碳源诱导下<i>D. desulfuricans sub</i> sp. EPS特性及对Cd(Ⅱ)的吸附

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Abstract Through three kinds of carbon source (HCOONa, CH₃COONa and C₆H₁₂O₆), under different concentrations of Desulfovibrio desulfuricans sub sp.(D. desulfuricans sp.) for stress/induction training, the changes in EPS fractions before and after stress/induction and changes in the sorption properties of Cd(II) were investigated. The results showed that when the stress concentration of HCOONa was 3.0g/L, the stress/induction effect was the most obvious, EPS production reached 1709.78mg/g VSS, and the protein yield in EPS was the highest, reaching 1516.68mg/g VSS, which was 244.93% higher than that before stress/induction. Under these conditions, HCOONa-EPS showed the highest adsorption of Cd(II) at 1081.95mg/g EPS, an increase of 99.47%, and the adsorption process conforms to the secondary kinetic law. Three-dimensional fluorescence (3D-EEM) tests showed that the protein content, especially tryptophan-like content, increased significantly in EPS after stress/induction. Fourier infrared spectroscopy (FTIR) test showed that C=O, N-H/C-N, C-O-C and other functional groups increased greatly after stress, which played an important role in adsorption of Cd(II). X-ray electron spectroscopy (XPS) showed that after the stress/induction of carbon source HCOONa, the concentration of functional groups such as C-O/C-N, C=O, C=N and other functional groups in EPS increased significantly, which may be the main group for adsorption of Cd(II).

Key words： EPS protein carbon source Cd(Ⅱ)

Received: 03 November 2022

PACS:

X172

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	Articles by authors
	HUANG Xiang-wu
	SONG Wei-feng
	YANG Zuo-yi
	DAI Wen-can
	GAN Yu
	LIAN Ze-yang
	ZHOU Wen-bin
	CHENG Li-yao
	WU Zhi-xin

Cite this article:

HUANG Xiang-wu,SONG Wei-feng,YANG Zuo-yi等. The EPS characteristics of D. desulfuricans sub sp. and its adsorption performance for Cd(Ⅱ) under carbon source induction[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2889-2898.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I6/2889

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