Changes in Desulfovibrio desulfuricans sub sp EPS components and adsorption performance under exogenous sulfur induction and its mediation role in the biosynthesis of ZnS QDs. Issue 1 (February 2023)

• Record Type: Journal Article
• Authors: Gan, Yu; Ma, Shuangnian; Dai, Wencan; Song, Weifeng; Lian, Zeyang; Huang, Xiangwu; Yang, Rengao; Mo, Zhihua
• Is Part Of: Journal of environmental chemical engineering. Volume 11:Issue 1(2023)
• Publication Date: 2023-02
• Subjects: SRB -- EPS -- Sulfur sources -- Adsorption -- Biosynthesis -- Resource recycling; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.109225
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Sulfate Reducing Bacteria(SRB) can remove heavy metal ions by producing metal sulfide precipitation, which has aroused the research interest of scholars recently. For SRB, exogenous sulfur is one of the most important nutrients, however, there are few reports about the impact of exogenous sulfur on SRB, especially its EPS. Here, we investigated the inducible effect of sulfur sources (Na2 SO4, Na2 SO3, and Na2 S2 O3 ·H2 O) on EPS production from SRB for the first time. The results found that exogenous sulfur can significantly increase the production of EPS, especially protein. The increased functional groups(C–O/C–N, CN) in the protein are favorable to adsorption of more heavy metals. Moreover, S 2– was added to the system after adsorption of Zn(II) for the biosynthesis of ZnS QDs from the resource recovery point. The experiments and tests showed the yield of cubic β-ZnS QDs correlated with the amount and adsorption performance of EPS. The PL spectrum of EPS present red-shifted and enhanced antibacterial properties due to the adhesion of EPS to ZnS QDs, the basic amino acid His in EPS played an important role in the adsorption of Zn(Ⅱ) and the nucleation of ZnS QDs. This research brings new horizons for using EPS to treatment heavy metal wastewater and resource recycling. Graphical Abstract: ga1 Highlights: Exogenous sulfur can significantly improve EPS yield and its adsorption capacity. ZnS QDs yield is related to the performance of EPS. EPS can regulate the PL performance of ZnS QDs. Amino acids in EPS significantly affect the average particle size of ZnS QDs. The presence of EPS can enhance the antibacterial effect of ZnS.