Goethite Enhances Cr(VI) Reduction by S. oneidensis MR-1 under Different Conditions: Mechanistic Insights

作者：Yu Hou, Yanhong Li, Yaru Wang, Zongqiang Zhu, Shen Tang, Jie Zhang, Qiaodong Pan, Ting Hu · 发表于：Microorganisms · 年份：2024 · DOI：10.3390/microorganisms12040754 · 被引用次数：15 · 研究领域：Chromium effects and bioremediation、Microbial Fuel Cells and Bioremediation、Environmental remediation with nanomaterials

Chromium (Cr) contamination, widely present in the environment, poses a significant threat to both ecology and human health. Microbial remediation technology has become a hot topic in the field of heavy metal remediation due to its advantages, such as environmental protection, low cost, and high efficiency. This paper focused on using various characterization and analysis methods to investigate the bioreduction effect and mechanism of microorganisms on Cr(VI) under various influencing factors. The main contents and conclusions were as follows: Shewanella oneidensis MR-1 was selected as the target strain for studying its reduction of Cr(VI) at different inoculation amounts, temperatures, pH values, time intervals, etc. The results indicated that S. oneidensis MR-1 exhibited an optimal reduction effect on Cr(VI) at pH 7 and a temperature of 35 °C. Additionally, electron shuttles (ESs), including humic acid (HA) and 9,10-antraquinone-2,6-disulfonate (AQDS), were introduced into the degradation system to improve the reduction efficiency of S. oneidensis MR-1. Upon adding goethite further, S. oneidensis MR-1 significantly enhanced its reducing ability by converting Fe(III) minerals to Fe(II) and reducing Cr(VI) to Cr(III) during electron transfer.