Effect of phosphate on ferrihydrite transformation and the associated arsenic behavior mediated by sulfate-reducing bacterium
Although PO is commonly found in association with iron (oxyhydr)oxide, the effect of PO on ferrihydrite reduction, mineralogical transformation, and associated As behavior in sulfate-reducing bacteria (SRB)-rich environments remains unclear. In this study, batch experiments, together with geochemical, mineralogical, and biological analyses, were conducted to elucidate these processes. The results showed that SRB can reduce ferrihydrite via direct and indirect processes, and PO promoted ferrihydrite reduction by supporting SRB growth at low and medium PO loadings. However, at high loadings, PO stabilized the ferrihydrite. PO shifted the transformation of ferrihydrite from magnetite and mackinawite to vivianite, which scavenges As effectively by incorporating As into its particle. In systems with 0.5 mM SO, PO exerted a weak effect on As mobilization. However, in systems with 10 mM SO, substantial amounts of As were released into the solution, and PO impacted As behavior strongly. Low PO loadings increased the mobilization of As because of the competitive adsorption of PO on mackinawite. Medium and high PO loadings were beneficial for As immobilization because of the substitution of mackinawite by vivianite. These findings have important implications for understanding the biogeochemistry of iron (oxyhydr)oxide and As behavior in SRB-containing sediments.
First ; Corresponding
National Key Research and Development Plan of China[2019YFC1805300] ; China Postdoctoral Science Foundation[2022M711476] ; National Nature Science Foundation of China ; null[2017ZT07Z479]
|WOS Research Area|
Engineering ; Environmental Sciences & Ecology
Engineering, Environmental ; Environmental Sciences
|WOS Accession No|
|ESI Research Field|
Cited Times [WOS]:0
|Document Type||Journal Article|
|Department||School of Environmental Science and Engineering|
1.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters,Ministry of Education,South China University of Technology,Guangzhou,510006,China
|First Author Affilication||School of Environmental Science and Engineering|
|Corresponding Author Affilication||School of Environmental Science and Engineering|
|First Author's First Affilication||School of Environmental Science and Engineering|
Gao，Kun,Zhu，Huiyan,Zhou，Wenjing,et al. Effect of phosphate on ferrihydrite transformation and the associated arsenic behavior mediated by sulfate-reducing bacterium[J]. JOURNAL OF HAZARDOUS MATERIALS,2023,448.
Gao，Kun.,Zhu，Huiyan.,Zhou，Wenjing.,Hu，Shiwen.,Zhang，Bowei.,...&Liu，Chongxuan.(2023).Effect of phosphate on ferrihydrite transformation and the associated arsenic behavior mediated by sulfate-reducing bacterium.JOURNAL OF HAZARDOUS MATERIALS,448.
Gao，Kun,et al."Effect of phosphate on ferrihydrite transformation and the associated arsenic behavior mediated by sulfate-reducing bacterium".JOURNAL OF HAZARDOUS MATERIALS 448(2023).
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