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TiO2/BiVO4, a Heterojuncted Microfiber with Enhanced Photocatalytic Performance for Methylene Blue under Visible Light Irradiation 认领 引用 被引量：7
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作者 马占营 李小博 +2 位作者 周彩华 邓玲娟 范广 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2017年第2期153-160,I0001,共8页
Novel TiO2/BiVO4 microfiber heterojunctions were constructed using cotton as biomorphic templates. The as-synthesized samples were characterized by scanning electron microscope, X-ray diffraction, X-ray photoelectron ... Novel TiO2/BiVO4 microfiber heterojunctions were constructed using cotton as biomorphic templates. The as-synthesized samples were characterized by scanning electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectra and photocatalytic experiment. The morphology of the as-synthesized TiO2/BiVO4 composites was consisted of a large quantity of microfiber structures with diameter from 2.5 gm to 5 μm, and the surface of samples became more coarse and compact with the increase of weight ratio of TiO2. The TiO2/BiVO4 samples with proper content （10.00wt%） showed the highest pho- tocatalytic degradation activity for methylene blue （MB） degradation among all the samples under visible light, and 88.58%MB could be degraded within 150 min. The enhancement of photocatalytic activity was mainly attributed to the formation of n-n heterojunction at the contact interface of TiO2 and BiVO4, which not only narrowed the band gap of BiVO4 for extending the absorption range of visible light, but also promoted the transfer of charge carriers across interface. A possible photodegradation mechanism of MB in the presence of TiO2/BiVO4 microfibrous photocatalyst was proposed. 展开更多
关键词 TiO2/BiVO4 Microfiber Visible-light-response Photocatalysis
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云母负载TiO_2/BiVO_4复合光催化材料的制备及光催化性能研究 认领 引用 被引量：3
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作者 张绍岩 常永芳 牟微 《化工新型材料》 CAS CSCD 北大核心 2012年第10期21-23,共3页
以云母作为载体,通过液相沉淀法,获得了云母负载TiO2/BiVO4复合光催化材料。紫外-可见漫反射测试表明,该材料在紫外光区和可见光区均具有较强的吸收性能。以罗丹明B作为光催化降解物,研究了云母负载TiO2/Bi-VO4复合光催化材料的光催化... 以云母作为载体,通过液相沉淀法,获得了云母负载TiO2/BiVO4复合光催化材料。紫外-可见漫反射测试表明,该材料在紫外光区和可见光区均具有较强的吸收性能。以罗丹明B作为光催化降解物,研究了云母负载TiO2/Bi-VO4复合光催化材料的光催化性能。结果表明:该材料对罗丹明B染料溶液具有明显的降解作用,循环使用3次,仍能保持良好的催化活性。 展开更多
关键词 云母 TiO2/BiVO4复合 光催化 负载
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可见光响应的BiVO_4/TiO_2纳米复合光催化剂 认领 引用 被引量：23
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作者 嵇天浩 杨芳 +2 位作者 周娇艳 杜海燕 孙家跃 《光谱学与光谱分析》 SCIE EI CAS 北大核心 2010年第7期1944-1947,共4页
通过水热法制备了两种新型纳米复合材料Bi VO4/Ti O2,并对其晶体结构、形貌尺寸及光催化活性进行了测试。X射线粉末衍射测试结果表明,这两种复合材料均是由单斜相Bi VO4和锐钛矿型Ti O2构成;扫描电镜和透射电镜测试结果表明,两种样品均... 通过水热法制备了两种新型纳米复合材料Bi VO4/Ti O2,并对其晶体结构、形貌尺寸及光催化活性进行了测试。X射线粉末衍射测试结果表明,这两种复合材料均是由单斜相Bi VO4和锐钛矿型Ti O2构成;扫描电镜和透射电镜测试结果表明,两种样品均为Bi VO4纳米颗粒负载于Ti O2纳米线上;通过测试紫外-可见吸收光谱可观察到Bi VO4/Ti O2的吸收边相对于纯Ti O2明显发生了红移;在相同实验条件下,对亚甲基蓝的可见光催化降解实验结果表明,由含Bi3+钛酸盐纳米线制备的Bi VO4/Ti O2的光催化活性远高于纯Bi VO4和Ti O2半导体材料。 展开更多
关键词 纳米复合物 BiVO4/TiO2 光催化剂 可见光响应 水热合成
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Rational Design of Photoanodes in Portable Devices to Enhance H2O2 Production for Microenvironment Control 认领 引用
