| abstract |
A kind of stable dispersion and the controllable SiO of photocatalytic activity 2 @TiO 2 The preparation method of core-shell structure, includes the following steps：（1）By TiO 2 The suspension for being configured to that concentration is 100 ~ 500g/L is added in distilled water, TiO is added 2 (the NaPO of quality 0.1% ~ 0.5% 3 ) 6 As dispersing agent, 0.5-2h is stirred；（2）By step（1）Gains are heated to 60-100 DEG C, and stirring is lower while sodium silicate solution and sulfuric acid solution is added, and make the molar ratio 1 of sodium metasilicate and titanium dioxide:（5~45）, reaction system pH is 8 ~ 11, reacts 1h ~ 3h, after room temperature is aged 1.5 ~ 3h, is washed with distilled water to conductivity less than 20mS/m, obtains SiO 2 @TiO 2 Suspension；Alternatively, by SiO 2 @TiO 2 Suspension at 100 ~ 110 DEG C it is dry at least for 24 hours, grinding obtains SiO 2 @TiO 2 Powder. |