羽毛蛋白基高吸水性树脂吸附Cd^(2+)的动力学和热力学研究  

Kinetics and thermodynamics of Cd^(2+) adsorption onto feather protein based superabsorbent resins

作　　者：何明[1] 尹国强[1] 王品[2] 张步宁[1] 

机构地区：[1]仲恺农业工程学院绿色化工研究所,广州510225 [2]仲恺农业工程学院环境科学与工程学院,广州510225

出　　处：《化工新型材料》2013年第6期72-74,95,共4页New Chemical Materials

基　　金：国家自然科学基金资助项目(20776164);(21176269);广东省自然科学基金资助项目(9251022501000003)

摘　　要：研究了羽毛蛋白-聚(丙烯酸-丙烯酰胺)高吸水性树脂吸附Cd2+的动力学和热力学特性。动力学研究表明,树脂在吸附Cd2+的同时,自身的吸水率先增大后减小,吸附过程符合准二级动力学模型。Langmuir等温吸附方程能较好地拟合不同温度下Cd2+在树脂上的吸附行为,吸附平衡常数随着温度的升高而增大。热力学研究表明,在本实验研究范围内,吸附焓变ΔH为正值,吸附自由能变ΔG为负值,吸附熵变ΔS为正值,因此,树脂对Cd2+的吸附是一个吸热的、熵增加的自发过程,升温有利于吸附的进行。Kinetics and thermodynamics of Cd2＋ adsorption onto feather protein grafted poly（acrylic acid-acrylam- ide） superabsorbent polymers were investigated. During the adsorption process,the water absorbency of the copolymers was increased in the beginning and then decreased. Kinetics study indicated that Cd2＋ adsorption followed the pseudo second-or- der kinetic model. The adsorption data fitted the Langmuir adsorption isotherm in the temperature range of 283-333K. The adsorption equilibrium constant increased with the increasing of temperature. Thermodynamic study showed that the param- eters of adsorption： AH0, AG〈0, AS〉0. Thus the adsorption behavior for Cd2＋ was a spontaneous, endothermic and en- tropy increasing process,and increasing temperature would benefit the adsorntinn

关 键 词：高吸水性树脂 羽毛蛋白 吸附 动力学 等温吸附线 热力学 

分 类 号：TQ028.15[化学工程]