Visible light catalytic pigment as well as preparation method and application thereof
A visible light and pigment technology, applied in chemical instruments and methods, inorganic pigment treatment, physical/chemical process catalysts, etc. Improve photocatalytic efficiency, low price and good dispersibility
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[0039] The present invention provides a kind of preparation method of visible light catalytic pigment, and this method comprises the following steps:
[0040] (1) Crystal nucleus preparation: 1000mL of 0.1-0.3mol / L Fe 3+ Put the solution into the reactor and heat up to 80-90°C; add the alkaline precipitant into the reactor at a rate of 1-2mL / min, and control the pH at the end point between 1.5-2.5. The purpose of adding the alkaline precipitant is to neutralize Fe 3+ The acid generated from hydrolysis shifts the reaction to the forward reaction.
[0041]
[0042] Commonly used alkaline precipitant in step (1) is Na 2 CO 3 , CaCO 3 , CaO, NaHCO 3 , NaOH, K 2 CO 3 、KHCO 3 , KOH, Mg(OH) 2 , MgCO 3 , MgO, NH 4 One or more of OH, preferably NaOH.
[0043] (2) Coating: Prepare 1-3mol / L Fe 3+ and Ti 4+ Mixed solution, where Fe 3+ and Ti 4+ The molar ratio is 5-9:1-5, and at a temperature of 80-90°C and a pH of 2-2.5, it is added into the reaction kettle at a rate o...
Embodiment 1
[0050] Crystal nucleus preparation: 1000mL of 0.2mol / L FeCl 3 Put the solution into the reaction kettle and raise the temperature to 85°C; add the metered ammonia water into the reaction kettle at a rate of 1.5mL / min, and control the end point pH=2;
[0051] Coating: configure 2mol / L FeCl 3 and TiCl 4 mixed solution, control Fe 3+ and Ti 4+ The molar ratio of TiO is 5:5, and it is added into the reactor at a speed of 1.5mL / min to obtain TiO in the final product. 2 The quality score of the product is 25%;
[0052] Calcination: The precipitated intermediate product is washed and dried several times and then placed in a muffle furnace for calcination at 700°C for 20 minutes;
[0053] Grinding: After being ground and dispersed by jet mill, a visible light catalytic pigment is made.
[0054] The composition of the product can be seen in the appendix figure 1 , it can be seen that in the XRD pattern, there are both iron oxide peaks and titanium dioxide peaks, indicating that ...
Embodiment 2
[0056] Crystal nucleus preparation: 1000mL of 0.1mol / LFeNO 3 Put the solution into the reaction kettle and raise the temperature to 80°C; add the metered ammonia water into the reaction kettle at a rate of 1mL / min, and control the end point pH=1.5;
[0057] Coating: configure 3mol / L FeNO 3 and TiOCl 2 mixed solution, control Fe 3+ and Ti 4+ The molar ratio of TiO is 3:7, and it is added into the reactor at a speed of 1mL / min to obtain TiO in the final product. 2 The quality score is 40%;
[0058] Calcination: The precipitated intermediate product is washed and dried several times, then placed in a muffle furnace and calcined at 800°C for 10 minutes;
[0059] Grinding: Finally, after being dispersed by sand grinding, a visible light catalytic pigment is made.
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