title: Immobilization of chlorine dioxide modified cells for uranium absorption.
abstract: There has been a trend towards the use of microorganisms to recover metals from industrial wastewater, for which various methods have been reported to be used to improve microorganism adsorption characteristics such as absorption capacity, tolerance and reusability. In present study, chlorine dioxide(ClO2), a high-efficiency, low toxicity and environment-benign disinfectant, was first reported to be used for microorganism surface modification. The chlorine dioxide modified cells demonstrated a 10.1% higher uranium adsorption capacity than control ones. FTIR analysis indicated that several cell surface groups are involved in the uranium adsorption and cell surface modification. The modified cells were further immobilized on a carboxymethylcellulose(CMC) matrix to improve their reusability. The cell-immobilized adsorbent could be employed either in a high concentration system to move vast UO2(2+) ions or in a low concentration system to purify UO2(2+) contaminated water thoroughly, and could be repeatedly used in multiple adsorption-desorption cycles with about 90% adsorption capacity maintained after seven cycles.
authors.affiliation: Research Institute of Photocatalysis, College of Chemistry, Fuzhou University, Fuzhou 350108, China. Electronic address: comhsb@163.com.
authors.forename: Shengbin
authors.initials: S
authors.lastname: He
authors.affiliation: China Nuclear Power Engineering co.,LTD (FuQing), China.
authors.forename: Binbiao
authors.initials: B
authors.lastname: Ruan
authors.affiliation: Research Institute of Photocatalysis, College of Chemistry, Fuzhou University, Fuzhou 350108, China.
authors.forename: Yueping
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: Research Institute of Photocatalysis, College of Chemistry, Fuzhou University, Fuzhou 350108, China.
authors.forename: Xiaobin
authors.initials: X
authors.lastname: Zhou
authors.affiliation: Research Institute of Photocatalysis, College of Chemistry, Fuzhou University, Fuzhou 350108, China. Electronic address: xu@fzu.edu.cn.
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Xu
mesh_terms: D000327:Adsorption; D001407:Bacillus / Q000187:drug effects* / Q000378:metabolism*; D017606:Chlorine Compounds / Q000494:pharmacology*; D004202:Disinfectants / Q000494:pharmacology*; D010087:Oxides / Q000494:pharmacology*; D017550:Spectroscopy, Fourier Transform Infrared; D017974:Uranium Compounds / Q000378:metabolism*; D014875:Water Pollutants, Radioactive / Q000378:metabolism*; D018508:Water Purification
chemical_list: D017606:Chlorine Compounds; D004202:Disinfectants; D010087:Oxides; D017974:Uranium Compounds; D014875:Water Pollutants, Radioactive; C025109:chlorine dioxide; C012597:uranium dioxide
keywords: Chlorine dioxide; Immobilization; Surface modification; Uranium adsorption