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Recent advances in bismuth-based photocatalysts:environment and energy applications

Green Energy & environment 2023年第5期8卷 1232-1264页

作者： Sijia Song Zipeng Xing Huanan Zhao Zhenzi Li Wei Zhou Department of environmental Science School of Chemistry and Materials ScienceKey Laboratory of Functional Inorganic Material ChemistryMinistry of Education of the People's Republic of ChinaHeilongjiang UniversityHarbin150080China Shandong Provincial Key Laboratory of Molecular Engineering School of Chemistry and Chemical EngineeringQilu University of Technology(Shandong Academy of Sciences)Jinan250353China

Photocatalysis is an effective way to solve the problems of environmental pollution and energy shortage.Numerous photocatalysts have been developed and various strategies have been proposed to improve the photocatalytic performance.Among them,Bi-based photocatalysts have become one of the most popular research topics due to their suitable band gaps,unique layered structures,and physicochemical properties.In this review,Bi-based photocatalysts(BiOX,BiVO_(4),Bi_(2)S_(3),Bi_(2)MoO_(6),and other Bi-based photocatalysts)have been summarized in the field of photocatalysis,including their applications of the removal of organic pollutants,hydrogen production,oxygen production etc.The preparation strategies on how to improve the photocatalytic performance and the possible photocatalytic mechanism are also summarized,which could supply new insights for fabricating high-efficient Bi-based photocatalysts.Finally,we summarize the current challenges and make a reasonable outlook on the future development direction of Bi-based photocatalysts.

关键词： Photocatalysis Bismuth based photocatalyst Hydrogen evolution Solar fuel energy environment remediation

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Efficient piezocatalytic activation of peroxydisulfate over Bi_(2)Fe_(4)O_(9):thickness-dependent synergy effect between peroxydisulfate activation and piezocatalysis

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Rare Metals 2023年第12期42卷 4005-4014页

作者： Chuang-Jian Su Chao-Lin Li Wen-Hui Wang School of Civil and environmental Engineering Harbin Institute of TechnologyShenzhen 518055China State Key Laboratory of Urban Water Resource and environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China

Piezocatalytic activation of persulfate(PS) has great application potential in environmental remediation;however,the relationship between piezocatalyst thickness and catalytic activity is not clear,limiting the further improvement of catalytic activity and application of the technology.Herein,the Bi_(2)Fe_(4)O_(9)(BFO) piezocatalysts with tunable thickness were prepared through a facile hydrothermal method by tuning the molar ratio of Bi(NO_(3)),5H_(2)O and FeCl_(3)·6H_(2)O for piezocatalytic activation of peroxydisulfate(PDS).The BFO with the smallest thickness exhibits excellent catalytic activity,and the SO_(4)^(·-)and ·OH are the major reactive oxygen species for degrading organic pollutants.Further XPS investigations and finite element analyses demonstrate that the decreased thickness of BFO not only exposes more Fe^(2+)sites for PDS activation,but also improve the piezoelectric effect to accelerate the regeneration of Fe^(2+),thus enabling an enhanced synergy effect between PDS activation and piezocatalysis for outstanding catalytic activity.This work provides an understanding of the relationship between thickness of piezocatalysts and its catalytic activity over PDS activation,facilitating the development of more efficient piezocatalysts and PS-based advanced oxidation processes.

关键词： Bi_(2)Fe_(4)O_(9)(BFO)piezocatalyst Active sites Piezocatalytic activation Peroxydisulfate(PDS) Reactive oxygen species environment remediation

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Transparent Coating with TiO2 Nanorods for High-performance Photocatalytic Self-cleaning and environmental remediation

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Chemical Research in Chinese Universities 2020年第6期36卷 1097-1101页

作者： JIANG Wenshuai ZONG Xupeng WANG Xiayan SUN Zaicheng Center of Excellence for environmental Safety and Biological Effects Beijing Key Laboratory for Green Catalysis and SeparationDepartment of Chemistry and BiologyBeijing University of TechnologyBeijing 100124P.R.China

High-performance self-cleaning coatings are highly desired by the industry and market.Herein,we synthesized two kinds of ultrafine TiO2 nanocrystals,one is anatase dots with a diameter of 5 nm,and the other is rutile rods with 1.5 nm in width and 7 nm in length.The prepared TiO:nanocrystal is highly dispersed and stable in water over a month.The coating can be fabricated via a simple spraving method,displaying excellent optical properties and photocatalytic performance on self-cleaning and surrounding environment remediation.The transmittance of glass remains 80%-90%for visible and near-infrared light after 30 cycles of spray.RhB solution(50 mg/L)was applied to the coating surface and form a solid RhB layer was formed,which can be completely removed in 30 min's light irradiation.RhB aqueous solution(100 mL,5 mg/L)was purified after 180 min by a 10 cm×10 cmglass,on which the coating was sprayed 30 times.The concentrations of formaldehyde and PM2.5 in surrounding air displayed a significant decrease along 50 min's monitoring.This high-performance coating shows great potential for constructing functional coating on various substrates for industrial applications.

关键词： TiO2 Photocatalysis Transparent coating Self-cleaning environment remediation

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Bifunctional copper modified graphitic carbon nitride catalysts for efficient tetracycline removal:Synergy of adsorption and photocatalytic degradation

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Chinese Chemical Letters 2020年第10期31卷 2789-2794页

作者： Huijing Wang Jun Zhang Pu Wang Linlin Yin Yu Tian Junjing Li State Key Laboratory of Urban Water Resources and environment(SKLUWRE) School of EnvironmentHarbin Institute of TechnologyHarbin 150090China State Key Laboratory of Separation Membranes and Membrane Processes School of Environmental and Chemical EngineeringTianjin Polytechnic UniversityTianjin 300387China

In order to efficiently re move tetracycline in wastewater through the synergistic effect of adsorption and photocatalytic degradatio n,a series of novel composite materials(Cu doped g-C_(3)N_(4))were synthesized by two-pot hydrothermal method.It was found that the composite materials with optimized ratio(Cu/CN-1)displayed outstanding adsorption and photocatalytic performance as compared with pure g-C_(3)N_(4) photocatalyst.The removal efficiency of tetracycline(TC,50 mg/L)reached almost 99%within 30 min by Cu/CN-1 through the synergy of adsorption and photocatalysis under visible-light irradiation,which was the highest re moval efficiency ever reported.The adsorption kinetics and isotherms of TC on the Cu/CN-1 were well fitted with the pseudo-second-order kinetic model and Langmuir model,respectively.Moreover,it was confirmed that the main effective reactive groups were O_(2)^·and h^(+) in photocatalytic process.The Cu/CN-1 exhibited high stability and excellent reusability after five cycle experiments.Finally,the mechanism of synergy between Cu and g-C_(3)N_(4) was proposed:on the one hand,the decoration of Cu particles significantly increased the adsorption sites of Cu/CN-1 to tetracycline,on the other hand,the modification of Cu particles effectively inhibits charge recombination and broadens the visible light absorption range of the photocatalyst.This study provided a promising photocatalyst to be used for TC removal in the actual wastewater.

关键词： Carbon nitride Tetracycline Adsorption Photocatalysis environment remediation

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