JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Junhui Yi,Haoxian Zeng,Hai Lin,Minghao Li,Runkun Xie,Beifang Chen,Runsi Ding,Zhenghui Liu,Dehao Li,Ning Li
Rational design of Z-scheme heterojunction is known to be a good strategy for promoting photogenerated charge efficient separation. In this paper, a direct Z-scheme Ag 2 O/Bi 2 MoO 6 heterostructured microspheres with good interfacial properties were successfully prepared by hydrothermal synthesis-coprecipitation-calcination decomposition. Various techniques such as Transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), and powder X-ray diffraction (PXRD) were used to reveal the structure, morphology, composition, electrochemical and optical properties of the target product. The catalytic activity of the as-prepared composite was evaluated by visible light degradation of Rhodamine B (RhB) and transient photocurrent. As expected, the results showed that 1:5 Ag 2 O/Bi 2 MoO 6 exhibited the optimal catalytic performance. And the visible degradation efficiency is up to 86% in 90 min, which was 2.69 times higher than that of Bi 2 MoO 6 (32%). And 1:5 Ag 2 O/Bi 2 MoO 6 exhibited the highest photocurrent efficiency (0.8 μA/cm 2 ). Meanwhile, the efficiency of 1:5Ag 2 O/Bi 2 MoO 6 keep 90% after four cycles. The enhanced activity can be attributed to the formation of a good interfacial contact between Ag 2 O and Bi 2 MoO 6 . In addition, hole and superoxide were identified as the main active species. Eventually a possible direct Z-scheme mechanism was proposed to explain enhanced performance. This work may provide a new perspective for the rational design of excellent Bi 2 MoO 6 -based Z-scheme heterojunctions for environmental remediation.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yonglan Yang,Qianyu Cai,Liqiang Wang,Qiongmei Mai,Gang Ye,Jie Liu,Yanan Liu
Antibacterial Photocatalytic Therapy (APCT) is a promising therapeutic strategy for the treatment of bacterial infections, but it faces challenges such as low light utilization efficiency, insufficient reactive oxygen species (ROS) generation, and limited antibacterial efficacy. In this work, a novel Bi 2 MoO 6 @sRuO 2 @HA heterojunction (BMOsRH heterojunction) was constructed to address these limitations. The key innovation of this heterojunction lies in the introduction of sRuO 2 , which provides an effective charge carrier transfer interface for separated electrons and holes in Bi 2 MoO 6 , significantly delaying electron-hole recombination and promoting redox reactions that generate highly toxic ROS, thus enhancing antibacterial effects. Density functional theory (DFT) calculations indicated that BMOsRH possesses photocatalytic activity triply enhanced by near-infrared light absorption, defects, and the heterojunction. Consequently, under the combined action of near-infrared light and hydrogen peroxide, BMOsRH exhibited nearly 100 % antimicrobial activity against Escherichia coli (E. coli) and Methicillin-resistant Staphylococcus aureus ( MRSA ), and could also disrupt their biofilms. Furthermore, in mouse wound and abscess models of MRSA infection, BMOsRH effectively eliminated bacteria via mild photothermal therapy and significantly downregulated the inflammatory factors IL-1 β and TNF- α , promoting rapid wound healing. In summary, this light-controlled therapeutic strategy shows great potential for antibacterial applications.
研究领域:
微生物学
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材料科学
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医学
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DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2021
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IF 3.247
Jingling Wang,Wensong Lin,Manru Dong,Yue Xing,Qicheng Zhang
In this work, the CdS quantum dots (QDs) decorated Bi2MoO6/Bi2Mo3O12 (BMO) heterojunction photocatalyst (C/BMO) has been successfully synthesized using a facile two-step hydrothermal method. The as-prepared photocatalysts were characterized by XRD, FTIR, XPS, FESEM, TEM, UV-vis DRS, PL and photoelectrochemical measurements to investigate the effects of CdS(QDs) and BMO heterojunction on the structure, morphology, optical and charge carrier transmission characteristics of the photocatalysts. Narrow band gap and superior catalytic activities were found in C/BMO as compared with pure BMO. Moreover, the C/BMO photocatalyst containing twice CdS content (2-C/BMO) exhibits even higher photocatalytic activity and stability. After exposure to visible light for 30 min, the degradation rate of Rhodamine B (RhB), Methylene blue (MB) and Ofloxacin (OFX) by 2-C/BMO reached 95%, 92% and 76%, respectively. Radicals scavenging experiments and electron spin-resonance spectroscopy (ESR) investigations indicated that the superoxide radical anions (∙O2− ), hole (h+) and hydroxyl radicals (•OH) are the dominating active species in the photodegradation processes. ∙O2− and h+ are the key factors in the degradation of RhB and OFX solutions, and •OH is the major determinant in removal of MB. The process and photocatalytic mechanism on 2-C/BMO was discussed. Well absorption of visible light, effective separation of photoelectron-hole pairs and the transportation of photogenerated carriers at the interfaces of ternary semiconductor heterojunction are suggested as the key factors to enhance the photocatalytic performance of the photocatalysts.
