Bacterial synthesis of iron sulfur minerals from ferrihydrite for aqueous chromium pollutant removal
ZOU Long, ZHU Fei, TANG Jie, ZHU Qi, NI Hai-Yan, LONG Zhong-Er, HUANG Yun-Hong
Nanchang Key Laboratory of Microbial Resources Exploitation & Utilization from Poyang Lake Wetland, College of Life Sciences, Jiangxi Normal University, Nanchang 330022, China
Abstract：In order to remove Cr(VI) from water, Shewanella oneidensis MR-1 was used to promote the biotransformation of ferrihydrite into iron sulfur secondary minerals in the presence of thiosulfate, and thus producing a microbe/mineral hybrid. The Cr(VI) removal ability and the influence factors, as well as the Cr(VI) removal mechanism of the synthesized hybrid were investigated. The phase composition analysis results and microscopic morphology showed that the S. oneidensis MR-1 cells were coated by the black secondary mineral nanoparticles identified as mackinawite (FeS), thereby forming the Bio-FeS@MR-1hybrid. The Cr(VI) with the initial concentration of 26mg/L had been removed completely by the prepared hybrid within 4h. Its removal amount was significantly higher than the total amount removed by individual bacterial cells and FeS secondary minerals with an equal amount, which demonstrating a synergistic effect between bacterial cells and FeS secondary minerals. The Bio-FeS@MR-1 hybrid possesses good tolerance to a wide pH range (3.0~9.0) and excellent regeneration ability. The removal efficiency of aqueous Cr(VI) and number of repeats were positively correlated with the content of FeS secondary mineral and cell density. The major chromium compounds existing in the Cr(VI) removal product were Cr(III) precipitates (such as Cr2O3 and Cr(OH)3), indicating that the removal mechanism of aqueous Cr(VI) include both adsorption and reduction.
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