ZnCl2活化废旧涤纶基活性炭的制备及吸附性能
Preparation and adsorption properties of waste polyester-based activated carbon activated by ZnCl2
张帮程 1王立2
作者信息
- 1. 徐州市第一中学,江苏徐州 221100
- 2. 徐州工程学院材料与化学工程学院,江苏徐州 221100
- 折叠
摘要
为了实现废旧涤纶织物的资源化利用,通过ZnCl2活化-高温热解的方法制备了废旧涤纶基活性炭(WPT-AC),采用XRD、FT-IR和BET等表征技术对其物相晶型、特征基团、比表面积和孔隙结构进行了表征,通过正交试验确定了制备WPT-AC的最优工艺,评价了WPT-AC吸附亚甲基蓝(MB)性能并分析了吸附机理.结果表明:在质量分数为45%的ZnCl2溶液、热解温度为900℃、升温速率为5℃/min和热解时间为90 min的最优工艺条件下,制备的WPT-AC比表面积高达1 089.72 m2/g、产率为58.45%.丰富的孔隙结构有利于提高其对污染物的吸附.在WPT-AC投加量为2.0 g/L、MB初始质量浓度为500 mg/L、吸附温度为40℃、吸附时间为80 min的条件下,WPT-AC对MB的去除率为97.49%.WPT-AC对土霉素(CIP)同样具有较好的吸附效果,且Ni(Ⅱ)共存条件下由于静电吸引的存在有利于吸附性能的提高.准二级动力学模型和Langmuir等温吸附模型更适合拟合WPT-AC吸附MB过程.
Abstract
In order to realize the resource utilization of waste polyester fabrics,waste polyester-based activated carbon(WPT-AC)was prepared by ZnCl2 activation-high temperature pyrolysis method.The crystal phase,characteristic groups and specific surface area pore structure of WPT-AC were characterized by XRD,FT-IR and BET.The optimal process for preparing WPT-AC was determined by orthogonal experiment.The adsorption performance of WPT-AC for methylene blue(MB)was evaluated and the adsorption mechanism was analyzed.The results showed that the specific surface area of WPT-AC prepared under the optimal process conditions of 45% ZnCl2 solution,pyrolysis temperature of 900℃,heating rate of 5℃/min and pyrolysis time of 90 min was as high as 1 089.72 m2/g,and the yield was 58.45% .The abundant pore structure was beneficial to improve the adsorption of pollutants.The removal rate of MB by WPT-AC was 97.49% under the condi-tions of WPT-AC dosage of 2.0 g/L,initial concentration of MB of 500 mg/L,adsorption temperature of 40℃and adsorp-tion time of 80 min.WPT-AC also had a good adsorption effect on oxytetracycline(CIP),and the presence of electrostatic at-traction was beneficial to the improvement of adsorption performance under the condition of Ni(Ⅱ)coexistence.The quasi-second-order kinetic model and Langmuir isothermal adsorption model of WPT-AC were more suitable for fitting the MB ad-sorption process of WPT-AC.
关键词
废旧涤纶基活性炭/吸附/亚甲基蓝/氯化锌活化/高温热解Key words
waste polyester-based activated carbon/adsorption/methylene blue/zinc chloride activation/high temperature pyrolysis引用本文复制引用
基金项目
徐州工程学院高等教育科学研究课题(YGJ-SZ-21142)
出版年
2024
NETL
NSTL
万方数据