JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Chengbo Bai,Yuhan Zhang,Qiong Liu,Chengxin Zhu,Jun Li,Rong Chen
To address the observed decrease in efficiency during Fe 2+ -mediated persulfate (PDS) activation caused by slow electron transfer rates and challenges in cycling between Fe 3+ /Fe 2+ states, we devised a strategy to establish interfacial complexation between Fe 3+ and Bi 2 MoO 6 in the presence of PDS. The proposed approach facilitates more efficient capture of photogenerated electrons, thereby accelerating the rate-limiting reduction process of the Fe 3+ /Fe 2+ cycle under visible light irradiation and promoting PDS activation. The Bi 2 MoO 6 /Fe 3+ /PDS/Vis system demonstrates complete degradation of organic pollutants, including Atrazine (ATZ), carbamazepine (CBZ), bisphenol A (BPA), and 2,4-dichlorophenol (DCP) at a concentration of 10 mg/L within a rapid reaction time of 30 min. Radical scavenging experiments and electron paramagnetic resonance spectra (EPR) confirm that the sulfate radical (•SO 4 − ) is the dominant species responsible for organic contaminant degradation. The real-time conversion process between Fe 3+ and Fe 2+ was monitored by observing changes in iron species forms and concentrations within the reaction system. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy verify the formation of a complexation between Fe 3+ and Bi 2 MoO 6 , facilitating anchoring of Fe 3+ onto material surface. Based on these findings, we propose a reliable mechanism for the activation reaction. This work presents a promising heterogeneous PDS activation method based on Fe 3+ /Fe 2+ cycle for water treatment.
研究领域:
环境科学
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化学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Zhuangzhuang Yin,Shihan Qi,Shangkun Deng,Kang Xu,Zhu Liu,Miao Zhang,Zhaoqi Sun
In this study, a Bi 2 MoO 6 /TiO 2 heterojunction photocatalyst modified with Ag quantum dots was successfully synthesized. The results demonstrated that Ag–Bi 2 MoO 6 /TiO 2 exhibited excellent photoelectrochemical performance and photocatalytic activity for the degradation of tetracycline hydrochloride. The catalyst had the best photocurrent density with a maximum value of 103.0 µA/cm 2 , which was 11.7 times higher than that of unmodified TiO 2 nanorods. Ag–Bi 2 MoO 6 /TiO 2 significantly increased the absorption intensity and red-shifted with a bandgap of 1.88 eV, which is substantially narrower than that of TiO 2 . Furthermore, it exhibited extremely high photocatalytic activity for the degradation of tetracycline hydrochloride with a degradation rate of 90.8% at 120 min. A photocatalytic mechanism was proposed to explain the principle of tetracycline hydrochloride degradation using this catalyst.
研究领域:
材料科学
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环境科学
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光催化技术
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DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 33
·5481-5490
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IF 3.117
Liruhua Zhang,Qianhong Shen,LiXing Yu,Feilong Huang,Changteng Zhang,Jiansong Sheng,Fang Zhang,Di Cheng,Hui Yang
A novel Bi2MoO6/N–TiO2 hierarchical heterostructure photocatalyst was successfully fabricated through the in situ growth of Bi2MoO6 nanosheets on rough N–TiO2 nanorods with a bark-like surface, and the structure–property relationship of this composite material was researched. The results show that the unique bark-like morphology of N–TiO2 leads to superior adsorption ability, and also provides effective growth sites for Bi2MoO6 nanosheets. The growth of Bi2MoO6 nanosheets leads to the formation of a hierarchical structure, therefore increasing the adsorption ability. The heterostructure between Bi2MoO6 and N–TiO2 promotes the highly efficient separation and transfer of photogenerated carriers. These features make the Bi2MoO6/N–TiO2 composite photocatalyst exhibit outstanding photocatalytic activity, and the optimal photocatalytic degradation rate for tetracycline hydrochloride (20 mg L−1) is up to 93.76% in 90 min under weak-visible-light irradiation (5 W, LED, λ > 400 nm). After five cycling runs, the composite photocatalyst still maintains high photocatalytic activity. Holes and superoxide radicals are confirmed to be the main reactive species in the photocatalytic reaction over the Bi2MoO6/N–TiO2 composite photocatalyst.
