花椒籽废渣制备活性炭及其对对硝基苯酚的吸附行为  

Preparation of activated carbon from waste residue of Chinese prickly ash seeds and its adsorption properties for p-nitrophenol

作　　者：查飞[1] 于霞[1] 朱钰[1] 郑海蓉 王亚飞[1] 

机构地区：[1]西北师范大学化学化工学院,甘肃兰州730070 [2]张掖市环保局,甘肃张掖734000

出　　处：《西北师范大学学报（自然科学版）》2016年第2期60-67,共8页Journal of Northwest Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(21161017)

摘　　要：以花椒籽废渣为原料,在N2气氛下用ZnCl2活化制备了活性炭,采用FT-IR,BET,XRD,SEM和TG对制备的活性炭进行了表征.在碳化温度700℃、碳化时间60min、ZnCl2浓度50%(质量比)、ZnCl2溶液与花椒籽废渣质量比为1.5的条件下,制备的活性炭具有高度破裂的多孔表面,比表面积为883.4m2·g-1,总孔体积为0.55cm3·g-1,平均孔径为2.47nm.以制得的活性炭为吸附剂,研究了其对对硝基苯酚的吸附行为.结果表明,在吸附剂投加量为0.5g·L-1、温度293K、pH=8.0、吸附时间为6h时,制备的活性炭对对硝基苯酚的吸附容量为334mg·g-1,吸附可用Sips等温方程较好模拟,吸附为自发的吸热过程,吸附符合准二级动力学模型.Activated carbons are prepared from waste residue of Chinese prickly ash seeds activated by ZnCl2 in N2atmosphere.It is characterized by the methods of FT-IR,BET,XRD,SEM and TG.Under the conditions that ZnCl2 concentration is 50%（mass ratio）,weight ratio of ZnCl2 to waste residue of Chinese prickly ash seeds is 1.5,carbonization time is 60 min and carbonization temperature is at 700 ℃,activated carbons prepared have highly cracked porous surfaces,grooves and macroporous.The BET surface area,total pore volume and pore volume are 883.4 m2·g^-1,0.55cm3·g^-1 and 2.47 nm,respectively.It is used as adsorbent for the removal of p-nitrophenol from aqueous solution.The adsorption capacity can be achieved to 334mg·g^-1 at adsorbent dose of 0.5g·L^-1,adsorption temperature at 293 K,solution pH of 8.0and reaction time of 6h.Thermodynamic study shows that the adsorption process can be favorably described by the Sips isotherm equation.Thermodynamic function calculated shows that the adsorption is a spontaneous and endothermic process.The adsorption kinetics can be satisfactory fitted by the pseudo-second-order model.

关 键 词：花椒籽废渣 活性炭 对硝基苯酚 吸附热力学 吸附动力学 

分 类 号：TQ351[化学工程] TQ424