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作者 Haisu Wu Hanliang Fan +4 位作者 Hong Chen Dongxue Jiao Yuanxing Fang Xiaochun Zheng Maokai Xu 《Carbon Energy》 SCIE EI CAS CSCD 2026年第1期48-59,共12页
Hydrogen peroxide(H2O2)is a versatile oxidant with significant applications,particularly in regulating the microenvironment for healthcare purposes.Herein,a rational design of the photoanode is implemented to en... Hydrogen peroxide(H2O2)is a versatile oxidant with significant applications,particularly in regulating the microenvironment for healthcare purposes.Herein,a rational design of the photoanode is implemented to enhance H2O2 production by oxidizing H2O in a portable photoelectrocatalysis(PEC)device.The obtained solution from this system is demonstrated for effective bactericidal activity against Staphylococcus aureus and Escherichia coli,while maintaining low toxicity toward hippocampal neuronal cells.The photoanode is achieved by Mo-doped BiVO4 films,which are subsequently loaded with cobalt-porphyrin(Co-py)molecules as a co-catalyst.As a result,the optimal performance for H2O2 production rate was achieved at 8.4μmol h−1 cm−2,which is 1.8 times that of the pristine BiVO4 photoanode.Density functional theory(DFT)simulations reveal that the improved performance results from a 1.1 eV reduction in the energy of the rate-determining step of·OH adsorption by the optimal photoanode.This study demonstrates a PEC approach for promoting H2O2 production by converting H2O for antibacterial purposes,offering potential applications in conventionally controlling microenvironments for healthcare applications. 展开更多
关键词 antibacterial BiVO4 co-catalysts H2O2production microenvironment photoelectrocatalysis
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TiO_2/BiVO_4复合光催化剂的微波辅助水热法合成及催化性能研究 认领 引用 被引量：6
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作者 郭莉 王丹军 +2 位作者 付峰 强小丹 章峰 《应用化工》 CAS CSCD 2012年第2期259-262,共4页
以硝酸铋和偏钒酸铵为原料,采用微波-辅助水热法合成了BiVO4和TiO2/BiVO4复合光催化剂,借助XRD、UV-Vis和FE-SEM等测试手段对样品进行表征。XRD分析表明,所得BiVO4粉体为单斜晶系,且与TiO2复合后,特征衍射峰宽化,强度降低;FE-SEM显示,... 以硝酸铋和偏钒酸铵为原料,采用微波-辅助水热法合成了BiVO4和TiO2/BiVO4复合光催化剂,借助XRD、UV-Vis和FE-SEM等测试手段对样品进行表征。XRD分析表明,所得BiVO4粉体为单斜晶系,且与TiO2复合后,特征衍射峰宽化,强度降低;FE-SEM显示,所得样品为具有多级结构的球状纳米结构体系;UV-Vis吸收光谱表明,BiVO4粉体和TiO2/BiVO4在400～600 nm的可见光区域对光响应。根据光吸收特性,选择罗丹明B为模型污染物,考察了样品可见光催化活性。结果表明,TiO2/BiVO4相比BiVO4,具有更高的可见光催化活性。 展开更多
关键词 微波辅助水热法 BiVO4 TiO2 可见光催化活性
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Tuning radical generation rate for efficient CH4 photooxidation to CH3OH over AgPd alloy and Co3O4 cascade active sites 认领 引用
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作者 Shuqi Liang Zhen Xiao +2 位作者 Jinni Shen Wenxin Dai Zizhong Zhang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第1期189-199,共11页
