Peparation Of ?-FeOOH And Catalytic Performance In Degradation Of Reactive Yellow X-R Dye

At present,the harmful non-ferrous waste water produced by the industry,especially the textile industry,is one of the main causes of environmental pollution of water resources.The entry of synthetic dye wastewater into the water environment can cause serious problems because of their high chroma,high organic content,low biodegradability,and great environmental impact.Therefore,it is very important to remove these contaminants from contaminated water.Fenton advanced oxidation technology is an important method for the treatment of dye wastewater.The homogeneous Fenton reaction requires high pH and must be used under acidic conditions.The catalyst can not be reused,it is difficult to separate from the reaction medium,and the water body is yellow and produces a large amount.Iron mud,difficult to recycle,easy to cause secondary pollution to the environment.Therefore,it is particularly important to find a catalyst that has a wide pH range,is easy to recycle,and can be reused.In this paper,an iron hydroxide ?-FeOOH catalyst was prepared by precipitation method,which was used as a heterogeneous Fenton reaction catalyst for Fenton reaction.The preparation conditions of the catalyst were screened and characterized.XR dye wastewater was used as the target wastewater,and the factors affecting the decolorization of reactive yellow X-R dye wastewater during the heterogeneous Fenton reaction were studied.This experiment investigated the effect of the addition of disodium hydrogen phosphate ratio,calcination time and calcination temperature on the activity of the catalyst.Adding 1%disodium hydrogen phosphate,the calcination temperature is 110?,the calcination time is 3h,the activity of the catalyst is the highest,and the decolorization rate of the dye wastewater is the highest.The catalyst was characterized by XRD,SEM,BET,thermogravimetry and the like.The reactive yellow X-R dye wastewater was used as simulated wastewater.The effects of light,dye wastewater concentration,H2O2 concentration,catalyst dosage and pH on the reaction were studied to determine the optimal conditions for the reaction.The experimental results show that for 250ml,100mg/L active yellow X-R dye wastewater,under the condition of ultraviolet light,the catalyst dosage is 0.15g/L,and the H2O2 concentration is 5.88mmol,the degradation rate of dye wastewater is the highest.The pure ultraviolet light has a weak degradation ability to the active yellow X-R dye,but under the action of ultraviolet light,the H2O2 and pH=3 can be improved,the decolorization effect is best,the degradation rate can reach 97.3%,and with the increase of pH,At pH=7,there is still a 65%degradation rate.And when the catalyst is reused four times,the degradation rate of the dye wastewater can still reach more than 85%,and has good catalytic activity and stability.It can be seen that the UV/?-FeOOH/H2O2 heterogeneous Fenton reaction system formed by the self-made catalyst and ultraviolet light has a significant effect on the decolorization rate of the dye,and has a good application prospect.In order to simulate the more realistic actual dye wastewater,the introduction of the electrodeless anion in the simulated wastewater,studied the addition amount of NO3-,SO42-,Cl-on the active yellow X-R dye wastewater The effect of degradation rate shows that when the presence of SO42-in the solution has little effect on the decolorization rate,the presence of Cl-and NO3 will produce the decolorization rate.The photo-assisted heterogeneous Fenton reaction is a dye wastewater treatment technology worthy of promotion.It avoids secondary pollution,has a wide pH range,and has high utilization rate of H2O2.The catalyst can be reused many times,greatly reducing the cost of subsequent treatment wastewater.It is a highly suitable dye wastewater treatment method with very good application prospects.