摘要
为探究D311树脂在酸性条件下对重金属Cu(Ⅱ)的去除性能,通过吸附动力学模型(准一级动力学模型、准二级动力学模型、Elovich模型和颗粒内扩散模型)、吸附等温模型(Langmuir,Freundlich,Temkin,Redlich-Peterson和Koble-Corrigan)、吸附热力学模型和位点能量分布理论分析了D311树脂吸附Cu(Ⅱ)的机理。研究结果表明,D311树脂对Cu(Ⅱ)的吸附在6 h内基本达到平衡,该吸附过程更为符合Elovich模型和Freundlich模型。在318 K时的最大Cu(Ⅱ)吸附量为74.98 mg/g,且热力学参数显示该吸附过程为吸热反应。从位点能量分布角度考察,在固定吸附能的条件下,位点分布函数大小顺序为318 K>308 K>298 K,也揭示了D311树脂吸附Cu(Ⅱ)为吸热过程。基于X射线光电子能谱和红外光谱数据分析,D311树脂对Cu(Ⅱ)的吸附机制主要是化学沉淀和内层络合作用。
To remove Cu(Ⅱ)from aqueous solution under acidic conditions(pH=5.25),a commercial porous D311 resin was applied and characterized.The removal mechanisms of Cu(Ⅱ)on the D311 resin was studied by adsorption kinetics(pseduo-first-order,pseduo-second-order,Elovich and intra-partical diffusion model),adsorption isothermal models(Langmuir,Freundlich,Temkin,Redlich-Peterson and Koble-Corrigan),adsorption thermodynamics and site energy distribution theory.The results demonstrate that the adsorption equilibrium is achieved within 6 h.The adsorptions of Cu(Ⅱ)on the D311 resin could be better described by the Elovich model and Freundlich model,and the maximum adsorption capacity of D311 resin is 74.98 mg/g at 318 K.The thermodynamics results show it is a endothermic reaction(ΔH>0).From the site energy distribution,the site energy distribution function is in the order of 318 K>308 K>298 K at a fixed value of adsorption energy,which indicates that the Cu(Ⅱ)adsorption behavior is an endothermic process yet.Based on XPS and FT-IR analysis,the sorption mechanism was mainly attributed to the chemical precipitation and the inner-sphere complexation.
作者
李海斌
谢发之
张克华
李国莲
陈庆典
董伟伟
程成
刘群
Haibin Li;Fazhi Xie;Kehua Zhang;Guolian Li;Qingdian Chen;Weiwei Dong;Cheng Cheng;Qun Liu(School of Materials and Chemical Engineering,Anhui Jianzhu University,Hefei 230601,China;Anhui Key Laboratory of Water Pollution Control and Wastewater Resource,Hefei 230601,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2020年第6期39-47,54,共10页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(21777001)
安徽省教育厅一般项目(KJ2018JD17)
安徽建筑大学校级青年基金(2017XQZ08)
安徽建筑大学开放实验室项目(2017kf06)。
