水溶液
纳米颗粒
化学
硫化铁
硫化物
核化学
铬酸盐转化膜
零价铁
环境修复
化学工程
纳米技术
材料科学
硫黄
吸附
有机化学
腐蚀
污染
工程类
生物
生态学
作者
Yangyang Yu,Qian-Wen Cheng,Chong Sha,Yuxuan Chen,Saraschandra Naraginti,Yang‐Chun Yong
标识
DOI:10.1016/j.cej.2019.122404
摘要
In this study, biogenic iron sulfide nanoparticles (FeS NPs) were synthesized by Shewanella and used for Cr(VI) removal. To control the size of FeS NPs, the biological S(-II) releasing rate was proposed as the key parameter in Fe(III) reduction and was subtly tuned with the aid of a kinetic model. Field emission scanning electron microscope (FESEM) observation revealed that gradually increased S(-II) releasing rate lead to the formation of FeS NPs with size from 30 nm to 90 nm. Impressively, the biogenic FeS NPs with 30–40 nm showed high removal rate and large removal capacity (565.6 mg/g) for removal of aqueous Cr(VI). Further analyses revealed that the improved performance of small FeS NPs was ascribed to the reduced passivation of FeS. Therefore, this study provided a facile approach for size-controlled biosynthesis of FeS NPs, and demonstrated the promise to use biogenic FeS NPs for chromate remediation.
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