摘要
Zr基MOF因具有良好的水热稳定性和一定的酸碱稳定性,被广泛应用于气体的存储分离、药物传输、化学传感以及催化等领域,近年来MOF与等离子体的相互作用也多有研究。本工作以典型UiO-66、UiO-67和UiO-66-NH 2为研究对象,探究了它们在大气压介质阻挡放电(DBD)等离子体中的稳定性。采用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和氮气吸附脱附等温线(BET)分析等离子体处理前后样品的结构和比表面积变化。在三种Zr基MOF中,UiO-66在等离子体中的稳定性最好;UiO-67在等离子体处理后骨架结构部分被破坏,且比表面积仅为等离子体处理前的19.0%;UiO-66-NH 2的骨架结构基本被破坏,且比表面积仅为等离子体处理前的3.1%。这说明UiO-67和UiO-66-NH 2在CO 2、H 2混合气体等离子体放电后不能稳定存在。处理前后的UiO-66等离子体的XRD衍射特征峰基本吻合,且UiO-66等离子体处理后的表面积为等离子体处理前的80.2%,说明UiO-66在等离子体中具有良好的稳定性。在放电电压11.4~19.1 kV、放电时间0.5~3 h条件下UiO-66能保持良好的骨架结构。
Zr-based metal-organic frameworks(Zr-MOFs)are widely applied in gas storage and separation,drug delivery,chemical sensing and catalysis,due to their good stability in heat,acid and alkali solutions.They have been used in the process of plasma catalysis,recently.In this work,the stability of three typical Zr-based MOFs(UiO-66,UiO-67,UiO-66-NH 2)were studied in the atmospheric-pressure dielectric barrier discharge(DBD)plasma.The structure and specific surface area of the samples were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR)and N 2 sorption analysis(BET).The results show that UiO-66 exhibits the best stability among the three typical Zr-MOFs in the DBD plasma.The framework of UiO-67 is damaged after DBD plasma treatment,and UiO-66-NH 2 is destroyed seriously.The specific surface areas of UiO-67 and UiO-66-NH 2 after plasma treatment are only 19.0%and 3.1%of those before plasma treatment.These indicate that UiO-67 and UiO-66-NH 2 cannot exist stably in the DBD plasma when using CO 2 and H 2 mixture as working gas.For comparison,the XRD characteristic peaks of UiO-66 before and after plasma treatment are basically consistent,and the specific surface area after plasma treatment is 80.2%of that before plasma treatment.UiO-66 can maintain its framework structure under discharge voltage of 11.4-19.1 kV for 0.5-3h,suggesting that UiO-66 has good stability in plasma.
作者
徐卫卫
董梦悦
赵静
张鸣清
底兰波
张秀玲
XU Weiwei;DONG Mengyue;ZHAO Jing;ZHANG Mingqing;DI Lanbo;ZHANG Xiuling(College of Physical Science and Technology,Dalian University,Dalian 116622,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第16期16104-16108,共5页
Materials Reports
基金
国家自然科学基金(21673026
21773020)
大连大学研究生教育教学改革基金。
关键词
Zr基金属有机骨架材料
介质阻挡放电
等离子体
稳定性
Zr-based metal-organic frameworks(Zr-MOFs)
dielectric barrier discharge(DBD)
plasma
stability
