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

Pending Publication Date: 2022-02-25
TAIYUAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, physical adsorbents only adsorb formaldehyde molecules on the surface of the adsorption material, without essentially changing the structure and properties of formaldehyde. If no secondary treatment is performed, formaldehyde molecules will be desorbed from the surface of the material, causing secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a lanthanum-silicon composite oxide catalyst and a method for treating high-concentration formaldehyde wastewater by using the lanthanum-silicon composite oxide catalyst, and belongs to the technical field of wastewater treatment. The lanthanum-silicon composite oxide catalyst is prepared by dropwise adding a lanthanum nitrate solution into an ethyl orthosilicate ethanol solution, reacting, drying and roasting. According to the prepared lanthanum-silicon composite oxide catalyst, the catalytic activity of the active component lanthanum oxide in the lanthanum-silicon composite oxide is improved, the activation energy of formaldehyde oxidation reaction is reduced, and the formaldehyde oxidation capability of potassium hydrogen persulfate is enhanced. The method comprises the following steps of: by taking the lanthanum-silicon composite oxide as a catalyst and potassium hydrogen persulfate as an oxidizing reagent, stirring and reacting at 25-45 DEG C for 5-60 minutes, and catalytically oxidizing formaldehyde into carbon dioxide and water. According to the method, high-concentration formaldehyde wastewater can be effectively treated, and the catalyst is easy to recover, reusable, environment-friendly, safe and non-toxic.

Description

technical field [0001] The invention relates to a lanthanum-silicon composite oxide catalyst and a method for treating high-concentration formaldehyde wastewater, in particular to a method for treating high-concentration formaldehyde wastewater by catalytic oxidation reaction, which belongs to the technical field of wastewater treatment. Background technique [0002] At present, the methods of degrading formaldehyde mainly include adsorption method, photochemical catalytic degradation method, biological enzymatic degradation method and catalytic oxidation method. Although physical adsorption has the advantages of high adsorption efficiency, simple operation and low price of adsorbent. However, physical adsorption mainly relies on the van der Waals force to adsorb formaldehyde molecules into materials with porous structures, and it is easy to achieve adsorption equilibrium. Moreover, physical adsorbents only adsorb formaldehyde molecules on the surface of the adsorption mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10C02F1/72C02F101/34
CPCB01J23/10B01J23/002C02F1/725C02F2101/34
Inventor 马庆国牛宇岚常西亮赵晓红
Owner TAIYUAN INST OF TECH
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