欢迎访问南华大学学报（自然科学版）

快速检索			高级检索

周佳权,谢水波,荣丽杉,杨金辉,刘迎九.纤维单胞菌和单质铁协同作用处理含铀废水[J].南华大学学报(自然科学版),2018,32(4):1~7.[ZHOU Jiaquan,XIE Shuibo,RONG Lishan,YANG Jinhui,LIU Yingjiu.Treatment of Wastewater Containing Uranium by Synergistic Action of Cellulomonas sp and Zero-valentiron[J].Journal of University of South China(Science and Technology),2018,32(4):1~7.]

纤维单胞菌和单质铁协同作用处理含铀废水

Treatment of Wastewater Containing Uranium by Synergistic Action of Cellulomonas sp and Zero-valentiron

投稿时间：2018-03-24

DOI：

中文关键词: 单质铁 U(Ⅵ)还原纤维单胞菌 SEM-EDS分析 XPS分析

英文关键词:zero-valent iron(ZVI) U(Ⅵ) reduction Cellulomonas sp SEM-EDS analysis XPS analysis

基金项目:国家自然科学基金项目(11475080)；湖南省高校实验创新平台开放基金项目(16K075)；南华大学研究生科研创新项目(2017XCX14)

作者	单位	E-mail
周佳权	南华大学污染控制与资源化技术湖南省重点实验室,湖南衡阳 421001	851584219@qq.com
谢水波	南华大学污染控制与资源化技术湖南省重点实验室,湖南衡阳 421001 南华大学铀矿冶生物技术国防重点学科实验室,湖南衡阳 421001
荣丽杉	南华大学污染控制与资源化技术湖南省重点实验室,湖南衡阳 421001
杨金辉	南华大学污染控制与资源化技术湖南省重点实验室,湖南衡阳 421001
刘迎九	南华大学污染控制与资源化技术湖南省重点实验室,湖南衡阳 421001

摘要点击次数: 962

全文下载次数: 521

中文摘要:

在电子中介体蒽醌-2-磺酸钠(AQS)存在条件下,探讨了革兰氏阳性兼性厌氧菌(Cellulomonas sp)与单质铁(ZVI)协同作用处理水中U(Ⅵ)的效果和相应机理.实验结果表明:在厌氧环境下,单质铁与纤维单胞菌去除U(Ⅵ)存在明显的协同作用.AQS存在条件下,在24 h内、pH为7、温度为30 ℃时,ZVI与纤维单胞菌协同作用,U(Ⅵ)去除率为97.6%；在ZVI对照中,U(Ⅵ)去除率仅为11.7%.在无细胞对照组中未观察到U(Ⅵ)减少.Cu²⁺、Ca²⁺等离子的共存对U(Ⅵ)去除有明显的抑制作用,与其他离子相比,Mn²⁺、Cr⁶⁺的抑制作用较小.SEM-EDS分析表明,纤维单胞菌去除U(Ⅵ)后表面形态发生了改变,菌体表面形成了较多不规则突起且菌体表面覆盖有铀沉淀物.XPS结果表明:铀与纤维单胞菌相互作用后以U(Ⅳ)和U(Ⅵ)的混合物存在.通过XPS的峰面积计算,纤维单胞菌还原U(Ⅵ)后,U(Ⅳ)和U(Ⅵ)的含量分别为61.9%和38.1%,且溶液中的铀大部分是稳定的UO₂.

英文摘要:

In this study,the synergistic effect and its corresponding mechanism of gram-positive facultative anaerobic bacteria(Cellulomonas sp) and zero-valent iron(ZVI) has on the treatment of U(Ⅵ) in aqueous solution was studied in the presence of an electronic intermediate sodium arsenide-2-sulfonate(AQS).Experiments show that under anaerobic conditions,there is a significant synergistic effect of ZVI and Cellulomonas sp in the reduction of U(Ⅵ).Using AQS as an electron shuttle vector,Cellulomonas sp utilizes electron donors to efficiently reduce U(Ⅵ).Within 24 hours,when the pH was 7 and temperature was 30 ℃,ZVI and Cellulomonas sp come into synergistic reaction,and the U(Ⅵ) removal rate was up to 97.6%,while in the ZVI control group,the U(Ⅵ) removal rate was only 11.7%.No U(Ⅵ) reduction was observed in the cell-free control group.The coexistence of Cu²⁺ and Ca²⁺ ions has obvious inhibitory effect on U(Ⅵ) reduction.Compared with other ions,the inhibition effect of Mn²⁺ and Cr⁶⁺ is much smaller.Scanning electron icroscopy(SEM) and energy dispersive pectrometer(EDS) results showed that ,after the Cellulomonas sp reduced the U(Ⅵ),the surface of Cellulomonas sp has changed,namely,there were many irregular protrusions formed on the surface of the bacteria and covered with uranium deposits.And the uranium element was deposited in the cells of the Cellulomonas sp.XPS results showed that after the interaction of uranium and Cellulomonas SP,they exist as a mixture of U(Ⅵ) and U(Ⅳ).Through the calculation of the peak area of XPS,the contents of U(Ⅳ) and U(Ⅵ) were 61.9% and 38.1% respectively after the interaction.And most of the uranium in the solution is stable UO₂.

查看全文查看/发表评论下载PDF阅读器

关闭