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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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
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IF 8.328
Haiping Li,Tingxia Hu,Renjie Zhang,Jianqiang Liu,Wanguo Hou
Up to now, studies on solid-state Z-scheme two-component heterojunctions have hardly referred to roles of interfacial internal electric fields (IEFs). Herein, solid-state Z-scheme Bi 2 MoO 6 /MO (M = Cu, Co 3/4 , or Ni) heterojunction photocatalysts were simply synthesized, for the first time, with enhanced photocatalytic performance toward organic degradation. Electron microscopy images reveal that the MO homogeneously distributes on surfaces of the Bi 2 MoO 6 hierarchical microspheres, and they close contact with distinct heterojunction interfaces. X-ray photoelectron spectra (XPS) suggest that the electron transfer occurs between the Bi 2 MoO 6 and MO after they contact, resulting in formation of IEFs at their interfaces. Based on band gap values and valance-band XPS and ultraviolet photoelectron spectra, energy band levels of the Bi 2 MoO 6 and MO are defined, and directions of the interfacial IEFs are determined. The IEFs play key roles for the formation of the Z-scheme Bi 2 MoO 6 /MO heterojunctions and for the photoactivity enhancement. This work provides a better insight into the formation mechanism of solid-state two-component Z-scheme heterojunctions and a significant experimental guidance for studying other similar systems.
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
ChemistrySelect
·
2024
·Vol. 9
·期 23
·e202302680
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IF 1.9
Pengpeng Li,Lei Su,Juan Chen,Shuo Li,Fu Su
Graphical Co 3 O 4 /Bi 2 MoO 6 p-n type heterojunctions were successfully prepared by hydrothermal combined in-situ deposition. The degradation rate of enrofloxacin reached 87.84 % in 30 min under visible light irradiation with PMS (monoperoxysulfate). Thanks to the construction of the p-n heterojunction system and the activation of the PMS, the photogenerated charge carriers of the Co 3 O 4 /Bi 2 MoO 6 composite can be completely separated and transferred to produce active species with higher oxidation properties. On this basis, the photocatalytic mechanism of Co 3 O 4 /Bi 2 MoO 6 /PMS was explored. In this work, Co 3 O 4 /Bi 2 MoO 6 p-n-type heterojunctions were successfully fabricated via a hydrothermal method combined with in-situ deposition. The as-prepared samples were systematically characterized by means of SEM, TEM, XPS, XRD, etc. Through the synergistic effect of PMS (peroxosulfate monosalt), the obtained composite CB-2 has a superior degradation performance of enrofloxacin under visible light irradiation, and the degradation rate of enrofloxacin reaches 87.84 % within 30 min. The reaction process of enrofloxacin degradation was analyzed by 3D EEM (exception emission matrix spectrum) and LC–MS (liquid phase mass spectrometry). The influence of the reaction system on EFA degradation efficiency without PMS synergy and light was studied. The kind of free radical was determined from the outcome of the EPR and free radical capture experiment. Benefiting from the construction of the p-n heterojunction system and the activation of the PMS, the photogenerated carriers of the Co 3 O 4 /Bi 2 MoO 6 composite can be fully separated and transferred to produce active species with higher oxidative properties. Based on this, the photocatalytic mechanism of Co3O4/Bi2MoO6/PMS was explored.
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
NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 46
·期 4
·1704-1712
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IF 3.591
Xiu-Jie Yang,Lunan Wu,Ruona Hu,Junqi Xing,Guohao Zhou,Shufen Lu,Jun Wu,Peng Li,Dong Liu
In this paper, hollow Bi2MoO6 microspheres (h-Bi2MoO6) were prepared via a simple solvothermal method. Then, h-Bi2MoO6/(Zn/Ti)LDH composite photocatalysts were prepared through the in situ growth of a Zn–Ti layered double hydroxide ((Zn/Ti)LDH), owing to electrostatic interactions of opposite electrical charges. The obtained h-Bi2MoO6/(Zn/Ti)LDH composites were characterized using X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, N2 adsorption–desorption Brunauer–Emmett–Teller (BET) analysis, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), and fluorescence spectroscopy. The (Zn/Ti)LDH nanosheets enhanced the charge separation efficiency and expanded the light absorption region by constructing a heterojunction structure. As a result, h-Bi2MoO6/(Zn/Ti)LDH-2% exhibited the highest photocatalytic degradation rate which is 6.8 times that of h-Bi2MoO6. Based on the active species trapping experiment results, it can be speculated that photogenerated holes (h+) and hydroxyl radicals (˙OH) play major roles in the photocatalytic degradation of rhodamine B. What's more, the h-Bi2MoO6/(Zn/Ti)LDH composite photocatalyst exhibited excellent stability and recyclability, revealing remarkable potential for organic wastewater treatment.
