Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 13, Pages 11662-11671Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b01686
Keywords
Microwave; Specific microwave effect; Persulfate; p-Nitrophenol
Categories
Funding
- National Natural Science Foundation of China [51678185, 51779066]
- Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [QA201924]
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Microwave (MW) irradiation is a promising alternative method for the treatment of sewage. In the present work, persulfate (PS) was effectively activated under microwave heating for p-nitrophenol (PNP) degradation in water. As a result, at a microwave power of 300 W, PS was successfully activated by microwave, resulting in a superior PNP degradation efficiency (96.8%) within 14 min. The specific microwave effect was explored from the perspectives of the PS utilization efficiency and the reaction activation energy in the PS+MVV system, using a conventional heating system as the control. In addition, the effects of the initial pH, coexisting inorganic ions, and natural organic matter were evaluated, and the results showed that these three factors had negligible effects on PNP removal in the PS+MW system. Based on the results of the quenching experiment and electron paramagnetic resonance (EPR) detection, the major active radical was identified as SO4 center dot-, while center dot OH played a small role during the oxidation process. The practical application of this system was examined, and it performed well in two water matrices: secondary treated wastewater (WW) and the Songhua River.
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