The influences of the pH value of solutions, initial concentrations of chromate, purged gas and photocatalysts loading on clean-up efficiency for Cr (VI) have been investigated. In order to study the influence of phase and size effect on the photocatalytic activities, anatase and rutile TiO2 nanocrystallites were prepared, whose particle size is 9.5 nm(BET surface area 133.4 m2/g) for anatase phase and 7.5 nm (BET surface area 167.6 m2/g) for rutile phase, respectively. The results of the photocatalytic reactions indicate that the phtocatalytic activity of anatase crystallite is higher than that of rutile crystallite,however, both anatase and rutile nanosized TiO2 powders have higher photocatalytic activities than those of commercial TiO2 powder.%以二氧化钛为光催化剂，研究了溶液的pH值、铬酸根离子的初始浓度、通人的气体种类、氧化钛的载量等因素对铬酸根离子降解率的影响.同时合成了粒径小于10 nm的锐钛矿相和金红石相氧化钛纳米晶来考察晶相和尺寸效应对降解率的影响.结果表明，锐钛矿相的催化活性高于金红石相，两者的催化活性均大大高于市售的氧化钛微粉.
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