Photocatalytic Degradation Of Nitrobenzene Wastewater With Titania-containing Slag

In this paper, nitrobenzene wastewater was prepared and titania-containing slag applied as photocatalysts in the heterogeneous photocatalytic degradation of nitrobenzene(NB).Characterized photo-catalyst and its photocatalytic activity by chemical analysis, X-ray diffraction(XRD), Scanning electron microscope(SEM), UV-vis diffuse reflection analysis,wettability analysis, grading analysis and so on, which supplies effective theory basis for this experiment.The adsorption of titania-containing slag photocatalysts was studied. The adsorption time, nitrobenzene content, light time for the degradation of nitrobenzene were discussed. The results showed that there was an optimal range of adsorption time, nitrobenzene content, light time. When the numeric values of the above factors over a certain value,the effect of increase pressure was inconspicuous in the degradation of nitrobenzene. The adsorption of nitrobenzene on titania-containing slag obeyed Langrnuir isotherm model. The degradation performance of nitrobenzene is best when the adsorption time was25min, nitrobenzene content was150mg/L and light time was1h.In this paper, studyed on the titania-containing slag as photocatalysis degradation of nitrobenzene. Then, added surfactant under these conditions to discuss the removal rate of nitrobenzene. The results from orthogonal design demonstrating the order about the effection of the four factors was catalyst>surfactant>pH values>light source. By discussing three kinds of surfactant amounts, the degradation performance of nitrobenzene was best when the DBS concentration was0.15mg/L. By high temperature processing of concentrated titania ore(CTO), iron ore tailings(IOT) and titanium ore tailings(TOT), the results from experiments showed that when the calcination temperature was600℃, the photocatalytic activity of tailings was best. The order of photocatalytic activity was high-titania slag(HTS)>CTO (600℃)>IOT(600℃)>TOT(600℃)>pangang slag(PS). When the reaction temperature was higher, the removal rate of nitrobenzene was better. The optimal conditions were as follow:reaction temperature as40℃, pholocatalyst as HTS, pH values as7, DBS concentration as0.15mg/L, light source as xenon flash lamp and light time as180min, which achieved the best treating result with42.8%nitrobenzene removed. In this paper, studyed on the titania-containing slag as photocatalysis degradation of nitrobenzene by titania-containing slags. Then, added electronparamagnetic resonancen under these conditions to discuss the removal rate of nitrobenzene. The results showed that the degradation of nitrobenzene was improved under the photocatalytic degradation of nitrobenzene system by carbinol, alcohols and there was an optimal range when carbinol and alcohols were2mg/L. Formaldehyde and dibutyl phthalate had restrained effection, while Ag+and Cr6+had accelerated effection about the degradation of nitrobenzene. There was little affection of Co3+, Fe3+and Ce4+. The degradation of nitrobenzene was enhanced by added NaCIO, KMnO4and H2O2. When added H2O2into the photocatalytic degradation of nitrobenzene experiment,the degradation of nitrobenzene was achieved97.2%.