Experimental Study On The Preparation Of Catalysts And Treatment Of Dye Wastewater In Catalytic Wet Oxidation Technology

Catalytic wet oxidation technology has good efficiency, less coverage area, no secondarypollution, etc,overcome the economic factors caused by high requirements of the device in thepractical application of the conventional wet air oxidation,as well as the shortcomings ofincomplete oxidation reaction of wet air oxidation process and toxic intermediates.Byaddition of catalyst,reducing the reaction conditions,shortening the reaction time,therebyreduce the investment in operating costs. The pHysical and chemical properties of thecatalysts are changed the different method of catalysts preparation,thereby increase thecatalysts’ selectivity, activity, lifetime and stability.Tranisiton metal,that is,Fe,Mn,Cu,Zn, and Ni are chosen as active component and H₂O₂is chosen as the oxidant,using conventional heating to promote loading of the activecomponent to make catalysts,through the degradation of acid scarlet3R dye simulatedwastewater shows that Cu has better catalytic activity,and the silicone is proper carrier.In the process of soaking,using conventional heating to promote loading of the activecomponent,determined the best of preparation technology of the catalyst are: Cu is chosen asthe active component, and silica gel as the carrier, soaking concentration is0.15mol/L,at70°Cfor4h,after filtered, the required catalyst was dried at450℃for4hours in box-type resistancefurnace.When the waste water pH value is6,the dosage of the prepared catalyst is10g/L,thedosage of oxidant is30mL/L,react at70°C for45min in the constant temperature water bath,the decolorization efficency is about97.62%and the COD removal efficency is about85.22%.Furthermore,using time of the prepared catalyst was studied,the results showed thatthe prepared catalyst reused four times has a better effect on the degradation of acid scarlet3Rdye simulated wastewater.In the process of soaking,using microwave irradiation to promote loading of the activecomponent,determined the best of preparation technology of the catalyst are: Cu is chosen asthe active component, and silica gel as the carrier, soaking concentration is0.15mol/L,usingmicrowave heating to promote the loading of Cu on silica gel,irradiation power being460Wand irradiation time being3min, after filtered, the required catalyst was dried at450℃for4hours in box-type resistance furnace.When the waste water pH value is6,the dosage of theprepared catalyst is8g/L,the dosage of oxidant is30mL/L,react at60°C for30min in theconstant temperature water bath, the decolorization efficency is about97.62%and the CODremoval efficency is about80.94%.Furthermore,using time of the prepared catalyst was studied,the results showed that the prepared catalyst reused four times has a better effect onthe degradation of acid scarlet3R dye simulated wastewater.