N, S-Doped porous carbons for persulfate activation to remove tetracycline: Nonradical mechanism.

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ID: 94009
2020
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Abstract
Nitrogen and sulfur-codoped porous carbons (SNCs) with porous structures and high surface areas were successfully synthesized employing coffee grounds, sodium bicarbonate and L-cysteine monohydrochloride as precursors. The SNCs were highly efficient for adsorption and exhibited outstanding catalytic performance for the oxidative degradation of tetracycline hydrochloride (TeC) solutions, especially at a calcined temperature of 700 °C (SNCs-700). The radical quenching, advanced in situ electron paramagnetic resonance (EPR) technology, PS decomposition rates and Linear Sweep Voltammetry (LSV) indicated that the excellent oxidative effectiveness of the PS/SNCs-700 system originated from the nonradical pathways (singlet oxygen (O) and electron transfer). It's supposed that N and S doping can effectively create point defects, which could generate O, while carbonyl groups were determined to be the main active sites contributing to the electron transfer. TeC degradation intermediates were also identified, three degradation pathways, revealing that the pre-adsorption significantly accelerated the nonradical oxidation pathways. This approach provides an innovative method for the large-scale production and application of high-quality catalysts in water treatment.
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huo2020njournal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Huo, Xiaowei;Zhou, Peng;Zhang, Jing;Liu, Yunxin;Cheng, Xin;Liu, Yang;Li, Wenshu;Zhang, Yongli;
Journal Journal of hazardous materials
Year 2020
DOI
S0304-3894(20)30041-8
URL
Keywords
persulfate electron transfer singlet oxygen nitrogen and sulfur codoping porous carbons

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