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
出处
《化工新型材料》
CAS
CSCD
北大核心
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)
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
superabsorbent resin, feather protein, adsorption, kinetics, adsorption isotherm, thermodynamics