The direct conversion of methane into methanol under mild conditions represents a highly appealing pathway.Regulating the generation of hydroxyl radicals(·OH)is a representative method,but excessive release of... The direct conversion of methane into methanol under mild conditions represents a highly appealing pathway.Regulating the generation of hydroxyl radicals(·OH)is a representative method,but excessive release of·OH will inevitably lead to the over-oxidation of CH3OH.Here,we design AgPd alloy and Co3O4 cascade active sites on the TiO2 surface(AgPd-Co/TiO2)to control the release rate of·OH to improve the selectivity of CH3OH.By incorporating Co3O4 as a hole buffer and storage center,the kinetics of·OH generation at the TiO2 interface can be effectively modulated.This confines the spatial distribution of·OH to the active sites of the AgPd alloy,thus facilitating the directional combination of·CH3 and·OH.The optimal AgPd-Co/TiO2 photocatalyst demonstrates outstanding catalytic performance with the selectivity of CH3OH reaching up to 93%in the liquid phase.AgPd-Co/TiO2 exhibited significantly enhanced selectivity relative to reported TiO2-based photocatalytic systems,while simultaneously achieving comparable methanol yields.This research offers valuable insights for the precise design of composite photocatalysts to achieve highly selective methane oxidation. 展开更多
关键词 Methane conversion AgPd alloy Co3O4 TiO2 Photocatalysis
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BiVO4/TiO2(N2) Nanotubes Heterojunction Photoanode for Highly Efficient Photoelectrocatalytic Applications 认领 引用 被引量：8
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作者 Rui Wang Jing Bai +3 位作者 Yunpo Li Qingyi Zeng Jinhua Li Baoxue Zhou 《Nano-Micro Letters》 SCIE EI CAS 2017年第2期14-22,共9页
We report the development of a novel visible response BiVO_4/TiO_2(N_2) nanotubes photoanode for photoelectrocatalytic applications. The nitrogen-treated TiO_2 nanotube shows a high carrier concentration rate, thus re... We report the development of a novel visible response BiVO_4/TiO_2(N_2) nanotubes photoanode for photoelectrocatalytic applications. The nitrogen-treated TiO_2 nanotube shows a high carrier concentration rate, thus resulting in a high efficient charge transportation and low electron–hole recombination in the TiO_2–BiVO_4. Therefore, the BiVO_4/TiO_2(N_2) NTs photoanode enabled with a significantly enhanced photocurrent of 2.73 mA cm-2(at 1 V vs. Ag/Ag Cl) and a degradation efficiency in the oxidation of dyes under visible light. Field emission scanning electron microscopy, X-ray diffractometry, energy-dispersive X-ray spectrometer, and UV–Vis absorption spectrum were conducted to characterize the photoanode and demonstrated the presence of both metal oxides as a junction composite. 展开更多
关键词 BiVO4 TiO2(N2) nanotube Heterojunction Photoelectrocatalytic Degradation of dyes
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One-pot synthesis of peony-like Bi_2S_3/BiVO_4(040) with high photocatalytic activity for glyphosate degradation under visible light irradiation 认领 引用 被引量：9
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作者 Qiang-Yong Tang Rui Huo +3 位作者 Lang-Ying Ou Xiu-Li Luo Yan-Ran Lv Yue-Hua Xu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第4期580-589,M0005,共10页
