摘要
以花生壳为原料,甲醛为改性剂,对花生壳进行改性制备吸附剂,并对其吸附水溶液中Pb2+的动力学和热力学特性进行了研究。结果表明,在298 K温度下,花生壳对Pb2+的吸附符合拟二级动力学方程,颗粒内扩散过程为吸附的主要速率控制步骤。在实验温度下,改性花生壳对Pb2+的吸附平衡符合Langmuir等温方程,热力学研究表明,吸附焓变△H=19.67 kJ/mol,熵变△S=77.71 J/(mol.K),反应吉布斯自由能△G<0。热力学参数表明,该吸附过程为自发进行的吸热过程。
Peanut hull which was modified by formaldehyde in acidic solution was used to adsorb Pb2＋,with the study of adsorption kinetics and thermodynamics of Pb2＋ from aqueous solution.Results indicated that under the temperature of 298 K,the adsorption of Pb2＋ by modified peanut hull followed the pseudo-second order kinetic model.At the experimental temperature,thermodynamics adsorption data were well described by Langmuir adsorption isotherm equation,with the enthalpy as 19.67 kJ/mol and entropy as 77.71 J/（mol·K）,and the thermodynamics indicated the adsorption process is a spontaneous endothermic nature.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2011年第8期57-60,共4页
Environmental Science & Technology
