Coupling of sulfur and boron in carbonaceous material to strengthen persulfate activation for antibiotic degradation : Active sites, mechanism, and toxicity assessment

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Feng Ye
  • Wei Sun
  • Kangfeng Pang
  • Wenchao Yang
  • Mengjie Pu

Detail(s)

Original languageEnglish
Article number107755
Journal / PublicationChinese Chemical Letters
Volume34
Issue number5
Online published19 Aug 2022
Publication statusPublished - May 2023

Abstract

Carbon-mediated persulfate advanced oxidation processes (PS-AOPs) are appealing in contaminant remediation. For the first time, S,B-co-doped carbon-based persulfate activators were synthesized through direct carbonization of sodium lignosulfonate and boric acid. By degrading sulfamethoxazole (SMX), CSB-750 obtained 98.7% removal and 81.4% mineralization within 30 min. In comparison with solo S or B doping, S and B co-doped carbon showed the coupling effect for enhanced catalysis. The rate constant (kobs) of 0.1679 min–1 was 22.38- and 279.83-fold higher than those of CS-750 (0.0075 min–1) and CB-750 (0.0006 min–1), respectively. The degradation was efficient at strong acidic and weak basic conditions (pH 3–9). Substantial inhibition effect was presented at strong basic condition (pH 10.95) and in presence of CO32–. The CO32–-caused inhibition was the combined result of the cooperation of pH and quenching O2·–. Thiophene sulfur, BC3, BC2O, and structural defects were identified as the active sites for PS activation. Radical and nonradical pathways were both involved in the CSB-750/PS/SMX system, where 1O2 dominated the degradation, SO4·–, ·OH and direct electron transfer played the subordinate role, and O2·– served as a precursor for the formation of partial 1O2. The toxicity of degradation system, the effect of real water matrix, and the reusability of carbocatalysts were comprehensively analyzed. Nine possible degradation pathways were proposed. This work focuses on the catalytic performance improvement through the coupling effect of S,B co-doping, and develops an advanced heteroatom doping system to fabricate carbonaceous persulfate activators. © 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of MateriaMedica, Chinese Academy of Medical Sciences.

Research Area(s)

  • Advanced oxidation process, Coupling effect, Nonradical pathway, S,B-co-doped carbons

Citation Format(s)

Coupling of sulfur and boron in carbonaceous material to strengthen persulfate activation for antibiotic degradation: Active sites, mechanism, and toxicity assessment. / Ye, Feng; Sun, Wei; Pang, Kangfeng et al.
In: Chinese Chemical Letters, Vol. 34, No. 5, 107755, 05.2023.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review