Sodium persulfate sustained-release agent suitable for catalytic oxidation degradation of antibiotics and preparation and application of sodium persulfate sustained-release agent

Abstract

The invention discloses a sodium persulfate sustained-release agent suitable for catalytic oxidation degradation of antibiotics, preparation of the sodium persulfate sustained-release agent and application of the sodium persulfate sustained-release agent in remediation of soil and underground water polluted by antibiotics. The sodium persulfate sustained-release agent is prepared from the following raw materials in percentage by mass: 30-50% of paraffin, 30-50% of quartz sand, 1-4% of ordered mesoporous manganese oxide and 10-20% of sodium persulfate, wherein the ordered mesoporous manganese oxide is prepared by a hard template method, and a template agent adopts SBA-15. The preparation method comprises the steps of (1) adding paraffin into absolute ethyl alcohol, heating to the temperature of 60-80 DEG C, and after the paraffin is completely melted, sequentially adding a surfactant, quartz sand, ordered mesoporous manganese oxide and sodium persulfate into the paraffin while stirring; and (2) cooling the molten material obtained in the step (1) to obtain the sodium persulfate sustained-release agent. The sodium persulfate sustained-release agent is good in coating effect, low in release rate, good in permeability and adsorptivity and good in oxidative degradation characteristic.

Description

technical field

[0001] The invention relates to the technical field of soil and groundwater remediation, in particular to a sodium persulfate (Na persulfate) suitable for catalytic oxidation degradation of antibiotics 2 S 2 o 8 ) sustained-release agent and its preparation and application. Background technique

[0002] With the continuous development of economy and society, my country's soil and groundwater environment have been seriously threatened by pollution in recent years. In particular, due to the complex geological characteristics of groundwater, the encapsulation of soil, the dynamics of groundwater and the synergy of microorganisms can hide pollutants here, which makes it extremely difficult to deal with pollutants in groundwater. If only relying on natural degradation, it will take hundreds to thousands of years for these organic pollutants to reach a harmless level. Therefore, it is necessary to develop a practical and effective treatment method to solve soil ...

Examples

preparation example Construction

[0046] The preparation method of ordered mesoporous manganese oxide in the specific embodiment:

[0047] (1) Add 4mL of 50wt% manganese nitrate aqueous solution into 50mL of absolute ethanol suspension containing 3g of SBA-15, stir at 0°C for 4h and then add ammonia to adjust the pH of the reaction system to 11 after stirring for 4h, centrifuge after continuing to stir for 15min Separating, washing the solid product until neutral, drying at room temperature and calcining at 400°C for 4 hours to obtain the calcined product;

[0048] (II) replace SBA-15 with described calcined product, repeat step (I), obtain composite product;

[0049] (III) Disperse the composite product evenly in 200mL of 2mol / L sodium hydroxide solution, heat to boil, react to remove SBA-15 under reflux conditions, centrifuge after the reaction, wash the solid precipitate until neutral, vacuum at 60°C Dry for 24 hours to obtain the ordered mesoporous manganese oxide.

Embodiment 1

[0051] Use commercial manganese dioxide (Sinopharm Chemical Reagent Co., Ltd., analytically pure) to be a catalyzer, catalyze sodium persulfate to degrade tetracycline, control the initial concentration of tetracycline to be 20mg / L, catalyzer=0.1g / L, Na 2 S 2 o 8 = 2 mmol / L.

Embodiment 2

[0053] Use ordered mesoporous manganese oxide as a catalyst to catalyze sodium persulfate to degrade tetracycline, adopt the same test conditions as in Example 1, control the initial concentration of tetracycline to be 20mg / L, catalyst=0.1g / L, Na 2 S 2 o 8 = 2 mmol / L.

technical field

[0001] The invention relates to the technical field of soil and groundwater remediation, in particular to a sodium persulfate (Na persulfate) suitable for catalytic oxidation degradation of antibiotics 2 S 2 o 8 ) sustained-release agent and its preparation and application. Background technique

[0002] With the continuous development of economy and society, my country's soil and groundwater environment have been seriously threatened by pollution in recent years. In particular, due to the complex geological characteristics of groundwater, the encapsulation of soil, the dynamics of groundwater and the synergy of microorganisms can hide pollutants here, which makes it extremely difficult to deal with pollutants in groundwater. If only relying on natural degradation, it will take hundreds to thousands of years for these organic pollutants to reach a harmless level. Therefore, it is necessary to develop a practical and effective treatment method to solve soil ...

Examples

preparation example Construction

[0046] The preparation method of ordered mesoporous manganese oxide in the specific embodiment:

[0047] (1) Add 4mL of 50wt% manganese nitrate aqueous solution into 50mL of absolute ethanol suspension containing 3g of SBA-15, stir at 0°C for 4h and then add ammonia to adjust the pH of the reaction system to 11 after stirring for 4h, centrifuge after continuing to stir for 15min Separating, washing the solid product until neutral, drying at room temperature and calcining at 400°C for 4 hours to obtain the calcined product;

[0048] (II) replace SBA-15 with described calcined product, repeat step (I), obtain composite product;

[0049] (III) Disperse the composite product evenly in 200mL of 2mol / L sodium hydroxide solution, heat to boil, react to remove SBA-15 under reflux conditions, centrifuge after the reaction, wash the solid precipitate until neutral, vacuum at 60°C Dry for 24 hours to obtain the ordered mesoporous manganese oxide.

Embodiment 1

[0051] Use commercial manganese dioxide (Sinopharm Chemical Reagent Co., Ltd., analytically pure) to be a catalyzer, catalyze sodium persulfate to degrade tetracycline, control the initial concentration of tetracycline to be 20mg / L, catalyzer=0.1g / L, Na 2 S 2 o 8 = 2 mmol / L.

Embodiment 2

[0053] Use ordered mesoporous manganese oxide as a catalyst to catalyze sodium persulfate to degrade tetracycline, adopt the same test conditions as in Example 1, control the initial concentration of tetracycline to be 20mg / L, catalyst=0.1g / L, Na 2 S 2 o 8 = 2 mmol / L.

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