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J Colloid Interface Sci

Title:		Application of a manganese dioxide/amine-functionalized metal-organic framework nanocomposite as a bifunctional adsorbent-catalyst for the room-temperature removal of gaseous aromatic hydrocarbons
Author(s):		Wang J; Vikrant K; Kim KH;
Address:		"Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea. Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea. Electronic address: kkim61@hanyang.ac.kr"
Journal Title:		J Colloid Interface Sci
Year:		2023
Volume:		20230918
Issue:		Pt A
Page Number:		643 - 653
DOI:		10.1016/j.jcis.2023.09.108
ISSN/ISBN:		1095-7103 (Electronic) 0021-9797 (Linking)
Abstract:		"A high surface area (883 m(2).g(-1)) nanocomposite composed of an amine-functionalized metal-organic framework (NH(2)-UiO-66 (U6N)) and manganese dioxide (MnO(2)@U6N) was prepared as bifunctional adsorbent-catalyst for the purification of multiple aromatic volatile organic compounds (VOCs) such as benzene (B), toluene (T), m-xylene (X), and styrene (S), i.e., BTXS. The performance of MnO(2)@U6N was assessed for BTXS removal both as single- and multi-component systems at room temperature (RT (20 degrees C)) under dark conditions. MnO(2)@U6N exhibited superior catalytic-adsorption activity for the RT removal of BTXS. The removal performance of MnO(2)@U6N against BTXS was then assessed across varying levels of flow rate, VOC concentration, adsorbent/catalyst mass, and relative humidity. To better understand the catalytic-adsorption activity, two types of non-linear kinetic models (pseudo-first-order and pseudo-second-order) were utilized to simulate the experimentally obtained data. In-situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) analysis was also conducted to interpret the removal mechanism of BTXS. Their adsorption capacity (mg.g(-1)) values are estimated to increase in the order of B (21.1) < T (66.0) < X (79.1) < S (129.7). It is suggested that the adsorbed aromatic VOC molecules on the surface of MnO(2)@U6N should react with active oxygen species (lattice and adsorbed oxygen) to yield the environmentally benigh end products (i.e., carbon dioxide and water) along with various intermediates (e.g., alkoxides, aldehydes, phenolates, carboxylates, and anhydrides). Accordingly, the VOC removal potential of MnO(2)@U6N has been validated through the synergistic combination between adsorption (primary process) and catalysis (subordinate process) at RT"
Keywords:		Adsorption Catalysis Metal-organic frameworks Pollution purification Volatile organic compounds;
Notes:		"PublisherWang, Jiapeng Vikrant, Kumar Kim, Ki-Hyun eng 2023/09/24 J Colloid Interface Sci. 2023 Sep 18; 653(Pt A):643-653. doi: 10.1016/j.jcis.2023.09.108"