Solar-light-triggered regenerative adsorption removal of styrene by silver nanoparticles incorporated in metal–organic frameworks
- 27 December 2020
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Environmental Science: Nano
- Vol. 8 (2), 543-553
- https://doi.org/10.1039/d0en01011a
Abstract
Adsorption is an attractive technique for the removal of volatile organic compounds (VOCs) from polluted air; however, it is still challenging to efficiently release adsorbed VOCs. Herein, in consideration of the unprecedented VOC adsorption capability of MOFs and excellent photothermal effects of Ag nanoparticles, a novel photodynamic Ag/UiO-66 adsorbent was constructed by integrating Ag nanoparticles with UiO-66 using a colloidal deposition method. The obtained Ag/UiO-66 samples were found to possess the excellent porosity and high styrene adsorption capability of parent UiO-66. Upon exposure to simulated solar light, Ag nanoparticles could convert light energy into thermal energy, which gave rise to light-induced localized heat near Ag nanoparticles. Subsequently, this localized heat triggered the thermal desorption of the adsorbed styrene from Ag/UiO-66, thus successfully realizing efficient in situ regeneration of Ag/UiO-66 under solar light irradiation. Moreover, the desorption capacity can be effectively regulated by the Ag content. More importantly, the regenerability of Ag/UiO-66 remained intact even after five adsorption–desorption cycles; however, pure UiO-66 recovered only 51.6% of its adsorption capacity and maintained 77.0% of its desorption capacity after five cycles. Furthermore, adsorption kinetic parameters and a possible regeneration mechanism are described in detail.Keywords
Funding Information
- Natural Science Foundation of Guangdong Province (2019A1515010989)
- National Natural Science Foundation of China (22076028, 41731279, 41991314)
- Guangdong Provincial Pearl River Talents Program (2017BT01Z032)
- Pearl River S and T Nova Program of Guangzhou (201806010177)
- Guangdong Special Support Plan (2016TX03Z094, 2016TQ03Z291)
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