Kinetic Modeling for Microwave-Enhanced Degradation of Methylene Blue Using Manganese Oxide. (10th January 2013)

• Record Type: Journal Article
• Authors: Kuan, Wen-Hui; Chen, Chun-Yuan; Hu, Ching-Yao; Tzou, Yu-Min
• Other Names: Soltan Jafar Academic Editor.
• Is Part Of: International journal of photoenergy. Volume 2013(2013)
• Publication Date: 2013-01-10
• Subjects: Photochemistry -- Periodicals; Photobiology -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Photochimie; Photobiologie; Chimie physique et théorique; Chemistry, Physical and theoretical; Photobiology; Photochemistry; Electronic journals; Periodicals; 541.35
• DOI: 10.1155/2013/916849
• Languages: English
• ISSNs: 1110-662X

Abstract

Abstract : This study was originally performed to compare the MnO2 -based degradation of aqueous methylene blue (MB) under microwave irradiation- (MW-) enhanced and conventional heating- (CH-) enhanced conditions. The degradation process and kinetics were investigated to elucidate the microwave effect on the reaction. The results showed that all three tested conditions, sole MnO2, MnO2 /CH, and MnO2 /MW, followed the third-order (second upon MB and first upon MnO2 ) 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 benefit for the generation of electrophilic oxygen ions (O 2 −, O −, and O 2 − ) to degrade MB. The 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.