期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 35, 页码 23404-23411出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b07853
关键词
selective adsorption; efficient regeneration; molecular gates; smart adsorbents; photoresponsive property
资金
- Distinguished Youth Foundation of the Jiangsu Province [BK20130045]
- National Natural Science Foundation of China [21576137]
- Fok Ying-Tong Education Foundation [141069]
- Project of Priority Academic Program Development of Jiangsu Higher Education Institutions
Selective adsorption and efficient regeneration are two crucial issues for adsorption processes; unfortunately, only one of them instead of both is favored by traditional adsorbents with fixed pore orifices. Herein, we fabricated a new generation of smart adsorbents through grafting photoresponsive molecules, namely, 4-(3-triethoxysilylpropyl-ureido)-azobenzene (AB-TPI), onto pore orifices of the support mesoporous silica. The azobenzene (AB) derivatives serve as the molecular gates of mesopores and are reversibly opened and closed upon light irradiation. Irradiation with visible light (450 nm) causes AB molecules to isomerize from cis to trans configuration, and the molecular gates are closed. It is easy for smaller adsorbates to enter while difficult for the larger ones, and the selective adsorption is consequently facilitated. Upon irradiation with UV light (365 nm), the AB molecules are transformed from trans to cis isomers, promoting the desorption of adsorbates due to the opened molecular gates. The present smart adsorbents can consequently benefit not only selective adsorption but also efficient desorption, which are exceedingly desirable for adsorptive separation but impossible for traditional adsorbents with fixed pore orifices.
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