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

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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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1

[0035] (1) All reagents are of analytical grade, and the experimental water is deoxygenated and deionized water. The preparation of green rust and the adsorption and degradation experiments are all done in an operation box filled with anaerobic conditions or 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 pour it into a nitrogen-purged three-necked flask, stir vigorously on a magnetic stirrer to make it fully dissolved, prepare a 0.1mol / L NaOH solution, and transfer the lye to a constant pressure dropping funnel. The mouths of the three bottles are respectively connected to the constant pressure dropping funnel, the pH electrode and the nitrogen inlet, and the connections are closed with rubber stoppers. Subsequently, the lye was added dropwise, and the pH of the solution was controlled to be around 6.0 by controlling the flow rate of the lye. After t...

Example Embodiment

[0040] Example 2

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

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

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

Example Embodiment

[0044] Example 3

[0045] Same as steps (1) to (3) of Example 1.

[0046] (4) Configure a series of 150ml solutions each with an initial concentration of perchlorate of 2000μg / L and a pH value 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). Constant temperature at 25℃, as well as shaking at 160rpm in a shaker

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

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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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