Filter medium for removing hexavalent chromium from drinking water and preparation method thereof

A filter medium and hexavalent chromium technology, which is applied in the field of water treatment, can solve the problems of low removal rate, etc., and achieve the effect of good adsorption capacity and easy use.

Inactive Publication Date: 2010-09-29
QIDI ELECTRIC GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Considering that the filtration method in the prior art has a low removal rate when removing hexavalent chromium in drinking water, it is necessary to provide a filter medium with a higher removal rate for hexavalent chromium in drinking water

Method used

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  • Filter medium for removing hexavalent chromium from drinking water and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Take ultra-high molecular weight polyethylene powder 275g, this ultra-high molecular weight polyethylene is the M-II type product of the Second Auxiliary Factory of Beijing Dongfang Petrochemical Co., Ltd., and the weight-average molecular weight is 2,500,000;

[0031] (2) Weigh 75g of medical activated carbon powder, the particle size of the medical activated carbon powder is 94μm~115μm, and the specific surface area is greater than 1400m 2 / g;

[0032] (3) Weighing 90g of magnesium hydroxide powder, the particle size of the magnesium hydroxide powder is 65 μm to 85 μm, and the purity is greater than 99.99% by weight;

[0033] (4) Stir the natural bentonite with water to make a slurry, add oxalic acid to the slurry to control the pH value of the slurry at about 6.5, stir for 10 hours, then filter the slurry, dry, and pulverize to obtain a particle size of 55 μm to 75 μm The modified bentonite powder, take this modified bentonite powder 75g;

[0034] (5) Take food...

Embodiment 2

[0039] (1) Take ultra-high molecular weight polyethylene powder 290g, this ultra-high molecular weight polyethylene is the M-II type product of the Second Auxiliary Factory of Beijing Dongfang Petrochemical Co., Ltd., and the weight average molecular weight is 2.5 million;

[0040] (2) Weigh 70g of medical activated carbon powder, the particle size of the medical activated carbon powder is 94μm~115μm microns, and the specific surface area is greater than 1400m 2 / g;

[0041] (3) Weighing 85g of magnesium hydroxide powder, the particle size of the magnesium hydroxide powder is 65 μm to 85 μm, and the purity is greater than 99.99% by weight;

[0042] (4) take by weighing the modified bentonite powder 75g prepared in the (4) step of embodiment 1;

[0043] (5) Take by weighing food-grade ammonium bicarbonate 110g, the purity of described food-grade ammonium bicarbonate is greater than 99.99%;

[0044] (6) Put the above five powders into a mechanical stirrer and stir for 10 minut...

Embodiment 3

[0048] (1) Take ultra-high molecular weight polyethylene powder 260g, this ultra-high molecular weight polyethylene is the M-II type product of Beijing Dongfang Petrochemical Co., Ltd. Auxiliary No. 2 Factory, and the weight-average molecular weight is 2,500,000;

[0049] (2) Weigh 90g of medical activated carbon powder, the particle size of the medical activated carbon powder is 94μm~115μm, and the specific surface area is greater than 1400m 2 / g;

[0050] (3) Weighing 100 g of magnesium hydroxide powder, the particle size of the magnesium hydroxide powder is 65 μm to 85 μm, and the purity is greater than 99.99% by weight;

[0051] (4) Stir the natural bentonite with water to make a slurry, add sodium hydroxide to the slurry to control the pH value of the slurry at about 7.5, stir for 10 hours, then filter the slurry, dry, and pulverize to obtain a particle size of 55 μm ~75 μm modified bentonite powder, weigh 68g of the modified bentonite powder;

[0052] (5) Take by weigh...

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Abstract

The invention discloses a method for preparing a filter medium for removing hexavalent chromium from water, which comprises the following steps of: a) mixing raw materials, namely ultra-high molecular weight polyethylene powder, powdered activated carbon, magnesium hydroxide powder, bentonite powder and a foaming agent in a weight ratio of 200-300:50-200:50-200:50-120; and b) pressing the mixture obtained by the step a) in a mold, sintering and cooling. Compared with the prior art, the filter medium has the advantages that: the prepared filter medium can efficiently and quickly remove the hexavalent chromium from drinking water; in addition, the filter medium is simple and convenient to use and is suitable for treating drinking water at a home terminal; and detection results show that the filter medium prepared by the method has the removal rate of 95 to 99 percent for the hexavalent chromium in the drinking water.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a filter medium for removing hexavalent chromium in drinking water and a preparation method thereof. Background technique [0002] Chromium is an essential trace element for the human body. A lack of chromium in the human body can cause atherosclerosis and affect the metabolism of carbohydrates and lipids in the body. However, if too much chromium pollutes the water body, chromium can accumulate in aquatic organisms, fish, and plants, so it is more harmful to humans, animals, and plants. Many studies have shown that after chromium penetrates into cells in the form of hexavalent chromium, it is reduced to trivalent chromium which is more toxic and easy to absorb, and then trivalent chromium combines with intracellular macromolecules, which can easily cause cell mutation and canceration. Chromium is a strong carcinogenic mutant has been confirmed. [0003] In the United States, Jap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/14B01J20/20C02F1/28C02F1/62
Inventor 周奇迪
Owner QIDI ELECTRIC GROUP
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