In this work,samples consisting of BiVO4 with exposed(040)facets coupled with Bi2S3(Bi2S3/BiVO4)were prepared through a one-pot hydrothermal method,using ethylenediaminetetraacetic acid as directing agent and L-cystei... In this work,samples consisting of BiVO4 with exposed(040)facets coupled with Bi2S3(Bi2S3/BiVO4)were prepared through a one-pot hydrothermal method,using ethylenediaminetetraacetic acid as directing agent and L-cysteine as sulfur source and soft template.X-ray diffraction,field emission scanning electron microscopy,and high-resolution transmission electron microscopy measurements indicated that the Bi2S3 content had a significant influence on the growth of(040)and(121)facets as well as on the morphology of the Bi2S3/BiVO4 samples.When the Bi2S3 content reached 1 mmol,the Bi2S3/BiVO4 samples exhibited a peony-like morphology.The results of transient photocurrent tests and electrochemical impedance spectroscopy measurements confirmed that a more effective charge separation and a faster interfacial charge transfer occurred in Bi2S3/BiVO4 than BiVO4.The enhanced photocatalytic activity of the Bi2S3/BiVO4 samples could be attributed to the improved absorption capability in the visible light region and the enhanced electron-hole pair separation efficiency due to the formation of the Bi2S3/BiVO4 heterostructure.In addition,the Bi2S3/BiVO4 samples showed relative stability and reusability.The simple method presented in this work could be used to fabricate composite photocatalysts with high activity for different applications,such as photocatalytic degradation of organic pollutants,photocatalytic splitting of water,and photocatalytic reduction of carbon dioxide. 展开更多
关键词 BiVO4(040) Bi2S3/BiVO4(040) Heterostructure Photocatalytic Glyphosate
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All-solid-state BiVO4/ZnIn2S4 Z-scheme composite with efficient charge separations for improved visible light photocatalytic organics degradation 认领 引用 被引量：7
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作者 Deling Yuan Mengting Sun +5 位作者 Shoufeng Tang Yating Zhang Zetao Wang Jinbang Qi Yandi Rao Qingrui Zhang 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第2期547-550,共4页
Constructing a Z-scheme is a significant approach to improve the separation of photogene rated carriers for effective organic pollutant degradation.Herein,a BiVO4/ZnIn2S4(BZ) Z-scheme composite was successfully synthe... Constructing a Z-scheme is a significant approach to improve the separation of photogene rated carriers for effective organic pollutant degradation.Herein,a BiVO4/ZnIn2S4(BZ) Z-scheme composite was successfully synthesized,and applied to photodegrade methyl orange(MO) irradiated by a LED lamp.Anchoring the BiVO4 on the ZnIn2S4 nanoparticles promoted the separation of photogenerated electronholes and broadened the light response range.The detailed characterizations,including surface morphology,elements valence state,and photocurrent performance,demonstrated that the enhanced separation of photogenerated carriers was the pivotal reason for the enhanced photocatalysis reaction.Benefiting from the excellent photocatalytic characteristics,the 5% mass ratio of BZ composite presented the highest MO degradation rate of 0.00997 min^-1,which was 1.9 and 10.3 times greater than the virgin ZnIn2S4 and BiVO4,respectively.Furthermore,the BZ hybrid materials indicated a well photo-stability in the four recycling tests. 展开更多
