利用壳聚糖溶液探讨黄土中铬(VI)的提取效果研究

摘要

铬是环境中一种重要的重金属污染物,大量含铬的废水、废渣随意排放导致土壤、水体和生物遭到不同程度的污染.中国黄土分布面积广泛,本研究以典型的西部黄土为对象,通过室内土柱淋滤试验,以灌水量和示踪铬浓度为控制因子,研究铬在黄土层中的分布、迁移转化规律及黄土对铬的吸附特性.由于壳聚糖的结构中含有大量的-NH2和-OH,因此壳聚糖,它对重金属离子有优良的吸附作用.探讨了吸附时间、壳聚糖浓度、pH、液固比、温度对壳聚糖吸附黄土中Cr(VI)的提取效果.%Heavy metal is a kind of important environmental pollutants,a large number of waste water,waste residue containing chromium free emissions lead to different degrees of pollution,water,soil and biological.Loess area is widely distributed in our country,in a typical western loess as the object of this research,through indoor soil column leaching experiment,irrigation water and tracer chromium concentration as control factor,study the distribution,migration and transform rule of chromium in soil lager and adsorption properties of loess on chrome.Due to the structure of chitosan contains a large number of NH2 and-OH,chitosan,therefore,it is good for heavy metal ions adsorption.Discusses the adsorption time,chitosan concentration,pH,solid-liquid ratio,temperature on chitosan adsorption of Cr(VI)in the loess extraction effect.