is study was originally performed to compare the MnO 2-based degradation of aqueous methylene blue (MB) under microwave irradiation-(MW-) enhanced and conventional heating-(CH-) enhanced conditions. e degradation process and kinetics were investigated to elucidate the microwave effect on the reaction. e results showed that all three tested conditions, sole MnO 2 , MnO 2 /CH, and MnO 2 /MW, followed the third-order (second upon MB and �rst upon MnO 2) kinetic model. However, a higher degradation rate of MB was available under the MW-enhanced process, which implies that the "athermal effect" of MW might be of more bene�t for the generation of electrophilic oxygen ions (O 2 − , O − , and O 2−) to degrade MB. e results showed that the degradation percentage of MB could reach 100%, corresponding to 92% total organic carbon (TOC) removal under microwave irradiation at pH 7.20 for 10 min.
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