关键词 Z-scheme composite BiVO4 ZnIn2S4 Visible light photocatalysis Charge separation Organic pollutant degradation
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TiO_2/BiVO_4复合光催化剂的水热法合成及其光催化性能研究 认领 引用 被引量：5
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作者 李家贵 韦庆敏 +1 位作者 罗志辉 朱万仁 《材料导报》 CAS CSCD 北大核心 2014年第10期46-49,共4页
以Bi（NO3）3·5H2O和NH4 VO3为原料,采用水热法合成了BiVO4和TiO2/BiVO4复合光催化剂,借助XRD、SEM、UV-Vis、IR等测试手段对样品进行了表征。XRD分析表明,所得BiVO4为单斜晶系结构,与TiO2复合后,特征衍射峰窄化,强度略增;SEM显示,... 以Bi（NO3）3·5H2O和NH4 VO3为原料,采用水热法合成了BiVO4和TiO2/BiVO4复合光催化剂,借助XRD、SEM、UV-Vis、IR等测试手段对样品进行了表征。XRD分析表明,所得BiVO4为单斜晶系结构,与TiO2复合后,特征衍射峰窄化,强度略增;SEM显示,BiVO4样品呈现规整的多边立方体形貌,TiO2/BiVO4粉体为规整球状形貌。UV-Vis紫外可见光谱表明,BiVO4和TiO2/BiVO4在400～700nm的可见光区域对光响应。根据光吸收特性,选择亚甲基蓝为模拟污染物,考察了样品的光催化活性。结果表明,与BiVO4相比,TiO2/BiVO4具有更高的可见光催化降解活性,催化降解亚甲基蓝的降解率达到95.9％。 展开更多
关键词 TiO2 BiVO4 水热法 光催化性能
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Construction of 2D Zn‐MOF/BiVO4S‐scheme heterojunction for efficient photocatalytic CO2 conversion under visible light irradiation 认领 引用 被引量：14
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作者 Zhenlong Zhao Ji Bian +6 位作者 Lina Zhao Hongjun Wu Shuai Xu Lei Sun Zhijun Li Ziqing Zhang Liqiang Jing 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2022年第5期1331-1340,共10页
The construction of S‐scheme heterojunction photocatalysts has been regarded as an effective avenue to facilitate the conversion of solar energy to fuel.However,there are still considerable challenges with regard to ... The construction of S‐scheme heterojunction photocatalysts has been regarded as an effective avenue to facilitate the conversion of solar energy to fuel.However,there are still considerable challenges with regard to efficient charge transfer,the abundance of catalytic sites,and extended light absorption.Herein,an S‐scheme heterojunction of 2D/2D zinc porphyrin‐based metal‐organic frameworks/BiVO4nanosheets(Zn‐MOF/BVON)was fabricated for efficient photocatalytic CO2conversion.The optimal one shows a 22‐fold photoactivity enhancement when compared to the previously reported BiVO4 nanoflake(ca.15 nm),and even exhibits~2‐time improvement than the traditional g‐C3N4/BiVO4 heterojunction.The excellent photoactivities are ascribed to the strengthened S‐scheme charge transfer and separation,promoted CO2activation by the well‐dispersed metal nodes Zn2(COO)4in the Zn‐MOF,and extended visible light response range based on the results of the electrochemical reduction,electron paramagnetic resonance,and in‐situ diffuse reflectance infrared Fourier transform spectroscopy.The dimension‐matched Zn‐MOF/BVON S‐scheme heterojunction endowed with highly efficient charge separation and abundant catalytic active sites contributed to the superior CO2 conversion.This study offers a facile strategy for constructing S‐scheme heterojunctions involving porphyrin‐based MOFs for solar fuel production. 展开更多
关键词 BiVO4 nanosheet 2D zinc porphyrin‐based MOFs modification S‐scheme heterojunction Visible light catalysis CO2 conversion
