电镀法制备多孔光催化材料及其性能研究

以多孔泡沫镍为载体,采用电镀法制备多孔光催化材料,并研究其对水中罗丹明B的降解性能.结果表明,多孔光催化材料对水中罗丹明B的光催化降解反应严格符合零级动力学规律.最佳制备工艺条件为：电镀液中硫酸镍浓度180g/L;镀液中P25型纳米TiO2粉体投加量2g/L;电镀温度45℃;搅拌速度4档.Bi2O3和ZnO复合改性使产品的光催化性能提高,复合粉体中的Bi2O3和ZnO起电子-空穴分离的桥梁作用.纳米Bi2O3复合量达7%或ZnO复合量为2%时,产品的光催化性能最优.Ag修饰使经Bi2O3或ZnO复合的光催化材料的光催化性能有所提高.经Bi2O3复合的光催化材料的最佳Ag修饰量为1%,经ZnO复合的光催化材料的最佳Ag修饰量为4%.

Preparation of Porous Photocatalytic Materials by Electroplating and Its Performance

The porous photocatalytic material is prepared with porous nickels as carrier by electroplating method, and the photocatalytic performance of the product on degradation of Rhodamine B solution is investigated. The reaction of Rhodamine B photocatalytic degradation follows the zero order kinetics law. The optimal preparation condition of porous photocatalytic material by composite electroplating method are 180 g/L nickel sulphate concentration and 2 g/L dosage of P25 nanometer titanium dioxide in the electroplating solution, 45] and 4 grade stirring speed. The photocatalytic performance of the porous photocatalytic material is obviously improved by compounding with bismuth oxide or zinc oxide, the bismuth oxide or zinc oxide in the composite plays a role of bridge on the separation of the hole and electron. The optimal dosage of bismuth oxide and zinc oxide compound- ing is 7 % and 2 %, respectively. The photocatalytic performance of the porous photocatalytic material is updated by silver modification, the optimal silver dosage in material compounded with bismuth oxide and zinc oxide is 1% and 4 %, respectively.