研究领域:
材料科学
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环境科学
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光催化技术
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DOI
高影响因子
CHEMOSPHERE
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2024
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IF 8.1
Guanwei Peng,Yanyu Xie,Hui Chen,Jin Zou,Li Li,Chuanfa Luo,Limin Lu,Guojiang Mao
Photo-Fenton-like technology based on H 2 O 2 is considered as an ideal strategy to generate reactive oxygen species (ROS) for antibiotic degradation, but O 2 overflow in the process severely limits the utilization efficiency of H 2 O 2 . Herein, we fabricate Bi 2 MoO 6 (BMO) photocatalyst modified with Frustrated Lewis pairs (FLPs) as a Fenton catalyst model for enhancing reuse of spilled O 2 . The FLPs created by the introduction of cerium and oxygen vacancy were found to contribute to regulate the electronic structure of BMO and further improve the acidic and basic properties of photocatalyst surface. More importantly, the frustrated acid and base sites can enhance the H 2 O 2 and O 2 interfacial adsorption process and provide an Ce 4+ -O v -O 2− active site on the surface of Ce-BMO nanosheets, which can promote O 2 /•O 2 − / 1 O 2 /H 2 O 2 redox cycles to achieve high H 2 O 2 utilization efficiency. Specifically, in the experiment using tetracycline as a photocatalytic degradation object, the degradation activity of Ce-BMO was 2.15 times higher than that of BMO pure phase. Quenching experiments and EPR assays also confirmed that 1 O 2 and •O 2 − were the dominant oxidative species. This study systematically reveals the design of Fenton photocatalytic active sites at the atomic scale and provides new insights into constructing FLPs photocatalysts with high H 2 O 2 utilization efficiency.
研究领域:
环境科学
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材料科学
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化学
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DOI
PubMed
高影响因子
Catalysis Science & Technology
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2023
·Vol. 13
·期 13
·3916-3926
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IF 5
Guangcheng Zou,Rui Cao,Conghui Cui,Yuqiang Luo,Chen Huang,Xinwei Cui,Zhiwen Wang,Yujie Song
Monolayer Bi2MoO6 nanosheets doped with F atoms (F-BMO-NSs) were developed as catalysts for the one-pot alkylation of nitrobenzene with benzyl alcohol. 95.88% conversion of nitrobenzene coupled with 99.98% selectivity of n-benzylideneaniline was achieved over the F0.04-BMO-NSs under visible light irradiation and 1 atm N2 at room temperature. XPS and EPR results suggested that F doping not only produced enhanced Lewis acid sites (Bi3+ and Mo6+), but also generated Lewis base sites (Mo5+). In situ FTIR spectra revealed that benzyl alcohol would be selectively adsorbed on the enhanced Lewis acid sites via Bi3+ (Mo6+)⋯OH–C– interface coordination, resulting in the activation of HO–C–. Moreover, nitrobenzene would be chemisorbed on the Mo5+ basic sites via Mo5+⋯NO2 coordination, inducing charge transfer from Mo5+ to –NO2. Under visible light irradiation, hydrogen transfer takes place from the chemisorbed benzyl alcohol to nitrobenzene generating benzaldehyde and aniline, finally coupling to form the imine. Based on these surface cooperated functional sites, a synergistic mechanism has been proposed to elucidate the accurate structure–performance relationship. This work provides a new perspective for the design of high activity, high selectivity and high stability photocatalysts for the precise synthesis of imines.
研究领域:
材料科学
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催化化学
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环境科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2019
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IF 8.456
Hao Wang,Yongqing Wang,Chunli Jiang,Kaihang Ye,Xiaohui He,Can Xue,Zujin Yang,Xiantai Zhou,Hongbing Ji
Herein, CuO/Bi2MoO6 hybrid nanosheets were prepared as a surface multifunctional photocatalyst for gas-phase toluene oxidation with high conversion (>99%). Aberration-corrected scanning transmission electron microscopy suggested that CuO species were highly dispersed on the nanosheets. X-ray absorption fine structure spectra indicated that the distorted and stretched Cu–O coordination structures in CuO/Bi2MoO6 nanosheets would provide open active sites. In situ Fourier transform infrared and density functional theory results showed that toluene molecules could be chemisorbed and activated on the active sites of CuO/Bi2MoO6 nanosheets by the C–H group forming CuO/Bi2MoO6···Ph-CH3 surface complex compounds. These would induce electron–hole transfer and initiate photocatalytic reactions under visible light irradiation. The corresponding intermediates of benzaldehyde and benzoic acid would be detected by in situ diffuse reflectance infrared Fourier transform spectroscopy. Furthermore, the synergistic effect of CuO and Bi2MoO6 nanosheets could monitor charge dynamics to facilitate their respective transmission from photoexcitation sites to active centers. This work provides new insights into the essence of visible-light-driven surface photocatalysis and is expected to promote the design of novel and more effective photocatalysts at the molecular level.
