高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (4): 20210867.doi: 10.7503/cjcu20210867

• 物理化学 • 上一篇    下一篇

超薄Sm-MOF纳米片的合成及可见光催化降解芥子气模拟剂性能

冯丽1, 邵兰兴1, 李思骏1, 全文选2, 庄金亮1,2()   

  1. 1.贵州师范大学化学与材料科学学院, 贵州省功能材料化学重点实验室
    2.贵州省山地环境保护重点实验室, 贵阳 550001
  • 收稿日期:2021-12-28 出版日期:2022-04-10 发布日期:2022-02-28
  • 通讯作者: 庄金亮 E-mail:jizhuang@xmu.edu.cn
  • 基金资助:
    国家自然科学基金(21861013);贵州省科学技术基金(批准号: 黔科合基础ZK[2022]重点034)和贵州特色林业产业研究重点实验室项目(批准号: 黔教合KY字[2021]002)资助

Synthesis of Ultrathin Sm-MOF Nanosheets and Their Visible-light Induced Photodegradation of Mustard Simulant

FENG Li1, SHAO Lanxing1, LI Sijun1, QUAN Wenxuan2, ZHUANG Jinliang1,2()   

  1. 1.Key Laboratory of Functional Materials and Chemistry of Guizhou Province,School of Chemistry and Materials Science
    2.Key Laboratory of Mountainous Environmental Protection of Guizhou,Guizhou Normal University,Guiyang 550001,China
  • Received:2021-12-28 Online:2022-04-10 Published:2022-02-28
  • Contact: ZHUANG Jinliang E-mail:jizhuang@xmu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21861013);the Guizhou Provincial Science and Technology Foundation, China(ZK[2022]corefund034);the Guizhou Characteristic Forestry Industry Research Key Laboratory Project, China(KY[2021]002)

摘要:

超薄金属-有机框架材料(MOFs)纳米片具有高密度、 易暴露的表面活性位点、 较短的底物/产物扩散路径等特点, 是性能优异的异相催化剂. 本文以光活性有机配体(H4TBAPy)和镧系金属离子Sm3+构筑光活性超薄MOFs纳米片, 以苯甲酸作为调节剂, 利用微波法快速合成了Sm-TBAPy二维纳米片. 利用扫描电子显微镜(SEM)、 透射电子显微镜(TEM)、 X射线衍射(XRD)、 紫外-可见漫反射光谱(UV-Vis DRS)、 傅里叶变换红外光谱(FTIR)和氮气吸附-脱附等手段表征了Sm-TBAPy二维纳米片的形貌、 结构和组成. 所合成的Sm-TBAPy为单分散二维纳米片, 宽度约为200 nm, 厚度约为12 nm, BET比表面为163 m2/g, 禁带宽度为2.62 eV. Sm-TBAPy二维纳米片在室温、 氧气氛围和可见光照射条件下, 可将芥子气模拟剂[2-氯乙基乙基硫醚(CEES)]高效、 高选择性氧化成亚砜产物CEESO, 且催化剂经过4次循环使用仍保持较高的催化性能. 结合电子顺磁共振波谱, 提出了Sm-TBAPy二维纳米片可见光催化氧化CEES的催化机理.

关键词: 超薄金属-有机框架材料纳米片, 芥子气, 可见光催化, 2-氯乙基乙基硫醚, 微波合成

Abstract:

Ultrathin metal-organic frameworks(MOFs) nanosheets are excellent heterogeneous catalysts owing to their unique structural properties, such as high density and exposed surface active sites, short diffusion distance for reactants/products. Herein, by the employment of photoactive 1,3,6,8-tetrakis(p-benzoic acid)pyrene(H4TBAPy) as ligand and lanthanide metal ion Sm3+ as metal node, and benzoic acid as modulator, ultrathin two-dmensional Sm-TBAPy nanosheets were synthesized by microwave method. The morphological and structural information of Sm-TBAPy nanosheets were characterized by SEM, TEM, XRD, UV-Vis DRS, FTIR and N2 adsorption-desorption techniques. The as-synthesized Sm-TBAPy are monodispersed nanosheets with size of 200 nm and thickness of 12 nm. The BET specific surface area is 163 m2/g, and the bandgap is 2.62 eV. Sm-TBAPy nanosheets enable selective photocatalytic conversion of 2-chloroethyl ethyl sulfide(CEES) into CEESO under blue light irradiation at room temperature in the presence of oxygen. The catalysts can be reused for 4 times without significantly decrease in catalytic activity. Moreover, combined with electron paramagnetic resonance spectroscopy, a plausible photocatalytic mechanism was proposed. Benefiting from the similarity of lanthanide series, our strategy is expected to apply for the synthesis of lanthanide-based MOF nanosheets as highly efficient catalysts.

Key words: Ultrathin MOFs nanosheets, Mustard gas, Visible-light photocatalysis, 2-Chloroethyl ethyl sulfide, Microwave synthesis

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