The Study On Preparation And Photocatalytic Properties Of ZnO Nanorod/PVC Composite

As one of important problems which human faced and being to solve,the control and treatment of environmental pollution has attracted more attention.Currently, semiconductor photocatalysis technology used for water and air treatment showed lots of advantages,such as simple operation,low energy,high efficiency,less secondary pollution.ZnO is one of important semiconductors,has been applied to photocatalysis wildly because of nontoxic,low cost and simple preparation.However,It can only be stimulated by UV light,has high combination of e~+ and h~+ and low efficiency of photocatalytic reaction when the practical application of ZnO alone.Therefore the practical application of photocatalysis technology is limited.In this paper,ZnO nanorod/PVC composite had been synthesized through complexing ZnO nanorod which was prepared by hydrothermal method and polymer PVC.Also,this paper had studied it from several aspects as follows:1.Hydrothermal synthesis and photocatalytic properties of ZnO nanorodZnO nanorod was prepared by hydrothermal method in the presence of surfactant Pluronic F-127.The product was characterized by XRD,TEM,FE-SEM,IR and ESR. Also,the photocatalytic properties were investigated using methyl orange(MO) as a probe reaction.Otherwise,we analyzed the effects of preparations of ZnO nanorod, discussed the growth mechanism of ZnO nanorod.The experiment suggested that ZnO nanorod was typically 140nm in diameter and 1.5μm in length with an aspect ratio 10.7.The product had good dispersant,narrow diameter and no impurities inserted.Degradation ratios of MO solution was 30%under ultraviolet light.2.Study on the photocatalytic property of ZnO nanorod/PVC compositeZnO nanorod/PVC composite was synthesized by mixing solution method.Also, we studied on the photocatalytic properties of this composite under visible light, evaluated the effect of preparations using methyl orange(MO) as a probe reaction.The experiment showed that the optimum conditions for preparing it were:the mass ratio of ZnO nanorod and PVC was 1:1,calcined temperature was 250℃,calcined time was 1h.Otherwise,the composite can degrade MO up to 80%under visible light for 3h when the concentration of MO was 10mg/L,and the dose of photocatalyst was 0.5g/L.3.Photocatalytic degradation of MO with ZnO nanorod/PVC compositeThe experiment investigated the effects of the amount of photocatalyst,initial concentration of MO solution and pH valve on the photocatalytic properties of ZnO nanorod/PVC composite.Results showed the photocatalytic degradation rate of MO solution increased with the increasing amount of photocatalyst,when the MO initial concentration was higher,the speed of degradation would be slower,the time to be the same degradation would be longer.Besides,it would attained the most photocatalytic degradation ratios of MO when the pH valve was six.4.Photocatalytic degradation of aniline with ZnO nanorod/PVC compositeThe experiment studied the influences of the dose of photocatalyst,aniline intial concentration and pH valve of solution on the photocatalytic properties of ZnO nanorod/PVC composite.Results indicated that the photocatalytic degradation rate of aniline solution increased with the increasing amount of photocatalyst,when the initial concentration of aniline solution was higher,the speed of photocatalytic degradation would be slower.Otherwise,when the pH valve was eleven,it would attained the most degradation ratios of aniline solution.