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Persulfate gel slow-release agent as well as preparation method and application thereof

A persulfate and slow-release agent technology, applied in the field of water treatment, can solve the problems of continuous degradation of pollutants, sulfate limitation, waste of persulfate, etc., to improve continuous repair efficiency, adjust system viscosity, change flow sex change effect

Active Publication Date: 2020-08-18
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, persulfate has its own disadvantages: direct one-time dosing of persulfate, when repairing nitrobenzene organic pollution plumes, because persulfate migration is mainly concentrated in areas with relatively high permeability , so that the pollutants in the low-permeability zone cannot be effectively removed, and a large amount of persulfate does not directly react with the pollutants, and passes away with the action of the water flow, which cannot achieve the purpose of continuously degrading pollutants, thus causing a large amount of waste of persulfate
[0008] In order to overcome the above problems, it is necessary to find a new method to solve the problem that persulfate is limited in practical application.

Method used

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  • Persulfate gel slow-release agent as well as preparation method and application thereof
  • Persulfate gel slow-release agent as well as preparation method and application thereof
  • Persulfate gel slow-release agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Weigh 0.25g of sodium lauryl sulfate solid of analytically pure AR and add it to a beaker containing 20mL of alkaline silica sol solution, wherein the silica of alkaline silica sol is nanoparticles with a particle size of 60-120nm , to obtain solution A.

[0038] (2) Add 4 mL of γ-(methacryloyloxy)propyltrimethoxysilane solution to the beaker to modify it, adjust the pH to 7.5 with dilute hydrochloric acid, and stir at 200 rpm for 1 hour until it is completely dissolved. Solution B is obtained.

[0039] (3) Add 0.5 g of potassium persulfate into the prepared gelatin solution with a mass fraction of 10 wt %, mix and stir evenly to obtain solution C.

[0040] (4) Add the prepared solution C into the solution B, mix and stir evenly, and obtain an amorphous injectable persulfate gel slow-release agent.

[0041] (5) Cover the beaker with a plastic wrap, place it in a fume hood for 10 minutes at room temperature and statically seal it to make it gel, and when there is n...

Embodiment 2

[0045] The persulfate gel slow-release agent that embodiment 1 makes is added in the centrifuge tube that 40mL ultrapure water is housed, continues sampling by certain time gradient, the water sample that is taken is measured in the ultraviolet-visible spectrophotometer, The wavelength was adjusted to 400nm, and the presence of persulfate in the solution was detected and released continuously over time.

[0046] Experiment proves that the persulfate gel slow-release agent that made still has persulfate group to release after 5 days, illustrates that this slow-release agent has good sustained-release effect, as image 3 shown.

Embodiment 3

[0048] The persulfate gel sustained-release agent prepared in Example 1 was injected into an ion exchange column with a length of 20 cm and an internal diameter of 4 cm in an amorphous form, and the flow rate of the peristaltic pump was set to 0.89 mL / min, and deionized water was continuously introduced ;Water enters from the bottom of the ion column, water exits from the top of the column, and is equipped with a three-way valve device that can control the sampling and sampling functions. At the set time point, sample 2mL from the water outlet to continuously detect the release of persulfate concentration .

[0049] Experiments have proved that the prepared potassium persulfate gel sustained-release material has a good sustained-release effect. Within 72 hours, the release concentration is above 150 mg / L, and the release curve is as follows: Figure 4 shown.

[0050] The persulfate gel sustained-release agent of the present invention solves the problems that organic pollutant...

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Abstract

The invention discloses a persulfate gel slow-release agent. A gelatin-silica sol composite gel system is used as a coating material, persulfate is used as an inner core, and the persulfate gel slow-release agent comprises the following components in percentage by mass: 20%-40% of alkaline silica sol, 1.25%-5% of an oxidizing agent, 2%-15% of gelatin, 0.2%-1% of a cross-linking agent and 0.1%-1%of an emulsifying agent, wherein the volume ratio of gelatin to alkaline silica sol is 1: (3-6). The invention also discloses a preparation method of the persulfate gel slow-release agent and application of the persulfate gel slow-release agent in degradation of organic pollutants in underground water. According to the invention, the low-viscosity liquid can be directly injected into the aquifer,and a gel state with a slow release function is gradually formed in the migration process of the aquifer, so that persulfate is continuously released to repair organic pollutants in underground water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a persulfate gel slow-release agent. [0002] The present invention also relates to a preparation method of the above-mentioned persulfate gel slow-release agent. [0003] The present invention also relates to the application of the above-mentioned persulfate gel slow-release agent in degrading organic pollutants in groundwater. Background technique [0004] With the continuous improvement of human development and utilization of groundwater, the pollution of groundwater has become more and more serious. Among them, benzene organic pollutants such as nitrobenzene have gradually become the key research objects. Because nitrobenzene is difficult to be biodegraded, it is easy to cause continuous migration and accumulation in natural media such as the atmosphere, water and soil. Therefore, the organic pollution of water caused by nitrobenzene will last for a long time in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/38C02F103/06
CPCC02F1/72C02F2101/38C02F2103/06
Inventor 杨昱姜永海席北斗徐祥健夏甫韩旭生贺万朔阳廉新颖贾永锋
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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