Method for adsorbing and degrading perfluorinated compounds in water

A technology for activating products and water bodies, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve problems such as poor adsorption effect and unresolved PFCs treatment problems

Active Publication Date: 2016-02-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commercial activated carbon used in the current adsorption removal technology for PFCs has poor adsorption effect, and the problem of PFCs treatment after adsorption has not been solved.

Method used

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  • Method for adsorbing and degrading perfluorinated compounds in water
  • Method for adsorbing and degrading perfluorinated compounds in water
  • Method for adsorbing and degrading perfluorinated compounds in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The preparation steps of the reactivated activated carbon are as follows: 3 g of activated carbon is added to 20 mL of KOH solution, wherein the mass of KOH is 3 g. After two days of impregnation, the material was dried in an oven at 105°C for 8 hours. The dried material was placed in a tube furnace for activation. The activation procedure was as follows: first, the temperature was raised to 500 °C at a rate of 10 °C / min, and then to 1000 °C at a rate of 5 °C / min. Keep at 1000°C for 1.5h, then cool to room temperature naturally. During the activation process, N was passed through the tube furnace all the time 2 Protect. The activated material is repeatedly washed with high-purity water until the pH of the cleaning solution is less than 8, and the cleaned material is dried at 105°C.

[0050] The experimental procedure for the removal of PFCs in chrome-plating sewage is as follows: 10mg of reactivated activated carbon, commercial activated carbon, IRA67 ion exchange re...

Embodiment 2

[0058] The preparation steps of reactivated activated carbon are as follows: 3 g of commercial coconut shell activated carbon is added to 20 mL of potassium bicarbonate solution, wherein the mass of potassium bicarbonate is 4 g. After two days of impregnation, the material was dried in an oven at 105°C for 8 hours. The dried material was placed in a tube furnace for activation. The activation procedure was as follows: first, the temperature was raised to 500 °C at a rate of 10 °C / min, and then to 1000 °C at a rate of 5 °C / min. Keep at 1000°C for 1.5h, then cool to room temperature naturally. During the activation process, N was passed through the tube furnace all the time 2 Protect. The activated material is repeatedly washed with high-purity water until the pH of the cleaning solution is less than 8, and the cleaned material is dried at 105°C.

[0059] The experimental procedure for the removal effect of PFCs in chrome-plating sewage is as follows: add 10 mg of reactivated...

Embodiment 3

[0062] The preparation steps of reactivated activated carbon are as follows: add 3 g of commercial coconut shell activated carbon into 20 mL of KOH solution, wherein the mass of KOH is 4.5 g. After two days of impregnation, the material was dried in an oven at 105°C for 8 hours. The dried material was placed in a tube furnace for activation. The activation procedure was as follows: first, the temperature was raised to 500 °C at a rate of 10 °C / min, and then to 1000 °C at a rate of 5 °C / min. Keep at 1000°C for 1.5h, then cool to room temperature naturally. During the activation process, N was passed through the tube furnace all the time 2 Protect. The activated material is repeatedly washed with high-purity water until the pH of the cleaning solution is less than 8, and the cleaned material is dried at 105°C.

[0063] The experimental procedure for the removal effect of PFCs in chrome-plating sewage is as follows: add 10 mg of reactivated activated carbon to chrome-plating s...

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Abstract

The invention discloses a method for adsorbing and degrading PFCs. The method comprises the steps that a material capable of adsorbing the PFCs is utilized for adsorbing the PFCs in water, the water contains the PFCs, and a method for obtaining the material capable of adsorbing the PFCs comprises the steps that activated carbon is put in a potassium salt solution to be steeped for 1-3 days, the mass ratio of potassium salt to the activated carbon is 0.5 to 1.5, the potassium salt is selected from at least one of K2CO3 and KOH, high temperature activation is conducted on the steeped activated carbon to obtain an activated product, the temperature of high temperature activation ranges from 800 DEG C to 1000 DEG C, the high temperature activation time ranges from one hour to two hours, and the activated product is washed through high purity water; 2, the material which is obtained in the first step and is capable of adsorbing the PFCs is put in a persulfate solution so as to degrade the PFCs on the material capable of adsorbing the PFCs, and the persulfate solution is selected from at least one of ammonium persulfate, potassium persulfate and sodium persulfate. By means of the method, the material achieving effective regenerative adsorption of the PFCs can be obtained, the PFCs adsorbed by the material can be degraded, and innoxious treatment of the PFCs is achieved.

Description

technical field [0001] The present invention relates to the field of chemical materials. Specifically, the present invention relates to PFCs removal and degradation technology in water bodies. More specifically, the present invention relates to a method for adsorbing and degrading PFCs, a method for preparing materials for adsorbing PFCs, and a method for adsorbing PFCs Materials, use of materials for adsorbing PFCs in removing PFCs in water bodies and / or degrading PFCs in water bodies, a method for regenerating adsorbed PFCs materials, and a method for regenerating adsorbed PFCs materials and simultaneously degrading the PFCs adsorbed thereon. Background technique [0002] Perfluorinated compounds (PFCs), as a major class of persistent organic pollutants, have attracted worldwide attention, among which perfluorooctane sulfonic acid (PFOS) has been included in the list of banned chemicals under the Stockholm Convention as a persistent pollutant. [0003] my country is curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C01B31/08B01J20/32C02F101/14
Inventor 邓述波杜子文姚小龙余刚王斌黄俊王玉珏
Owner TSINGHUA UNIV
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