沸石咪唑酯骨架-8的制备及其对刚果红的吸附性能  

Preparation of zeolitic imidazolate framework-8 andits adsorption performance on Congo Red

作　　者：杨亮[1] 孔韩韩 李韦霖 祁小芬 张天芸 王雪梅[1] 李文全 YANG Liang;KONG Hanhan;LI Weilin;QI Xiaofen;ZHANG Tianyun;WANG Xuemei;LI Wenquan(School of Mechanical and Electronical Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;Lanzhou Sanmao Industrial Co.,Ltd.,Lanzhou,Gansu 730316,China)

机构地区：[1]兰州理工大学机电工程学院,甘肃兰州730050 [2]兰州三毛实业有限公司,甘肃兰州730316

出　　处：《纺织学报》2024年第7期140-149,共10页Journal of Textile Research

基　　金：甘肃省自然科学基金项目(22JR5RA259)。

摘　　要：为制备印染废水的吸附材料,以六水合硝酸锌和2-甲基咪唑为原材料,以去离子水作溶剂,采用水溶剂法制备沸石咪唑酯骨架-8(ZIF-8)材料。借助扫描电子显微镜、红外光谱仪、X射线衍射仪等探究ZIF-8材料的结构,测试其对阴离子刚果红染料的吸附性能,并分析其吸附机制。结果表明:ZIF-8颗粒大小均匀,表面光滑,呈多面体结构;其热裂解温度为258℃,具有良好的热稳定性;ZIF-8对刚果红的吸附更符合准二级动力学模型和Langmuir吸附等温线模型,即以化学吸附为主且吸附位点等效;吸附过程为自发进行的放热反应,低温有利于吸附;在温度为20℃、pH值为7的条件下,ZIF-8对95 mg/L的刚果红溶液的吸附效果最佳,吸附量可达671.41 mg/g。Objective In order to solve the problem that printing and dyeing wastewater is harmful to the environment and difficult to treat,this research aims to prepare an economical and environmentally friendly adsorbent with excellent adsorption effect,and the adsorption performance of ZIF-8 on azo dyes represented by anionic Congo Red dyes was investigated.Method In this research,2-methylimidazole and Zn(NO 3)2·6H 2O were used as raw materials,and deionized water was used as solvent.The proportion of 2-methylimidazole,Zn(NO 3)2·6H 2O and deionized water was adjusted and they mixed by mechanical stirring to prepare the homogeneous and clear particles of zeolitic imidazolate framework-8(ZIF-8)material under normal temperature and normal pressure conditions.The structure of the ZIF-8 material was tested by scanning electron microscopy(SEM),infrared spectrometry,X-Ray diffraction,thermogravimetry,BET and other characterization methods.The adsorption performance of the material on dyes was evaluated by the water-bath constant-temperature shaking method,and the factors affecting the adsorption and the adsorption mechanism were analyzed.Results It was found from SEM images that the ZIF-8 section was smooth,and that the particles were uniform and had a polyhedral structure.Infrared spectra analysis and X-Ray diffraction results showed that the ZIF-8 material was consistent with the finding reported in docoments.Thermogravimetric analysis and specific surface area tests revealed that the thermal cleavage temperature of the ZIF-8 material was 258℃,and the ZIF-8 had a good thermal stability.The specific surface area of BET was 869.63 m 2/g,the specific surface area of Langmuir was 1140.03 m 2/g,and the average pore size was 3.27 nm.The adsorption equilibrium was reached in a shorter time at the lower initial concentration,and the adsorption amount reached the maximum when the initial concentration was 95 mg/L.It was found that the adsorption would first rise,then fall and finally tend to equilibrium with the increase of ion co

关 键 词：沸石咪唑酯骨架-8 刚果红 阴离子染料 印染废水 废水处理 吸附性能 吸附机制 

分 类 号：TS176[轻工技术与工程—纺织材料与纺织品设计]