Method for treating commercial iron powder by liquid oxygen at low temperature for enhancing pollutant reductive removal ability

A technology for low temperature treatment and pollutants, applied in the field of environmental chemistry, can solve the problems of low pollutant removal activity and poor reducing ability, and achieve the effects of easy acquisition, simple method and easy preparation

Active Publication Date: 2017-09-22
DONGGUAN PUREMATE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a simple, non-polluting liquid nitrogen low-temperature treatment method for commercial iron powder to enhance its ability to reduce and remove pollutants in view of the low activity of reducing and removing pollutants in commercial iron powder in the prior art
The inven

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  • Method for treating commercial iron powder by liquid oxygen at low temperature for enhancing pollutant reductive removal ability
  • Method for treating commercial iron powder by liquid oxygen at low temperature for enhancing pollutant reductive removal ability
  • Method for treating commercial iron powder by liquid oxygen at low temperature for enhancing pollutant reductive removal ability

Examples

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Example Embodiment

[0028] Example 1 Low-temperature liquid nitrogen treatment of iron powder with different particle sizes to treat hexavalent chromium in polluted water

[0029] Pour 1g of commercial iron powder with particle size of 100 mesh, 200 mesh, and 400 mesh into a Dewar flask containing 1.0L liquid nitrogen. The iron powder has been sinking to the bottom of the Dewar flask by gravity. After soaking for 10 minutes, the excess liquid Nitrogen is poured into a liquid nitrogen bottle for recycling. After the remaining liquid nitrogen is volatilized, the iron powder is poured out and dried at 50 degrees under the protection of nitrogen, which is liquid nitrogen treated commercial iron powder (LNFe). Use 20mL of potassium dichromate aqueous solution with hexavalent chromium concentration of 2mg / L to simulate chromium wastewater, add 0.1g of commercial iron powder (LNFe) treated with liquid nitrogen at low temperature, put it into a shaker with a rotation speed of 200rpm / min, take regular samplin...

Example Embodiment

[0030] Example 2 Low-temperature treatment of liquid nitrogen with 200 mesh iron powder to treat bromate in water

[0031] Put 2g of commercial iron powder with a particle size of 200 mesh into a Dewar flask containing 1.0L liquid nitrogen and soak for 20 minutes, then pour out the iron powder and dry it under the protection of nitrogen. Use 20 mL of 2 mg / L bromate aqueous solution to simulate bromate-containing wastewater, add 0.5 g of commercial iron powder (LNFe) treated with liquid nitrogen at low temperature, and put it into a shaker with a rotation speed of 200 rpm / min. Samples are taken regularly, and the concentration is measured by anion chromatography. At the same time, commercial iron powder (CFe) is used as a control test. The results are shown in Figure 4 . After 180 minutes of reaction, the bromate removal rate of commercial iron powder LNFe treated with liquid nitrogen at low temperature reached 100%, while the removal rate of commercial iron powder (CFe) was 13%....

Example Embodiment

[0032] Example 3 Low-temperature liquid nitrogen treatment of 100 mesh iron powder to treat uranyl ions in nuclear industry wastewater

[0033] Put 5g of commercial iron powder with a particle size of 100 mesh into a Dewar flask containing 1.0L liquid nitrogen and soak for 60 minutes, then pour out the iron powder and dry it under the protection of nitrogen. Use 20ml of 20mg / L uranyl aqueous solution to simulate nuclear industry wastewater, add 0.2g of commercial iron powder (LNFe) treated with liquid nitrogen at low temperature, put it into a shaker at 200rpm / min, take regular samples and measure the uranyl concentration, see the results Figure 5 . After 50 minutes of reaction, the removal rate of uranyl ions by commercial iron powder LNFe treated with liquid nitrogen at low temperature reached 100%, while the removal rate of commercial iron powder (CFe) was 35%.

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Abstract

The invention relates to a method for treating commercial iron powder by liquid oxygen at low temperature for enhancing pollutant reductive removal ability. Because the commercial iron powder is easily oxidized in the preparation and storage process, one layer of iron oxide with nanometer thickness covers the surface, and then the reduction ability is greatly decreased. The method aims at solving the problem of poor activity of the commercial iron powder by using the simple and easy method. The method comprises the following step of chilling the commercial iron powder, so as to obtain the commercial iron powder of which the pollutant reductive removal ability is enhanced. The oxide layer at the surface of the iron powder is cracked by the chilling step, and the active zero-valence ion at the interior (bottom layer) is exposed. Compared with other chemical or physical methods, the method for treating the commercial iron powder by the liquid nitrogen at low temperature has the characteristics that the method is simple, the implementing is easy, the efficiency is high, the pollution is avoided, the environment-friendly property is realized, the problem of low activity of pollutant in the existing commercial iron powder treatment process is solved, and the method is expected to be widely applied into the environment pollution control aspect.

Description

technical field [0001] The invention belongs to the field of environmental chemistry, specifically relates to the control and repair of high-valence toxic pollutants in water bodies, and is suitable for the treatment of waste water in the fields of printing and dyeing, industry, nuclear industry and the like. Background technique [0002] In today's 21st century, environmental pollution has always been a major problem faced by human beings all over the world. The economic development in the past few decades has been accompanied by the over-exploitation of natural resources and the random disposal of the three wastes, which have led to a series of environmental degradation problems. For example, the emergence of cancer villages, the increase of deformed children, the younger age of major diseases, and the deterioration of the living environment have forced people to pay attention to environmental issues that are closely related to themselves. In particular, the treatment of ...

Claims

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Application Information

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IPC IPC(8): C02F1/70B22F1/00G21F9/20C02F101/22C02F101/12C02F101/00
CPCG21F9/20C02F1/70C02F2101/006C02F2101/22C02F2101/12B22F1/142
Inventor 张礼知胡月贾法龙
Owner DONGGUAN PUREMATE ENVIRONMENTAL PROTECTION TECH CO LTD
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