开心果壳基活性炭的制备及其吸附性能研究

Preparation and Adsorption Properties of Pistachio Shell-based Activated Carbon

本文以开心果壳为原料,采用化学活化法制备开心果壳基活性炭。将干燥的开心果壳在450℃管式炉炭化4 h,将活化剂KOH和炭化后的开心果壳粉按照质量比1∶1混合研磨,在800℃条件下活化2 h制备活性炭。采用傅里叶变换红外光谱仪表征活性炭表面官能团,并研究了pH值、亚甲基蓝初始浓度、温度及吸附时间对开心果壳基活性炭吸附亚甲基蓝的影响。结果表明,开心果壳基活性炭对亚甲基蓝的吸附效果良好,Langmuir等温吸附模型和准二级吸附动力学方程能较好地拟合吸附过程,开心果壳基活性炭对亚甲基蓝的吸附反应为吸热反应,自发进行。

In this paper,pistachio shell was used as raw material,and pistachio shell-based activated carbon was prepared by chemical activation method.In order to prepare activated carbon,the dry pistachio shells were carbonized at 450℃for 4 hours in a tube furnace,activator KOH and carbonized pistachio shell were mixed and ground according to the mass ratio of 1∶1,and then activated at 800℃for 2 hours.Fourier exchange infrared spectroscopy was used to characterize the surface functional groups of activated carbon.The effects of pH value,initial concentration of methylene blue,temperature and adsorption time on the adsorption of methylene blue by pistachio shell-based activated carbon were studied.The results showed that the adsorption effect of pistachio shell-based activated carbon on methylene blue was good,and the Langmuir adsorption isotherm model and pseudo-second-order adsorption kinetic equation could fit the adsorption process well.The adsorption reaction of pistachio shell-based activated carbon on methylene blue was endothermic and spontaneous.