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Light-Induced Dynamic Stability of Oxygen Vacancies in BiSbO_(4) for Efficient Photocatalytic formaldehyde degradation

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Energy & Environmental Materials 2022年第1期5卷 305-312页

作者： Maoxi Ran Wen Cui Kanglu Li Lvcun Chen Yuxin Zhang Fan Dong Yanjuan Sun Chongqing Key Laboratory of Catalysis and New Environmental Materials College of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China School of Resources and Environment Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731China The Center of New Energy Materials and Technology School of New Energy and MaterialsSouthwest Petroleum UniversityChengdu 610500China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China State Centre for International Cooperation on Designer Low-carbon and Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

Defect engineering has been regarded as a versatile strategy to maneuver the photocatalytic ***,there are a few studies concerning how to maintain the stability of defects,which is important to ensure sustainable photocatalytic ***,a novel strategy to modulate the structural properties of BiSbO_(4)using light-induced dynamic oxygen vacancies is reported by us for efficient and stable photocatalytic oxidation of ***,the continuous consumption and replenishment of vacancies(namely dynamic vacancies)ensure the dynamic stability of oxygen vacancies,thus guaranteeing the excellent photocatalytic *** oxygen vacancies could also accelerate the electron migration,inhibit the photogenerated electron/hole recombination,widen the light absorption spectra,and thus improve the photocatalytic formaldehyde removal *** with the results of in situ DRIFTS,the reaction mechanism for each step of formaldehyde oxidation is *** supported by DFT calculation of Gibbs free energy,the introduction of oxygen vacancies into BiSbO_(4)can promote spontaneous process of formaldehyde *** work highlights a promising approach for stabilizing the defects and proposes the photocatalytic reaction mechanism in combination with the thermodynamic functions.

关键词： dynamic stability formaldehyde degradation oxygen vacancy photocatalysis reaction mechanism

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Preparation of nano-TiO_2/diatomite-based porous ceramics and their photocatalytic kinetics for formaldehyde degradation

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International Journal of Minerals,Metallurgy and Materials 2018年第1期25卷 73-79页

作者： Ru-qin Gao Qian Sun Zhi Fang Guo-ting Li Meng-zhe Jia Xin-mei Hou School of Environmental Science and Engineering North China University of Water Resources and Electric Power Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing

Diatomite-based porous ceramics were adopted as carriers to immobilize nano-TiO2 via a hydrolysis-deposition technique. The thermal degradation of as-prepared composites was investigated using thermogravimetric-differential thermal analysis, and the phase and microstructure were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and transmission electron microscopy. The results indicated that the carriers were encapsulated by nano-TiO2 with a thickness of 300-450 nm. The main crystalline phase of TiO2 calcined at 650~C was anatase, and the average grain size was 8.3 nm. The FT-IR absorption bands at 955.38 cm1 suggested that new chemical bonds among Ti, O, and Si had formed in the composites. The photocatalytic （PC） activity of the composites was investigated un- der UV irradiation. Furthermore, the photodegradation kinetics of formaldehyde was investigated using the composites as the cores of an air cleaner. A kinetics study showed that the reaction rate constants of the gas-phase PC reaction of formaldehyde were k = 0.576 mg＇m3·min^-1 and K = 0.048 m3/mg.

关键词： nano titanium dioxide/diatomite porous ceramics hydrolysis precipitation photocatalytic activity kinetic equation formaldehyde degradation

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