Modification method for enhancing visible light response of titanium dioxide photocatalyst
A titanium dioxide and photocatalyst technology, applied in the field of photocatalysis, can solve the problems of high energy consumption, unsafe operation, unfavorable expansion reaction, etc., and achieve the effects of low energy consumption, safe operation and simple process
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Embodiment 1
[0046]Step 1. Stir 400mg of original nano-titanium dioxide powder and 60g of ethylene glycol at room temperature to obtain a well-mixed suspension (the mass ratio of titanium dioxide to ethylene glycol is 1:150);
[0047] Step 2. Put the suspension in a round-bottomed flask equipped with a condenser tube, heat it to 197°C, make the solvent ethylene glycol boil and evaporate and condense and reflux, keep it for 4 hours, naturally cool to room temperature, centrifuge, and wash with ethanol four times, After vacuum drying at 40°C for 12h, white powder was obtained;
[0048] Step 3. The white powder is placed in a tube furnace under the protection of an argon atmosphere, and after calcination at 350° C. for 2 hours, a gray titanium dioxide powder is obtained.
[0049] The degradation curve of the titanium dioxide powder prepared in Example 1 degrading methylene blue under visible light conditions is as follows: figure 2 As shown, the degradation rate of methylene blue was 32% af...
Embodiment 2
[0051] Step 1. Stir 700mg of original nano titanium dioxide powder and 100g of ethylene glycol at room temperature to obtain a uniformly mixed suspension (the mass ratio of titanium dioxide to ethylene glycol is 1:142.86);
[0052] Step 2. Put the suspension in a round-bottomed flask equipped with a condenser, heat it to 197°C, make the solvent ethylene glycol boil and evaporate, condense and reflux, keep it for 3 hours, naturally cool to room temperature, centrifuge, and wash with ethanol four times, After vacuum drying at 40°C for 12h, white powder was obtained;
[0053] Step 3. The white powder is placed in a tube furnace under the protection of an argon atmosphere, and after calcination at 450° C. for 3 hours, a dark gray powder of titanium dioxide is obtained.
[0054] The degradation curve of the titanium dioxide powder prepared in Example 2 degrading methylene blue under visible light conditions is as follows: Figure 4 As shown, the degradation rate of methylene blue ...
Embodiment 3
[0056] Step 1. Stir 600mg of original nano titanium dioxide powder and 120g of ethylene glycol at room temperature to obtain a well-mixed suspension (the mass ratio of titanium dioxide to ethylene glycol is 1:200);
[0057] Step 2. Put the suspension in a round-bottomed flask equipped with a condenser, heat it to 197°C, make the solvent ethylene glycol boil and evaporate, condense and reflux, keep it for 2 hours, naturally cool to room temperature, centrifuge, and wash with ethanol four times, After vacuum drying at 40°C for 12h, white powder was obtained;
[0058] Step 3. The white powder is placed in a tube furnace under the protection of an argon atmosphere, and after calcination at 550° C. for 2 hours, a black titanium dioxide powder is obtained.
[0059] The degradation curve of the titanium dioxide powder prepared in Example 3 degrading methylene blue under visible light conditions is as follows: Image 6 As shown, the degradation rate of methylene blue was 60% after 2 ...
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