Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 607, Issue -, Pages 857-868Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.08.168
Keywords
Halloysite nanotubes; Peroxymonosulfate activation; Degradation of sulfamethoxazole; Low metal leaching rate
Categories
Funding
- Shijiazhuang Municipal Bureau of science and technology [191240263A, 211240043A]
- National Science Foundation of Hebei province [B2020208064]
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A new hollow nanotube material, 30% Co-CHNTs, was prepared as a catalyst for the degradation of sulfamethoxazole (SMX) using peroxymonosulfate (PMS) activation. The material exhibited high SMX degradation rates and stability in natural organic matter solutions, making it a potential candidate for antibiotic wastewater treatment.
In this study, a new hollow nanotube material, 30% Co-CHNTs was prepared by the impregnation-chemical reduction-calcination method. This material can be used as a peroxymonosulfate (PMS) activator to catalyse the degradation of sulfamethoxazole (SMX). The best reaction conditions that correspond to the degradation rate of SMX, up to 97.5%, are as follows: the concentration of SMX is 10 mg L-1, the amount of catalyst is 0.20 g L-1, the dosage is 1.625 mM, and the solution pH is 6.00. X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma optical emission spectrometry (ICP-OES) show that the calcined composites mainly stimulate an increase in the content of bivalent cobalt in PMS and reduce the leaching of cobalt ions after the reaction. Additionally, the 30% Co-CHNTs + PMS reaction system exhibits a reasonable SMX degradation rate in a natural organic matter solution and excellent stability after three repeated experiments. Furthermore, the possible degradation mechanism in the 30% Co-CH NTs + PMS reaction system was analysed through electron paramagnetic resonance (EPR) and free-radical capture experiments, and it was observed that the non-radical degradation of O-1(2) plays a leading role in SMX degradation. Finally, according to the nine degradation intermediates detected by liquid chromatography-mass spectrometry (LC-MS), four possible SMX degradation routes were proposed. This study proved that a 30% Co-CHNTs heterogeneous catalyst is easily prepared, inexpensive, and environmentally friendly and has potential application in antibiotic wastewater treatment. (C) 2021 Elsevier Inc. All rights reserved.
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