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Visible light assisted enzyme-photocatalytic cascade degradation of organophosphorus pesticides

Green Chemical Engineering 2023年第1期4卷 30-38页

作者： Ying Zhang Xue Cao Yufeng Yang Sumin Guan Xiaotian Wang Heyu Li Xiaobing Zheng Liya Zhou Yanjun Jiang Jing Gao School of Chemical Engineering and Technology Hebei University of TechnologyTianjin300130China Hebei Xinlan Environmental Protection Engineering Co.Ltd. Baoding071000China Tianjin UBasio Biotechnology Group Co. Ltd.Tianjin300457China National Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization Hebei University of TechnologyTianjin300130China

The worldwide application of organophosphorus pesticides(OPs)has promoted agricultural development,but their gradual accumulation in soil and water can seriously affect the central nervous system of humans and other mammals.Organophosphorus hydrolase(OPH)is an effective enzyme that can catalyze the degradation of the residual OPs.However,the degradation products such as p-nitrophenol(p-NP)is still toxic.Thus,it is of great significance to develop a multi-functional support that can be simultaneously used for the immobilization of OPH and the further degradation of p-NP.Herein,a visible light assisted enzyme-photocatalytic integrated catalyst was constructed by immobilizing OPH on hollow structured Au-TiO_(2)(named OPH@H-Au-TiO_(2))for the degradation of OPs.The obtained OPH@H-Au-TiO_(2)can degrade methyl parathion to p-NP by OPH and then degrade p-NP to hydroquinone with low toxicity by using H-Au-TiO_(2)under visible light.OPH molecules were immobilized on HAu-TiO_(2)through adsorption method to prepare OPH@H-Au-TiO_(2).After 2.5 h of reaction,methyl parathion is completely degraded,and about 82.64%of the generated p-NP is further degraded into hydroquinone.After reused for 4 times,the OPH@H-Au-TiO_(2)retains more than 80%of the initial degradation activity.This research presents a new insight in designing and constructing multi-functional biocatalyst,which greatly expands the application scenarios and industrial value of enzyme catalysis.

关键词： Organophosphorus pesticides multi-functional biocatalyst Enzyme-photocatalytic cascade catalyst Immobilized enzyme Organophosphorus hydrolase

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