Role of Sulfate-Reducing Bacteria in the Removal of Hexavalent Chromium by Biosynthetic Iron Sulfides (FeS<sub>1+x</sub>)
The reduction of Cr(VI) by biosynthesis iron sulfides (FeS<sub>1+x</sub>) under anoxic conditions has been studied extensively. However, the role of sulfate-reducing bacteria (SRB) when FeS<sub>1+x</sub> containing SRB removes contaminants during in situ remediation still nee...
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MDPI AG
2023-04-01
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| author | Jun Hou Zhenyu Li Jun Xia Lingzhan Miao Jun Wu Bowen Lv |
| author_facet | Jun Hou Zhenyu Li Jun Xia Lingzhan Miao Jun Wu Bowen Lv |
| author_sort | Jun Hou |
| collection | DOAJ |
| description | The reduction of Cr(VI) by biosynthesis iron sulfides (FeS<sub>1+x</sub>) under anoxic conditions has been studied extensively. However, the role of sulfate-reducing bacteria (SRB) when FeS<sub>1+x</sub> containing SRB removes contaminants during in situ remediation still needs further study. The secondary kinetic constant of biosynthetic FeS<sub>1+x</sub> with the presence of SRB (called BS-FeS<sub>1+x</sub>) was 1.72 times that of FeS<sub>1+x</sub> with the absence of SRB (called BNS-FeS<sub>1+x</sub>) under FeS<sub>1+x</sub>:Cr(VI) molar ratio = 10:1, indicating that SRB had a promoting effect on the removal of Cr(VI). Additionally, XPS showed that 5.7% of Cr(VI) remained in the solid phase in the BS-FeS<sub>1+x</sub> system, indicating BS-FeS<sub>1+x</sub> could not only remove Cr(VI) by reduction but also by adsorption. Meanwhile, the Cr(VI) removal efficiency of BS-FeS<sub>1+x</sub> was 100% under anoxic conditions with FeS<sub>1+x</sub>:Cr(VI) molar ratio = 1:1, which was higher than BNS-SRB (93.4%). SRB could enhance the Cr(VI) removal efficiency, which was possibly due to the constant release of S(-II) and the improvement of the stability and dispersion and the buffering effect. This discovery provided an inspiring idea of the application of biosynthetic iron sulfides to in situ remediation. |
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| last_indexed | 2024-03-11T04:26:07Z |
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| spelling | doaj.art-61d1c452d1c04d04abc694a6d09280b62023-11-17T21:49:14ZengMDPI AGWater2073-44412023-04-01158158910.3390/w15081589Role of Sulfate-Reducing Bacteria in the Removal of Hexavalent Chromium by Biosynthetic Iron Sulfides (FeS<sub>1+x</sub>)Jun Hou0Zhenyu Li1Jun Xia2Lingzhan Miao3Jun Wu4Bowen Lv5Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, ChinaKey Laboratory of Integrated Regulation and Resources Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, ChinaCollege of Civil and Transportation Engineering, Hohai University, Nanjing 210098, ChinaKey Laboratory of Integrated Regulation and Resources Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, ChinaKey Laboratory of Integrated Regulation and Resources Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, ChinaPolicy Research Center for Environment and Economy, Ministry of Ecology and Environment of the People’s Republic of China, Beijing 100029, ChinaThe reduction of Cr(VI) by biosynthesis iron sulfides (FeS<sub>1+x</sub>) under anoxic conditions has been studied extensively. However, the role of sulfate-reducing bacteria (SRB) when FeS<sub>1+x</sub> containing SRB removes contaminants during in situ remediation still needs further study. The secondary kinetic constant of biosynthetic FeS<sub>1+x</sub> with the presence of SRB (called BS-FeS<sub>1+x</sub>) was 1.72 times that of FeS<sub>1+x</sub> with the absence of SRB (called BNS-FeS<sub>1+x</sub>) under FeS<sub>1+x</sub>:Cr(VI) molar ratio = 10:1, indicating that SRB had a promoting effect on the removal of Cr(VI). Additionally, XPS showed that 5.7% of Cr(VI) remained in the solid phase in the BS-FeS<sub>1+x</sub> system, indicating BS-FeS<sub>1+x</sub> could not only remove Cr(VI) by reduction but also by adsorption. Meanwhile, the Cr(VI) removal efficiency of BS-FeS<sub>1+x</sub> was 100% under anoxic conditions with FeS<sub>1+x</sub>:Cr(VI) molar ratio = 1:1, which was higher than BNS-SRB (93.4%). SRB could enhance the Cr(VI) removal efficiency, which was possibly due to the constant release of S(-II) and the improvement of the stability and dispersion and the buffering effect. This discovery provided an inspiring idea of the application of biosynthetic iron sulfides to in situ remediation.https://www.mdpi.com/2073-4441/15/8/1589iron sulfidesSRB bacteriaCr(VI)stabilizationbuffering capacity |
| spellingShingle | Jun Hou Zhenyu Li Jun Xia Lingzhan Miao Jun Wu Bowen Lv Role of Sulfate-Reducing Bacteria in the Removal of Hexavalent Chromium by Biosynthetic Iron Sulfides (FeS<sub>1+x</sub>) Water iron sulfides SRB bacteria Cr(VI) stabilization buffering capacity |
| title | Role of Sulfate-Reducing Bacteria in the Removal of Hexavalent Chromium by Biosynthetic Iron Sulfides (FeS<sub>1+x</sub>) |
| title_full | Role of Sulfate-Reducing Bacteria in the Removal of Hexavalent Chromium by Biosynthetic Iron Sulfides (FeS<sub>1+x</sub>) |
| title_fullStr | Role of Sulfate-Reducing Bacteria in the Removal of Hexavalent Chromium by Biosynthetic Iron Sulfides (FeS<sub>1+x</sub>) |
| title_full_unstemmed | Role of Sulfate-Reducing Bacteria in the Removal of Hexavalent Chromium by Biosynthetic Iron Sulfides (FeS<sub>1+x</sub>) |
| title_short | Role of Sulfate-Reducing Bacteria in the Removal of Hexavalent Chromium by Biosynthetic Iron Sulfides (FeS<sub>1+x</sub>) |
| title_sort | role of sulfate reducing bacteria in the removal of hexavalent chromium by biosynthetic iron sulfides fes sub 1 x sub |
| topic | iron sulfides SRB bacteria Cr(VI) stabilization buffering capacity |
| url | https://www.mdpi.com/2073-4441/15/8/1589 |
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