Preparation Of Visible Light Photocatalysts And The Effect Of Aquatic Particle On Their Photocatalytic Activity

The photocatalytic oxidation technology has received much attention in recent decades dueto its potential application in water treatment.However, the visible light photocatalysts haverecerved more attention because of their photocatalytic activity. In fact, particulate matter inthe sewage would affect the photocatalytic activity, moreover it is necessary to be solved.Several methods are used to synthesis photocatalysts with different morphologiesrespecticely,based on the understanding of nano-materials Cu₂O, CuS and CdS. Investigationof photocalytic activity for the visible light photocatalysts towards photodegradation ofnaphthol blue-black （NBB） and the effect of aquatic particle on their Photocatalytic activitywas studyed. The specific operation as follws:（1） The water bath method are used to synthesis a series of Cu₂O photocatalyst,Furthermore, reaction conditions such as reductant and surfactant effect on morphology andcatalytic properties of the Cu₂O was discussed. The NBB degradation was examind to assessthe pH value, initial concentration of NBB, as well as the common body of water particlessuch as clay, metal oxides（iron oxides and manganese oxides）, organic acids （fulvic acid andhumic acid） and biological particles （activated sludge）. The results demonstrated that theactivity of catalyst, which were prepared by ascorbic acid as reductant and CTAB, was muchbetter than others. The degradation efficiency of the catalyst was best when pH was7.0, andthe particulate matter as well as inhibit the photocatalytic in varying degrees.（2） A series of CuS photocatalyst were synthesed. Furthermore, the NBB degradation wasexamind to assess different reaction conditins. The result showed that the product, whichprepared by0.1mol/L precursor, is best. When the initial solution pH was7.0and the initialconcentration of NBB was40ppm, the NBB was effectively degraded best. Some of theparticles can not inhibit the activity of CuS, and the result is different from Cu₂O. Overall, theresults indicated that the poisoning effrct of CuS is better than Cu₂O.（3） Different methods are used to synthesis different morphologies of CdS photocatalysts,and found that the CdS nanowires has the best photocatalytic activity. The CdS nanowires canbe effective in degradation of the NBB in neutral and acidic conditions. Some of the particlescan not inhibit the activity of CdS, but the extent of the suppression significantly less thanCu₂O and CuS. So we believe that the CdS has the best anti-particles poisoning performance.