TY - JOUR
T1 - Release of Pb adsorbed on graphene oxide surfaces under conditions of Shewanella putrefaciens metabolism
AU - Zhang, Jianfeng
AU - Wei, Shichang
AU - Liu, Zhenxing
AU - Tang, Huang
AU - Meng, Xiaoguang
AU - Zhu, Weihuang
N1 - Publisher Copyright:
© 2021
PY - 2022/8
Y1 - 2022/8
N2 - 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.
AB - 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.
KW - Extracellular polymeric substances
KW - Graphene oxide
KW - Microbial reduction
KW - Pb(II)
KW - Shewanella putrefaciens
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U2 - 10.1016/j.jes.2021.08.041
DO - 10.1016/j.jes.2021.08.041
M3 - Article
C2 - 35305774
AN - SCOPUS:85122620857
SN - 1001-0742
VL - 118
SP - 67
EP - 75
JO - Journal of Environmental Sciences (China)
JF - Journal of Environmental Sciences (China)
ER -