Search query: Amorphous Bi2MoO6

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abstract: A novel Ag3PO4/reduced graphene oxide/Bi2MoO6 (Ag3PO4/RGO/Bi2MoO6) Z scheme photocatalyst has been successfully prepared by a precipitation solvothermal method. The composition, morphology, structure and optical properties of the ternary composite were thoroughly investigated. The obtained Ag3PO4/RGO/Bi2MoO6 composite displayed significantly enhanced photocatalytic activity for the degradation of methylene blue (MB) under visible light irradiation, and its degradation rate (0.14575 min 1) was approximately 2.34, 2.63 and 4.97 times faster than that of the Ag3PO4/Bi2MoO6 composite, pure Ag3PO4 and Bi2MoO6, respectively. Meanwhile, the Ag3PO4/RGO/Bi2MoO6 composite exhibited better stability compared with pure Ag3PO4 after four consecutive reuses. In addition, it shows good photodegradation efficiency for five other dyes under visible light irradiation. The improved photocatalytic performance and stability could be ascribed to the larger surface area, extended visible light absorption capability and high efficiency separation of electron hole pairs of the Ag3PO4/RGO/Bi2MoO6 composite. Furthermore, RGO could act as a charge transmission bridge to accelerate the electron transfer from Ag3PO4 to Bi2MoO6 (Ag3PO4 RGO Bi2MoO6) in this Z scheme system; thus the photocorrosion of Ag3PO4 and the recombination of charge carriers were effectively suppressed. The energy band structure and free radical capturing experiments proved that the electrons in the conduction band (CB) of Bi2MoO6 had stronger reducibility and the holes in the valence band (VB) of Ag3PO4 had higher oxidizability. Simultaneously, combined with the results of PL spectroscopy and photoelectrochemical measurements, the mechanism of Z scheme charge transfer in the Ag3PO4/RGO/Bi2MoO6 composite was further confirmed. This study provides an idea for improving the anti photocorrosion and photocatalytic performance of photosensitive semiconductors.
author_names: Pengfei Zhu

Yanjun Chen

Ming Duan

Zhihao Ren

Min Hu
title: Construction and mechanism of a highly efficient and stable Z scheme Ag3PO4/reduced graphene oxide/Bi2MoO6 visible light photocatalyst
year: 2018

abstract: Abstract Efficient visible light active ZnO/Bi2MoO6/AgBr nanocomposites were fabricated using ultrasonic assisted method. Crystallinity, structural, morphological, optical, and textural features of the photocatalysts were investigated by XRD, SEM, TEM, EDX, FT IR, UV Vis DRS, PL, and BET techniques. Photocatalytic performance of the ZnO sample was remarkably increased by combining with Bi2MoO6 and AgBr, due to formation of tandem n n heterojunctions. The as prepared ZnO/Bi2MoO6/AgBr nanocomposites exhibited excellent photocatalytic activity and stability under visible light in comparison with the ZnO, ZnO/Bi2MoO6, and ZnO/AgBr samples. About ~97% of RhB was removed in 70 min by the optimized ZnO/Bi2MoO6/AgBr (20% nanocomposite, which is 76.4, 4.75, and 17.3 times as fast as the ZnO, ZnO/Bi2MoO6 (20% and ZnO/AgBr (20% photocatalysts, respectively. It was confirmed that due to improved utilization of visible light, considerable separation of the charge carriers, and enlarged surface area, the ZnO/Bi2MoO6/AgBr (20% nanocomposite exhibited greatly improved photocatalytic activity in degradations of various dye contaminants under visible light illumination. In addition, plausible photocatalytic degradation mechanism for the highly enhanced performances were also proposed.
author_names: Mahsa Pirhashemi

Aziz Habibi-Yangjeh
title: Visible light photosensitization of ZnO by Bi2MoO6 and AgBr: Role of tandem n n heterojunctions in efficient charge transfer and photocatalytic performances
year: 2018

abstract: An in depth exploration associated with the localized surface plasmon resonance (LSPR) effect for plasmonic photoelectrochemistry (PEC) is beneficial for the development of high efficiency biosensors. A novel phenomenon on the LSPR between g C3N4/Bi2MoO6 and gold nanoparticles is investigated in a PEC aptasensing system under ultraviolet and visible light irradiation.
author_names: Zhenli Qiu

Jian Shu

Dianping Tang
title: Plasmonic resonance enhanced photoelectrochemical aptasensors based on g C3N4/Bi2MoO6.
venue: Chemical communications
year: 2018

abstract: Abstract Exploring visible light active semiconductor photocatalysts is one of greatly significant issues. We show herewith the Bi2MoO6/SnO2 hybrid photocatalysts meet the requirement for degradation of organic contaminant. The Bi2MoO6/SnO2 displays better visible light catalytic activity than that of Bi2MoO6. SnO2 as co catalyst can provide more active sites as well as transfer and restrain the charge recombination, leading to the enhancement of catalytic activity. 30 wt. SnO2 emersions can degrade 90% for nitrobenzene and 97% for Rhodamine under visible light irradiation.
author_names: Baibai Liu

