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Method for removing perchlorate in water

A perchlorate and water removal technology, applied in the field of water treatment, can solve the problems of high economic cost, low removal efficiency, and difficult removal, and achieve the effects of high adsorption efficiency, short reaction time, and strong practical value

Inactive Publication Date: 2012-04-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Because perchlorate is positive seven-valent (Cl) in water with high-valent chlorine 7+ ) in the form of long-lasting and stable existence in water, it is difficult to remove it by conventional water purification processes, and the removal technologies commonly used at home and abroad all have the disadvantages of low removal efficiency or high economic cost

Method used

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  • Method for removing perchlorate in water
  • Method for removing perchlorate in water

Examples

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Effect test

Embodiment 1

[0039] 1. Preparation of magnesium-aluminum layered double hydroxide:

[0040] (1) Weigh 192.3075g of magnesium nitrate hexahydrate and 93.7825g of aluminum nitrate nonahydrate, pour them into a 500mL conical flask, mix well and then add 150mL of deionized water to dissolve. If there are fine particles that cannot be dissolved, ultrasonication can be used for 3-5 minutes After stirring on an electromagnetic stirrer, the mixed solution that is completely dissolved after half an hour is called a;

[0041] Weigh 80.02g of anhydrous sodium hydroxide and 52.995g of anhydrous sodium carbonate respectively, pour them into another 500mL conical flask, quickly add 150mL of deionized water to dissolve them, if there are fine particles that cannot be dissolved, use ultrasonic After 3 to 5 minutes, electromagnetically stir evenly to obtain a completely dissolved solution b;

[0042] (2) Clean the two 150mL constant pressure funnels, dry them, and check their tightness. When ready, transf...

Embodiment 2

[0052] (1) The magnesium-aluminum bimetallic composite oxide Mg6Al that has reached saturation 2 o 9 Calcined at 550°C for 6h in a muffle furnace. Weigh 0.5g of regenerated adsorbent and put it into 200mL deionized water with an initial perchlorate concentration of 2000 μg / L (the mass ratio of adsorbent to polluted water is 1:400 respectively);

[0053] (2) Put it in a shaker at room temperature at 25°C with a rotation speed of 200rpm. After 12 hours, take 5mL of the mixed solution to pass through a 0.45μm filter membrane. The ion chromatography test shows that the removal rate can still reach more than 75% within 30 minutes, and the removal rate can reach 6 hours 85%, indicating that the adsorption functional material can be recycled.

Embodiment 3

[0055] (1) Weigh magnesium-aluminum bimetallic composite oxide Mg 6 Al 2 o 9 0.5g (the mass ratio of adsorbent to polluted water is 1:400), put into 200mL deionized in water;

[0056] (2) Put it in a shaker at room temperature at 25°C with a rotation speed of 200rpm. After reacting for 12 hours, the removal rates of perchlorate by the adsorbent are 29.84%, 69.79%, 86.33%, 89.32, and 87.68%, respectively. 60.54%.

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Abstract

The invention relates to a method for removing perchlorate in drinking water, which belongs to the technical field of water treatment and comprises the following steps that: (1) absorbing agents are added into polluted water containing ClO4<->; (2) the water is added into a stirring device or a shaker for carrying out absorption reaction; and (3) after the absorption is completed, the absorbing agents in the water is stopped for separation treatment. The roasted lamellar metallic oxides can be used for fast and efficiently removing perchlorate ions contained in tap water factory produced water and deionized water containing the perchlorate ions, so the water quality standard of the drinking water is reached, and in addition, the absorbed roasted lamellar compounds can be regenerated.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to a method for removing perchlorate in water. Background technique [0002] Low-concentration levels of perchlorate are almost everywhere in the environment. Domestic researchers have investigated surface water, groundwater, river sediment and nearby soil, drinking water, bottled water, and food (such as rice, milk, yogurt, etc.) Various levels of perchlorate contamination were detected in the Perchlorate is one of the environmental pollutants that has been focused on in the field of international water treatment in recent years. It has the toxicological characteristics of interfering with the absorption of iodine in the human body and inhibiting the ability of the thyroid gland to regulate hormone secretion and metabolism. Perchlorate detected in surface water, drinking water, soil and food has already constituted a hazard to the human living environment. [0003] The chemi...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/58
Inventor 杨一琼高乃云周超马艳郭洪光
Owner TONGJI UNIV
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