Templating agent-mediated Cobalt oxide encapsulated in Mesoporous silica as an efficient oxone activator for elimination of toxic anionic azo dye in water: Mechanistic and DFT-assisted investigations.

Autor: Khiem TC; Department of Environmental Engineering & Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan., Mao PH; Department of Environmental Engineering & Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan., Park YK; School of Environmental Engineering, University of Seoul, Seoul, 02504, Republic of Korea., Duan X; School of Chemical Engineering and Advanced Materials, The University of Adelaide, SA, 5005, Australia., Thanh BX; Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology, Ho Chi Minh City, 700000, Viet Nam., Hu C; Department of Chemical Engineering, National Taiwan University of Science and Technology, Da'an Dist., Taipei City, Taiwan, 106. Electronic address: chechia@mail.ntust.edu.tw., Ghotekar S; Department of Chemistry, Smt. Devkiba Mohansinhji Chauhan College of Commerce & Science (University of Mumbai), Silvassa, 396 230, Dadra and Nagar Haveli (UT), India., Tsang YF; Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, New Territories, 999077, Hong Kong., Andrew Lin KY; Department of Environmental Engineering & Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan. Electronic address: linky@nchu.edu.tw.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2023 Feb; Vol. 313, pp. 137309. Date of Electronic Publication: 2022 Nov 26.
DOI: 10.1016/j.chemosphere.2022.137309
Abstrakt: While Azorubin S (AZRS) is extensively used as a reddish anionic azo dye for textiles and an alimentary colorant in food, AZRS is mutagenic/carcinogenic, and it shall be removed from dye-containing wastewaters. In view of advantages of SO 4 •- -related chemical oxidation technology, oxone (KHSO 5 ) would an ideal source of SO 4 •- for degrading AZRS, and heterogeneous Co 3 O 4 -based catalysts is required and shall be developed for activating oxone. Herein, a facile protocol is proposed for fabricating mesoporous silica (MS)-confined Co 3 O 4 by a templating agent-mediated dry-grinding procedure. As the templating agent retained inside the ordered pores of MS (before calcination) would facilitate insertion and dispersion of Co ions into pores, the resulting Co 3 O 4 nanoparticles (NPs) would be grown and confined within the pores of MS after calcination, affording Co@MS. On the contrary, another analogue, Co/MS, is also prepared using the similar protocol without the templating agent-mediated introduction of Co, but Co 3 O 4 NPs seriously aggregate as clusters on MS. Therefore, Co@MS outperforms Co/MS for activating oxone to eliminate AZRS. Co@MS shows a noticeably lower activation energy of AZRS elimination than the existing catalysts, revealing its advantage over the reported catalysts. Moreover, the mechanistic investigation of AZRS elimination by Co@MS-activated oxone has been also elucidated for identifying the presence of SO 4 •‒ , • OH, and 1 O 2 in AZRS degradation using scavengers, electron paramagnetic resonance spectroscopy, and semi-quantification. The AZRS decomposition pathway is also investigated and unveiled in details via the DFT calculation. These results validate that Co@MS appears as a superior catalyst of oxone activation for AZRS degradation.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022. Published by Elsevier Ltd.)
Databáze: MEDLINE
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