聚丙烯酸/板栗壳色素水凝胶吸附水中Pb(Ⅱ)研究  

Pb(II)Adsorption from Water onto Polyacrylic Acid/Chestnut Shell Pigment Hydrogel

作　　者：黄剑 宋维峰[2] 姚增玉[1] Huang Jian;Song Weifeng;Yao Zengyu(Key Laboratory of Ministry of Education on Forest Resources Conservation and Utilization in the Southwest Mountains of China,Southwest Forestry University,Kunming Yunnan 650233,China;College of Ecology and Environment,Southwest Forestry University,Kunming Yunnan 650233,China)

机构地区：[1]西南林业大学西南山地森林资源保育与利用教育部重点实验室,云南昆明650233 [2]西南林业大学生态与环境学院,云南昆明650233

出　　处：《西南林业大学学报（自然科学）》2023年第4期188-196,共9页Journal of Southwest Forestry University：Natural Sciences

基　　金：云南省农业基础研究联合专项(2018FG001-008)资助。

摘　　要：利用板栗壳色素和丙烯酸合成水凝胶用于吸附水中的铅,分析合成工艺中板栗壳色素用量以及吸附工艺中溶液pH、初始浓度、吸附时间等因素对该水凝胶吸附Pb(Ⅱ)性能的影响,探讨吸附动力学和吸附等温平衡特征。结果表明:底物配比以m_(板栗壳色素)∶m_(丙烯酸)=0.128为最好,此时所合成水凝胶对Pb(Ⅱ)的吸附量是不加入板栗壳色素的聚丙烯酸水凝胶的1.263倍。该水凝胶具有三维网状结构,pH_(pzc)为4.2,氨基、羧基和羟基是Pb(Ⅱ)的结合位点,适宜的吸附pH为5.6。吸附过程在120 min内达到平衡,符合准二级动力学模型,化学吸附是限速步骤。吸附平衡符合Langmuir等温线模型,最大单层饱和吸附容量达到315.6 mg/g。因此,聚丙烯酸/板栗壳色素水凝胶是一种很有应用潜力的Pb(Ⅱ)吸附剂。The synthetic hydrogel with chestnut shell pigment and polyacrylic acid for lead removal from aqueous solutions.The effects of the amount of chestnut shell pigment in the synthesis process,solution pH,initial Pb(Ⅱ)concentration,and adsorption time on the adsorption of hydrogel for Pb(Ⅱ)were analyzed.The adsorption kinetics and adsorption isotherm were investigated.The findings revealed that the best ratio of chestnut shell pigment:acrylic acid was=0.128 g/g at which the Pb(Ⅱ)adsorption capacity on the as-synthesized hydrogel was 1.263 times that of the hydrogel without chestnut shell pigment.The hydrogel had a three-dimensional network structure with a pH point of zero charges of 4.2.Amino,carboxyl,and hydroxyl groups were the Pb(Ⅱ)-binding sites.The suitable solution pH for the adsorption was 5.6.The adsorption process reached equilibrium within 120 min.The kinetic data conformed to the pseudo-second-order model,suggesting that chemical adsorption was the rate-limiting step.The adsorption equilibrium followed the Langmuir isothermal model with the maximum singlelayer adsorption capacity of 315.6 mg/g.The results suggest that the hydrogel of polyacrylic acid/chestnut shell pigment is an excellent adsorbent with great application potential for Pb(Ⅱ)removal.

关 键 词：板栗壳色素 丙烯酸 水凝胶 吸附剂 铅 

分 类 号：TQ424[化学工程]