Journal
WATER RESEARCH
Volume 198, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2021.117149
Keywords
MgNCN/MgO nanocomposite; one-step synthesis; H2O2 activation; singlet oxygen; tetracycline degradation
Funding
- National Science Foundation for Distinguished Young Scholars of China [51725504]
- CAS/SAFEA International Partnership Program for Creative Research Teams of Chinese Academy of Sciences [2015HSCUE004]
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The MgNCN/MgO nanocomposites synthesized in this study exhibited excellent antibiotic degradation capability within a wide pH range without the need for external energy input. The activation of H2O2 by Mg-N coordination in the nanocomposites produced singlet oxygen and hydroxyl radicals, leading to the degradation of antibiotics. This work provides a novel approach for designing transition-metal-free catalysts for nonradical activation of H2O2.
Currently existing Fenton-like catalysts were limited in wastewater treatment owing to their potential transition-metal poisoning, narrow applicable pH range and high dependence on external energy excitation. In this work, the MgNCN/MgO nanocomposites were firstly synthesized by a facile one-pot calcination of melamine and basic magnesium carbonate, and used as novel H2O2 activator for antibiotic removal. It was found that the MgNCN/MgO composite calcined at 550 degrees C with the mass ratio of melamine to basic magnesium carbonate at 2:1, exhibited an excellent catalytic ability to tetracycline (TC) degradation in a wide pH range of 4-10 without any external energy input. More than 90% of TC (100 mL, 50 mg/L) could be degraded within 30 min by 10 mg of the nanocomposite in the presence of 0.2 mL of 30 wt% H2O2. Based on the experimental results, it was concluded that the Mg-N coordination between MgNCN and MgO in MgNCN/MgO nanocomposites activated H2O2 to produce primary singlet oxygen (O-1(2)) and minor hydroxyl radicals ((OH)-O-center dot), responding for TC degradation. In addition, the degradation pathways of TC were deduced by determining the generated intermediates during the degradation process. This work provided a novel idea for designing transition-metal-free catalysts for nonradical activation of H2O2 in the absence of external energy excitation. (C) 2021 Elsevier Ltd. All rights reserved.
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