Colorimetric Evaluate the Photocatalytic Activity of Photocatalytic Products

Under ultraviolet radiation,the Nano-TiO2 photocatalytic products can produce hydroxyl(·OH),which is a strong oxidation.It can oxidize I-to produce I2,which can form blue complex with water-soluble starch.Based on this,a new method was proposed for evaluating the photocatalytic activity of photocatalytic products.Compared with the traditional methyl orange degradation method,the proposed method characterized with higher sensitivity and speedy.The proposed method was successful applied to evaluate the photocatalytic activity of some photocatalytic products which bought from market,and the results were more consistent with traditional methyl orange degradation method.