摘要
制备了淀粉基高吸水性树脂,并采用等温吸附模型和吸附动力学系统研究了其对重金属离子Cr^(6+)、Co^(2+)、Ni^(2+)的吸附特性。结果表明,在单组分体系中,树脂对3种重金属离子的吸附行为均符合Langmuir等温吸附模型,吸附等温线呈典型的H型特征,吸附量顺序为Cr^(6+)>Co^(2+)>Ni^(2+),树脂的选择性吸附特性与重金属离子的电负性、荷径比、水合离子半径等物化参数相关;在多组分体系中存在竞争吸附效应,其中对Cr^(6+)的吸附行为符合Langmuir等温吸附模型,对Co^(2+)和Ni^(2+)的吸附与经典等温吸附模型匹配度不高;树脂对3种重金属离子的吸附行为更符合准二级动力学模型,表明化学吸附是其主导作用机制。
We prepared starch-based superabsorbent resin,and systematically investigated its adsorption characteristics towards heavy metal ions Cr^(6+),Co^(2+),and Ni^(2+)by using isothermal adsorption model and adsorption kinetics.The results show that,in the single-component system,the adsorption behavior of three heavy metal ions on the resin is consistent with Langmuir isothermal adsorption model,and the adsorption isotherms exhibit typical H-type characteristics.The adsorption capacity follows the order of Cr^(6+)>Co^(2+)>Ni^(2+),indicating that selective adsorption is correlated with the physicochemical properties of the heavy metal ions,including electronegativity,charge-to-radius ratio,and hydrated ionic radius.Competitive adsorption effects exist in the multi-component system.The adsorption behavior of Cr^(6+)is consistent with the Langmuir isothermal adsorption model,while the adsorption behavior of Co^(2+)and Ni^(2+)is not well matched with the classical isothermal adsorption model.The adsorption behavior of three heavy metal ions on the resin is more consistent with the pseudo-second-order kinetic model,indicating that chemisorption is the dominant adsorption mechanism.
作者
回增帅
范文玉
段佳一
刘佳琚
HUI Zengshuai;FAN Wenyu;DUAN Jiayi;LIU Jiaju(College of Environmental and Safety Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)
出处
《化学与生物工程》
北大核心
2025年第7期58-63,共6页
Chemistry & Bioengineering
基金
辽宁省应用基础研究计划项目(2023JH2/101300047)。
关键词
高吸水性树脂
重金属离子
单一吸附
竞争吸附
等温吸附模型
superabsorbent resin
heavy metal ion
single adsorption
competitive adsorption
isothermal adsorption model
