摘要
研究了以微晶纤维素(MCC)与一氯乙酸反应制备羧甲基纤维素(CMC),并以丙烯酰胺(AM)为单体,过硫酸钾、亚硫酸氢钠为引发剂,N,N-亚甲基双丙烯酰胺(MBA)为交联剂,制备用于从废水中吸附重金属离子的羧甲基纤维素-丙烯酰胺P(CMC-AM)。考察了废水pH、温度、吸附时间对P(CMC-AM)吸附Zn^(2+)、Cr(Ⅵ)的影响,并通过等温吸附模型和动力学吸附模型分析了吸附机制。结果表明:所制备的P(MCC-AM)是一种表面有多孔结构的高分子材料,在温度25℃、溶液pH=6、吸附时间90 min条件下对重金属离子有较好的吸附性能;吸附过程与准二级动力学模型和Langmuir等温吸附模型拟合较好,对Zn^(2+)和Cr(Ⅵ)的吸附属单分子层化学吸附。该材料可用于处理含重金属离子的废水。
Preparation of carboxymethyl cellulose(CMC)by the reaction of microcrystalline cellulose(MCC)with monochloroacetic acid was studied,and using acrylamide(AM)as monomer,potassium persulfate and sodium bisulfite as initiators,N,N′-methylenebiacrylamide(MBA)as crosslinkers,the carboxymethyl cellulose-acrylamide P(CMC-AM)was preparated and used for adsorption heavy metal ions from wastewater was investigated.The effects of wastewater pH,temperature and adsorption time on P(CMC-AM)adsorption Zn 2+and Cr(Ⅵ)were examined.The adsorption mechanism was analyzed by isothermal adsorption model and kinetic adsorption model.The results show that the prepared P(MCC-AM)is a polymer material with a porous surface structure,which has good adsorption performance for heavy metal ions under the conditions of 25℃,solution pH of 6.0 and adsorption time of 90 min,the adsorption process is well fitted with the pseudo-second-order kinetic model and Langmuir adsorption isotherm model,and the adsorption of Zn ^(2+)and Cr(Ⅵ)is a single-molecular layer chemical adsorption.The material can be used to treat wastewater containing heavy metal ions.
作者
刘军
李旺育
LIU Jun;LI Wangyu(School of Municipal and Environmental Engineering,Shenyang Jianzhu University,Shenyang 110168,China)
出处
《湿法冶金》
CAS
北大核心
2022年第4期366-371,共6页
Hydrometallurgy of China
基金
场地土壤生态环境损害调查技术研究项目(2018YFC1801203)。
关键词
微晶纤维素
改性
废水
重金属离子
吸附
锌
铬
microcrystalline cellulose
modification
wastewater
heavy metal ions
adsorption
zinc
chromium