Xinjuan Liu

Mengying Ni

Cheng Feng

Xuedi Lei

Can Li

Yinyan Gong

Leng-yuan Niu

Jinliang Li

Likun Pan
title: SnO2 as co catalyst for enhanced visible light photocatalytic activity of Bi2MoO6
year: 2018

abstract: Abstract In this paper, Bi2MoO6/ZnFe2O4 heterojunctions were successfully obtained by combining electrospinning and a solvothermal technique. The morphology and loading of Bi2MoO6 nanosheets of Bi2MoO6/ZnFe2O4 heterojunctions could be controlled by adjusting the concentration of molybdenum precursor during the solvothermal process. Comparative experiments revealed that the resulting Bi2MoO6/ZnFe2O4 heterojunctions exhibit a higher visible light photocatalytic activity for the degradation of Rhodamine B (RB) than pure Bi2MoO6 or ZnFe2O4. The photocurrent and PL measurements of the Bi2MoO6/ZnFe2O4 heterojunctions also indicated an enhanced separation of photo induced electron hole pairs. Moreover, the heterojunctions could be easily recycled without a decrease in their photocatalytic activity due to their good magnetic separation performance and excellent chemical stability. Based on these findings, Bi2MoO6/ZnFe2O4 heterojunctions are a promising visible light driven photocatalyst for converting solar energy to chemical energy for environmental remediation.
author_names: Chengcheng Zhao

Changlu Shao

Xinghua Li

Xiaowei Li

Ran Tao

Xuejiao Zhou

Yichun Liu
title: Magnetically separable Bi2MoO6/ZnFe2O4 heterostructure nanofibers: Controllable synthesis and enhanced visible light photocatalytic activity
year: 2018

abstract: In this study, a novel few layer WS2/Bi2MoO6 heterojunction with greatly enhanced visible light photocatalytic performance was synthesized via a facile hydrothermal method. The results indicated that Bi2MoO6 nanosheets were directly grown on the surface of few layer WS2 and form plate on plate heterojunctions. The synthesized nanocomposites exhibited excellent photocatalytic activity under visible light irradiation. The optimal composite with 5 wt% WS2 showed the highest photocatalytic activity, whose degradation efficiencies and TOC removal were 99.5% and 91.7% for rhodamine B (RhB) 98.9% and 89.8% for ciprofloxacin (CIP) 76.0% and 67.8% for methylene blue (MB) and 69.3% and 58.6% for methimazole (MMI) respectively. Their excellent photocatalytic performance was predominantly ascribed to the construction of a plate on plate heterojunction structure between WS2 and Bi2MoO6, which could promote charge separation efficiency and enhance light harvesting efficiency. The present work provides a new understanding for extending the application of transition metal dichalcogenides in the field of photocatalysis.
author_names: Xiang Li

Mengyuan Su

Guifen Zhu

Kaige Zhang

Xia Zhang

Jing Fan
title: Fabrication of a novel few layer WS2/Bi2MoO6 plate on plate heterojunction structure with enhanced visible light photocatalytic activity.
venue: Dalton transactions
year: 2018

abstract: A class of direct plate on plate Z scheme heterojunction SnS2/Bi2MoO6 photocatalysts was synthesized via a two step hydrothermal method. The materials were characterized by X ray diffraction, scanning electron microscopy, transmission electron microscopy, X ray photoelectron spectra, Fourier transform infrared photoluminescence emission spectra, and UV vis diffuse reflectance spectroscopy. The photocatalytic activity was estimated via the degradation of crystal violet (CV) and ciprofloxacin (CIP) The experimental results indicated that the 5 wt% SnS2/Bi2MoO6 composites exhibited significantly enhanced performance in contrast to pure Bi2MoO6 or SnS2 nanoflakes, and were also superior to the popular TiO2 (P25) The degradation reaction accorded well with the first order reaction kinetics equation; the rate constant of CV using a SnS2 content of 5 wt% photocatalyst was 3.6 times that of the Bi2MoO6 and 2.4 times that of SnS2. Furthermore, a SnS2 content of 5 wt% exhibited a 1.7 times higher photocatalytic activity of CIP than that of pure Bi2MoO6, and 1.3 times that of pure SnS2. Radical trapping experiments and an electron spin resonance technique indicated that h+ and *OH were the dominant active species involved in the degradation process. A plasmonic Z scheme photocatalytic mechanism was proposed to explain the superior photocatalytic activities and efficient separation of photogenerated electrons and holes.
author_names: Haijin Liu

