文献类型： 外文期刊

作者： Qian, Zhou ² ; Yanqiu, Su ¹ ; Lin, Guo ² ; Hongmei, Deng ² ; Lihan, Zhang ² ; Shuangnan, Min ² ; Shu, Yuan ³ ; Yanger, Chen ⁴ ; Qi, Liu ⁵ ;

作者机构： 1.Minist Educ China, Key Lab Land Resources Evaluat & Monitoring South, Chengdu 610066, Peoples R China

2.Sichuan Normal Univ, Coll Life Sci, Chengdu 610066, Sichuan, Peoples R China

3.Sichuan Agr Univ, Coll Resources, Chengdu 611134, Sichuan, Peoples R China

4.Sichuan Agr Univ, Coll Life Sci, Yaan 625000, Sichuan, Peoples R China

5.Guangdong Prov Key Lab New Technol Rice Breeding, Guangzhou 510640, Guangdong, Peoples R China

关键词： Purple non-sulfur bacteria; Cadmium; Bioprecipitation; Rhodopseudomonas palustris

期刊名称：INTERNATIONAL BIODETERIORATION & BIODEGRADATION （ 影响因子：4.8； 五年影响因子：5.0 ）

ISSN： 0964-8305

年卷期： 2024 年 188 卷

页码：

收录情况： SCI

摘要： Sulfur availability is an important factor affecting the tolerance and removal capability of heavy metals (HMs), but the roles of exogenous sulfur source in this process have rarely been reported in microorganisms. In this study, the effects of sulfur salts on Cd(II) bioremediation and the possible mechanism by Rhodopseudomonas palustris SC06 were investigated. R. palustris SC06 belonging to purple non -sulfur bacteria (PNSB) was isolated based on the Cd(II) tolerance and removal capability as well as their growth. Sodium sulfide (Na2S) was selected from six sulfur slats, and the synergistic effect with R. palustris SC06 could removed 94 % Cd(II) from aqueous solution containing 120 mg L-1 Cd(II) at 72 h. The functional groups including C--O, N-H/C-N, -SO3, -S-O, and -S-S- on the cell surfaces played the key role in the adsorption of Cd(II); among those, -S-O and -S-S- activated by Na2S. Na2S application significantly increased the content of Cd and S elements in R. palustris SC06, thereby clearly forming the bioprecipitation of CdS particles. Moreover, the content of cysteine, glutathione, and total sulfhydryl of R. palustris SC06 with the addition of Na2S were greatly upregulated under Cd(II) exposure, and the yield of extracellular polymeric substances (EPS) was also significantly improved, reaching up to 4437.30 mg g EPS-1, which was 17.0 % higher than that of the control. Hence, these results indicate that Na2S plays the vital role in adsorption and bioprecipitation of Cd(II) in PNSB, which provide a great potential strategy for the management of Cd(II) contaminated wastewater.