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Preparation method and application of magnetic hydrotalcite/bismuth oxybromide compound

A magnetic hydrotalcite, bismuth oxybromide technology, applied in chemical instruments and methods, water pollutants, chemical/physical processes, etc., can solve the problems of long time required for catalysis, low recycling efficiency, and increased cost of catalyst application, Achieve fast electron hole separation efficiency and transfer speed, improve visible light catalytic activity, and good magnetic separation effect

Active Publication Date: 2019-11-15
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The patent application with the application number CN201811354137.1 discloses a preparation method and application of a magnetic hydrotalcite-supported titanium dioxide composite material. Titanium dioxide is used as a raw material, first undergoes co-precipitation reaction, and then undergoes hydrothermal crystallization treatment. The composite material obtained includes magnetic zinc-aluminum hydrotalcite and titanium dioxide. Titanium dioxide is loaded on the magnetic zinc-aluminum hydrotalcite, which has a large specific surface area and a large adsorption capacity. It has the advantages of good absorption of ultraviolet light, and is a nanocomposite material that removes toxic Cr(VI) in water through the method of adsorption and photocatalysis. Harmful to the human body. Secondly, the removal rate of Cr(VI) solution with a concentration exceeding 50mg / L is only 63.46%, and the time required for catalysis is long. Again, the recycling efficiency is low, which leads to an increase in the cost of catalyst application. Finally, the catalyst Without actual wastewater treatment, it does not have a wide range of practical application value

Method used

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  • Preparation method and application of magnetic hydrotalcite/bismuth oxybromide compound

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preparation example Construction

[0058] The invention provides a method for preparing a magnetic hydrotalcite / bismuth oxybromide composite, comprising the following steps:

[0059] S1, preparation of zinc-aluminum hydrotalcite

[0060] Zn(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O is dissolved in distilled water to form a salt solution, NaOH and Na 2 CO 3 Dissolving in distilled water to form an alkaline solution, adding the salt solution and the alkaline solution dropwise into a container filled with distilled water at the same time, stirring, standing, washing with distilled water until neutral, drying, and grinding to obtain zinc-aluminum hydrotalcite;

[0061] S2, preparation of magnetic zinc-aluminum hydrotalcite:

[0062] FeCl 3 ·6H 2 O was dissolved in ethylene glycol, and NaAC·3H was added 2 O, stir, add anhydrous ethylenediammonium, stir, finally add zinc-aluminum hydrotalcite, stir, seal the obtained solution in a polytetrafluoroethylene reaction device, heat at 180-250°C for 6-20h, take out...

Embodiment 1

[0078] Preparation of Magnetic Hydrotalcite / Bismuth Oxybromide Composite:

[0079] S1, preparation of zinc aluminum hydrotalcite (ZnAl-LDH)

[0080] 8.93g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) and 5.83g aluminum nitrate (Al(NO 3 ) 3 9H 2 O) dissolved in 100mL of distilled water to form a salt solution, 3.6g of sodium hydroxide (NaOH) and 2.82g of sodium carbonate (NaOH) 2 CO 3 ) is dissolved in 100mL of distilled water to form an alkaline solution, and simultaneously the salt solution and the alkaline solution are added dropwise to a three-necked flask filled with distilled water, the entire reaction temperature is controlled at 60°C and the rate of addition is controlled so that the pH value remains on 10, violently After stirring for 3 hours, leave it to age for 8 hours, wash with distilled water until neutral, dry in an oven at 60°C for 24 hours, grind it into powder after drying, and pass through a 100-mesh sieve to obtain zinc-aluminum hydrotalcite;

[0081] S2, prep...

Embodiment 2-5

[0089] Compared with Example 1, the preparation method of the magnetic hydrotalcite / bismuth oxybromide composite provided in Examples 2-5 is different in that in the S2 step: the zinc-aluminum hydrotalcite quality is 0.4, 0.6, 1.0 , 1.2g. Except for the above differences, other operations are basically the same and will not be repeated here.

[0090]

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Abstract

The invention provides a preparation method and an application of a magnetic hydrotalcite / bismuth oxybromide compound, and belongs to the field of inorganic photocatalysis. The compound comprises magnetic hydrotalcite and bismuth oxybromide. The preparation method comprises the following steps: synthesizing hydrotalcite by a coprecipitation technology, synthesizing magnetic hydrotalcite by a solvothermal technology, and finally synthesizing the magnetic hydrotalcite / bismuth oxybromide compound by the solvothermal technology and a calcining technology. The magnetic hydrotalcite / bismuth oxybromide compound of the invention overcomes the defects of bismuth oxybromide and magnetic zinc-aluminum hydrotalcite, has a high electron-hole separation efficiency and high transfer speed, reduces the recombination of electron hole pairs, improves the catalytic reduction activity of visible light to Cr(VI), has the advantages of low cost, convenience in preparation and easiness in separation, can bewidely used in photocatalytic reduction of heavy metal chromium in wastewater to achieve a catalytic effect of 98%, also has a magnetic separation effect, a good stability and a good recyclability, and also has a good catalytic reduction activity in actual wastewater treatment.

Description

technical field [0001] The invention relates to the field of inorganic photocatalysis, in particular to a preparation method and application of a magnetic hydrotalcite / bismuth oxybromide composite. Background technique [0002] Due to the carcinogenicity, mutagenicity and teratogenicity of chromium, Cr(VI) is designated as a priority pollutant. More and more people are paying attention to the technology of chromium treatment. In the process of industrial production, Cr(VI) is produced from a wide range of sources, such as leather manufacturing, electroplating, wood preservatives, dyes, paints and papers, etc. will produce Cr(VI) . [0003] So far, many conventional technologies have been applied to remove Cr(VI) from industrial wastewater, for example, membrane technology (such as reverse osmosis and ultrafiltration), electrocoagulation, ion exchange, adsorption, photocatalytic degradation, and biological treatment. Compared with other technologies, photocatalytic technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C02F1/30C02F1/70C02F101/22
CPCB01J27/06C02F1/30C02F1/70C02F2101/22B01J35/33B01J35/39
Inventor 李静闫良国闫涛孙蒙李旭光
Owner UNIV OF JINAN
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