Cuiwei Du

Haokun Bai

Yuzhao Su

Dandan Wei

Yuqian Wang

Guoguang Liu

Lin Yang
title: Fabrication of plate on plate Z scheme SnS2/Bi2MoO6 heterojunction photocatalysts with enhanced photocatalytic activity
venue: Journal of Materials Science
year: 2018

abstract: It has been reported that photogenerated electrons and holes can be directed toward specific crystal facets of a semiconductor particle, which is believed to arise from the differences in their surface electronic structures, suggesting that different facets can act as either photoreduction or photo oxidation sites. This study examines the propensity for this effect to occur in faceted, plate like bismuth molybdate (Bi2MoO6) which is a useful photocatalyst for water oxidation. Photoexcited electrons and holes are shown to be spatially separated toward the {100} and {001}{010} facets of Bi2MoO6, respectively, by facet dependent photodeposition of noble metals (Pt, Au, and Ag) and metal oxides (PbO2, MnO x, and CoO x) Theoretical calculations revealed that differences in energy levels between the conduction bands and valence bands of the {100} and {001}{010} facets can contribute to electrons and holes being drawn to different surfaces of the plate like Bi2MoO6. Utilizing this knowledge, the photo oxidative capability of Bi2MoO6 was improved by adding an efficient water oxidation co catalyst, CoO x, to the system, whereby the extent of enhancement was shown to be governed by the co catalyst location. A greater oxygen evolution occurred when CoO x was selectively deposited on the hole rich {001}{010} facets of Bi2MoO6 compared to when CoO x was randomly located across all of the facets. The elevated performance exhibited for the selectively loaded CoO x/Bi2MoO6 was ascribed to the greater opportunity for hole trapping by the co catalyst being accentuated over other potentially detrimental effects, such as the co catalyst acting as a recombination medium and/or covering reactive sites. The results indicate that harnessing the synergy between the spatial charge separation and the co catalyst location on the appropriate facets of plate like Bi2MoO6 can promote its photocatalytic activity.
author_names: Xuelian Wu

Judy N Hart

Xiaoming Wen

Liang Wang

Yi Du

Shi Xue Dou

Yun Hau Ng

Rose Amal

Jason Scott
title: Improving the Photo Oxidative Performance of Bi2MoO6 by Harnessing the Synergy between Spatial Charge Separation and Rational Co Catalyst Deposition.
venue: ACS applied materials interfaces
year: 2018

abstract: Abstract Bi2MoO6/reduced graphene oxide aerogel (BMO/GA) composite with enhanced adsorptivity and photocatalysis has been successfully synthesized through a simple one step solvothermal method. During solvothermal synthesis, Bi2MoO6 (BMO) as an efficient photocatalyst, which size was controllable, was uniformly distributed and well embedded into the pores of the 3D porous structure reduced graphene oxide aerogel (GA) and formed the 3D porous structure BMO/GA composite. The methylene blue (MB) was selected as a simulated pollutant, and the removal rate of BMO/GA composite toward MB was about 2.1 times as high as the pure BMO, which reached up 98.3% in 100 min. The BMO/GA composite with greatly improved adsorptivity and photocatalytic activity has some advantages of low cost, ease of preparation and facile of recovery from target contaminant solution. The excellent adsorption and photocatalytic degradation performance of BMO/GA composite is mainly owing to the BMO can be exactly embedded into the pores of GA and the RGO provided conductive electron channels for dispersing electrons. The synergistic effect of BMO and GA on enhancing the adsorption and photocatalytic degradation toward MB was also discussed by a proposed photocatalytic mechanism.
author_names: Xiang Liu

Jue Wang

Yuming Dong

Hexing Li

Yongmei Xia

Haijun Wang
title: One step synthesis of Bi2MoO6/reduced graphene oxide aerogel composite with enhanced adsorption and photocatalytic degradation performance for methylene blue
year: 2018

abstract: Controlled introduction of oxygen vacancies in metal oxide based photocatalysts could improve their charge carrier separation efficiencies to enhance their photocatalytic performances. In this work, oxygen vacancies were introduced in Bi2MoO6 nanosheets through a postsynthesis etching treatment by NaOH aqueous solution at room temperature for the first time, which removed the requirement of high temperature treatment, chemicals of high cost and environmental hazardness, or specific apparatus for the introduction of oxygen vacancies in previous studies. Furthermore, the crystal structure, morphology, optical properties, and energy band structures of these Bi2MoO6 nanosheets were not changed by this approach, which allowed the separation and illustration of the charge carrier separation role of oxygen vacancies for the photocatalytic performance enhancement. With the increase of oxygen vacancies, Bi2MoO6 nanosheets demonstrated improved electron hole separation efficiency and largely enhanced photocatalytic.
author_names: Chen Yan

Weiyi Yang

Shuang Gao

Caixia Sun

Qi Li
title: Synthesis of Bi2MoO6 Nanosheets with Rich Oxygen Vacancies by Postsynthesis Etching Treatment for Enhanced Photocatalytic Performance
year: 2018