Research On Catalyst Preparation And Treatment Of Acid Red 88 By CWAO

Wet catalytic oxidation?CWAO? is an advanced environmental protection technology can reduce the reaction conditions, improve the effect of wastewater treatment by adding a suitable catalyst and oxidant. The new method of wastewater treatment was taken as foothold,this article studied the preparation technology of catalyst and the treatment effect of dye wastewater AR88 which has important practical significance.Acid Red 88?AR88? was took as the object, made research on catalyst carrier, active component types and concentration, dipping temperature, roasting temperature and time etc that affect the catalytic activity of the catalyst, and prepared a single active component of catalyst?1#?. After that, made research on the modification of catalyst, determined the modification methods and found the best preparation conditions?2#?. It analyzed the surface morphology by SEM, qualitative and semi-quantitative by XRD and specific surface area by BET. Using two kinds of homemade catalysts 1#?2# to treat AR88, researched the factors such as catalyst, oxidant dosage, pH, reaction temperature and initial concentration have effect on the result of CWAO, also the kinetics of reaction process were studied. The experimental results showed that:?1? The optimal conditions to prepare 1# catalyst: lithium silicon powder 0# as carrier,under the condition of 40 ? impregnated 0.1 mol/L Fe?NO₃?₃ 20 hours, and then roasted 90 minutes under 500?.?2? The optimal conditions to prepare 2# catalyst : lithium silicon powder 0# as carrier,under the condition of 40 ? impregnated mixed solution which was prepared by 0.1 mol/L Fe?NO₃?₃ and Zn?NO₃?₂ according to 1:1 20 hours, and then roasted 150 minutes under400?.?3? 1#?2# catalysts are quite different with lithium silicon powder in the specific surface area?Pore volume?Pore diameter. Increased 5.48%?47.70% in the specific surface area,33.33%?16.67% in Pore volume, 0.95%?2.08 in Pore diameter compared with 0#. And the C value of 1#?2# are 1.455 times, 2.995 times that of 0#.?4? 1 # as the catalyst, the optimal reaction conditions is: the amount of catalyst is 15 g /L?oxidant is 5ml / L, reaction after 120 minutes at 40 ?. And in this condition, 1 # catalyst was used to handle AR88 which concentration below 200 mg/L, the decolorization rate was over 96%.?5? 2# as the catalyst, the optimal reaction conditions is: the amount of catalyst is 14 g /L?oxidant is 5ml / L, reaction after 90 minutes at 40 ?. And in this condition, 2# catalyst was used to handle AR88 which concentration below 400 mg/L, the decolorization rate was over99%.?6? Reaction kinetics was studied, found that both of the reaction process in treatment of AR88 by using of 1#and2# can meet the first order kinetics equation. The reaction activation energy of 1#catalyst is 50.98 KJ/mol; the reaction activation energy of 2#catalyst is 21.91KJ/mol.