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photodegradation mechanism of two dyes: the influence of adsorption behavior on the novel TiO_2 particles

Journal of Environmental Sciences 2004年第2期16卷 328-331页

作者： LIWei WANGYi-zhong StateKeyLaboratoryofEnvironmentalAquaticChemistry ResearchCenterforEco-EnvironmentalSciencesChineseAcademyofSciencesBeijing100085China.

The relationship between adsorption behavior and photocatalytic mechanism of the two dyes was investigated. Adsorption isotherms showed that the adsorption of cationic pink FG was Langmuir type behavior, while the reactive brilliant red k-2G was Freundlich type behavior. The increasing pH favored the adsorption of FG but have little effect on the photodegradation. The increasing pH favored the adsorption and the photodegradation of k-2G. The presence of scavenger of h + vb and OH· radical potassium iodide inhibited the degradation of k-2G, free radicals scavenger tetranitromethane inhibited the photodegradation of FG. These results indicated that the photodegradation of FG mainly via free radicals in solution, and the photodegradation of k-2G was mainly on the catalysts surface or near the interface of solid and solution by react with h + vb and surface-bound OH·. The different effect of SO 2- 4, HCO - 3 on the adsorp tion and photodegradation of two dyes confirmed these results.

关键词： photodegradation mechanism adsorption behavior dye

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Construction of immobilized films photocatalysts with CdS clusters decorated by metal Cd and BiOCl for photocatalytic degradation of tetracycline antibiotics

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Chinese Chemical Letters 2022年第8期33卷 3705-3708页

作者： Jiajia Li Ziwei Zhao Zhuoning Li Huijuan Yang Shijun Yue Yuping Tang Qizhao Wang Key Laboratory of Shaanxi Administration of Traditional Chinese Medicine for TCM Compatibility and State Key Laboratory of Research&Development of Characteristic Qin Medicine Resources(Cultivation)and Shaanxi Key Laboratory of Chinese Medicine Fundamentals and New Drugs Researchand Shaanxi Collaborative Innovation Center of Chinese Medicinal Resources IndustrializationShaanxi University of Chinese MedicineXianyang 712046China School of Water and Environment Chang'an UniversityXi'an 710064China College of Chemistry and Chemical Engineering Northwest Normal UniversityLanzhou 730070China Institute of Advanced Electrochemical Energy School of Materials Science and Engineering Xi'an University of Technologyand Shaanxi International Joint Research Centre of Surface Technology for Energy Storage MaterialsXi'an 710048China

A kind of CdS/Cd-BiOCl immobilized films photocatalyst was prepared.The optical and physicochemical properties of the CdS/Cd-BiOCl photocatalysts were analysed,and the detailed characterization revealed CdS/Cd-BiOCl films photocatalyst with good charge carrier separation effect.The reusabilities and photocatalytic properties of the samples were studied.The 15%Cd S/Cd-Bi OCl photocatalyst exhibited superior performance in photocatalytic degradation of tetracycline(TC)and favorable stability under visible light irradiation.As for the photodegradation rate of TC,15%CdS/Cd-BiOCl exhibited an excellent photodegradation activity,which is 4.06 and 9.53 times higher than that of Cd S/Cd and Bi OCl,respectively.The results showed that dominant active species are·O_(2)^(-)and·OH radicals during photodegradation.The charge transfer in Z-scheme CdS/Cd-BiOCl films photocatalyst could synchronously generate conduct band(CB)electrons in BiOCl and valence band(VB)holes in CdS,and metal Cd served as electron mediator.This work can be a reference for the design of film photocatalysts and new insight for photodegradating towards contaminants.

关键词： CdS/Cd-BiOCl immobilized films photocatalyst photodegradation mechanism Environmental remediation Charge separation Tetracycline

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