APPLIED SURFACE SCIENCE
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2024
·
IF 6.3
Kun Wang,Shen Yu,Peng Jiang,Wenrui Liu,Man-Man Yuan,Wangyu Tong,Lihua Chen,Zhao Deng,Baolian Su
CO 2 reduction by a sustainable pathway such as photothermal catalysis is highly demanded currently, high carrier recombination rate still severely limits the performance of photothermal catalysis. Constructing heterojunction interfaces with high exposed area is an effective strategy to solve the problem of carrier recombination. However, fine control of the interface structure is still highly challenging. Herein, Density functional theory (DFT) calculations were constructed to reveal that metallic Bi leads to more densities of states (DOS) generation at the conduction band edge in Bi-BiOBr, which argues that photogenerated electrons are more likely to be delivered to metallic Bi. A TiO 2 @Bi-BiOBr hollow hierarchical core–shell heterojunction was designed, providing a highly exposed interface and Bi between interfaces. Such structure endows the catalyst with excellent photothermal catalytic performance, achieving a CO yield of 30.4 μmol·h −1 ·g −1 . The highly improved performance is attributed to interfacial thermoelectrons transfer boosted by the construction of TiO 2 @BiOBr heterojunction as well as metal Bi. And a possible CO 2 reduction pathway is proposed, which is consistent with the Carbine pathway. This study provides an exciting idea for the modulation of photoelectron transfer at catalyst interfaces.
研究领域:
材料科学
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环境科学
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催化化学
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产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 7
·1-20
·
IF 3.8
Wang Bo,Huang Lin,Li Silan,Qi Liqiang
Rhodamine B (RhB), an alkaline cationic organic dye, poses a significant threat to natural water environments. In this investigation, composites of Co 3 O 4 and BiOBr/BiOI were synthesized and evaluated for degradation of RhB under visible light irradiation. The photocatalyst (CBB-2) with a 10wt% Co 3 O 4 composite exhibited superior degradation efficiency, achieving 99.5% within 80 min and maintaining robust stability over four cycles. Meanwhile, after 90 min of light exposure, the mineralization rate of RhB reached 57.23%. A suite of characterization techniques verified the successful synthesis of the dual type-II heterojunction in the composite catalyst and the reinforced interactions among its components, thereby enhancing charge separation efficiency and photoresponsive performance. Free radical quenching experiments elucidated the critical role of •O 2 - and h + as radicals in the photocatalytic reaction process.
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 Environmental Chemical Engineering
·
2024
·
IF 7.4
Yanli Sun,Xueliang Wang,Hooi Ling Lee
A simple and economical precipitation process was used to in situ synthesize a heterojunction of BiOBr(110)/BiOCl(110). Numerous techniques, such as SEM, XRD , HRTEM , BET, FTIR, and XPS , verified the successful creation of the heterostructure. In particular, the heterostructures exhibited significantly enhanced photocatalytic degradation efficiency towards ceftazidime (CFZ). The degradation kinetic constant of CFZ by BiOBr(110)/BiOCl(110) (5:5) was three times higher than those of BiOBr and BiOCl. Additionally, a type I heterojunction was reasonably suggested following UV–vis DRS and VB-XPS investigations. DFT calculations indicated that an internal electric field (IEF) was created when electrons (e - ) on the BiOBr surface were transferred to BiOCl in the dark. Upon visible light illuminated, photoinduced-e - was transferred from the conduction band (CB) of BiOCl to that of BiOBr under the action of IEF. In contrast, holes (h + ) moved in the opposite direction, realizing the separation of e - /h + pairs. Three degradation pathways were deduced based on intermediate products (IPs) detection by HPLC-MS. Importantly, the heterojunction catalyst exhibited efficient catalytic performance across solutions with different pH and maintained great reusability during four cycles of photodegradation . Overall, the work revealed distinctive insights concerning the mechanism of antibiotic degradation with BiOBr(110)/BiOCl(110) heterojunction structures .
