The EPS characteristics of Desulfovibrio desulfuricans sub sp. and its adsorption performance for Zn(Ⅱ) under exogenous sulfur induction

作者：Gan, Yu; Song, Wei-Feng^*; Yang, Zuo-Yi; Lian, Ze-Yang; Ma, Shuang-Nian; Huang, Xiang-Wu; Yang, Ren-Gao; Wen, Yan-Biao

来源：China Environmental Science, 2022, 42(11): 5144-5152.

• Adsorption capacities
• Adsorption performance
• Desulfovibrio desulfuricans
• Exogenous sulphur
• Extracellular
• Extracellular polymeric substance
• Polymeric substance
• Protein contents
• Stress induction
• Zn(&#8561
• )

In this paper, the effect of exogenous sulfur (Na2SO4, Na2SO3, Na2S2O3·5H2O) stress/induction on extracellular polymeric substances(EPS) of Desulfovibrio desulfuricans sub sp. (D. desulfuricans sp.) was studied. The results showed that addition of 0.50g/L Na2SO3led to the highest EPS yield of 2104.39mg/g VSS (1888.52mg/g VSS of protein content), which was 300% higher than that without Na2SO3addition, and as a result, 98.17% increase in Zn(II) adsorption capacity (954.4mg/g EPS) achieved. Three-dimensional fluorescence (3D-EEM) spectral results showed that tyrosine-like substances in EPS were greatly increased after sulfur stress/induction;Fourier transform infrared spectroscopy (FTIR) results showed that significant increases in functional groups such as —OH, C=O, C—O—C EPS were mainly responsible for the enhance adsorption of Zn(II);The results of X-ray photoelectron spectroscopy (XPS) results showed that the content of C—O/C—N, C=N and oxygen-containing functional group (X) in EPS increased after sulfur stress/induction (Na2SO3and Na2S2O3·5H2O).