农业环境科学学报2012，Vol.31Issue(3)：593-597,5.
动态条件下壳聚糖稳定纳米铁去除水体中Cr(Ⅵ)的研究
Removal of Hexavalent Chromium from Water by Chitosan-stabilized Nanoscale Zero-valent Iron Under Flow Conditions
摘要
Abstract
The capacity of chitosan-stabilized Fe° nanoparticles(chitosan-Fe°) to remove Cr( VI ) from water was examined with column ex-periment(column I :stimulated Cr( VI) contaminated water, column II :Cr( VI) contaminated surface water). In column I and column II, Cr( VI) attained its breakthrough after 160 pore volume(PV) and 127 PV, respectively. Compared with column I , column II decreased by 25% in the Cr( VI ) removal capacity of chitosan-Fe0. According to the SEM micrographs, in the presence of calcium and magnesium hardness botryoidal clusters were observed on the chitosan-Fe° from column II which led to the decrease of Cr( VI ) removal capacity for chi- tosan-Fe°. Characterizations with XPS revealed that the Fe atom ratio on chitosan-Fe0 in column I was lower than that in column II, due to the replacement of ferric oxyhydroxide by passivated precipitates containing calcium and magnesium. The results of high -resolution XPS demonstrated that Cr( VI ) was easier to be reduced in column I than in column II and under both conditions a little proportion of Cr( VI ) was adsorbed on the chitosan-Fe0 surface which was not reduced by zero-valent iron at the end of experiment.关键词
壳聚糖/纳米铁/六价铬Cr(Ⅵ)Key words
chitosan/ nanoscale zero-valent iron/ hexavalent chromium Cr( VI)分类
资源环境引用本文复制引用
耿兵,金朝晖,邓春生,张燕荣,王妮珊..动态条件下壳聚糖稳定纳米铁去除水体中Cr(Ⅵ)的研究[J].农业环境科学学报,2012,31(3):593-597,5.基金项目
天津市基金重点项目(07JCZDJC01800) （07JCZDJC01800）
国家水体污染控制与治理科技重大专项(2008ZX07425-008-002) （2008ZX07425-008-002）
中央级公益性科研院所基本科研业务费(BSRF201010) （BSRF201010）
