Abstract
In the study, magnesium oxide (MgO) was used to catalyze peroxymonosulfate (PMS) for the degradation of organic pollutants for the first time. According to the single-factor experiment results, it was determined that MgO could efficiently catalyze PMS to degrade organic matters in a wide range of pH values. Based on radical quenching experiments and electron spinning resonance spectra, singlet oxygen was identified to be the crucial reactive species. Importantly, the oxygen vacancy on the surface of MgO was determined as the key active site, which accelerated the decomposition of PMS to produce singlet oxygen. This study provides an interesting insight into the novel and ignored catalyst of MgO for the highly efficient activation of PMS, which will greatly benefit the Fenton-like catalytic degradation of organic wastewater.
Highlights
Effluents from textile industries have caused extensive public concern, since a variety of organic compounds and toxic substances are difficult to decolorize due to their complex structure and synthetic origin, which flow into the river and threaten people’s health [1,2,3]
The efficiency of magnesium oxide (MgO) catalysis for PMS was determined by using Methylene Blue (MB) as a efficiency of MgOincatalysis was using Methylene as a targetThe pollutant
Free radical scavengers and electron-spin-resonance studies have confirmed that singlet oxygen is the key active oxygen species in the PMS/MgO system
Summary
Effluents from textile industries have caused extensive public concern, since a variety of organic compounds and toxic substances are difficult to decolorize due to their complex structure and synthetic origin, which flow into the river and threaten people’s health [1,2,3]. Through extensive research on the removal of various organic pollutants, many treatment methods have been developed, such as physical methods (adsorption, coagulation, and membrane separation), chemical methods (ozone oxidation, electrochemical and wet oxidation, and advanced catalytic oxidation), and biological methods (aerobic biological treatment, anaerobic biological treatment, and anaerobic–aerobic combined biological treatment) [5,6,7]. Among these methods, advanced oxidation process (AOP) is considered to be the most promising method because of its high removal efficiency and wide range of applications [8]. In 2003, peroxymonosulfate (PMS), instead of hydrogen peroxide, was used as a strong oxidant, and Co2+ was used a catalyst
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