Enhanced sulfate and metal removal by reduced graphene oxide self-assembled Enterococcus avium sulfate-reducing bacteria particles
Enhanced sulfate and metal removal by reduced graphene oxide self-assembled Enterococcus avium sulfate-reducing bacteria particles
复制标题
通过还原氧化石墨烯自组装硫酸盐肠球菌还原菌颗粒增强硫酸盐和金属去除
DOI：
10.1016/j.biortech.2018.07.012
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发表时间：
2018
影响因子：
11.4
通讯作者：
Zhang Hongguo
中科院分区：
文献类型：
--
作者：
Yan Jia;Ye Weizhuo;Jian Zhuoyi;Xie Jiehui;Zhong Kengqiang;Wang Siji;Hu Haoshen;Chen Zixuan;Wen Huijun;Zhang Hongguo
以7株硫酸盐还原菌为载体，将氧化石墨烯(GO)导入肠球菌，SRB将GO部分还原为氧化石墨烯(RGO)。RGO可通过7株硫酸盐还原菌进一步自组装成By-rGO颗粒。RGO促进了菌株BY 7的生长和硫酸盐还原活性，这可能是由于rGO的保护作用，并作为电子穿梭促进了电子传递。PH和温度变化对菌株By-rGO的影响显著减弱，在pH 2.0~12.0和10~45 °C范围内分别观察到生长和硫酸盐还原。7株SRB菌株对副产物颗粒中重金属的毒性显著降低，重金属去除速度明显加快(最高可达50%)。本研究建立的固定化方法可能为SRBS的应用开辟一条新的途径，特别是在极端环境条件下。
Graphene oxide (GO) was introduced toEnterococcusaviumstrain BY7 sulfate-reducing bacteria culture as a carrier, GO was partially reduced by SRB to reduced graphene oxide (rGO). The rGO could further self-assembleEnterococcus aviumstrain BY7 sulfate-reducing bacteria to form BY-rGO particles. Growth and sulfate reduction activity of strain BY7 was promoted by rGO, which probably due to the protective effect of rGO, and enhanced electron transfer by rGO as electron shuttle. Effects of pH and temperature variance on strain BY-rGO were remarkably weakened, growth and sulfate reduction were observed from pH 2.0 to 12.0, and from 10 to 45 °C, respectively. Metal toxicity to BY7 strain SRB was sharply decreased in BY-rGO particles and heavy metal removal was remarkably accelerated (up to 50%). The immobilization methods established in this study might open a new way for the application of SRBs, especially under extreme environmental conditions.