木薯羧甲基淀粉对铜离子的吸附性能

采用搅拌球磨机对木薯淀粉进行机械活化,以活化60 min的木薯淀粉为原料,干法合成羧甲基淀粉吸附剂。考察羧甲基淀粉的取代度、溶液的pH值、Cu2+的初始浓度、吸附时间、羧甲基淀粉的投加量等因素对羧甲基淀粉吸附Cu2+性能的影响。结果表明,该羧甲基淀粉对Cu2+有很好的吸附作用;用取代度为0.841的羧甲基淀粉处理含Cu2+的废水,在pH=7.0、羧甲基淀粉的投加量50.00 mg/L、吸附时间15 min时,羧甲基淀粉对废水中Cu2+的吸附率高达98.80%,处理后的水质达到国家污水综合排放标准(GB8978-1996)中一级标准要求。

Adsorption ability of carboxymethyl starch on Cu~(2+)

The carboxymethyl starch(CMS)adsorbent was prepared by dry method using the cassava starch,mechanically activated for 60 min by a stirring-type ball mill,as a starting material.The effects of degree of substitution(DS) of carboxymethyl starch,solution pH value,Cu~(2+) initial concentration,adsorption time,and the dosage of carboxymethyl starch to the adsorption abilities of the adsorbent on Cu~(2+) were investigated.The results indicated that the adsorption abilities of the carboxymethyl starch on Cu~(2+) were better.Treated waste water of containing Cu~(2+) by the carboxymethyl starch,the adsorption rate of Cu~(2+) reached 98.80%,when the dosage of the carboxymethyl starch(DS=0.841)50.00mg/L,pH value equal to 7.0,the adsorption time 15 min.The effluent water could reach the national first class discharge standards(GB8978-1996).