Mutual effects of Shewanella putrefaciens-montmorillonite and their impact on uranium immobilization

Wencai Cheng; Huiping Tang; Yunpeng Yi; Xiaoqin Nie; Congcong Ding

doi:10.1016/j.chemosphere.2022.135096

Mutual effects of Shewanella putrefaciens-montmorillonite and their impact on uranium immobilization

Chemosphere. 2022 Sep;303(Pt 1):135096. doi: 10.1016/j.chemosphere.2022.135096. Epub 2022 May 23.

Authors

Wencai Cheng¹, Huiping Tang¹, Yunpeng Yi², Xiaoqin Nie¹, Congcong Ding³

Affiliations

¹ Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang, 621010, PR China; National Collaborative Innovation Center for Nuclear Waste and Environmental Safety, Southwest University of Science and Technology, Mianyang, 621010, PR China; School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang, 621010, PR China.
² Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang, 621010, PR China; National Collaborative Innovation Center for Nuclear Waste and Environmental Safety, Southwest University of Science and Technology, Mianyang, 621010, PR China.
³ Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang, 621010, PR China; National Collaborative Innovation Center for Nuclear Waste and Environmental Safety, Southwest University of Science and Technology, Mianyang, 621010, PR China. Electronic address: dingc_3650483@163.com.

PMID: 35618069
DOI: 10.1016/j.chemosphere.2022.135096

Abstract

This study investigated the immobilization behavior of U(VI) by the mixture of Shewanella putrefaciens (S. putrefaciens) and montmorillonite with batch experiment. The relevant mechanisms were discussed based on the experimental results and characterizations. It was found that the immobilization of U(VI) by S. putrefaciens-montmorillonite was inhibited at pH < 7.0 and enhanced at pH > 7.0. The inhibition effect was due to the aggregation and coverage between S. putrefaciens and montmorillonite, whereas the association of microbial dissolvable organic matters (DOM) on montmorillonite could promote immobilization of U(VI). The evidences of X-photoelectron spectroscopy (XPS) and density functional theory (DFT) simulation confirmed that the carboxyl-, hydroxyl-, nitrogen-based DOM do have the ability to interacted with U(VI). This work highlights a comprehensive and overlook perspective to understand the immobilization behavior of U(VI) in environmental organo-minerals.

Keywords: Biomineralization; Dissolvable organic matters; Interaction; Microbe; Minerals.

MeSH terms

Bentonite
Dissolved Organic Matter
Photoelectron Spectroscopy
Shewanella putrefaciens*
Uranium* / chemistry

Substances

Dissolved Organic Matter
Bentonite
Uranium