Improvement And Analysis Of Kinetics Model Of Photocatalytic Reaction

Photocatalytic technology is an advanced wastewater renovation technology with low cost,high efficiency and no secondary pollution.Compared with the rapid development of experimental techniques,research on the data-fitting and photocatalytic process prediction is limited.In this paper,the improvement of kinetic model and the prediction of photocatalytic data are studied as follows:(1)Considering the poor fitting results in the actual data treatment,we make some modification and optimization toward the pseudo-first-order model.Here,Bi/BiOCl/Au is prepared and employed as catalyst for the photoctatlytic degradation of tetracycline(TC)and Rhodamine B(Rh B).The modified kinetic model is used to fit the experimental data obtained from the photoctatlytic degradation of tetracycline and Rh B.The results show that the modified kinetic model can better fit the experimental data of photocatalysis.(2)Since the photocatalytic reaction rate is not fixed and experimental data are discrete,a nonlinear discrete grey prediction model(DGM(1,1,q)model)is established on the basis of the discrete grey prediction model(DGM(1,1)model).Combined with the dynamic characteristics of photocatalytic reaction process,a nonlinear dynamic discrete gray model(EDGM(1,1,α))is established and used to predict the experimental data of photocatalytic TC by Bi/BiOCl/Au.Prediction results show that EDGM(1,1,α)model has a good prediction effect for photocatalytic data.(3)In order to further optimize the prediction effect,two single forecast models:Logistic model,DGM(1,1)model,are selected and analyzed,a combined forecast model is established according to variance optimal selection method.It is proved theoretically that the combined forecast model is indeed integrated with the information provided by the single forecast method.The combined forecast model is used to predict the experimental data of tetracycline photocatalytic degradation via Bi/BiOCl/Au.The experimental results show that the combined forecast model has a good effect.On the baisis of the improvement of the kinetic model,the prediction of the grey model and the combined forecast model for the photocatalytic data,we have a deeper understanding of the photocatalytic data.It is convenient for better understanding the internal mechanism and analysis the photocatalytic reaction.