摘要
以不同配比的羧甲基纤维素钠(CMC)和丙烯酰胺(AM)为原料,以N,N-亚甲基双丙烯酰胺(MBA)为交联剂,过硫酸钠为引发剂,通过自由基聚合法合成4种水凝胶(吸附剂),分别命名为CMC1-AM、CMC2-AM、CMC3-AM、CMC_(4)-AM,并考察吸附剂含量、pH、温度、盐分等因素对水凝胶吸附水中Pb^(2+)的影响。结果表明:CMC_(4)-AM水凝胶对水中Pb^(2+)吸附效果最好,在初始Pb^(2+)浓度为50mg/L,吸附剂含量为1.5g/L,pH=7,温度为15℃,无盐分条件下,Pb^(2+)的去除率最高,可以达到89.6%。CMC_(4)-AM水凝胶最大吸附容量为53.2mg/g,吸附过程符合准二级动力学模型和Langmuir吸附等温模型,吸附过程是受化学吸附所控制的单分子层吸附。
Four kinds of hydrogels were synthesized by free radical polymerization with different proportions of carboxymethyl cellulose sodium(CMC)and acrylamide(AM)as raw materials,N,N-methylene bis acrylamide(MBA)as crosslinking agent and sodium persulfate as initiator.They were named CMC1-AM,CMC2-AM,CMC3-AM and CMC_(4)-AM respectively.The effects of sorbent content,pH,temperature and salinity on the Pb^(2+)adsorption of the hydrogel were investigated.The results showed that CMC_(4)-AM hydrogel had the best adsorption effect on Pb^(2+).When the initial Pb^(2+)concentration was 50mg/L,the adsorbent content was 1.5g/L,the temperature was 25℃,pH=7,without salt,the removal rate of Pb^(2+)was the highest,which could reach 89.6%.The maximum adsorption capacity of CMC_(4)-AM hydrogel was 53.2mg/g,and the adsorption process accorded with the quasi two level kinetic model and the Langmuir adsorption isothermal model.The adsorption process was controlled by chemisorption of monolayer adsorption.
作者
王伟斌
刘东方
冯德茂
刘振波
李松荣
Wang Weibin;Liu Dongfang;Feng Demao;Liu Zhenbo;Li Songrong(College of Environmental Science and Engineering of Nankai University,Tianjin 300350;Tianjin Maolian Science&Technology Co.,Ltd.,Tianjin 300280)
出处
《化工新型材料》
CAS
CSCD
北大核心
2021年第5期195-199,共5页
New Chemical Materials
基金
国家科技重大专项(2017ZX07107-002)。
