ZnCl2/AlCl3改性生物炭的甲基紫吸附特性研究  

Study on adsorption characteristics of methyl violet by biochar modified by ZnCl/AlCl

作　　者：吴丹萍 李海红[1] 张田田 Wu Danping;Li Haihong;Zhang Tiantian(College of Environmental and Chemical Engineering,Xi'an Polytechnic University,Xi'an 710048;Shenzhen Guanghui Yuan Environmental Water Co.,Ltd.,Shenzhen 518001)

机构地区：[1]西安工程大学环境与化学工程学院,西安710048 [2]深圳市广汇源环境水务有限公司,深圳518001

出　　处：《化工新型材料》2020年第8期227-231,238,共6页New Chemical Materials

基　　金：陕西省科技厅社会发展领域项目(2020SF-435);柯桥纺织产业创新研究院项目(19KQYB04);陕西省“三秦学者”基金项目(2017-4)。

摘　　要：采用高温热解法制备ZnCl2/AlCl3改性棉秆基活性炭并吸附甲基紫。探究了样品投加量、反应接触时间、甲基紫浓度、吸附温度和溶液pH对甲基紫吸附率的影响,并研究了其吸附动力学、热力学及吸附等温线模型。结果表明:甲基紫的吸附最佳条件为样品投加量40mg、反应接触时间120min、甲基紫浓度100mg/L、吸附温度25℃、溶液pH为7。吸附过程符合伪二级动力学方程和Freundlich吸附等温模型;吸附总速率由外部液膜扩散作用控制;吸附过程为吸热熵增吸附,即温度的升高有利于吸附的进行。The cotton stalk activated carbon(AC)modified by ZnCl2/AlCl3 was prepared with high temperature pyrolysis.It was used to adsorb methyl violet.Exploring the impact about adsorption rate of methyl violet:the dosage of AC,reaction time,concentration of methyl violet,temperature and pH.And exploring the sorption kinetics,the adsorption thermodynamics and the adsorption isotherms.The results showed that the optimum adsorption conditions of methyl violet by AC were as follows:AC dosage was 40 mg,the reaction time was 120 min,the concentration of methyl violet was 100 mg/L,the temperature was 25℃,and the pH was 7.The adsorption process accorded with the pseudo-second-order kinetic equation and Freundlich adsorption isotherm model,the total adsorption rate was controlled by the diffusion of external liquid membrane,and the adsorption process was endothermic entropy adsorption.

关 键 词：棉秆基活性炭 甲基紫 吸附动力学 吸附等温线 

分 类 号：TQ424.1[化学工程]