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Photooxidation of Guaiacol to Organic Acids with Hydrogen Peroxide by Microwave Discharge Electrodeless Lamps
Author(s) -
Zhang Dajie,
Sun Binzhe,
Duan Lian,
Tao Yufang,
Xu Aihua,
Li Xiaoxia
Publication year - 2016
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201500251
Subject(s) - guaiacol , chemistry , hydrogen peroxide , lignin , radical , photocatalysis , photochemistry , microwave , electron paramagnetic resonance , organic chemistry , nuclear chemistry , catalysis , physics , nuclear magnetic resonance , quantum mechanics
The production of chemicals from lignin by green and sustainable technologies is a promising alternative route to replace fossil fuels. Photooxidation of guaiacol, a model of lignin, to value‐added carboxylic acids with microwave discharge electrodeless lamps as light source was investigated in the presence of hydrogen peroxide (H 2 O 2 ). The coupled UV‐vis/microwave irradiation led to a more effective degradation of guaiacol than with conventional photocatalysis. Hydroxyl radicals as active species, confirmed by electron spin resonance spin‐trapping, were generated and participated in the oxidation. The effect of different operating conditions such as reaction time, guaiacol concentration, solution pH, as well as oxidant concentration, was evaluated.