Release of Pb adsorbed on graphene oxide surfaces under conditions of Shewanella putrefaciens metabolism

Jianfeng Zhang, Shichang Wei, Zhenxing Liu, Huang Tang, Xiaoguang Meng, Weihuang Zhu

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

In this study, Pb(II) was used as a target heavy metal pollutant, and the metabolism of Shewanella putrefaciens (S. putrefaciens) was applied to achieve reducing conditions to study the effect of microbial reduction on lead that was preadsorbed on graphene oxide (GO) surfaces. The results showed that GO was transformed to its reduced form (r-GO) by bacteria, and this process induced the release of Pb(II) adsorbed on the GO surfaces. After 72 hr of exposure in an S. putrefaciens system, 5.76% of the total adsorbed Pb(II) was stably dispersed in solution in the form of a Pb(II)-extracellular polymer substance (EPS) complex, while another portion of Pb(II) released from GO-Pb(II) was observed as lead phosphate hydroxide (Pb10(PO4)6(OH)2) precipitates or adsorbed species on the surface of the cell. Additionally, increasing pH induced the stripping of oxidative debris (OD) and elevated the content of dispersible Pb(II) in aqueous solution under the conditions of S. putrefaciens metabolism. These research results provide valuable information regarding the migration of heavy metals adsorbed on GO under reducing conditions due to microbial metabolism.

Original languageEnglish
Pages (from-to)67-75
Number of pages9
JournalJournal of Environmental Sciences (China)
Volume118
DOIs
StatePublished - Aug 2022

Keywords

  • Extracellular polymeric substances
  • Graphene oxide
  • Microbial reduction
  • Pb(II)
  • Shewanella putrefaciens

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