The invention discloses a method for preparing porous nano TiO2. The method includes steps: according to the weight ratio of
titanic acid ester, sublimable compound template,
organic solvent, acid and deionized water, (0.001%-80%):(0.00001%-50%):(0.001%-95%):(0.001%-90%):(0.001%-95%), mixing the
titanic acid ester, the sublimable compound, the
organic solvent and the acid till completely dissolved, adding the deionized water, scattering with ultrasonic for 0.1-20 hours, reacting under stirring at 25-85 DEG C for 0.1-50 hours,
ageing for 1-48 hours at
room temperature to obtain TiO2
sol containing the sublimate template, removing
solvent by means of reduced pressure
distillation,
drying at 60-130 DEG C,
roasting at 150-240 DEG C for 0.1-20 hours,
roasting at 250-340 DEG C for 0.1-20 hours,
roasting at 350-440 DEG C for 0.1-20 hours, roasting at 450 DEG C for 0.1-20 hours, cooling naturally and
grinding to obtain porous nano TiO2
solid powder. The porous nano TiO2
solid powder can be applied to photocatalytic
hydrogen production by water
decomposition, photocatalytic organic
pollutant degradation, ultrasonic absorbing materials, textiles, self-cleaning glass,
sunscreen cream, paint,
printing ink,
food packaging materials, paper industry, space industry and
lithium batteries and has wide application prospect. The method is simple and feasible in process, low in investment and beneficial to popularization and application.