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壳聚糖稳定纳米铁去除地表水中Cr(Ⅵ)污染的影响因素
引用本文:张娜,耿兵,李铁龙,金朝晖.壳聚糖稳定纳米铁去除地表水中Cr(Ⅵ)污染的影响因素[J].环境化学,2010,29(2).
作者姓名:张娜  耿兵  李铁龙  金朝晖
作者单位:1. 南开大学环境科学与工程学院,天津,300071
2. 南开大学环境科学与工程学院,天津,300071;环境污染过程与基准教育部重点实验室,南开大学,天津,300071
基金项目:天津市自然科学基金,教育部博士点新教师基金 
摘    要:以壳聚糖为稳定剂,制备纳米零价铁颗粒,TEM表征结果显示:其粒径分布范围为20—150 nm,平均粒径为82.4 nm.研究表明,壳聚糖稳定的纳米铁去除Cr(Ⅵ)的还原反应符合一级反应动力学方程.溶液中投加稳定剂壳聚糖,当壳聚糖浓度为150 mg.l-1时,80 min内表观一级动力学常数kobs约为空白溶液的2倍;干扰离子Ca2+,Mg2+,HCO3-和CO32-对壳聚糖稳定纳米铁去除Cr(Ⅵ)的批试验结果显示,Ca2+和Mg2+在80 min内使壳聚糖稳定纳米铁对Cr(Ⅵ)去除率分别降低了约20%和10%;HCO3-和CO32-的存在使去除率降低了约10%.

关 键 词:纳米铁  地表水  六价铬  影响因素

EFFECT OF SOME FACTORS ON Cr(VI) REMOVAL IN SURFACE WATER BY CHITOSAN-STABILIZED NANOSCALE ZERO-VALENT IRON
ZHANG Na,GENG Bing,LI Tie-long,JIN Zhao-hui.EFFECT OF SOME FACTORS ON Cr(VI) REMOVAL IN SURFACE WATER BY CHITOSAN-STABILIZED NANOSCALE ZERO-VALENT IRON[J].Environmental Chemistry,2010,29(2).
Authors:ZHANG Na  GENG Bing  LI Tie-long  JIN Zhao-hui
Abstract:Nanoscale zero-valent iron was synthesized using chitosan as a stabilizer.The results of TEM show that the size of the zero-valent iron ranges from 20 nm to 150 nm, with a mean partical size of 82.4 nm.The rate of reduction of Cr(Ⅵ) can be modelled by a pseudo-first-order reaction kinetics equation.When the concentration of chitosan is 150 mg· l~(-1) the first-order kinetic constant (k_(obs)) is about twice of the contorl.The existence of Ca~(2+) and Mg~(2+) decreased the Cr(Ⅵ) removal efficiency of zero-valent iron about 20% and 10% , respectively.HCO_3~- and CO_3~(2-) decreased the Cr(Ⅵ) removal efficiency of zero-valent iron by about 10%.
Keywords:nanoscale zero-valent iron  surface water  hexavalent chromium  influential factors  
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