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
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Yanni Luo,Xuecai Tan,David J. Young,Quanyou Chen,Yuehui Huang,Defen Feng,Chenhao Ai,Yan Mi
In photoelectrochemical sensor (PEC sensor), sensitivity and selectivity are two essential factors which are determined by photosensitive of materials and identification of elements. Herein, a novel PEC aptamer sensor for streptomycin-specific detection was developed, with which the visible-light-active TiO 2 /BiOI/BiOBr heterostructure and aptamers were employed as photoactive material and bio-identification elements, separately. The combination of an appropriate amount of TiO 2 with BiOI/BiOBr enhanced the photocurrent response, and thus is beneficial to the construction of PEC sensors. In addition, the one-pot synthesis of TiO 2 /BiOI/BiOBr has the advantage of being environmentally-friendly. Under optimized conditions, the photocurrent response of aptamer/TiO 2 /BiOI/BiOBr/ITO is linear with SRT concentration from 0.05 to 150 nM, and the detection limit (S/N = 3) is as low as 0.04 nM. This novel PEC sensing strategy provided an ultra-sensitive sensor with high selectivity and stability for SRT detection.
研究领域:
生物传感技术
·
材料科学与工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Fei Bi,Zhemei Zheng,Rongrong Li,Ruiying Du,Li Zhao,Shanshan Xiao,Liyan Wang,Xiangting Dong
Photocatalytic composite membranes (BPMs) are preferred materials for wastewater treatment due to their high photocatalytic activity and ease of recovery. However, conventional blending modification methods for preparing BPMs often lead to drawbacks such as uneven distribution of photocatalysts, low loading efficiency, facile detachment of photocatalysts, poor reusability, and a limited specific surface area of the membranes. These issues significantly diminish their photocatalytic activity and restrict their practical applications. To address these challenges, this thesis introduces a novel preparation method for PVP-modified PVDF/BiOBr photocatalytic membranes, using a combination of electrospinning and solvothermal techniques. This approach enhances the stability of BiOBr microspheres on the PVDF nanofiber membranes, effectively tackling the issue of loading powder photocatalysts. These membranes, composed of PVDF nanofibers and uniformly sized BiOBr microspheres, exhibit a significant specific surface area of 15.69 m 2 /g. The modified PVDF/BiOBr photocatalytic membranes demonstrate remarkable degradation efficiencies: 100 % degradation of Rhodamine B (RhB) in 25 min, 93.8 % degradation of tetracycline (TC) in 30 min, and 74.6 % degradation of hexavalent chromium ions (Cr 6+ ) in 60 min. Moreover, after five cyclic experiments, the photocatalytic degradation rate of sample M 3 remains above 99 % with a minimal loss rate of only 0.5 %. The method developed for preparing PVDF/BiOBr photocatalytic membranes represents a universally applicable and straightforward strategy for fabricating advanced membrane materials. This preparation technique not only provides innovative design ideas and fabrication methods for new photocatalytic materials but also extends to other functional materials. The PVDF/BiOBr photocatalytic membrane materials hold great promise in offering technical and theoretical support for photocatalytic 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
ACS Omega
·
2022
·
IF 4.132
Weiwei Tie,Surjya Sarathi Bhattacharyya,Cancan Han,Shuaibiao Qiu,Weiwei He,Seung Hee Lee
A novel high-performance BiOBr@graphene (BiOBr@G) photocatalyst with a new assembly structure had been demonstrated using a facile hydrothermal method through chemical bonding of reduced graphene oxide and structure-defined BiOBr flakes for improving charge separation and transfer performance, which were first synthesized at room temperature in immiscible solvents without corrosive acids. The prepared samples were characterized, and the BiOBr@G composite realized an efficient assembly portfolio of graphene and BiOBr flakes with defined structures, verified by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman and X-ray photoelectron spectroscopy (XPS), in which BiOBr flakes were covalently linked with the assembled graphene sheets through the Bi–C bond. This composite exhibited remarkable visible light absorbance and efficient photoinduced charge splitting characteristics in comparison with those of pure BiOBr, as established by DRS absorption, photoluminescence radiation, and photocurrent