Professor Wan’s group published their new research results about Sb removal from water in JHM.
Title: Enhanced biological antimony removal from water by combining elemental sulfur autotrophic reduction and
disproportionation
Authors: Qiaochong He, YangLiu, Dongjin Wan, Yongde Liu, Shuhu Xiao, Yiduo Wang, Yahui Shi
Author affiliations: College of Environmental Engineering, Henan University of Technology, Zhengzhou, 450001, China; Henan
International Joint Laboratory of Environmental Pollution, Remediation and Grain Quality Security, Zhengzhou, Henan 450001, China
Journal: Journal of Hazardous Materials
Available online April 14, 2022
Antimony (Sb), a toxic metalloid, has serious negative effects on human health and its pollution has become a global environmental problem. Bio-reduction of Sb(V) is an effective Sb-removal approach. This work, for the first time, demonstrates the feasibility of autotrophic Sb(V) bio-reduction and removal coupled to anaerobic oxidation of elemental sulfur (S0). In the S0-based biological system, Sb(V) was reduced to Sb(III) via autotrophic bacteria by using S0 as electron donor. Meanwhile, S0 disproportionation reaction occurred under anaerobic condition, generating sulfide and SO42- in the bio-systems. Subsequently, Sb(III) reacted with sulfide and formed Sb(III)-S precipitate, achieving an effective total Sb removal. The precipitate was identified as Sb2S3 by SEM-EDS, XPS, XRD and Raman spectrum analyses. In addition, it was found that co-existing nitrate inhibited the Sb removal, as nitrate is the favored electron acceptor over Sb(V). In contrast, the bio-reduction of co-existing SO42- enhanced sulfide generation, followed by promoting Sb(V) reduction and precipitation. Illumina high-throughput sequencing analysis revealed that Metallibacterium, Citrobacter and Thiobacillus might be responsible for Sb(V) reduction and S0 disproportionation. This study provides a promising approach for the remediation of Sb(V)-contaminated water.
DOI:
https://doi.org/10.1016/j.jhazmat.2022.128926
