CN-117960121-B - Synthesis method of adsorbent for rapidly removing methylene blue in water by using waste plastic as raw material

Abstract

The invention discloses a synthetic method of an adsorbent for rapidly removing methylene blue in water by taking waste plastics as a raw material, and belongs to the technical field of pollutant treatment. The method for synthesizing the methylene blue adsorbent by using PET as a raw material comprises the following steps of mixing a PET material, sodium chloride and zinc chloride, carbonizing to obtain a PET-based carbon material, mixing the PET-based carbon material with a polyoxometallate solution, and reacting to obtain the methylene blue adsorbent. The adsorbent synthesized by the invention has the advantages of high removal rate, short adsorption equilibrium time and the like, is beneficial to the recycling utilization of PET materials, and overcomes the defects of low removal rate, long adsorption equilibrium time and the like of the existing adsorbent. The invention converts PET material into adsorbent through carbonization, which not only promotes the upgrading cycle of PET material, but also provides another possibility for methylene blue adsorption scheme.

Inventors

• ZHANG DAN
• ZENG FEI
• ZHONG LINYUN
• XU WENBIAO

Assignees

• 北华大学

Dates

Publication Date

20260505

Application Date

20240312

Claims (8)

1. 1. The application of the methylene blue adsorbent in the field of adsorbing methylene blue is characterized in that the preparation method of the methylene blue adsorbent comprises the following steps: mixing PET material, sodium chloride and zinc chloride, carbonizing to obtain PET-based carbon material, mixing with polyoxometallate solution, and reacting to obtain the methylene blue adsorbent; the polyoxometalate solution is PMoV heteropolyacid solution.
2. 2. The use according to claim 1, wherein the mass ratio of the PET-based carbon material to the polyoxometalate is 0.2:0.023-0.20, and the polyoxometalate solution is PMoV heteropolyacid solution with a concentration of 0.2875 g/L.
3. 3. The use according to claim 2, wherein the preparation method of PMoV heteropoly acid comprises the steps of: dissolving 0.71 g of disodium hydrogen phosphate dodecahydrate and 2.44 g of sodium metavanadate in 20mL of water, stirring 5 min, adding 0.5 mL of concentrated sulfuric acid to obtain solution M, dissolving 12.10 g of sodium molybdate dihydrate in 20 of mL of water, mixing with the solution M, adding 8.5 mL of concentrated sulfuric acid, and extracting with 50mL of diethyl ether to obtain PMoV heteropolyacid.
4. 4. The use according to claim 1, wherein the mass ratio of PET material, sodium chloride and zinc chloride is 2:1:0.9.
5. 5. The use according to claim 1, wherein the carbonization comprises the steps of heating to 280 ℃ and maintaining 8 min at 10 ℃ per minute, and heating to 550 ℃ and maintaining 10 min at 10 ℃ per minute.
6. 6. The use according to claim 1, wherein the reaction is carried out at a temperature of 180 ℃ for a time of 24h.
7. 7. A method for adsorbing methylene blue, comprising the steps of: adding the methylene blue adsorbent for use according to any one of claims 1 to 6 to a solution containing methylene blue, subjecting the mixture to adsorption reaction, and recovering the methylene blue adsorbent by suction filtration.
8. 8. The method according to claim 7, wherein the mass ratio of methylene blue to methylene blue adsorbent is 0.4:5-25, and the temperature of the adsorption reaction is 5-40 ℃.

