The creation of an environmentally friendly synthesis method for silver nanomaterials(Ag-NPs)is an urgent concern for sustainable nanotechnology development.In the present study,a novel straightforward and green method for the preparation of silver nanoparti-cle/reduced graphene oxide(AgNP/rGO)composites was successfully developed through the combination of phytosynthesis,continuous flow synthesis and microwave-assistance.Oriental persimmon(Diospyros kaki Thunb.)extracts were used as both plant reducing and capping agents for fast online synthesis of AgNP/rGO composites.The experimental param-eters were optimized and the morphologies of the prepared materials were investigated.The characterization results reveal that spherical AgNPs were quickly synthesized and uni-formly dispersed on rGO sheets using the proposed online system.Fourier transform in-frared spectroscopy analysis confirmed that phenols,flavonoids,and other substances in the plant extracts played a decisive role in the synthesis of AgNP/rGO composites.Using sodium borohydride(NaBH4)degradation of p-nitrophenol(4-NP)as a model,the catalytic activity of the prepared AgNP/rGO materials was evaluated.The complete degradation of 4-NP was achieved within 12 min through the use of AgNP/rGO materials,and the compos-ite had a much better catalytic activity than the bare AgNPs and rGO had.Compared with the conventional chemical method,our online method is facile,fast,cost-efficient,and en-vironmentally friendly.

Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control,Department of Environmental Science&Engineering,North China Electric Power University,Baoding 071000,China;Wetland Research Center for Baiyangdian Lake,North China Electric Power University,Baoding 071000,China;State Key Laboratory of Environmental Chemistry and Ecotoxicology,Research Center for Eco-Enuironmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;School of Civil and Environmental Engineering,Georgia Institute of Technology,Atlanta,GA 30332,USA

[1]Houyu Wang;Chun-Gang Yuan;Chenchen Liu;Xuelei Duan;Qi Guo;Yiwen Shen;Jingfu Liu;Yongsheng Chen-.Microwave-assisted continuous flow phytosynthesis of silver nanoparticle/reduced graphene oxide composites and related visible light catalytic performance)[J].环境科学学报（英文版）,2022(05):286-293

phytosynthesis,persimmon,vironmentally

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