Research On The Preparation Of Fe/co Bimetallic Loaded Catalysts And Its Application To Degradate H-acid Analog Wastewater

Since the 20th century,with the rapid development of dyes industry,China has become the first major country,and the economy has a fast increase,which comes with the environmental problems that need to be addressed.Among them,dye intermediates wastewater has become an urage problem due to the characteristics of large discharge,stable structure and bad biodegradation.In order to solve the above problems,this paper chooses the representative organic,H-acid as the target matter of naphthalene dye intermediates,and investigate the degradation of dye intermediates.As a new advanced oxidation technology,persulfate oxidation method eliminate organic pollutant by producing the sulfate radicals to attack target organic,with its mild operating environment and good oxidation resistance and attention.Studies have shown that metallic iron and cobalt work well on sulfate,while conventional homogeneous catalyst in the process of degradation of organic solution may cause the secondary pollution of metal ions,and it is difficult to finish the repeated use of metal ions.In order to solve this problem,Fe-Co/Al₂O₃ was prepared by impregnation method,and Fe-Co/MCM-41 was prepared by one-step synthesis method,which were applied for the degradation of H-acid under agitation and ultrasonic conditions.First of all,the change of Fe-Co/Al₂O₃ catalyst calcination temperature,ratio of metals and metal,determine the Fe-Co/Al₂O₃ catalyst preparation conditions,and the initial concentration,solution pH solution reaction time,dosage of oxidant on the degradation of H-acid solution.Solution pH is not adjust,initial concentration of 20mg/L,Fe-Co/Al₂O₃ 0.05 g,PMS?0.06 mol/L?1 m L condition,mixing processing 60min,the removal rate of H acid solution reach 84.8%,60 W under the ultrasonic power,the removal rate of H acid solution could reach 90.2%.Moreover,the catalyst still showed a good catalytic effect after repeated use,and the Fe-Co/Al₂O₃ catalyst has good stability.Secondly,MCM-41,Fe-Co/MCM-41 catalyst was prepared by hydrothermal synthesis,and the morphology of the catalyst had been analyzed by XRD,FT-IR and TEM.Finally,the H-acid solution had been used as the target pollutant,and the ultrasonic field was introduced to investigate the catalytic performance of MCM-41,Fe-Co/MCM-41 catalyst in different field conditions,and the degradation mechanism of H-acid had been analyzed.Experimental results are as follows:the higher metal content in the Fe-Co/MCM-41catalyst,the higher degradation of H-acid solution,but the increase of metal content may result in the collapse of the structure,in order to ensure the molecular sieve pore structure,this experiment selects the load of 0.3%Fe-Co/MCM-41,the ultrasonic power was 60 W,under 40 kHz frequency has good degradation effect,and catalyst structure stability after repeated use for many times.In the degradation process of H-acid solution,the sulfonate group was first removed,and then the naphthalene ring was deformed into small molecular organic matter.