CN-121988323-A - Ferrous silicate catalytic material and preparation method and application thereof

Abstract

The invention discloses a ferrous silicate catalytic material, a preparation method and application thereof, and belongs to the technical field of catalytic materials. The sodium silicate solution is slowly and uniformly added into the ferrous sulfate solution, the reaction is stirred and carried out under the proper pH condition, and the reaction product is filtered, washed and dried to obtain the ferrous silicate catalytic material, so that the obtained ferrous silicate catalytic material has the characteristics of an amorphous crystal phase structure, nano particle morphology and positive charge on the surface, has higher adsorption activity on anionic organic pollutants, and can catalyze peroxide to oxidize and degrade the organic pollutants, thereby improving the degradation rate of the organic pollutants.

Inventors

• HAN HAISHENG
• LIU YI
• WANG YUFENG
• SUN WEI
• LI DONG
• Leng Xinjun

Assignees

• 中南大学

Dates

Publication Date

20260508

Application Date

20260128

Priority Date

20260126

Claims (10)

1. 1. The preparation method of the ferrous silicate catalytic material is characterized in that sodium silicate solution is slowly and uniformly added into ferrous sulfate solution, stirred and reacted under the condition of pH=5-9, and the reaction product is obtained through filtration, washing and drying; the molar ratio of sodium silicate in the sodium silicate solution to ferrous sulfate in the ferrous sulfate solution is 0.5:1-1.5:1.
2. 2. The method for preparing a ferrous silicate catalytic material according to claim 1, wherein the molar ratio of sodium silicate in the sodium silicate solution to ferrous sulfate in the ferrous sulfate solution is 0.5:1-0.75:1.
3. 3. The method for preparing the ferrous silicate catalytic material according to claim 1 or 2, wherein: The concentration of the ferrous sulfate solution is 150-250 g/L; The concentration of the sodium silicate solution is 50-150 g/L.
4. 4. The method for preparing a ferrous silicate catalytic material according to claim 1, wherein the pH=5-7 in the reaction process.
5. 5. The method for preparing the ferrous silicate catalytic material according to claim 1, wherein the reaction condition is that the temperature is room temperature and the time is 0.5-4 h.
6. 6. The method for preparing a ferrous silicate catalytic material according to claim 5, wherein the reaction time is 0.5 h-1.0 h.
7. 7. The preparation method of the ferrous silicate catalytic material is characterized in that the drying is performed in a drying or natural drying mode, the drying temperature of the drying is 95-105 ℃, the time is 1-2 h, and the drying time of the natural drying is 1-3 days.
8. 8. A ferrous silicate catalytic material characterized by being obtained by the preparation method according to any one of claims 1 to 7.
9. 9. The method of oxidizing and degrading organic pollutants in a water body with a peroxide, as set forth in claim 8.
10. 10. The use of the ferrous silicate catalytic material of claim 8, wherein the organic contaminant comprises at least one of methyl orange, xanthate, benzohydroxamic acid, methylene blue, phenol; The pH of the water body is=3-9.

Description

Ferrous silicate catalytic material and preparation method and application thereof Technical Field The invention relates to a catalytic material, in particular to a ferrous silicate catalytic material, a preparation method of the ferrous silicate catalytic material and application of the ferrous silicate catalytic material in catalyzing oxydol to oxidize and degrade organic pollutants, and belongs to the technical field of catalytic materials. Background Advanced oxidation technology, especially catalytic oxidation method based on persulfate or hydrogen peroxide, has become a research hot spot in the field of environmental remediation because of its ability to generate active radicals (such as sulfate radicals and hydroxyl radicals) with strong oxidizing property, and to degrade such refractory pollutants with high efficiency. The core of catalytic oxidation technology is the catalyst. Currently, commonly used catalysts mainly include homogeneous catalysts (e.g., iron ions, copper ions) and heterogeneous catalysts (e.g., metal oxides, supported nanomaterials, carbon-based materials). However, these materials still have significant limitations in practical applications, 1) the narrow pH applicability, and the activity of many high-efficiency catalysts, especially catalysts based on transition metals such as iron, manganese, etc., is strongly dependent on the pH of the reaction system. For example, classical Fenton or Fenton-like catalysts can only maintain high activity and stability under strongly acidic conditions, and are susceptible to leaching of metal ions or formation of hydroxide precipitates in neutral or alkaline environments, resulting in catalyst deactivation and secondary pollution. This greatly limits its use in treating actual wastewater (which often has a variable or neutral/alkaline pH). 2) The stability and the circularity are poor, the activity of partial heterogeneous catalyst is obviously reduced in a wide pH range, active components are easily dissolved out or the structure is collapsed in the use process, the catalytic performance is rapidly attenuated, the recycling is difficult, and the running cost is increased. 3) The activation efficiency is single, and many catalysts can only effectively activate one oxidant (such as peroxymonosulfate or hydrogen peroxide), or rely on external energy input such as light, electricity and the like to maintain the activity in a wide pH range, and the application scene and conditions are strictly limited. Disclosure of Invention Aiming at the defects existing in the prior art, the first aim of the invention is to provide a ferrous silicate catalytic material which has the characteristics of an amorphous crystal phase structure, a nano particle morphology, positive charges on the surface and the like, has higher adsorption activity on anionic organic pollutants, and can catalyze peroxide to oxidize and degrade the organic pollutants, so that the degradation rate of the organic pollutants is improved. The second aim of the invention is to provide a preparation method of the ferrous silicate catalytic material, which is simple, low in cost and mild in condition, and meets the industrial production. The third purpose of the invention is to provide an application of the ferrous silicate catalytic material in catalyzing peroxide to oxidize and degrade organic pollutants in water, which can adapt to a wide pH range (such as pH 3-11), breaks through the conventional catalysis of Fenton and can only catalyze and degrade the pollutants under acidic conditions, and has high catalytic activity, excellent stability and good recycling performance. In order to achieve the technical aim, the invention provides a preparation method of a ferrous silicate catalytic material, which comprises the steps of slowly adding a sodium silicate solution into a ferrous sulfate solution at a constant speed, stirring for reaction under the condition of pH=5-9, and filtering, washing and drying a reaction product to obtain the ferrous silicate catalytic material; the molar ratio of sodium silicate in the sodium silicate solution to ferrous sulfate in the ferrous sulfate solution is 0.5:1-1.5:1. The key of the preparation process of the ferrous silicate catalytic material is that the morphology and crystal phase of the synthesized ferrous silicate can be controlled by cooperatively controlling the feeding mode, the pH condition and the material ratio so as to obtain the ferrous silicate catalytic material with good adsorption performance and high catalytic activity. On one hand, the isoelectric point of the ferrous silicate material is regulated by regulating the molar ratio of sodium silicate to ferrous sulfate, the ratio of the sodium silicate to the ferrous sulfate is controlled within a proper range, the ferrous silicate material with high isoelectric point can be obtained, the surface of the ferrous silicate material is positively charged, so that the ferrous silicate material h