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Arsenic-removing material of nano ferrimanganic composite oxide and preparation method thereof

A composite oxide and nano-iron-manganese technology, which is applied in the field of water treatment, can solve the problems of easy oxidation of ferrous salt, uneasy control of operating conditions, and low yield of products, achieving excellent removal effect, simple and controllable preparation process, good effect

Inactive Publication Date: 2012-10-24
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the previous method [Qu Jiuhui et al., Preparation and evaluation of a novel Fe-Mn binary oxide adsorbent for effective arsenite removal, Water Research, 2007:41(9)], permanganate and ferrous salt were used to generate redox Reaction, co-precipitation method to prepare micron-sized iron-manganese oxides, but ferrous salts are prone to oxidation during the reaction process, the operating conditions are not easy to control, and the product yield is low

Method used

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  • Arsenic-removing material of nano ferrimanganic composite oxide and preparation method thereof
  • Arsenic-removing material of nano ferrimanganic composite oxide and preparation method thereof
  • Arsenic-removing material of nano ferrimanganic composite oxide and preparation method thereof

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Embodiment 1

[0030] An arsenic-removing material for nano-iron-manganese composite oxide, which is a nano-iron-manganese composite oxide containing iron, manganese and oxygen in an atomic ratio of 4:3:10, wherein manganese is +4, and iron is +3 valence, the BET specific surface area of ​​the arsenic removal material is 282 m 2 / g, the average particle size is 20 nm.

[0031] The arsenic-removing material of the above-mentioned nano-iron-manganese composite oxide, its preparation method comprises the following steps:

[0032] (1) Weigh 9.48 grams of KMnO 4 and 21.62 g FeCl 3 ·6H 2 O was respectively dissolved in 500ml deionized water, the above-mentioned ferric chloride solution was atomized into droplets and sprayed into the KMnO4 solution, and the pH value of the system was adjusted to 8 by using 1 mol / L sodium hydroxide to keep it stable;

[0033] (2) to be FeCl 3 ·6H 2 After the O solution is sprayed in, heat the above solution to 90°C on an electric furnace, and continue heating ...

Embodiment 2

[0041] A material for removing arsenic from nano-iron-manganese composite oxides, which is a nano-iron-manganese composite oxide containing iron, manganese and oxygen in an atomic ratio of 4:3:8, wherein manganese is +4, and iron is +3 valence, the BET specific surface area of ​​the arsenic removal material is 225 m 2 / g, with an average particle size of 10 nm.

[0042] The arsenic-removing material of the above-mentioned nano-iron-manganese composite oxide, its preparation method comprises the following steps:

[0043] (1) Weigh 11.76 grams of NaMnO 4 ·3H 2 O and 21.62 g FeCl 3 ·6H 2 O was dissolved in 500ml deionized water respectively, and the ferric chloride solution was atomized into droplets and sprayed into NaMnO 4 In the solution, the potassium hydroxide of 3mol / L is used to regulate the pH value of the system to be 10 and keep it stable;

[0044] (2) to be FeCl 3 ·6H 2 After the O solution is sprayed in, heat the above solution to 95°C on an electric furnace, an...

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Abstract

The invention relates to an arsenic-removing material of nano ferrimanganic composite oxide, which is the nano ferrimanganic composite oxide, wherein the atom ratio of iron to manganese to oxygen is 4:3:(8-10); the valence of the manganese is <+4> and the valence of the iron is <+3>; a BET specific surface area of the arsenic-removing material is 225-282 m<2> / g; and the average grain diameter is 10-20 nm. The nano ferrimanganic composite oxide prepared by the method disclosed by the invention has a larger specific surface area and a good adsorption capability; the removing speed of arsenic ina water body is fast and the effect is good; not only can the arsenic be adsorbed and the trivalence arsenic with the great toxin is converted into the pentavalence arsenic with the small toxin, but also the arsenic can be removed and the detoxication function is realized; and the nano ferrimanganic composite oxide can be used for a static adsorption manner and also can be filled into a filling column to remove the arsenic in a dynamic adsorption manner.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to an arsenic-removing material of nanometer iron-manganese composite oxide and a preparation method thereof. Background technique [0002] Nowadays, the arsenic content in water bodies in the natural state exceeds the safe drinking standard for human beings. China is one of the countries most seriously polluted by arsenic in the world. Arsenic is one of the most important indicators of drinking water pollution. The limit value of arsenic in my country's latest drinking water standard is 10 μg / L. (Fu Songbo, Chen Zhi, 2006). If humans drink water with excessive arsenic content for a long time, it will cause arsenic poisoning, which will lead to a variety of health problems, such as changes in skin color, hard skin on the soles of the feet and palms, and are prone to skin cancer, bladder cancer, lung cancer and kidney disease, as well as feet. And leg vascular disease, di...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F1/72C02F1/28C01G49/02B82Y40/00B82Y30/00B01J20/06B01J20/30
Inventor 孔淑琼余梅王焰新
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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