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Method for degrading organic pollutants in water body through activator composite material and activating persulfate

A technology for activating persulfate and organic pollutants, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of high energy consumption of advanced oxidation technology, low activation efficiency of persulfate, and narrow range of applicable water bodies, etc. The effect of wide application range and easy operation

Inactive Publication Date: 2014-11-05
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the technical problems existing in the prior art, such as the low activation efficiency of persulfate, the high energy consumption of the existing activated persulfate advanced oxidation technology, the low utilization rate of the oxidant, and the narrow range of applicable water bodies, the present invention provides an activator A method for activating persulfate with composite materials to degrade organic pollutants in water bodies. The method activates persulfate quickly, has high efficiency in degrading organic pollutants, and is applicable to a wide pH range of water bodies.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment utilizes the steps in the method for activating persulfate to degrade organic pollutants in water using an activator composite material of the present invention. Sodium persulfate and activator composite material of the present invention activate four kinds of degradation systems of sodium persulfate to degrade the degradation efficiency and total organic carbon (TCE) (a kind of volatile organic pollutant containing unsaturated bonds) in ground water TOC) removal rate:

[0039] A. Use sodium persulfate system alone:

[0040] Step 1, add 0.15mmolL to a 20mL borosilicate glass bottle with a screw cap -1 TCE groundwater and 4.5mmolL -1 Sodium persulfate, pH 7.2;

[0041] Step 2, directly place the borosilicate glass bottle in the vibrating bed, the rotation speed is 150rpm, the temperature is 25°C, and the reaction time is 30min. This is system 1.

[0042] B. Nano zero-valent iron activated sodium persulfate system:

[0043] Step 1, add 0.15mmolL to a ...

Embodiment 2

[0056] A kind of method of activator composite material activation persulfate degrading organic pollutant in the water body of the present embodiment is to compare the dye rhodamine B (RhB) (a kind of difficult volatile organic pollutant containing unsaturated bond) under different pH value conditions matter) degradation rate and TOC removal rate:

[0057] Step 1, measure 50mL0.02mmolL in the Erlenmeyer flask -1 Dye Rhodamine B (RhB) surface aqueous solution, add 0.40mmolL -1 After ammonium persulfate, in this example, HCl or NaOH is used to adjust the pH value of the RhB solution to 3.0, 5.0, 7.0, 9.0 and 10.0, which are respectively marked as system 1, 2, 3, 4 and 5;

[0058] Step 2, add 0.40mmolL to the five samples respectively while stirring -1 The activator composite material of the present invention, in this example, the activator composite material is that nanometer zero-valent iron is evenly distributed on the biochar surface; Wherein, nanometer zerovalent iron is a...

Embodiment 3

[0064] A kind of activator composite material activation persulfate of the present embodiment degrades the method for the organic pollutant in the water body, is to compare nitrobenzene (NB) (a kind of semi-volatile organic compound that contains unsaturated bond) under different potassium persulfate concentration conditions. Pollutants) degradation rate and TOC removal rate:

[0065] Step 1. Measure 50mL0.01mmolL in the Erlenmeyer flask -1 Nitrobenzene (NB) aqueous solution, add 0.20mmolL -1 , 1.00mmolL -1 , 2.00mmolL -1 After potassium persulfate, the pH is 6.4; respectively marked as system one, two and three;

[0066] Step 2, by activator composite material of the present invention and potassium persulfate mol ratio 1:1, add activator composite material of the present invention while stirring, in this example, activator composite material is that nanometer zero valent iron is evenly distributed in biological Carbon surface; wherein, the nanometer zero-valent iron is a ...

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Abstract

The invention discloses a method for degrading organic pollutants in a water body through an activator composite material and activating persulfate, belonging to the technical field of water pollution control. According to the method, the activator composite material comprises nano zero-valent iron and biochar; the activator composite material and persulfate react with the organic pollutants when being existent at the same time so as to degrade the organic pollutants in the water body. The method comprises the following concrete steps: 1, adding persulfate into the water body containing the organic pollutants, wherein the molar ratio of persulfate to the organic pollutants is (20 : 1) to (200 : 1); 2, adding the activator composite material while stirring, wherein the molar ratio of the activator composite material and persulfate is 1 : 1. The method has the advantages that generated free radicals are good in oxidation property, a reaction system is stable, the pH range is wide, the utilization rate of an oxidant is high, and the like; in addition, the method has wide application prospects on aspect of repairing the organic polluted water body.

Description

technical field [0001] The invention relates to the technical field of water pollution control, in particular to a method for activating persulfate with an activator composite material to degrade organic pollutants in water bodies. Background technique [0002] The rapid development of industry has led to increasingly serious water pollution problems, and organic pollution in water seriously threatens human health and ecological environment safety. How to quickly and effectively realize the treatment and restoration of organic polluted water has become an important task for environmental workers. Although hydrogen peroxide (H 2 o 2 ) as the oxidant advanced oxidation technology can achieve the rapid degradation of most organic matter in water, but in practical applications, H 2 o 2 Self-instability and the generated hydroxyl radicals (OH) have short lifespan in water bodies and cannot effectively degrade certain organic substances, such as perfluorocarboxylic acids. Ther...

Claims

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Application Information

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IPC IPC(8): C02F1/72
Inventor 晏井春陈梦舫钱林波高卫国韩璐
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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