The dynamic role of pH in microbial reduction of uranium(VI) in the presence of bicarbonate

Environmental Pollution
Jinchuan XieXiaohua Zhou

Abstract

The negative effect of carbonate on the rate and extent of bioreduction of aqueous U(VI) has been commonly reported. The solution pH is a key chemical factor controlling U(VI)aq species and the Gibbs free energy of reaction. Therefore, it is interesting to study whether the negative effect can be diminished under specific pH conditions. Experiments were conducted using Shewanella putrefaciens under anaerobic conditions with varying pH values (4-9) and bicarbonate concentrations ( [Formula: see text] , 0-50 mmol/L). The results showed a clear correlation between the pH-bioreduction edges of U(VI)aq and the [Formula: see text] . The specific pH at which the maximum bioreduction occurred (pHmbr) shifted from slightly basic to acidic pH (∼7.5-∼6.0) as the [Formula: see text] increased (2-50 mmol/L). At [Formula: see text]  = 0, however, no pHmbr was observed in terms of increasing bioreduction with pH (∼100%, pH > 7). In the presence of [Formula: see text] , significant bioreduction was observed at pHmbr (∼100% at 2-30 mmol/L [Formula: see text] , 93.7% at 50 mmol/L [Formula: see text] ), which is in contrast to the previously reported infeasibility of bioreduction at high [Formula: see text] . The pH-bioreduction edges were almost...Continue Reading

Citations

Nov 21, 2019·Environmental Science and Pollution Research International·Haiying FuYongdong Wang
Apr 17, 2021·Journal of Hazardous Materials·Jinchuan XieJianfeng Lin
Jul 30, 2021·The Science of the Total Environment·Wenbo YouMaosheng Zheng
Nov 27, 2021·ACS Earth & Space Chemistry·Luke T TownsendKatherine Morris

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