study. Hence, a very small amount (5 mg) of the BiOBr@G composite displayed a complete photodegradation effect on the rhodamine B dye under only 15 min of visible light excitation, which was three times faster than that of pure BiOBr and extremely superior to that of commercial P25. This was probably ascribed to the well-defined BiOBr structure itself, elevated light absorbance, and Bi–C chemical bond inducing quick charge separation and transfer in the BiOBr@G composite. Additionally, investigations on the photocatalytic mechanism displayed that the photogenerated holes in the BiOBr valence band and derivative superoxide radicals played vital roles in the photodegradation of RhB dyes, as reinforced by the electron spin resonance method, where the covalent linking of BiOBr and graphene served as an effective pathway for charge transportation.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Yong Liu,Jia Li,Jiayao Li,Xiaohui Yan,Fudong Wang,Wenning Yang,Dickon H.L. Ng,Jie Yang
The development of new nanomaterials for the highly efficient wastewater treatment has been one of the hot scientific researches. Herein, we report a novel 3D Fe 3+ -doped BiOBr-based magnetic Janus micromotors with superior solar photo-Fenton catalytic activity for organic pollutant degradation. Taking advantage of hydrogen peroxide as reagent and fuel, Fe 3+ -doped BiOBr based Janus micromotors exhibited extremely high efficiency for methylene blue degradation in a solar photo-Fenton system even at mild pH conditions , which was almost 4 times than BiOBr. The speed of the Janus micromotors could reach 214.7 ± 19.4 μm s −1 in a 5% H 2 O 2 solution. Factors influencing the solar photo-Fenton reaction including Fe 3+ -doping amount, pH, concentration of H 2 O 2 , self-propelled movement as well as mechanical stirring were investigated to clarify the degradation mechanism . Nearly 97% of methylene blue was degraded by Fe 0.11 Bi 0.89 OBr/Fe 3 O 4 /Mn 3 O 4 Janus micromotors in the presence of 3% H 2 O 2 solution at neutral environment within 50 min. This study provided a new insight into the preparation of Janus micromotors for water purification applications based on solar photo-Fenton reaction.
研究领域:
环境科学
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纳米材料科学
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催化化学
✓ 已验证
DOI
高影响因子
Environmental Science-Nano
·
2019
·Vol. 6
·期 12
·3670-3683
·
IF 7.704
Hui Li,Fang Deng,Yang Zheng,Li Hua,Chunhua Qu,Xubiao Luo
Fabrication of Z-scheme heterojunctions and crystal facet engineering are effective strategies for enhancing visible-light photocatalytic redox ability. Visible-light-responsive Z-scheme reduced graphene oxide (rGO)/Bi2S3–BiOBr heterojunctions with a tunable exposed BiOBr (102) facet and high stability were prepared by a one-pot solvothermal strategy. A graphene oxide (GO) solution acts as a rGO precursor and crystal facet controlling agent of BiOBr (102). The optimized 1% rGO/Bi2S3–BiOBr catalyst shows a much higher photocatalytic activity in degrading a single-component 2-nitrophenol (2NP) solution and a reducing single-component Cr(VI) solution than Bi2S3, BiOBr and Bi2S3–BiOBr. In the mixture solution of 2NP and Cr(VI), 2NP degradation and Cr(VI) reduction occur simultaneously, and the Cr(VI) reduction efficiency and 2NP degradation efficiency reached 95% and 67%, respectively. The synergism of rGO/Bi2S3–BiOBr for simultaneous 2NP degradation and Cr(VI) reduction can be attributed to the efficient production of electrons and reactive oxygen species. This work sheds light on the design of facet-dependent Z-scheme photocatalysts to advance photocatalytic redox capability.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2016
·
IF 4.179
Yuhui Xiao,Xianghua Song,Zhuo Liu,Ruiping Li,Xiaorong Zhao,Yingping Huang
The degradation of cefazolin (CFZ) by Ag 3 PO 4 /BiOBr composites under visible-light irradiation was explored. The main and interaction of parameters (catalyst dosage, pH, CFZ initial concentration and degradation time) on removal of CFZ were studied by Box–Behnken design combined with response surface methodology. The pH was the most influential factor and both h + and OH played a role in the photocatalytic process. The high correlation coefficients (R 2 = 0.9986 and adjusted R 2 = 0.9973) demonstrated close fit between the predicted and experimental values. The exceptional efficiency of Ag 3 PO 4 /BiOBr composite in removing CFZ represents a promising technique for treatment of CFZ-containing wastewater.
