Peroxymonosulfate Activation by Rice-Husk-Derived Biochar (RBC) for the Degradation of Sulfamethoxazole: The Key Role of Hydroxyl Groups.

Publisher: MDPI Country of Publication: Switzerland NLM ID: 101092791 Publication Model: Electronic Cited Medium: Internet ISSN: 1422-0067 (Electronic) Linking ISSN: 14220067 NLM ISO Abbreviation: Int J Mol Sci Subsets: MEDLINE

Original Publication: Basel, Switzerland : MDPI, [2000-

Sulfamethoxazole*/chemistry ; Charcoal*/chemistry ; Oryza*/chemistry ; Peroxides*/chemistry; Kinetics ; Catalysis ; Hydroxyl Radical/chemistry

In this work, rice-husk-derived biochar (RBC) was synthesized by using simple one-step pyrolysis strategies and served as catalysts to activate peroxymonosulfate (PMS) for degrading sulfamethoxazole (SMX). When the annealing temperature (T) = 800 °C, RBC 800 exhibits the typical hardwood structure with several micropores and mesoporous. Furthermore, RBC 800 obtains more defect sites than RBC 600 , RBC 700 , and RBC 900 . In the RBC 800 /PMS system, the removal rate of the SMX reached 92.0% under optimal conditions. The kinetic reaction rate constant ( kobs ) of the RBC 800 /PMS system was 0.009 min ^-1 , which was about 1.50, 1.28, and 4.50 times that of the RBC 600 /PMS ( kobs = 0.006 min ^-1 ), RBC 700 /PMS ( kobs = 0.007 min ^-1 ), and RBC 900 /PMS ( kobs = 0.002 min ^-1 ) systems, respectively. In the RBC 800 /PMS system, sulfate radical (SO 4^•- ) is the main active species. Compared with other active sites, the hydroxyl group (C-OH) on the surface of RBC 800 interacts more strongly with PMS, which is more likely to promote the stretching of the O-O bond of the PMS, thus breaking into the activated state and significantly reducing the activation energy required for reaction. The degradation intermediates of SMX were speculated, and the toxicity analysis was conducted. Generally, this work reveals in depth the interaction between reactive sites of biochar-based catalysts and PMS at the molecular level.

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2019YFC0408500 National Key R&D Program of China; 201903a07020009 Major Science and Technology Projects of Anhui Province; 202003a07020004 Major Science and Technology Projects of Anhui Province; J2020K07 Hefei independent innovation policy loan transfer subsidy project; 52300016 the National Natural Science Foundation of China; No. 2023M733379 China Postdoctoral Science Foundation

Keywords: biochar; hydroxyl group; peroxymonosulfate; sulfamethoxazole

JE42381TNV (Sulfamethoxazole)
16291-96-6 (Charcoal)
0 (biochar)
22047-43-4 (peroxymonosulfate)
0 (Peroxides)
3352-57-6 (Hydroxyl Radical)

Date Created: 20241109 Date Completed: 20241109 Latest Revision: 20241116

20250114

PMC11545899

10.3390/ijms252111582

39519134