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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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
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IF 6.4
Mingnv Guo,Ziqi Wang,Xiaolong Wu,Jiaqi Qiu,Linlin Gu,Zhongqing Yang
The carrier migration limitation has been a key factor restricting the photothermal catalytic CO2 reduction. To further enhance carrier transport, Bi2MoO6 quantum dots (BM QDs) are deposited on the surface of alkali-activated pomelo-peel-derived carbon (CPP-A) to construct CPP-A/BM QDs 0D/3D heterojunctions in this paper. BM QDs have extremely short carrier transport distances and achieve photothermal synergy through the graded utilization of the full solar spectrum. The carbon framework of CPP promotes the high dispersion of BM QDs (3 nm) and allows the local surface temperature of the catalyst to increase rapidly up to 100 °C. The critical role of heat enhances the diffusion, adsorption, and carrier migration processes of CO2 and provides the energy to cross the CO2 activation energy barrier. More importantly, the oxygen-containing groups of CPP and BM QDs form a C–O–Bi interfacial electron bridge, which provides a high-speed channel for carrier transport across the interface, allowing many electrons generated by BM QDs to migrate rapidly to the CPP surface, inducing CPP as a new electron-rich surface for rapid CO2 activation, which results in an ultrahigh CO yield of 61.44 μmol/(g·h) for CPP-A/BM QDs, and the catalytic activity is increased by 9.12 times.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
·Vol. 30
·期 30
·75247-75261
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IF 5.8
Sun Qing,Hu Xiaofang,Zhao Yingjie,Zhang Jian,Sheng Jiawei
Dissolved antibiotics have been a research subject due to their widespread presence and potential threats in drinking water treatment. To enhance the photocatalytic activity of Bi 2 MoO 6 for the degradation of norfloxacin (NOR), the heterostructured Co 3 O 4 /Bi 2 MoO 6 (CoBM) composites were synthesized by employing ZIF-67-derived Co 3 O 4 on Bi 2 MoO 6 microspheres. The as-synthesized resultant material 3-CoBM by 300 °C calcination was characterized by XRD, SEM, XPS, transient photocurrent techniques, and EIS. The photocatalytic performance was evaluated by monitoring different concentrations, NOR removal from aqueous solution. Compared with Bi 2 MoO 6 , 3-CoBM exhibited the better adsorption and elimination capacity of NOR due to the combined effect between peroxymonosulfate activation and photocatalytic reaction. The influences of catalyst dosage, PMS dosage, various interfering ions (Cl − , NO 3 − , HCO 3 − , and SO 4 2− ), pH value, and type of antibiotics for application removal were also invested. By activating PMS under visible-light irradiation, 84.95% of metronidazole (MNZ) can be degraded within 40 min, and NOR and tetracycline (TC) can be completely degraded using 3-CoBM. Degradation mechanism was elucidated by quenching tests in combination with EPR measurement, and the degree of activity of the active groups from strong to weak is h + , SO 4 - •, and •OH, respectively. The degradation products and conceivable degradation pathways of NOR were speculated by LC-MS. In combination of excellent peroxymonosulfate activation and highly enhanced photocatalytic performance, this newly Co 3 O 4 /Bi 2 MoO 6 catalyst might be a promising candidate for degrading emerging antibiotic contamination in 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
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Haotian Liu,Chuang Wang,Yi Yang,Minghui Gao,Aifang Xue,Hao Chen,Xing Ding
The preferential degradation of specific harmful organic pollutants in photocatalytic processes is critically important, yet remains a significant challenge due to the uncontrolled nature of reactive species, particularly those with high oxidation potentials such as •OH and h + . In this work, we designed an iodine-doped Bi 2 MoO 6 semiconductor to establish a system for photo-induced H 2 O 2 generation. The incorporation of iodine led to a steady enhancement in the selective photo-degradation of para -substituted phenolic pollutants, known precursors to carcinogenic p-benzoquinones, facilitated by the activation of iodine radicals through H 2 O 2 . This system exhibited impressive photo-degradation (96 %) and mineralization efficiency for acetaminophen (APAP), along with superior environmental applicability. It also demonstrated selectivity in degrading phenols with para -substitutions. The in-situ generation and activation of H 2 O 2 and •I were identified as the crucial pathways in this photocatalytic system. This work provides a novel modification path to accomplish the simultaneous generation and utilization of H 2 O 2 in the photocatalytic system and ultimately makes a remarkable performance for the targeted remediation of environmental pollutants.
