论文部分内容阅读
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。
The kinetics and thermodynamic properties of the feather protein-poly (acrylic acid-acrylamide) superabsorbent resin for Cd 2+ adsorption were studied. Kinetic studies have shown that the adsorption of Cd2 + resin, while its own water absorption first increased and then decreased, the adsorption process in line with the quasi-second-order kinetic model. The Langmuir isotherm equation can well fit the adsorption behavior of Cd2 + on the resin at different temperatures. The adsorption equilibrium constant increases with the increase of temperature. Thermodynamic studies show that the adsorption enthalpy ΔH is positive, the adsorption free energy ΔG is negative, the adsorption entropy change ΔS is positive, so the adsorption of Cd2 + is an endothermic, entropy Increase the spontaneous process, warming is conducive to the adsorption.