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Chuan Shi,Haohao Cui,Enhui Ma,Ke Wang,Hong Wang
The large amount of mineral processing wastewater generated during the extraction of rare earth elements, especially the organic flotation reagents inside, has posed great environmental threats. In this work, a facile method to prepare tubular micromotors based on CuS and MnO 2 was proposed, followed by further integration of Bi 2 MoO 6 on the micromotor surface to enhance the photocatalytic activity. The resulting Bi 2 MoO 6 @MnO 2 @CuS tubular micromotors which could realize autonomous motion by the generation of abundant micro/nanobubbles were employed for the removal of salicylhydroxamic acid (SHA), a commonly used reagent in rare earth ores flotation, via photo-assisted Fenton-like processes. The incorporation of Bi 2 MoO 6 in the tubular structure increased the SHA removal efficiency under visible light by 32.51 %. Moreover, the synergistic effect between photocatalysis and Fenton-like processes contributed to a SHA removal efficiency of 95.51 % within 30 minutes. A possible mechanism was proposed to explain the enhanced catalytic activity of the tubular micromotors. This study provides a way to fabricate tubular micromotor with low-cost and stable materials in batches, which may shed light on the treatment of rare earth ore processing wastewater.
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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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Jun Yang,Taiping Xie,Yuhan Mei,Junyu Chen,Hao Sun,Shan Feng,Yu Zhang,Ying Zhao,Jiankang Wang,Xiaoqing Li,Jiahong He,Houyang Chen
High photocorrosion and poor reaction efficiency of Bi 2 MoO 6 greatly hampered its wide application in wastewater treatment . Herein, V doped Bi 2 MoO 6 was prepared by hydrothermal-subsequent annealing strategy for the refractory sulfapyridine abatement through visible-light-driven photocatalytic activation of peroxymonosulfate (PMS). The degradation results revealed V-doped Bi 2 MoO 6 could achieved 100% sulfapyridine removal after 20 min over Bi 2 MoO 6 /PMS/Vis system, much higher than Bi 2 MoO 6 /PMS/Vis system. Experimental and theoretical calculations indicated that the V doping not only changed the energy band structure of Bi 2 MoO 6 and promoted the separation of photogenerated charges as well as improved the adsorption energy of peroxymonosulfate (PMS), H 2 O and dissolved oxygen on the catalyst surface, but also provided additional PMS activation pathway through V 5+ /V 4+ redox cycles, finally contributed to enhanced sulfapyridine degradation performance in Bi 2 MoO 6 /PMS/Vis system. Our work provides insight into designing highly efficient photocatalyst as a promising PMS activator for environmental application.
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
RSC Advances
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2020
·Vol. 10
·期 27
·15870-15880
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IF 3.119
Zhongmin Wang,Xinli Tian,Dong Sun,Penghui Cao,Mengkui Ding,Yuhao Li,Ning Guo,Ruizhuo Ouyang,Yuqing Miao
By doping molybdenum (Mo) into bismuth oxide (Bi2O3), we synthesized novel Bi2MoO6 nanohybrids with a unique tremella-like crystal structure via a one-pot hydrothermal method. Such a porous tremella structure of Bi2MoO6 possesses a significantly larger surface area than the spherical structure of Bi2O3, which is favorable for the special functionalization and effective immobilization of molecules such as antibodies on the surface of the tremella flaps. As expected, Au nanoparticles grew easily and uniformly outside the surface of the flaps of the as-prepared Bi2MoO6 NTs (Au@Bi2MoO6 NTs), showing preferable conductivity and biocompatibility, and the anti-carcinoembryonic antigen (anti-CEA) was effectively immobilized outside the obtained Au@Bi2MoO6 NTs. Acting as a novel label-free immunosensing platform, the anti-CEA-immobilized Au@Bi2MoO6 NTs were used to fabricate an electrochemical immunosensor for the quantitative detection of CEA. The as-prepared Au@Bi2MoO6-based immunosensor linearly responded to CEA in a wide concentration range from 1 pg mL−1 to 1 μg mL−1 with a detection limit calculated to be 0.3 pg mL−1 (S/N = 3), significantly comparable to numerous existing immunosensors. Moreover, the minimum detection concentration of the designed immunosensor was about ten times smaller than that of many Bi and Mo-based sensors toward CEA detection, and the detection limit was lower, revealing higher sensitivity. The satisfactory selectivity and stability made the immunosensor potentially applicable for CEA detection in real samples.
