Strategies comparison of eliminating the passivation of non-aromatic intermediates in degradation of Orange II by Fe3+/H2O2.
The degradation kinetics of Orange II by Fe(3+)/H(2)O(2) was examined under various conditions in the presence of the non-aromatic organic intermediates such as malonic acid (MA), oxalic acid (OX) and EDTA. Various strategies were adopted to eliminate the passivation of the non-aromatic organic intermediates in the Fenton-like degradation of Orange II. UV irradiation, visible irradiation, hydroquinone (HQ) additive and their hybrid were used to accelerate the decoloration of Orange II; however, some of them were failed to show a good performance in the presence of non-aromatic organics, especially for the mineralization of Orange II. Aluminum ions additive released the ferric ions via a competitive chelation process, and accelerated the reaction obviously. From the decoloration and the mineralization data of Orange II, UV irradiation combined with Al(3+) ion additive was regarded as the most favorable strategy for deep mineralization of Orange II by Fe(3+)/H(2)O(2) in the presence of non-aromatic intermediates. However, by considering the decoloration of Orange II with moderate mineralization, the combination of visible irradiation and Al(3+) ion additive might present the best performance.
Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, China. fengchen@ecust.edu.cn
Feng
F
Chen
Yan
Y
Li
Liqin
L
Guo
Jinlong
J
Zhang
D000535:Aluminum; D001391:Azo Compounds / Q000737:chemistry* / Q000528:radiation effects; D001557:Benzenesulfonates / Q000737:chemistry* / Q000528:radiation effects; D002614:Chelating Agents / Q000737:chemistry; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D014466:Ultraviolet Rays
D001391:Azo Compounds; D001557:Benzenesulfonates; D002614:Chelating Agents; D006861:Hydrogen Peroxide; D000535:Aluminum; D007501:Iron; C014722:2-naphthol orange