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原位钼修饰TiO_2/BiVO_4异质结薄膜的制备及其光电化学性能 认领 引用
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作者 牛学恒 白晶 +1 位作者 李金花 周保学 《复旦学报（自然科学版）》 CAS CSCD 北大核心 2018年第2期215-222,共8页
针对TiO_2可见光响应能力不足、BiVO_4光生电子空穴分离能力弱的问题,制备了一种基于钼原位掺杂BiVO_4修饰TiO_2纳米管的高性能Mo-BiVO_4/TiO_2异质结光阳极.实验结果表明,钼掺杂后异质结电极材料的吸收带边约510nm,光电流密度在1.23Vvs... 针对TiO_2可见光响应能力不足、BiVO_4光生电子空穴分离能力弱的问题,制备了一种基于钼原位掺杂BiVO_4修饰TiO_2纳米管的高性能Mo-BiVO_4/TiO_2异质结光阳极.实验结果表明,钼掺杂后异质结电极材料的吸收带边约510nm,光电流密度在1.23Vvs.RHE偏压下达到1.48mA/cm2,与未掺杂钼的TiO_2/BiVO_4光电极相比,Mo-BiVO_4/TiO_2光阳极的光电转化效率提高了近50%,光电流密度提高了近2.5倍,光转化效率在0.95Vvs.RHE偏压下提高了2倍,且电极的稳定性较好. 展开更多
关键词 TiO2/BiVO4 异质结 原位修饰 钼
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TiO2-Pt-BiVO4复合催化剂制备及降解染料的性能研究 认领 引用 被引量：2
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作者 初义聪 邱月 +2 位作者 袁星 吴琼 路莹 《西北师范大学学报（自然科学版）》 CAS 北大核心 2019年第4期70-76,共7页
采用液相沉积法、光还原法和金属有机物分解法设计制备了TiO2-Pt-BiVO4复合催化剂,并将其用于典型染料罗丹明B(RhB)的降解研究,考察其在模拟太阳光下的光催化活性.通过X-射线衍射(XRD)、X-射线光电子能谱(XPS)、扫描电子显微镜(SEM)、紫... 采用液相沉积法、光还原法和金属有机物分解法设计制备了TiO2-Pt-BiVO4复合催化剂,并将其用于典型染料罗丹明B(RhB)的降解研究,考察其在模拟太阳光下的光催化活性.通过X-射线衍射(XRD)、X-射线光电子能谱(XPS)、扫描电子显微镜(SEM)、紫外-可见分光光度计(UV-visDRS)等仪器对催化剂的晶型、表面形貌、元素组成以及光吸收特性进行分析.通过一系列实验,确定TiO2-Pt-BiVO4复合催化剂光催化降解罗丹明B的最佳实验条件为:光还原法沉积Pt使用的氯铂酸浓度为5μmol L^-1,BiVO4涂覆层数为1,罗丹明B初始浓度为5mg L^-1,反应体系pH值为3.此时,TiO2-Pt-BiVO4复合催化剂表现出最强的光催化活性,降解效率达到96.3%,动力学常数是纯TiO2的6.03倍,3次循环利用后降解效率仍可达到90%.本研究可为光催化氧化技术处理染料类废水的实际应用提供基础数据和技术支持. 展开更多
关键词 光催化 TiO2-Pt-BiVO4 罗丹明B 降解
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TiO_2-BiVO_4异质结复合材料的制备及其在光电化学生物传感器中的应用 认领 引用 被引量：3
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作者 刘培培 唐云飞 +1 位作者 徐俊 刘小强 《化学研究》 CAS 2018年第1期79-83,共5页
以异丙醇钛为钛源,采用溶胶-凝胶法(Sol-Gel)制备二氧化钛(TiO_2)微球,然后以水热法制备出TiO_2微球与钒酸铋(BiVO_4)的异质结复合纳米材料,通过X射线衍射(XRD)、扫描电子显微镜(SEM)和X射线光电子能谱(XPS)对复合纳米材料进行表征.并... 以异丙醇钛为钛源,采用溶胶-凝胶法(Sol-Gel)制备二氧化钛(TiO_2)微球,然后以水热法制备出TiO_2微球与钒酸铋(BiVO_4)的异质结复合纳米材料,通过X射线衍射(XRD)、扫描电子显微镜(SEM)和X射线光电子能谱(XPS)对复合纳米材料进行表征.并利用时间-电流(I-T)曲线研究了材料的光电性能.由于BiVO_4的禁带间隙较窄,从而提高了所得复合材料在可见光区的光电性能.将所制备的TiO_2-BiVO_4异质结作为支架负载葡萄糖氧化酶(GOx),进而制备出光电化学葡萄糖传感器,该传感器表现出良好的灵敏度,其线性范围为0.05~8mmol/L,检测限为0.02 mmol/L. 展开更多
关键词 水热法 二氧化钛 钒酸铋 葡萄糖 光电化学生物传感器
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Synergy of charge migration direction-manipulated Z-scheme heterojunction of BiVO4quantum dots/perylenetetracarboxylic acid and nanosized Au modification for artificial H2O2photosynthesis 认领 引用
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作者 Teng Liang Yutong Li +5 位作者 Shuai Xu Yuxin Yao Rongping Xu Ji Bian Ziqing Zhang Liqiang Jing 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2024年第7期277-286,共10页
Herein,perylenetetracarboxylic acid(PTA)nanosheets with anisotropic charge migration driven by the formed internal electric fields are synthesized through a facile hydrolysis-reassembly process.Strategically,a Z-schem... Herein,perylenetetracarboxylic acid(PTA)nanosheets with anisotropic charge migration driven by the formed internal electric fields are synthesized through a facile hydrolysis-reassembly process.Strategically,a Z-scheme heterojunction with free-flowing