Preparation And Study On Arsenic Removal Of Supported TiO2Material

With the acceleration of the industrialization process, the pollution of arsenic is becoming more and more serious. In this paper, the conversion of trivalent arsenic [As (III)] to pentavalent arsenic [As (V)] was achieved using the photoelectrocatalysis method. It can improve efficiency of the photoelectrocatalysis because of the synergistic action between photocatalysis and electrocatalysis. And then arsenic was removed using titanium dioxide (TiO2) through the adsorption.The catalytic material used was TiO2deposited on the surface of activated carbon fiber (ACF) by means of sol-gel. The time and temperature of surface treatment and the supported fastness of the catalytic material were studied in weight method. When the time and temperature of surface treatment were3h and500℃, the pretreatment process would be better. While the roasting time and temperature and supported times were3h and500℃and3times respectively, the supported fastness was the biggest.Experiments show that the adsorption reaction reached balance after putting the catalytic material into the arsenic solution for8hours. Then three different methods (photocatalysis, electrocatalysis, and photoelectrocatalysis) were used to remove the arsenite. The photoelectrocatalytic method was shown to be better at oxidation of arsenite than the other two methods. The final removal of As were1.19mg/g (photocatalysis),1.17mg/g (electrocatalysis) and1.24mg/g (photoelectrocatalysis) respectively. The final removal of As in photoelectrocatalysis method enhanced0.15mg/g compared to the adsorption.The foamed nickel was used as base material and electroless composition plating was used to prepare the photoelectrocatalysis material (Ni-P-TiO2). Then the experiment of photoelectrocatalysis As(III) to As(V) through Ni-P-TiO2material was tested. The result indicated that the rate of As removel were raised by9.7%(photocatalysis),6.9%(electrocatalysis) and21.5%(photoelectrocatalysis) in the base of adsorption.