Dye In Heterogeneous Fenton System Water Research

In this paper, the dynamic adsorption method was selected to filter the carrier resinfor preparation of heterogeneous Fenton system catalyst, by examining the influence ofdifferent reaction conditions on catalyst preparation, and determined the optimalreaction conditions for the dynamic adsorption preparation of heterogeneous Fentonsystem catalyst. Dynamic test was operated for the decolorization of three kinds ofsimulated wastewater. By examining the influence of different reaction conditions onthe rate of the simulated dye wastewater, the optimal dynamic experimental conditionsof decolorization reaction was determined. Through the dynamic research of the kineticsof dye wastewater degradation by heterogeneous Fenton system, Investigated theinfluence of the catalyst system prepared under different reaction conditions on reactionrate, determined the rate constant of the reaction kap, and degradation rate model of dyeXmod. Then, on the basis of the reaction mechanism and optimum reaction conditions ofdecolorization of simulated dye wastewater in heterogeneous Fenton system, exploredthe dynamic decolorization of the actual dye wastewater in a continuous reactor.Selected model D072, D061, D101, and epoxy resin001×7resin as carriers, byexamining the decolorization capability of simulated wastewater Reactive Red KE-3Bthat operated with heterogeneous Fenton system catalyst with different adsorptionamount of Fe²⁺on resin, and identified the carrier of the catalyst system. The resultsshowed that Fe²⁺adsorption on resin D072has a capacity of113.6mg·g^-1, degradationrate of reactive red dye solution of KE-3B by heterogeneous Fenton system catalystwith static method was up to97.10%.The resin D072was superior to the other threekinds of resin, determined the selection of a macroporous strong acid cation exchangeresin D072carrier as the catalyst for the heterogeneous Fenton system.The effects of carrier D072under the conditions of the Fe²⁺solution pH,concentration of Fe²⁺solution,flow rate and adsorption time of Fe²⁺adsorption capacity were evaluated by the single factor experiment, determined the best experimentalconditions for the dynamic adsorption prepared by heterogeneous Fenton systemcatalyst carrier resin D072for pH value of4, Fe²⁺concentration of2000mg· L^-1ofFe²⁺solution flow rate of15mL·min^-1and the reaction time of40min. Under thisreaction conditions, Fe²⁺adsorption of resin D072reached its maximum adsorptioncapacity of113.6mg·g^-1（dry）. The reaction of the resin D072catalyst with dynamicadsorption of Fe²⁺Prepared by the heterogeneous Fenton system met Thomas dynamicadsorption model, the exponential model is C_e/C₀=1/(1+exp(7.55×10^-2/Q(113.6×m-C₀V_eff)).Using heterogeneous Fenton system dynamic method, operated decolorization testfor three kinds of simulated dye wastewater Reactive Red KE-3B,reactive yellowKE-4R and reactive Blue KN-R, through the single factor experiments to examine thepH, H2O2dosage, catalyst dosage, reaction temperature and residence time of simulateddye wastewater effected on the simulated dye wastewater decolorization rate,determined the best decolorization reaction conditions as pH value of4, the H2O2concentration of800mg·L^-1, catalyst dosage of20g, reaction temperature of60°C andreaction residence time of9minutes. Under this reaction conditions, in HeterogeneousFenton system, degradation rate of the three kinds of simulated wastewater ReactiveRed KE-3B, Reactive Yellow KE-4R and Reactive Blue KN-R reached95.01%,93.86%and97.74%respectively.FT-IR and EDX spectra showed that the resin D072is mainlycomposed of C, O and S, not containing Fe element, Fe in the catalyst is a sulfonic acidof resin D072structure reacted with Fe²⁺complex introduced to the formation of theactive center. XRD analysis showed that, Fe²⁺was the ionic form in the catalyst carrierresin D072, there is no crystallization occurs. XPS spectroscopy analysis before andafter the experiment showed that Fe²⁺in the catalyst participate in the catalytic reaction,the electronic activation energy is reduced by2eV. SEM analysis showed that thecatalyst surface morphology of the dynamic experiments were prepared byheterogeneous Fenton reaction and after decolorization experiments, the catalyst surface morphology was smooth, without cracks, the surface morphology was similar to theoriginal resin. It could be said that the experiment using dynamic method can reduce themechanical damage to the catalyst, the protection of the mechanical strength of thecatalyst to improve the life of the catalyst.Dynamics of the heterogeneous Fenton system degradation of simulatedwastewater Reactive Red KE-3B dynamics experimental at different dye concentration,temperature of the dye solution, pH of dye solution, the dosage of H2O2and the catalystdosage conditions show that Heterogeneous Fenton system dynamic degradation ofReactive Red KE-3B kinetic model of the simulated wastewater met the pseudo firstorder reaction kinetics, reaction rate constant expression fork_ap=1.43*10^-2Cd y0e..added concentration of800mg·L^-1, the catalyst amount of20g, reaction temperature of60°C and the reaction remain time of9min, the decolorization reaction rate constant of0.0037s^-1, the activation energy of48.6kJ·mol^-1.The actual dye wastewater degradation studies with a continuous reactor （CSTR）under the best reaction conditions showed that: the catalyst system of continuousdegradation of the actual dye wastewater by300min, effluent color average of15.7times, has reached the emission standards of the chroma of textile industry waterpollutants in the relevant laws and regulations.