitting. However, its short photogenerated carrier lifetime and narrow visible-light response restrict its extensive application. Herein, a novel electrospinning method was developed to prepare bismuth (Bi)-modified BiVO4 (Bi/BiVO4) porous nanofibers. The morphologies, structures, and chemical states of the obtained samples were characterized using a series of analytical techniques. The photocatalytic performance of the Bi/BiVO4 porous nanofibers was evaluated via the photocatalytic degradation of methylene blue (MB) under visible-light irradiation. The enhanced visible-light photocatalytic activity of Bi/BiVO4 can be attributed to the Bi nanoparticles, which exhibit a surface plasmon resonance (SPR) effect and have semiconductor character, extending the optical absorption of BiVO4 and restraining the recombination of electron–hole pairs during the photocatalytic degradation process, respectively. In this work, new insight is provided into the fabrication of a Bi/BiVO4 composite, which can act as an outstanding visible-light responsive photocatalyst, facilitating its application in the field of environmental protection.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
高影响因子
ELECTROCHIMICA ACTA
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2017
·
IF 4.798
Huan Zhang,Yi Tan,Jiayan Li,Bing Xue
The performances of rayon (RGF) and polyacrylonitrile (PGF) based graphite felts as electrodes are compared in the iron-chromium redox flow battery (ICRFB). The essential differences in structure between RGF and PGF are also characterized in this study. The results show that the RGF electrode displays excellent electrochemical performance for negative redox couple (Cr 3+ /Cr 2+ ), resulting in the cell with higher charge efficiency and slower capacity decay. However, due to the high degree of graphitization and electrochemical activity for positive redox couple (Fe 2+ /Fe 3+ ) in PGF, the cell using PGF has higher voltage efficiency and energy efficiency, as well as lower area surface resistance than the cell with RGF. The fundamental difference between RGF and PGF is the crystallites structure in radial direction and basal plane of the fiber. PGF with the core-rim structure has better graphitization stacked in radial direction of the fiber. Further, PGF has more defective carbons exposed in the basal planes, while the surface of RGF exhibits a higher concentration of oxygen functional groups. The role of catalysts in the ICRFB has also been studied by introducing bismuth (Bi) into RGF and PGF used as negative electrodes. The electrocatalytic activities of RGF and PGF before and after modification with Bi are investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS). Bismuth deposition on the negative electrode is found to improve the negative reaction in ICRFB.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Zhiwei Mou,Junyu Li,Cheng Liu,Yi Tan,Zitong Yan,Yawen Liu,Lin Zhu,Xin Chen,Tao Duan
Radioactive iodine aerosols released during spent fuel reprocessing pose a serious threat to public health. At present most air filters hardly achieve efficient filtration performance and effective adsorption of radioactive iodine gas at the same time, therefore it is of great significance to develop a multifunctional air filter. Herein, a bismuth-modified silica nanofiber air filter (Bi@SNF) with highly efficient filtration of particulate matter (PM) and adsorption of iodine gas was constructed by combining electrospinning nanofibers and bismuth nanoparticles. The prepared air filter has attractive features such as high specific surface area, hydrophobicity, high efficiency filtration performance toward PM0.3 (99.26 %, 113 Pa), high iodine gas adsorption capacity (1040 mg/g), and excellent stability in humidity, high temperature, acidic, and irradiated environments, which enables the filter to effectively purify iodine gas and particulate matter from iodine aerosols. The successful synthesis of this multifunctional air filter (Bi@SNF) with excellent overall performance provides a new solution for the purification of iodine aerosols in reprocessing plants, with the potential for application in practical working conditions.
研究领域:
环境科学
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材料科学
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核能工程
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2013
·
IF 3.187
Shuxing Wu,Jianzhang Fang,Weicheng Xu,Chaoping Cen
Herein, we reported an ultrasonic-assisted synthesis of bismuth-modified rectorite with high visible light-induced photocatalytic activity. The as-synthesized samples were characterized by XRD, FT-IR, FESEM, TEM, BET, and UV–vis DRS techniques. Two toxic and nonbiodegradable organic compounds, Rhodamine B (RhB) and 2,4-dichlorophenol (DCP), were chosen as the target pollutants to characterize the adsorption performance and photocatalytic activity. The results showed that the prepared samples possessed strong adsorbility and exhibited high efficient photocatalytic activity under visible light irradiation. The excellent photocatalytic activity of bismuth-modified rectorite was ascribed to the strong adsorption ability, the interconnected heterojunction of Bi 2 O 3 and Bi 5 O 7 NO 3 , and the produced OH. Finally, the possible mechanism was presented.
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 Chemical Engineering
·
2023
·
IF 7.7
Xuesong Zhou,Zhigang Gai,Yibao Wang,Shousheng Liu,Xueyu Zhang,Fengxiang Guo,Mei Zhang,Lili Zhang,Xin Jiang
The high performance detection of heavy metal ions in crucial water sources is of great significance to protect human health and life safety. Herein, a novel ratiometric detection system towards trace Cd(II) and Pb(II) has been established by utilizing in-situ bismuth modified nitrogen rich porous carbon/boron doped diamond (Bi/NC/BDD) composite electrode. Benefiting from the interconnected hierarchical micro/mesoporous structure and N-embedded partially graphitized carbon matrix of NC modifier, as well as the formation of Bi-alloy, an excellent sensitivity with low limit of detection (LOD, 0.24 μg L −1 for Cd(II) and 0.37 μg L −1 for Pb(II)) is realized. Moreover, the built-in normalization function of Bi(III) reference signal effectively improves the reliability and reproducibility of detection results. This work provides an important guidance for the development of quality environmental monitoring electrodes.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Miao Lai,Jie Zhao,Qingcai Chen,Shuaijun Feng,Yujie Bai,Yingxuan Li,Chuanyi Wang
In the photocatalytic volatile organic compounds (VOCs) degradation, the accumulation of intermediate products on the surface of catalysts could cause a decrease in activity through retarding reactant (e.g. O 2 ) supply to surface active sites. Herein, Bi decorated TiO 2 photocatalysts (Bi/TiO 2 ) for photocatalytic toluene degradation were prepared and systematically studied. It is found that metallic Bi modification improves the ability of photocatalysts to capture O 2 . As a result, the activities of the Bi/TiO 2 photocatalysts are obviously higher than that of the TiO 2 for photocatalytic toluene degradation, and the productions of photogenerated reactive oxygen species ( O 2 − and H 2 O 2 ) over the Bi/TiO 2 photocatalysts are almost equal to that over the TiO 2 despite the fact that the separation efficiency of photoinduced charge carriers is decreased after the addition of Bi. Adsorbed benzaldehyde is the main surface intermediate on the surface of the Bi/TiO 2 photocatalysts, whereas plenty of more readily oxidized aliphatic carboxylate species was monitored on the surface of the TiO 2 , which can be attributed to insufficient O 2 supply to the TiO 2 surface. This further indicates the positive role of the promoted O 2 supply by Bi in the photocatalytic toluene degradation. The present work offers a new window for addressing the catalyst deactivation in the photocatalytic VOCs degradation.
研究领域:
环境催化
·
大气污染控制
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材料化学
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表面科学
·
光化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）