Mitigation of hazardous toluene via ozone-catalyzed oxidation using MnOx/Sawdust biochar catalyst

Jin Sun Cha; Young-Min Kim; Im Hack Lee; Yong Jun Choi; Gwang Hoon Rhee; Hocheol Song; Byong-Hun Jeon; Su Shiung Lam; Moonis Ali Khan; Kun-Yi Andrew Lin; Wei-Hsin Chen; Young-Kwon Park

doi:10.1016/j.envpol.2022.119920

Mitigation of hazardous toluene via ozone-catalyzed oxidation using MnOx/Sawdust biochar catalyst

Environ Pollut. 2022 Nov 1:312:119920. doi: 10.1016/j.envpol.2022.119920. Epub 2022 Aug 14.

Authors

Affiliations

¹ Material Technology Center, Korea Testing Laboratory, Seoul, 08389, Republic of Korea.
² Department of Environmental Engineering, Daegu University, Gyeongsan, 38453, Republic of Korea.
³ School of Environmental Engineering, University of Seoul, Seoul, 02504, Republic of Korea.
⁴ Department of Mechanical and Information Engineering, University of Seoul, 02504, Seoul, Republic of Korea.
⁵ Department of Earth Resources and Environmental Engineering, Hanyang University, Seoul, 04763, Republic of Korea.
⁶ Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), Universiti Malaysia Terengganu, 21030, Kuala Nerus, Terengganu, Malaysia.
⁷ Chemistry Department, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia.
⁸ Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan.
⁹ Department of Aeronautics and Astronautics, National Cheng Kung Univ., Tainan, 701, Taiwan; Research Center for Smart Sustain. Circular Economy, Tunghai Univ., Taichung, 407, Taiwan; Department of Mechanical. Engineering, National Chin-Yi Univ. of Technol., Taichung, 411, Taiwan.
¹⁰ School of Environmental Engineering, University of Seoul, Seoul, 02504, Republic of Korea. Electronic address: catalica@uos.ac.kr.

PMID: 35977635
DOI: 10.1016/j.envpol.2022.119920

Abstract

This study investigated catalytic ozone oxidation using a sawdust char (SDW) catalyst to remove hazardous toluene emitted from the chemical industry. The catalyst properties were analyzed by proximate, ultimate, nitrogen adsorption-desorption isotherms, Fourier-transform infrared, and X-ray photoelectron spectroscopy analyses. In addition, hydrogen-temperature programmed reduction experiments were conducted to analyze the catalyst properties. The specific area and formation of micropores of SDC were improved by applying KOH treatment. MnOx/SDC-K3 exhibited a higher toluene removal efficiency of 89.7% after 100 min than MnOx supported on activated carbon (MnOx/AC) with a removal efficiency of 6.6%. The higher (O_ads (adsorbed oxygen)+O_v(vacancy oxygen))/O_L (lattice oxygen) and Mn³⁺/Mn⁴⁺ ratios of MnOx/SDC-K3 than those of MnOx/AC seemed to be important for the catalytic oxidation of toluene.

Keywords: Hazardous toluene; KOH activation; MnOx/biochar; Modified biochar; Ozone-catalyzed oxidation.