interfacial charge transfer and spatially separated redox centers is constructed based on the distinct photogenerated electrons and holes accumulation regions of PTA nanosheets by in-situ introducing BiVO4quantum dots(BQD)and nanosized Au.The optimized BQD/PTA-Au exhibits a ca.6.4-fold and 4.8-fold enhancement in H2O2production rate and apparent quantum yield at 405 nm compared with pristine PTA,respectively.The exceptional activities are attributed to the cascade Z-scheme charge transfer followed the matched charge migration orientation,as well as the Au active sites for accelerating 2e-oxygen reduction pathway induced by superoxide radicals,as unraveled by electron paramagnetic resonance,in-situ irradiated X-ray photoelectron spectroscopy and in-situ diffuse reflectance infrared Fourier transformation spectroscopy.This work provides a strategy to design an efficient Z-scheme system towards solar-driven H2O2production. 展开更多
关键词 Z-scheme heterojunction Perylenetetracarboxylic acid BiVO4 quantum dots H2O2photosynthesis Oxygen reduction
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TiO2、BiVO4、Cu2O光催化降解低浓度甲醛 认领 引用 被引量：3
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作者 温惠敏 衣守志 +1 位作者 裴丽丽 徐红彬 《环境工程学报》 CAS CSCD 北大核心 2017年第5期2940-2945,共6页
比较研究了3种(TiO_2,BiVO_4,Cu_2O)光催化剂对低浓度甲醛的降解过程,拟通过结构分析(晶粒尺寸、比表面积、禁带宽度)和实验评价其性能优劣,优选出光催化性能较好的材料。通过结构分析和降解甲醛实验发现,甲醛初始浓度较低时,BiVO_4降... 比较研究了3种(TiO_2,BiVO_4,Cu_2O)光催化剂对低浓度甲醛的降解过程,拟通过结构分析(晶粒尺寸、比表面积、禁带宽度)和实验评价其性能优劣,优选出光催化性能较好的材料。通过结构分析和降解甲醛实验发现,甲醛初始浓度较低时,BiVO_4降解率优于其他,随甲醛浓度增加,催化剂降解率均呈上升趋势,TiO_2-1(T-1)、TiO_2-2(T-2)降解率增加显著。随环境湿度增大,降解率先上升后下降,BiVO_4-1(B-1)、BiVO_4-2(B-2)降解率下降的较为缓慢。同一物质当晶粒尺寸越小比表面积越大,其降解率越好。T-2比B-1有更好的稳定性。分析认为在较低甲醛浓度时,决定光催化降解率的主要因素是催化剂的表面反应速率。随着甲醛初始浓度的增加,吸附脱附成为主要限制步骤。随环境湿度增加,甲醛降解率先上升后下降,具有较小比表面积的BiVO_4降解甲醛效率下降不显著。连续的工作产生甲醛分解副产物,不易堵塞具有大比表面积的T-2的活性位点,所以T-2有更好的稳定性。 展开更多
关键词 光催化活性 甲醛 TiO2 BiVO4 Cu2O 比表面积
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BiVO4/TiO2广谱光催化剂的合成及光催化性能 认领 引用
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作者 王美 李文军 《廊坊师范学院学报（自然科学版）》 2020年第3期41-46,共6页
用低温溶胶-凝胶法,合成了BiVO4/TiO2系列复合光催化剂。采用X射线衍射、比表面积、紫外-可见漫反射光谱和荧光发射光谱对样品进行表征,用模拟太阳光降解亚甲基蓝评价复合光催化剂的催化活性。结果表明:复合光催化剂在480-800nm的可见... 用低温溶胶-凝胶法,合成了BiVO4/TiO2系列复合光催化剂。采用X射线衍射、比表面积、紫外-可见漫反射光谱和荧光发射光谱对样品进行表征,用模拟太阳光降解亚甲基蓝评价复合光催化剂的催化活性。结果表明:复合光催化剂在480-800nm的可见光范围具有较强的吸收峰,当BiVO4的质量分数为30%时,呈现出最好的光谱吸收性能;BiVO4与TiO2之间形成的异质结,能快速捕获并迁移电子,有效地提高光生电子-空穴的分离效率,从而提高其光催化活性。 展开更多
关键词 BiVO4/TiO2 广谱 溶胶-凝胶法 光催化
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可见光响应的LaVO_4/TiO_2纳米管的合成、表征及对气相甲苯的光催化性能 认领 引用 被引量：8
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作者 邹学军 李新勇 +1 位作者 肇启东 陈国华 《高等学校化学学报》 SCIE CAS CSCD 北大核心 2012年第5期1046-1049,共4页
通过水热方法合成了可见光响应的LaVO4/TiO2纳米管,采用XRD,TEM,氮气吸附-脱附以及表面光电压谱对样品进行了表征.以气相甲苯为典型污染物,研究了制备样品在可见光(λ>420 nm)条件下的光催化性能.实验结果表明,LaVO4的复合使TiO2的... 通过水热方法合成了可见光响应的LaVO4/TiO2纳米管,采用XRD,TEM,氮气吸附-脱附以及表面光电压谱对样品进行了表征.以气相甲苯为典型污染物,研究了制备样品在可见光(λ>420 nm)条件下的光催化性能.实验结果表明,LaVO4的复合使TiO2的粒径减小,比表面积增大,光响应范围向可见光偏移.光催化实验结果表明,在可见光条件下,LaVO4/TiO2纳米管降解甲苯的效率比其它样品高,与纯TiO2纳米管相比,降解效率提高了47%. 展开更多
关键词 甲苯 LaVO4/TiO2纳米管 水热方法 光催化
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Ag_2CO_3/BiVO_4复合微米片光催化剂的制备、表征及光催化机理 认领 引用 被引量：17