Description

Synthesis method of adsorbent for rapidly removing methylene blue in water by using waste plastic as raw material Technical Field The invention relates to the technical field of pollutant treatment, in particular to a synthetic method of an adsorbent for rapidly removing methylene blue in water by taking waste plastics as raw materials. Background Methylene blue is an industrial dye that has found wide application in printing, textile, pharmaceutical and paper applications. But it also poses a serious threat to the human and ecological environment. After the wastewater containing methylene blue is discharged into nature, the surrounding ecological environment can be seriously destroyed, and the wastewater also has the risks of cancerogenesis and the like for human beings. Nowadays, the treatment methods for methylene blue wastewater are mostly conventional precipitation, adsorption, activated sludge process, membrane technology and the like. Among these, adsorption is popular because of its high selectivity, ease of operation, and the like. However, the existing Guan Ya methyl blue adsorbent still has the problems of low removal rate, long adsorption equilibrium time and the like, and further improvement is needed. For example, the highest removal rate of the active carbon compound nFeOOH@AC synthesized in the patent CN 117228776A in 24 hours only reaches 73.4% in the range of pH value of 2-13 and the initial concentration of waste water methylene blue of 1-150 mg/L. In the patent CN 107335402A, the mangosteen shell activated carbon is adopted to adsorb methylene blue, and 99.5% of the methylene blue can be adsorbed only for 1 hour. Disclosure of Invention The invention aims to provide a synthetic method of an adsorbent for rapidly removing methylene blue in water by taking waste plastics as a raw material. The main substance component in the waste plastic is PET material, and the adsorbent synthesized by the invention has the advantages of high removal rate, short adsorption equilibrium time and the like, and overcomes the defects of low removal rate, long adsorption equilibrium time and the like of the existing adsorbent while being beneficial to the recycling utilization of the PET material. In order to achieve the above purpose, the present invention provides the following technical solutions: The invention provides a method for synthesizing methylene blue adsorbent by taking PET as raw material, which comprises the following steps: Mixing PET material, sodium chloride and zinc chloride, carbonizing to obtain PET-based carbon material, mixing with polyoxometallate solution, and reacting to obtain the methylene blue adsorbent. Preferably, the PET material is waste plastic. Preferably, the mass ratio of the PET-based carbon material to the polyoxometalate is 0.2:0.023-0.20, and the polyoxometalate solution is PMoV heteropolyacid solution with the concentration of 0.2875 g/L. More preferably, the preparation method of PMoV heteropoly acid comprises the following steps: dissolving 0.71g of disodium hydrogen phosphate dodecahydrate and 2.44g of sodium metavanadate in 20mL of water, stirring for 5min, adding 0.5mL of concentrated sulfuric acid to obtain solution M, dissolving 12.10g of sodium molybdate dihydrate in 20mL of water, mixing with the solution M, adding 8.5mL of concentrated sulfuric acid, and extracting with 50mL of diethyl ether to obtain PMoV heteropolyacid. Preferably, the mass ratio of the PET material to the sodium chloride to the zinc chloride is 2:1:0.9. Preferably, the carbonization comprises the steps of heating to 280 ℃ at 10 ℃ per minute for 8min, and heating to 550 ℃ at 10 ℃ per minute for 10min. In the preparation scheme defined by the invention, since sodium chloride lowers the melting point (283 ℃) of zinc chloride, zinc chloride can be melted at 280 ℃. In addition, the zinc chloride and the carbon material can be completely melted together in a mode of keeping the temperature at 280 ℃ for 8min, so that holes can be formed conveniently during carbonization, and the function of the pore-forming agent can be fully exerted. Preferably, the temperature of the reaction is 180 ℃ and the time is 24 hours. The second technical scheme of the invention is to provide the methylene blue adsorbent obtained by the preparation method. The third technical scheme of the invention provides application of the methylene blue adsorbent in the field of methylene blue adsorption. The third technical scheme of the invention provides an adsorption method of methylene blue, which comprises the following steps: The methylene blue adsorbent is added into a solution containing methylene blue, the methylene blue adsorbent is adsorbed and reacted, and then the methylene blue adsorbent is recovered by suction filtration. Preferably, the mass ratio of the methylene blue to the methylene blue adsorbent is 0.4:5-25, the temperature of the adsorption reaction is 5-40 ℃ and the time is 0.5-5min. More preferably, the co