现代地质2012，Vol.26Issue(5)：932-938,7.
膨润土负载纳米铁去除地下水中六价铬研究
A Study on Bentonite-supported Nano Iron for Removal of Cr ( Ⅵ ) in Groundwater
摘要
Abstract
With the development of living standard and urbanization, groundwater pollution is becoming serious. It is hazardous to human health, ecotope and social security with the heavy metal and organic field pollutants. The issues of Cr( VI) contaminated groundwater are paid more attention on recently. As Cr( VI) has high toxici-ty and mobility in water compared to Cr( HI ) , it is very important to deposit chromium by reduction of Cr( VI) into Cr( IE ) using nano iron; therefore, the contaminants in source region are stabilized and indiffused from all around. While the agglomeration and oxidation of nano iron is often unavoidable due to the very small particles, it is essential to study the disperse and stability of nano iron. In this paper, bentonite was used as a porous-based support material for synthesized nano iron. The results showed as follows. ( 1 ) Bentonite-supported nano iron particles are well sphere scattering on the bentonite. (2) The removal efficiency of B-NZVI is better than NZVI comparing the same iron content (1 g/L) B-NZVI, NZVI and 1 g/L bentonite. Reduction kinetics of Cr (VI) by B-NZVI were described by a pseudo first-order reaction. Kinetics studies of Cr( VI) reduction using B-NZVI suggested that the reactivity of NZVI particles supported on bentonite were decreased significantly with the decrease of initial iron content. (3) Column experiments showed that B-NZVI was no migratory in the column packed silicon dioxide and it indicated B-NZVI is suitably applied in point-source pollution. Breakthrough curve of Cr( VI) in the column was obtained for reference to application.关键词
膨润土/纳米铁/六价铬/批实验/柱实验Key words
bentonite/ nano-iron/ Cr(VI)/ batch experiment/ column experiment分类
天文与地球科学引用本文复制引用
李晨桦,陈家玮..膨润土负载纳米铁去除地下水中六价铬研究[J].现代地质,2012,26(5):932-938,7.基金项目
中国地质调查局项目(1212011120288) （1212011120288）
中央高校基本科研业务费专项资金项目(2012123,2010ZD14) （2012123,2010ZD14）
国家科技重大专项“水体污染控制与治理科技重大专项”(2009ZX07424-002). （2009ZX07424-002）
