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以苯酚的光催化降解为模型反应，研究了锐钛矿相和金红石相二氧化钛纳米晶（7～40nm）的光催化活性．与市售的氧化钛相比，两种晶相的纳米氧化钛均有很高的光催化活性，锐钛矿相氧化钛对苯酚的深度矿化有更高的选择性．TiO2吸附的水及羟基会降低氧化钛的光催化活性．由于粒径减小使氧化钛的吸收带边界蓝移，粒径小的氧化钛有更高的催化活性，粒径＜15nm时，显示出量子尺寸效应．
The photocatalytic degradation of phenol was used as a model reaction to study the photocatalytic activity of anatase and rutile TiO2 nanocrystals (7 ~ 40nm). Compared with the commercially available titanium oxide, the nano-titanium oxide of both crystal phases has high photocatalytic activity, and the anatase phase titanium oxide has higher selectivity to the deep mineralization of phenol. TiO2 adsorption of water and hydroxyl will reduce the photocatalytic activity of titanium oxide. Titanium oxide with a small particle size has a higher catalytic activity due to the blue shift of the absorption band edge of the titanium oxide due to the decrease of the particle size. When the particle size is less than 15 nm, the quantum size effect is exhibited.