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作者 刘仁月 吴榛 +4 位作者 白羽 余长林 李家徳 舒庆 杨凯 《无机化学学报》 SCIE CAS CSCD 北大核心 2017年第3期519-527,共9页
采用水热法制备粒径为1~2μm的BiVO_4微米片,然后在微米片表面沉积不同含量的Ag_2CO_3颗粒,制备Ag_2CO_3/BiVO_4复合微米片光催化剂。利用X射线粉末衍射(XRD)、扫描电镜(SEM)、红外光谱(FTIR)、紫外-可见漫反射光谱(UV-Vis DRS)、光致发... 采用水热法制备粒径为1~2μm的BiVO_4微米片,然后在微米片表面沉积不同含量的Ag_2CO_3颗粒,制备Ag_2CO_3/BiVO_4复合微米片光催化剂。利用X射线粉末衍射(XRD)、扫描电镜(SEM)、红外光谱(FTIR)、紫外-可见漫反射光谱(UV-Vis DRS)、光致发光(PL)光谱、瞬态光电流-时间响应对催化剂进行表征。以可见光为光源,罗丹明B为降解对象进行光催化活性测试。结果表明,复合适量Ag_2CO_3有利于提高光催化剂的比表面积,改善催化剂的表面性能。活性测试结果表明,当复合10%(w/w)Ag_2CO_3时,Ag_2CO_3/BiVO_4光催化活性最佳,比纯BiVO_4提高4.4倍。光致发光(PL)光谱、瞬态光电流-时间响应测试结果表明,复合Ag_2CO_3能有效抑制光生电子与空穴的复合。自由基捕获实验结果表明,该体系的活性氧物质为空穴和羟基自由基。Ag_2CO_3/BiVO_4复合光催化剂活性提高的原因,是较宽带隙的Ag_2CO_3与较窄带隙的BiVO_4形成的异质结有效抑制了光生电子与空穴的复合,同时两者适宜的能带结构保证产生更多的空穴,从而具有更强的氧化能力。 展开更多
关键词 BiVO4微米片 异质结 可见光 Ag2CO3 空穴
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Sulfur-doped g-C3N4/TiO2 S-scheme heterojunction photocatalyst for Congo Red photodegradation 认领 引用 被引量：76
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作者 Juan Wang Guohong Wang +2 位作者 Bei Cheng Jiaguo Yu Jiajie Fan 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第1期56-68,共13页
Constructing step-scheme(S-scheme)heterojunctions has been confirmed as a promising strategy for enhancing the photocatalytic activity of composite materials.In this work,a series of sulfur-doped g-C3N4(SCN)/TiO2 S-sc... Constructing step-scheme(S-scheme)heterojunctions has been confirmed as a promising strategy for enhancing the photocatalytic activity of composite materials.In this work,a series of sulfur-doped g-C3N4(SCN)/TiO2 S-scheme photocatalysts were synthesized using electrospinning and calcination methods.The as-prepared SCN/TiO2 composites showed superior photocatalytic performance than pure TiO2 and SCN in the photocatalytic degradation of Congo Red(CR)aqueous solution.The significant enhancement in photocatalytic activity benefited not only from the 1D well-distributed nanostructure,but also from the S-scheme heterojunction.Furthermore,the XPS analyses and DFT calculations demonstrated that electrons were transferred from SCN to TiO2 across the interface of the SCN/TiO2 composites.The built-in electric field,band edge bending,and Coulomb interaction synergistically facilitated the recombination of relatively useless electrons and holes in hybrid when the interface was irradiated by simulated solar light.Therefore,the remaining electrons and holes with higher reducibility and oxidizability endowed the composite with supreme redox ability.These results were adequately verified by radical trapping experiments,ESR tests,and in situ XPS analyses,suggesting that the electron immigration in the photocatalyst followed the S-scheme heterojunction mechanism.This work can enrich our knowledge of the design and fabrication of novel S-scheme heterojunction photocatalysts and provide a promising strategy for solving environmental pollution in the future. 展开更多
关键词 TiO2 nanofiber Sulfur-doped g-C3N4 Step-scheme heterojunction photocatalysis In situ XPS S-scheme mechanism
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