Method for removing arsenic with platinum doped titanium dioxide photoelectrocatalysis oxidization
A titanium dioxide and photoelectric catalysis technology, applied in the field of water treatment, can solve the problems of low removal efficiency of trivalent arsenic, inability to remove quickly and completely, and high cost, and achieve the effects of shortening treatment time, improving photocatalytic activity, and reducing treatment costs.
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Embodiment 1
[0018] Such as figure 1 As shown, add 100 μmol / L NaAsO in the reactor 2 Solution 500mL. A UV lamp with a power of 4W was placed on top of the reactor. 25g of activated carbon-supported platinum doped with 0.1% titanium dioxide by mass percentage was placed at the bottom of the reactor as the anode, and the carbon rod as the cathode, and the applied cell pressure was 2V. The air enters the reactor through the bottom aeration device, the dosage is 10g / h, and the reaction time is 30 minutes.
[0019] Pure pure titanium dioxide photocatalysis and platinum-doped titanium dioxide photocatalysis arsenic solution, after determination, its removal rates were 35% and 77%, while NaAsO treated under the above conditions 2 The solution, as determined, has a removal rate of 95%, which has a good oxidation removal effect.
Embodiment 2
[0021] Such as figure 1 As shown, 500 mL of wastewater with an initial arsenic content of about 1000 μmol / L was added to the reactor. A UV lamp with a power of 9W was placed on top of the reactor. 25g of activated carbon-supported platinum doped with 0.1% titanium dioxide by mass percentage was placed at the bottom of the reactor as the anode, and the carbon rod as the cathode, and the applied cell pressure was 2V. The air enters the reactor through the bottom aeration device, the dosage is 10g / h, and the reaction time is 30 minutes.
[0022] Pure pure titanium dioxide photocatalysis and platinum-doped titanium dioxide photocatalysis arsenic-containing wastewater have a removal rate of 23% and 73% respectively, and the arsenic-containing wastewater treated under the above conditions has a removal rate of 91% after measurement , has a good oxidation removal effect.
Embodiment 3
[0024] Such as figure 1 As shown, add 100 μmol / L NaAsO in the reactor 2 Solution 500mL. A UV lamp with a power of 4W was placed on top of the reactor. 25g of activated carbon-supported platinum doped with 0.1% titanium dioxide by mass percentage was placed at the bottom of the reactor as an anode, a carbon rod as a cathode, and a cell pressure of 4V was applied. The air enters the reactor through the bottom aeration device, the dosage is 10g / h, and the reaction time is 30 minutes.
[0025] Pure pure titanium dioxide photocatalysis and platinum-doped titanium dioxide photocatalysis arsenic solution, after determination, its removal rates were 35% and 77%, while NaAsO treated under the above conditions 2 The solution, as determined, has a removal rate of 98%, which has a good oxidation removal effect.
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