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Method for adsorbing and degrading perchlorate in water

A perchlorate, adsorption and degradation technology, applied in the direction of adsorption of water/sewage treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of non-regeneration, easy desorption of modified materials, and no reports, etc., to achieve The effect of short adsorption time, good economic benefits and environmental benefits

Inactive Publication Date: 2012-06-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent CN 101481163A, Chinese patent CN 101481155A, and Chinese patent CN 101601992A all use hydrated iron oxide and surfactants and other substances to modify activated carbon to remove perchlorate in drinking water. There are modified materials that are easy to desorb and cannot be absorbed after reaching adsorption saturation. Insufficient regeneration
[0007] At present, there is no report on the method of using green rust to adsorb and degrade perchlorate in water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) All reagents are of analytical grade, and the experimental water is deoxygenated deionized water. The green rust preparation and adsorption degradation experiments were completed under anaerobic conditions or in an operation box filled with nitrogen.

[0036] (2) Weigh 1.3903g FeSO4 7H2O and 1g Fe 2 (SO 4 ) 3 In a 200mL beaker, add 50mL deoxygenated deionized water to make [Fe 2+ ] / [Fe 3+ ]=3, and poured into a three-necked flask purged with nitrogen, stirred vigorously on a magnetic stirrer to make it fully dissolved, configured 0.1mol / L NaOH solution, and transferred the lye to a constant pressure dropping funnel. The three bottle mouths are respectively connected to a constant pressure dropping funnel, a pH electrode and a nitrogen inlet, and the connections are tightly closed with rubber stoppers. Subsequently, the lye is added drop by drop, and the pH value of the solution is controlled at about 6.0 by controlling the flow rate of the lye. After the react...

Embodiment 2

[0041] Same as the steps (1) to (3) of Example 1.

[0042](4) Configure a series of 150ml solutions with an initial perchlorate concentration of 2000 μg / L and a pH value of 6, and add 3, 5, 10, 15, and 20ml of green rust solutions (green rust and The mass ratio of treated water is 1:50, 1:30, 1:15, 1:10, 1:8). Keep the temperature at 25°C and shake in a shaker at a speed of 160 rpm.

[0043] (5) After reacting for 6 hours, take 5 mL of the adsorption solution to filter through a 0.45 μm filter membrane. The removal rates of perchlorate by the patina solutions with dosages of 3, 5, 10, 15 and 20ml were 77.81%, 82.31%, 90.35%, 91.28% and 94.67%, respectively.

Embodiment 3

[0045] With embodiment 1 step (1)~(3).

[0046] (4) Configure series of 150ml of solutions with initial perchlorate concentration of 2000 μg / L and pH values ​​of 3, 4, 5, 6, 8, 10 and 12 respectively, and add 10ml of green rust solution (green The mass ratio of rust to water to be treated is 1:15). Keep the temperature at 25°C and oscillate at 160rpm in a shaker

[0047] (5) After reacting for 6 hours, take 5 mL of the adsorption solution to filter through a 0.45 μm filter membrane. The measured pH values ​​were 3, 4, 5, 6, 8, 10, 12, and the removal rates of green rust to perchlorate were 20.26%, 60.25%, 68.19%, 90.21%, 93.15%, 93.79% and 59.47%. This is because the oxidation-reduction potential of patina decreases and the reduction ability increases with the increase of pH value.

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Abstract

The invention belongs to the technical field of water treatment, and relates to a method for adsorbing and degrading perchlorate in water. The method comprises the following steps of: (1) adding an adsorbent into water to be treated; (2) adsorbing and degrading perchlorate in water with an adsorbent at a certain rotating speed and certain temperature; and (3) after adsorbing, intercepting, separating and treating the adsorbent in water. In the method, perchlorate in water is adsorbed and degraded by using patina, the effects of synchronous adsorption and degradation of perchlorate into harmless chlorine ions are represented, adsorption time is short, over 90 percent of perchlorate can be adsorbed within 6 hours, degradation rate is over 75 percent, and good economic benefit and environmental benefit are achieved.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to a method for adsorbing and degrading perchlorate in water. Background technique [0002] Perchlorate is an extremely stable inert ion in water. The oxidation number of chlorine is +7, which has a strong oxidizing ability, but the activation energy of the reaction is very high, so that it is very stable under most environmental conditions, and it is only high under concentrated strong acid conditions. Concentrated perchlorate has strong oxidizing properties, and low concentration of perchlorate has high chemical and electrochemical stability and cannot be reduced by general reducing agents. Because the charge and ionic radius of perchlorate is very close to that of iodide ion, it competes with iodide ion to enter the thyroid gland of the human body, thereby hindering the absorption of iodine, resulting in a decrease in the synthesis of thyroid hormones T3 and T4, and inhibiti...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F101/12
Inventor 杨一琼高乃云郭洪光马艳
Owner TONGJI UNIV
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