研究领域:
环境科学
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药学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zaichun Sun,Bingchu Mei,Hao Zhou,Shaoyong Qin,Huijuan Zhang
High-quality (001) orientated bismuth oxobromide (BiOBr) thin films were deposited on polycrystalline Sn: In 2 O 3 -glass substrates at open-air atmospheric pressure with mist chemical vapor deposition (CVD). Generally, it is difficult to control the surface morphology and thickness for BiOBr because of the high anisotropic crystal structure and very volatile halide . In this study, the growing thickness of BiOBr thin films showed a linear correlation with deposition time. Small thickness resulted in limited absorption ability, while large thickness led to increase of electrical resistance. The surface morphology of (001) orientated BiOBr thin films can be improved obviously under the acidic environment via suppressing Bi 3+ hydrolysis. The (001) orientated BiOBr thin films that deposited by mixed solvent of DMF and 35% HNO 3 aqueous solution exhibited the highest photocurrent density with 0.33 mA cm −2 at 0.6 V vs Ag/AgCl. The intermediate thickness and continuous surface morphology effectively promote the transfer and separation of electron-hole pairs, leading to superior photoelectrochemical (PEC) performance.
研究领域:
材料科学
·
光电化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xiaoyuan Song,Junjian Niu,Wenjun Yan,Xuan Li,Xiaogang Hao,Guoqing Guan,Zhongde Wang
The separation and capture of Br - ions from aqueous solutions is of great significance in view of their dual characteristics, that is, its economic value and its harmful effect on human body. In this study, BiOBr@PPy electroactive hybrid film with core-shell structure, which was fabricated by in-situ coating conductive PPy on BiOBr with ion storage space, was applied to selectively capture Br - ions using electronically switched ion exchange technology (ESIX). The capture capacity of BiOBr@PPy hybrid film reached 146.2 mg g −1 at 0.8 V oxidation voltage. While, the hybrid film had an excellent selectivity towards Br - ions in the aqueous solution with several competing anions. It was confirmed that selective Br - ion capture/release by the BiOBr@PPy hybrid film was achieved through the synergistic effect generated from sufficient Br - ions storage space of BiOBr, highly conductivity and ion screening function of PPy, and powerful driving forces jointly activated by the electrochemical redox reaction of BiOBr and PPy. In addition, the capacity retention efficiency and release rate of the hybrid film still remained above 80% after 10 cycles due to the strategy of in-situ coating of PPy. It is predicted that such a BiOBr@PPy hybrid film with synergistic effects may be a potential electroactive material for the separation and capture of Br - ions from aqueous solutions.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Kun-Le Jia,Zhong-Shuai Zhu,Jin Qu,Ya-Qiong Jing,Xiao-Jie Yu,Yasmine Abdelkrim,Shu-Meng Hao,Zhong-Zhen Yu
Efficient separation of photogenerated electron-hole pairs is always one of the key factors boosting visible light photodegradation efficiency. Till now, there are few reports on the synergistic competitive consumption of photogenerated active species and the synergistic adsorption of organic contaminants to promote the performance of a designed heterojunction . Herein, we design and construct a novel BiOBr/Ag 6 Si 2 O 7 heterojunction with the dual synergistic effects towards methylene blue (MB) and methyl orange (MO). The dual synergistic effects could avoid the combination of photogenerated h + /e − pairs, improve the adsorption efficiency, and even regulate the photodegradation efficiency. Thus, for an aqueous mixture of MB and MO, the BiOBr/Ag 6 Si 2 O 7 photocatalyst exhibits largely improved adsorption capacities of the dyes by a multi-layer adsorption mode. Moreover, the photocatalyst could further promote the photodegradation rate of MO while slow that of MB due to the competitive consumption of photogenerated active species, showing a sequential selectivity phenomenon. Thanks to the dual synergistic effects, the adsorption capacity of MO increases 1379% higher than that of neat MO solution, and the photodegradation time decrease from 30 to 12 min with a rate constant of 0.22 min −1 , 38% higher than that of neat MO solution.
研究领域:
材料科学
·
环境科学
✓ 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）