研究领域:
环境科学
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光催化材料
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污染治理
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Kai Zhao,Zisheng Zhang,Yalan Feng,Shuanglong Lin,Hong Li,Xin Gao
The development of efficient strategies to promote spatial charge separation is a promising way for the improvement of photocatalytic performance. Herein, a novel surface oxygen vacancy (OVs) modified Bi 2 MoO 6 /MIL-88B(Fe) heterostructure (BMO/M88) was exemplified by a facile two steps solvothermal method to demonstrate synergistic promotion of bulk & interface charge separation. Due to the existence of OVs and the construction of heterostructure, the Bi 2 MoO 6 /MIL-88B(Fe) composites exhibited significant enhancement of visible-light responsive range and possessed more efficient bulk & interface charge separation. This novel Bi 2 MoO 6 /MIL-88B(Fe) composites exhibited high visible light photocatalytic performance toward dye pollutant rhodamine B (RhB) and model colorless pollutant bisphenol A (BPA) photodegradation , and the possible Type II heterojunction mechanism of photocatalysis process was investigated. This work not only provides a novel pathway for design of MOFs-based heterojunction with surface OVs defect modification but also offers a strategy for significantly enhanced bulk & interface charge carriers separation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2024
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IF 4.3
Mei Su,Yulu Chen,Linqi Wang,Zihao Zhao,Honggang Sun,Guoli Zhou,Pan Li
In our study, a series of WO 3 /Bi 2 MoO 6 heterostructured photocatalysts consisting of Bi 2 MoO 6 nanosheets and WO 3 nanorods were synthesized. Due to the Bi 2 MoO 6 nanosheets with two-dimensional structure, the as-prepared WO 3 /Bi 2 MoO 6 heterostructures had abundant oxygen vacancy defects and high exposure of active Bi 2 MoO 6 (010) facets. Compared with the pure Bi 2 MoO 6 and the oxygen vacancy-poor WO 3 /Bi 2 MoO 6 sample, the WO 3 /Bi 2 MoO 6 heterostructure with WO 3 weight ratios of 6 wt% (denoted as WO/BMO(6)) displayed improved photocatalytic activities in degradation of RhB and OTC under visible-light irradiation. The photoluminescence spectra, photoelectrochemical measurements and DOS analysis illustrated that the desirable photocatalytic performance of the WO/BMO(6) composite was attributed to the synergistic effect of heterojunction interface and oxygen vacancy defects on the efficient charge separation and transfer. Based on the trapping experiments, a Z-scheme charge transfer mechanism was proposed for the WO 3 /Bi 2 MoO 6 heterostructure.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Environmental Science-Nano
·
2021
·Vol. 8
·期 12
·3629-3642
·
IF 8.131
Jiaojiao Wang,Xiaoqing Jia,Denghui Shang,Liangbo Xie,Yi Li,He Zhang,Sihui Zhan,Wenping Hu
The long-term overuse of ciprofloxacin has resulted in its ubiquitous release into aquatic environments, seriously threatening public and ecological security. Herein, a photo-assisted-electro-Fenton-like (PAEF-like) system using p–n type Cu2O/Bi2MoO6 (CBM) as photoelectric catalyst was designed for efficient ciprofloxacin removal. The realization of photo-assisted function benefited from the perfectly constructed p–n heterojunction, which effectively regulated the carrier migration behaviors and drove the directional delivery of photoinduced electrons with flexible reactivity. Furthermore, photoinduced electrons directly or indirectly promoted the activation of H2O2 to enhance the ability of the PAEF-like synergy system to form ˙OH, improving the photoelectric catalytic activity. As dominant active species, ˙OH cooperated with h+ and ˙O2−, leading to the efficient elimination of ciprofloxacin. Finally, the degradation rate within 120 min reached almost 100%, and the corresponding kinetic constant was 208 and 1.5 times that of the photocatalytic and EF-like system, separately. Importantly, CBM-25% still maintained superior removal effect after four consecutive runs, revealing the high stability and practical feasibility of the PAEF-like system.
研究领域:
环境科学
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材料科学
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化学工程
·
催化
✓ 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）