Abstract
Abstract The promoting effect of gallic acid (GA) on the discoloration of methyl orange (MO) in H 2 O 2 /Fe(III) Fenton process was investigated in this study. The MO discoloration rate in H 2 O 2 /Fe(III) system with GA was significantly higher than that with sulfuric acid. Central composite design based on the response surface methodology (RSM) was adopted to evaluate the effects of initial Fe(III) concentration, initial pH and molar ratios of H 2 O 2 /Fe(III) and GA/Fe(III) on the discoloration rate constant k app . The RSM model was derived and optimal molar ratios of H 2 O 2 /Fe(III) = 100:1 and GA/Fe(III) = 2:1 were obtained. The H 2 O 2 /Fe(III)/GA system also showed good adaptability with minor decreasing trend in alkaline circumstance. Reaction mechanisms for the promoted formation of hydroxyl radical (HO ) by GA were proposed. GA could not only form complexes with Fe(III) to Fe(II) and prevent the precipitation of Fe(III) subsequently, but also accelerate the reduction of Fe(III) to enhance the formation of HO . Moreover, the readily oxidizable characteristic of GA makes it a good option with environmental benignity in Fenton system.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
