Preparation Of Fe Based Solid Acid Catalyst For Photo-Fenton Degaration Of X-3B Dyeing Wastewater

Modern textile technology has brought us many benefits, but also brought a lot of damage to the environment because of the printing and dyeing wastewater, and therefore how to deal with the printing and dyeing wastewater become the focus of current research. In this study, a new type of heterogeneous Fenton-like catalysts was synthesized for the treatment of printing and dyeing wastewater. We intended to prepare Fe-Zn-O heterogeneous catalyst by citric acid sol-gel method, and then which was acidified by H2SO4solution. After finishing preparation, these chalybeate compounds were characterized by SEM for the morphology of the samples, BET surface area for the porous structure, FTIR for the surface groups and XRD for the dispersibility of metal oxides. In order to examine the activities of different catalyst, a series of photo-Fenton reactions have been conducted to decontaminate the simulated dyeing (Reactive red X-3B) wastewater. The initial pH, the concentration of H2O2, the dosage of catalyst were taken consideration, in which the decolorization rate and degree of mineralization (TOC removal rate), finally, the stability of catalyst was also discussed in details by determining the leaching amount of Fe ions.The results show that acidic Fe-Zn-O heterogeneous catalysts have been successfully prepared. The characterization results show that prepared catalysts were porous-material, and Fe ions have been immobilized in the catalysts, and the introduction of S=O led to the generation of L acidic sites and B acidic sites. The Fe-Zn-O solid acid catalyst was used to assist the heterogeneous Fenton reaction in the irradiation of visible light for the degradation of organic dyes. It was found that the catalyst had high catalytic activity, in which acid sites played an important role in photo-Fenton reactions. The decolourization and TOC removal of a solution containing1.5L100mg/L X-3B dyes, using1.0g/L catalyst, initial pH=6.0, T=298K, initial H2O2=9.8mM were measured. The decolourization and TOC removal rate of the reaction were92.5%and46.7%, respectively. Stability test indicated that catalysts were predominant and iron leaching in these systems kept at about0.3mg/L indicating prepared catalysts may have long-term stability and industrial application potential.