研究领域:
生物医学工程
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材料科学与工程
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分析化学
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DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2024
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IF 8
Xianhua Liu,Miao Liu,Yexin Dai,Jinran Cui,Asad Jamil,Wanxin Liu,Jiaxuan Li,Jiao Wang
Constructing a photocatalytic membrane and photo-Fenton reaction coupling system is a novel strategy to enhance the photocatalytic activity of the membrane and eliminate the problem of membrane contamination. Herein, a g-C 3 N 4 /Bi 2 MoO 6 /PVDF photocatalytic membrane was prepared using a tannic acid-assisted in-situ deposition method. The membrane was characterized by three advantages of photocatalytic, self-cleaning, and antibacterial properties. Under the photo-Fenton-like conditions, the membrane had superior photodegradation efficiency of 90.7% for tetracycline, one of the main antibiotic contaminants in the China's aquatic system. Moreover, the membrane had excellent photo-Fenton self-cleaning ability, its flux recovery rate was up to 96%–98% after the self-cleaning process. Photoluminescence spectra, diffuse UV–visible spectrum, transient photocurrent responses, and electrochemical AC impedance spectrum results show that the heterojunction structure formed by g-C 3 N 4 and Bi 2 MoO 6 could improve the separation efficiency of photogenerated electrons-hole pairs. Electron spin resonance spectroscopy confirmed the photo-electrons facilitated the formation of hydroxyl radical (·OH) in the existence of H 2 O 2 , which enhanced tetracycline degradation. Moreover, the superior photo-Fenton self-cleaning performance, which mainly relied on the active free radicals produced by the photo-Fenton-like membrane to remove dirt on the membrane surface or in the membrane pore channel. Our results may shed new light on the development of promising photocatalytic membrane systems by coupling with photo-Fenton-like processes, and facilitate their applications for wastewater treatment .
研究领域:
环境科学
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材料科学
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废水处理
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
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IF 7.435
Xiaoxuan Li,Siman Fang,Lei Ge,Changcun Han,Ping Qiu,Weilong Liu
A novel plasmonic photocatalysts of Ag/AgCl-Bi 2 MoO 6 was successfully synthesized via a simple and mild wet-chemical process. The physical and photophysical properties of the as-prepared Ag/AgCl-Bi 2 MoO 6 samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), Ultraviolet–visible diffuse reflection spectroscopy (DRS), electron spin resonance (ESR), photoluminescence emission spectra (PL) and surface photovoltage spectroscopy (SPV). The interaction between Ag/AgCl and Bi 2 MoO 6 has been investigated by X-ray photoelectron spectroscopy (XPS) analysis, and which is facile to the electron transfer between Ag/AgCl and Bi 2 MoO 6 and result in the enhancing photocatalytic activity of Ag/AgCl-Bi 2 MoO 6 composite. The photocatalytic experiments indicate that the Ag/AgCl species can efficiently promote the separation efficiency of photo-generated charge carriers in Bi 2 MoO 6 , and consequently improve the RhB photodegradation activity. The 20 wt% Ag/AgCl-Bi 2 MoO 6 sample shows the highest photocatalytic activity, the degradation constant of 20 wt% Ag/AgCl-Bi 2 MoO 6 was as high as 4 times to that of pure Bi 2 MoO 6 . A possible catalytic mechanism for Ag/AgCl-Bi 2 MoO 6 is proposed, which can be attributed to the surface plasmon resonance (SPR) effect from Ag/AgCl species.
研究领域:
材料科学
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光催化
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纳米材料
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环境化学
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半导体物理
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表面科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
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IF 9.136
Jianhao Qiu,Dingliang Dai,Lu Zhang,Guanglu Xia,Jianfeng Yao
Oxygen vacancy-rich Bi 2 MoO 6 nanoflakes were uniformly anchored on cuboid MIL-121 via benign solvothermal and thermal-reduction methods. Benefiting from the efficient light capture and rich electron traps triggered by oxygen vacancies, intimate interface contact and intrinsic heterostructure, the enhanced separation and transportation rates of photo-induced charge carriers are achieved. Consequently, Bi 2 MoO 6 /MIL-121 with rich oxygen vacancies performs excellent photocatalytic activities, which are 4.8, 7.1, 1.4 times higher for Cr(VI) reduction, and 6.1, 5.4, 1.2 times higher for 2-nitrophenol degradation compared with those of Bi 2 MoO 6 , MIL-121 and Bi 2 MoO 6 /MIL-121 without oxygen-vacancies, respectively. Furthermore, thanks to the timely consumption of photo-induced electrons and holes by Cr(VI) reduction and 2-nitrophenol degradation, respectively, the corresponding photocatalytic efficiencies are further boosted in their coexistent environment. This work would enlighten the design of metal-organic framework-based (photo)catalysts for the treatment of complicated pollution.
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
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