山竹壳粉吸附亚甲基蓝性能研究

Performance of Mangosteen Shell Powder Absorbing Methylene Blue

研究了山竹壳粉吸附亚甲基蓝的吸附性能,考察了亚甲基蓝溶液的p H、不同初始浓度、吸附时间、温度等条件对吸附效果的影响。应用准一级动力学方程、准二级动力学方程、颗粒扩散方程模拟了山竹壳粉吸附亚甲基蓝的动力学过程,结果表明准二级动力学方程适合描述整个吸附过程。用Langmuir和Freundlich模型模拟吸附等温线,Langmuir方程更适合描述此吸附过程,在298K下最大单层吸附量为88.49mg/g。计算了吉布斯自由能(ΔG^0)、焓变(ΔH^0)、熵变(ΔS^0)、吸附势(E)等热力学参数,ΔG^0、ΔH^0、ΔS^0均<0,说明此吸附过程是一个自发进行的、放热的、趋于有序的吸附过程。

This paper mainly focused on the performance of mangosteen shell powder absorbing methylene blue in different pH , different initial concentration, different period, and different temperature. The quasi - order kinetic equation, quasi - second - order equation, the particle diffusion equation were applied separately to simulate the kinetics process of the absorption. The results showed that the pseudo - second kinetic equation was suitable for de-scribing the whole desorption process. Langmuir equation and Freundlich equation were used to simulate the kinet-ics process of the absorption. It showed that Langmuir equation was more suitable for describing the whole desorp-tion process. The maximum monolayer adsorption capacity was 88. 49m g / g at 298K . The △G^0,△H^0,△S^0 were less than 0 by calculating the thermodynamic parameters of Gibbs free energy （ △G^0 , enthalpy （ △H^0） , entropy change （△S^0）,adsorption potential （ E ） , which indicated that this adsorption process was a spontaneous, exothermic, nearly ordered adsorption process.