1. Microwave-assisted continuous flow phytosynthesis of silver nanoparticle/reduced graphene oxide composites and related visible light catalytic performance
- Author
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Yiwen Shen, Yongsheng Chen, Chenchen Liu, Xue-Lei Duan, Houyu Wang, Jingfu Liu, Qi Guo, and Chun-Gang Yuan
- Subjects
Silver ,Environmental Engineering ,Materials science ,Light ,Graphene ,Oxide ,Metal Nanoparticles ,General Medicine ,Environmentally friendly ,Silver nanoparticle ,Catalysis ,law.invention ,Nanomaterials ,Sodium borohydride ,chemistry.chemical_compound ,chemistry ,law ,Environmental Chemistry ,Graphite ,Fourier transform infrared spectroscopy ,Composite material ,Microwaves ,General Environmental Science - Abstract
The creation of an environmentally friendly synthesis method for silver nanomaterials (AgNPs) is an urgent concern for sustainable nanotechnology development. In the present study, a novel straightforward and green method for the preparation of silver nanoparticle/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 parameters were optimized and the morphologies of the prepared materials were investigated. The characterization results reveal that spherical AgNPs were quickly synthesized and uniformly dispersed on rGO sheets using the proposed online system. Fourier transform infrared 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 composite 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 environmentally friendly.
- Published
- 2022