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Preparation method of diatomite/magnesium ferrite composite material

A technology of composite materials and diatomite, applied in the field of materials, can solve the problems of low removal rate of heavy metal anions, low specific surface area, limited adsorption capacity, etc., and achieve the effect of solving subsequent pollution, large specific surface area and good adsorption effect

Active Publication Date: 2017-12-15
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, diatom raw soil has two deficiencies in the adsorption and treatment of heavy metal ions. One is that the specific surface area is low (25-30m 2 / g), the adsorption capacity is limited; the second is that the removal rate of heavy metal acid anions in water is low

Method used

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  • Preparation method of diatomite/magnesium ferrite composite material
  • Preparation method of diatomite/magnesium ferrite composite material
  • Preparation method of diatomite/magnesium ferrite composite material

Examples

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Effect test

Embodiment 1

[0041] This embodiment relates to a preparation method of a diatomite / magnesium ferrite composite material, comprising the following steps:

[0042] 1) Add 2.5g of diatomaceous earth to 30mL of ammonia water with a concentration of 25%, mix well

[0043] 2) Add 0.1 g of CTAB (cetyltrimethylammonium bromide) to the above suspension, and stir magnetically for 30 minutes at a temperature of 25°C;

[0044] 3) Weigh 1.5g MgCl 2 ·6H 2 O was added to a beaker filled with deionized water, stirred to dissolve it, then added 1.5g of ferrous oxalate powder and continued to stir to obtain a yellow suspension; Add it dropwise to the diatomaceous earth suspension at a high speed, and magnetically stir for 30 minutes at a temperature of 25°C to obtain a mixed solution;

[0045] 4) Transfer the mixed suspension to a reaction kettle, perform a hydrothermal reaction at 180°C for 8 hours for aging, cool to room temperature, wash with deionized water and absolute ethanol for 3 to 4 times, filt...

Embodiment 2

[0047] This embodiment relates to a preparation method of a diatomite / magnesium ferrite composite material, comprising the following steps:

[0048] 1) Add 2.5g of diatomaceous earth to 30mL of ammonia water with a concentration of 25%, mix well

[0049] 2) Add 0.1 g of CTAB (cetyltrimethylammonium bromide) to the above suspension and stir magnetically for 30 minutes at a temperature of 25°C;

[0050] 3) Weigh the MgCl of 2g amount 2 ·6H 2 O was added to a beaker filled with deionized water, stirred to dissolve it, then added 2g of ferrous oxalate powder and continued to stir to obtain a yellow suspension, and the above suspension was pumped with a constant flow pump at a speed of 50 drops / min Add it dropwise to the diatomite suspension, and stir magnetically for 30 minutes at a temperature of 25°C to obtain a mixed solution;

[0051] 4) Put the mixed solution in a reaction kettle, age at 180°C for 8 hours, cool to room temperature, then wash with deionized water and absolu...

Embodiment 3

[0053] This embodiment relates to a preparation method of a diatomite / magnesium ferrite composite material, comprising the following steps:

[0054] 1) Add 2.5g of diatomaceous earth to 30mL of ammonia water with a concentration of 25%, mix well

[0055] 2) Add 0.1 g of CTAB (cetyltrimethylammonium bromide) to the above suspension and stir magnetically for 30 minutes at a temperature of 25°C;

[0056] 3) Weigh the MgCl of 2g amount 2 ·6H 2 O was added to a beaker filled with deionized water, stirred to dissolve it, then added 1.5 g of ferrous oxalate powder and continued to stir to obtain a yellow suspension, and the above suspension was mixed with a constant flow pump at a rate of 50 drops / min. Add it dropwise to the diatomaceous earth suspension at a high speed, and magnetically stir for 30 minutes at a temperature of 25°C to obtain a mixed solution;

[0057] 4) Put the mixed solution in a reaction kettle, age at 180°C for 8 hours, cool to room temperature, then wash with...

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Abstract

The invention relates to a preparation method of a diatomite / magnesium ferrite composite material which can adsorb and degrade hexavalent chromium ions. The method comprises the following steps: 1) dissolving diatomite into ammonia water, and fully dipping the diatomite with the ammonia water by means of stirring so as to form diatomite suspension; 2) adding hexadecyl trimethyl ammonium bromide into the suspension to obtain a mixture and evenly stirring the mixture; 3) dropwise adding a solution containing magnesium chloride and ferrous oxalate into the evenly-stirred suspension slowly to obtain a mixed solution; 4) carrying out aging treatment on the mixed solution for 8 to 10 hours under a hydrothermal condition of 160 to 200 DEG C, cooling, washing, filtering and drying to obtain the diatomite / magnesium ferrite composite material. According to the method disclosed by the invention, magnesium ferrite with an ordered nanostructure is loaded on a diatomite algae disc, so that the limitation during application of a nanostructure material can be effectively solved, the adsorption efficacy of the diatomite also can be improved, and the catalytic reduction ability of the composite material is given to the hexavalent Cr at the same time.

Description

technical field [0001] The invention relates to the field of materials, in particular to a composite nanostructure material loaded with magnesium ferrite deposited on the surface of diatomite and a preparation method thereof. Background technique [0002] Chromium is recognized as one of the most toxic heavy metal pollutants. It can invade the human body for a long time through the digestive tract, respiratory tract, skin and mucous membranes, interfere with the activity of biological enzymes, cause mutagenesis, and cause great harm. Its pollution control has attracted much attention. Chromium often exists as chromate anion in water (such as: HCrO 4 - 、Cr 2 o 7 2- , CrO 4 2- etc.), it is very difficult to achieve standard treatment in industrial sewage. At present, the treatment methods of chromium-containing wastewater mainly include chemical reduction method, ion exchange method, adsorption method, etc. Among them, the adsorption method is simple and convenient, sui...

Claims

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Application Information

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IPC IPC(8): B01J20/14B01J20/30B01J23/745C02F1/28C02F1/70C02F101/22
CPCB01J20/04B01J20/14C02F1/288C02F1/70B01J23/78C02F2305/10C02F2101/22B01J35/39
Inventor 杜玉成王学凯祁超李扬吴俊书李强张丰
Owner BEIJING UNIV OF TECH
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