UiO-66改性对正己烷的吸附性能研究  

Study on performance of UiO-66 modified adsorbent to n-hexane

作　　者：徐奥 李旭飞[1] 黄维秋[1] Xu Ao;Li Xufei;Huang Weiqiu(Jiangsu Provincial Key Laboratory of Oil and Gas Storage and Transportation Technology,Changzhou University,Changzhou 213164)

机构地区：[1]常州大学江苏省油气储运技术重点实验室,常州213164

出　　处：《化工新型材料》2022年第1期211-216,共6页New Chemical Materials

基　　金：国家自然科学基金(51574044);江苏省重点研发计划(产业前瞻与共性关键技术)重点项目(BE2018065)。

摘　　要：石化行业及生产生活中不可避免的排放挥发性有机物(VOCs),油气是常见的VOCs来源,其主要轻质组分是己烷。吸附法是常见的去除VOCs的方法,成本低效率高。为了提升吸附剂的吸附效率,使用溶剂热法制备了UiO-66和UiO-66-NH_(2),并使用苯甲酸进行缺陷合成改变其孔结构与比表面积,并对其进行了77K氮气(N_(2))、273K CO_(2)吸附测试,通过X射线衍射、扫描电子显微镜以及热重分析等手段进行表征分析。在30℃、80℃、120℃这3个典型温度下进行正己烷吸附测试及耐久性测试。结果表明:所制UiO-66的BET比表面积可高达1688.57m^(2)/g,1∶20当量苯甲酸改性UiO-66吸附容量高达4.47mmol/g,且具有优秀的稳定性。随着温度变化,不同孔径分布在不同温度环境下的吸附剂性能衰减不同。Volatile organic compounds(VOCs) are inevitably emitted in the petrochemical industry,production and vapor.Oil vapor is a common source of VOCs and its main light component is hexane.The adsorption method is a common method to remove VOCs with low cost and high efficiency.In order to improve the adsorption efficiency of the adsorbent,UiO-66 and UiO-66-NH_(2) were prepared by solvothermal method,and benzoic acid was used for defect synthesis to change their pore structure and specific surface area.The samples were characteried by 77 K nitrogen(N_(2)),273 K carbon dioxide(CO_(2)) adsorption,X-ray diffraction(XRD),scanning electron microscope observation(SEM) and thermogravimetric analysis(TG).The n-hexane adsorption test and durability test were performed at three typical temperatures of 30℃,80℃,and 120℃.The results shown that the BET specific surface area of the prepared UiO-66 can be as high as 1688.57 m^(2)/g,the adsorption capacity was as high as 4.47 mmol/g and it had excellent stability.As the temperature changes,the performance degradation of adsorbents with different pore size distributions in different temperature environments was varied.

关 键 词：UiO-66 苯甲酸 正己烷 吸附 缺陷合成 孔径 

分 类 号：X701[环境科学与工程—环境工程] TQ424[化学工程]