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Indexed by:期刊论文

Date of Publication:2017-03-01

Journal:ACS SUSTAINABLE CHEMISTRY & ENGINEERING

Included Journals:SCIE、EI

Volume:5

Issue:3

Page Number:2535-2543

ISSN No.:2168-0485

Key Words:Selenium nanomaterials; Lysinibacillus sp.; Biogenic; Controllable synthesis; Photocatalysis

Abstract:This study comprehensively investigated the feasibility of biogenic selenium nanomaterials (Se NMs) as a photocatalyst in dye degradation. The marine selenite-reducing bacterium Lysinibacillus sp. ZYM-1 was isolated. This strain can reduce selenite to Se NMs over a wide range of pH (5-9), selenite concentration (1-25 mM), and temperature (20-50 degrees C) within 48 h. Draft genome data suggested that sulfite reductase may be responsible for selenite reduction. Biogenic Se NMs generated under different conditions were subsequently characterized. The morphology and size of Se NMs were dependent on medium composition, pH, incubation time, selenite concentration, and temperature. Se nanospheres (Se NSs) exhibited significant visible light-driven photocatalytic activity on Rhodamine B (RhB) with H2O2. Three N-deethylation intermediates and phthalic acid were identified as degradation products of RhB by using liquid chromatography-high resolution mass spectrometry (LC-HRMS), indicating the coexistence of chromophore cleavage and the N-deethylation pathway.