Discoloration Of Reactive Brilliant Red X-3B By Heterogeneous Photo-Fenton Reaction

With the development of domestic dye and dye printing industry, environment is polluted seriously by the dyeing wastewater let each year. The dyeing wastewater has been a serious global problem. If dyeing wastewater, especially azo dye wastewater is let, it will seriously do harm to local aquatic environment. The object of the paper is to study the one of problems of the dyeing treatment, the discoloration of dyeing wastewater, and the results are as following.1. UV/Fe carrier /H202 system is effective for Reactive Brilliant Red X-3B color removal, Experimental results show that the heterogeneous photo-Fenton reaction was in conformity with first-order kinetics equation within 10 minutes and rate constant equaled to 0.1225 min" . The discoloration of the dyes relates to pH and H2O2 concentration. The optimal discoloration for 100 mg/L RBR X-3B was obtained under the condition that pH and H202 concentration are 3.0 and 85mg/L respectively. In this study, discoloration of RBR X-3B was studied by using the iron oxides doped with cerium (Ce-Fe) as a heterogeneous catalyst in the presence of H2O2 and UV light (253.7nm). Compared with UV/Fe carrier /H202 system, UV/Ce-Fe /H2O2 system is more effective for RBR X-3B color removal. Experimental results show that the heterogeneous photo-Fenton reaction was in conformity with first-order kinetics equation within 10 minutes and rate constant equaled to 0.1225 min-1. The discoloration of the dyes relates to the doping dose of cerium for Ce-Fe preparation, pH and H202 concentration. The optimal discoloration for 100 mg/1 RBR X-3B was obtained under the condition that the doping dose of cerium, pH and H2O2 concentration are 0.08mol/L, 3.0 and 34mg/L respectively.2. XRD experimental results show that the doping of Cerium change the crystal assembling and it turn out to be a kind of minicrystal which is an intergradation from crystal to unformed structure, and this structure makes the material more active catalyzeperformance. Fe dissolved can improve the discoloration rate of RBR X-3B in UV/Ce-Fe /H2O2 system. Adsorption is the discoloration mechanism for RBR X-3B of Ce-Fe, Ce-Fe/HO system and UV/Ce-Fe system. UV/HO system and UV/Ce-Fe/H0 system have the degradation effect on RBR X-3B, and the latter is more prominent.In this paper, Ce-Fe was studied as a heterogeneous catalyst for the first time and it was used to treat the dyeing wastewater in UV/Ce-Fe /HOsystem. The above results not only provided a possible strategy for the color removal of dyeing wastewater, but also elucidated the reaction mechanisms to some extend.