柚皮粉复合高吸水树脂吸附溶液中Cu2

研究了柚皮粉接枝聚丙烯酸-聚丙烯酰胺复合高吸水树脂（PP-SA）对Cu2 的吸附行为及机理。考察了吸附时间及硫酸铜初始质量浓度对PP-SA铜离子吸附容量的影响，并对其吸附Cu2 过程进行了热力学等温线及动力学方程拟合，应用X射线光电子能谱（XPS）及热重分析（TG）技术对吸附Cu2 溶液饱和的PP-SA做了表征，探讨了其吸附Cu2 机理。结果表明硫酸铜初始质量浓度为2000 mg/L时PP-SA铜离子吸附容量最大，可达199.3 mg/g，吸附约4 h即达饱和；PP-SA对Cu2 的吸附等温线符合Langmuir吸附等温式，吸附动力学符合准二级动力学方程；PP-SA对Cu2 的吸附主要通过离子交换、螯合作用及静电吸引实现，被吸附的铜物种以Cu2 形式存在，其中有小部分CuSO4。

Research on behaviors and mechanism of Pomelo Peel Powder Composite Superabsorbent Absorbing Cu2 in Solution

Adsorption behaviors and mechanism of Cu2 in solution by Pomelo peel powder composite superabsorbent (PP-SA) were studied. The influences of intial CuSO4 concentration and adsorption time on Cu2 adsorption capacity of PP-SA were investigated. The thermodynamic adsorption isotherms and adsorption kinetics models were adopted to fit the data. PP-SA saturated with Cu2 was characterized by X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TG) and the adsorption mechanisms were proposed. The results showed that the adsorption capacity of Cu2 for PP-SA in 2000 mg/L CuSO4 solution was the highest, reaching to 199.3 mg/g in about 4 h. The Cu2 adsorption process followed the pseudo-second-order kinetic model and the data were fitted to the Langmuir isotherms. The Cu2 adsorption on PP-SA can be achieved by ion exchange adsorption, chelation and electrostatic attraction. The copper species absorbed in PP-SA exist as Cu2 , a small part of which is CuSO4.