摘要
AgNO_3水溶液中Ag(Ⅰ)的紫外光和可见光光致还原的速度较慢,WO_3半导体催化剂能加快Ag(Ⅰ)的光致还原,并且加入甲醇空穴捕捉剂后可显著提高Ag(Ⅰ)的光致还原率。AgNO_3溶液的浓度和酸度(pH=2～7)以及催化剂用量等均对Ag(Ⅰ)的光致还原率有一定的影响。
The photodcposion of Ag in aqueous solution of AgNO_3 has been studied in this paper. Under the irradiation of UV or visible light, the rate of direct photoreduction of silver ion is relatively slow. However, addition of WO_3 particles to the solution remarkably hasten the photoreduction of silver ion, which is depositcd on the surface of the semiconductor particles, and the photocatalytic reduction process is more efficient if the solution contains CH_3OH, which acts as scavenger of valence band holcs of the illuminated WO_3 semiconductor. The effect of concentration, pH and amount of catalyst is also investigated on the photocatalytic deposition of silver.
