Lanthanum-silicon composite oxide catalyst and method for treating high-concentration formaldehyde wastewater by using lanthanum-silicon composite oxide catalyst
A composite oxide, high-concentration formaldehyde technology, used in metal/metal oxide/metal hydroxide catalysts, oxidized water/sewage treatment, physical/chemical process catalysts, etc., can solve problems such as secondary pollution and increase Stability, simple preparation method, and effect of enhancing the ability to oxidize formaldehyde
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Embodiment 1
[0013] (1) preparation concentration is respectively the lanthanum nitrate solution that concentration is 15wt% tetraethyl orthosilicate ethanol solution and concentration, in stirring condition, drips the lanthanum nitrate solution of 30wt% in tetraethyl orthosilicate ethanol solution, drops The ratio of the amount of substances added to lanthanum nitrate and tetraethyl orthosilicate is 5:1, after dropping, raise the temperature to 70°C and stir until the solution becomes a viscous colloid, transfer to an oven, dry at 80°C for 8h, and then transfer Baking at 800°C for 6 hours in a muffle furnace to obtain solid powder lanthanum-silicon composite oxide.
[0014] (2) adding formaldehyde concentration in the 100mL there-necked flask is the waste water of 1g / L, then add potassium persulfate and the lanthanum-silicon composite oxide catalyst prepared in step (1) successively, to the final concentration of potassium persulfate in the above-mentioned waste water The final concentrat...
Embodiment 2
[0016] (1) preparation concentration is respectively the lanthanum nitrate solution that concentration is 15wt% tetraethyl orthosilicate ethanol solution and concentration, in stirring condition, drips the lanthanum nitrate solution of 30wt% in tetraethyl orthosilicate ethanol solution, drops The ratio of the amount of substances added to lanthanum nitrate and ethyl orthosilicate is 25:1. After dropping, raise the temperature to 70°C and stir until the solution becomes a viscous colloid. Transfer to an oven, dry at 80°C for 8 hours, and then transfer Baking at 800°C for 6 hours in a muffle furnace to obtain solid powder lanthanum-silicon composite oxide.
[0017] (2) adding formaldehyde concentration in the 100mL there-necked flask is the waste water of 1g / L, then add potassium persulfate and the lanthanum-silicon composite oxide catalyst prepared in step (1) successively, to the final concentration of potassium persulfate in the above-mentioned waste water The final concentra...
Embodiment 3
[0019] (1) preparation concentration is respectively the lanthanum nitrate solution that concentration is 15wt% tetraethyl orthosilicate ethanol solution and concentration, in stirring condition, drips the lanthanum nitrate solution of 30wt% in tetraethyl orthosilicate ethanol solution, drops The ratio of the amount of substances added to lanthanum nitrate and tetraethyl orthosilicate is 5:1, after dropping, raise the temperature to 70°C and stir until the solution becomes a viscous colloid, transfer to an oven, dry at 80°C for 8h, and then transfer Baking at 800°C for 6 hours in a muffle furnace to obtain solid powder lanthanum-silicon composite oxide.
[0020] (2) adding formaldehyde concentration in the 100mL there-necked flask is the waste water of 1g / L, then add potassium persulfate and the lanthanum-silicon composite oxide catalyst prepared in step (1) successively, to the final concentration of potassium persulfate in the above-mentioned waste water The final concentrat...
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