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Titanium-dioxide-doped composite magnetic nano-grade adsorbent, preparation method thereof, and application thereof

A technology of titanium dioxide and adsorbent, which is applied in the field of water treatment and regeneration, can solve the difficult and difficult problems of catalyst recovery and reuse, and achieve the effects of easy separation, recovery and regeneration, consumption saving, and cheap and easy-to-obtain raw materials

Active Publication Date: 2012-10-17
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the fine particles of powdered nano-titanium dioxide, it is difficult to recover and reuse the catalyst after being dispersed in an aqueous solution, which brings considerable difficulties to practical applications.

Method used

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  • Titanium-dioxide-doped composite magnetic nano-grade adsorbent, preparation method thereof, and application thereof
  • Titanium-dioxide-doped composite magnetic nano-grade adsorbent, preparation method thereof, and application thereof
  • Titanium-dioxide-doped composite magnetic nano-grade adsorbent, preparation method thereof, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Accurately weigh 5.41g of FeCl 3 ·6H 2 O, 1.99 g FeCl 2 4H 2 O, 0.19 g TiCl 4 , dissolve in deionized water, add ammonia water while stirring, so that the pH of the solution is 8, black particles appear in the solution, continue to add deionized water, and set the volume to 200ml to obtain a mixed solution, and put the mixed solution in a water bath at 45°C Stir for 1 hour, put the mixture in an incubator at 70°C to age for 1 hour, then use a magnet to separate the black particles from the mixture, rinse with deionized water until the rinse solution does not detect Cl - ions, and filter with filter paper, dry the obtained black particles at 30°C for 24 hours, take them out and grind them into powder, and roast the black powder at 250°C in air for 2 hours to obtain the product.

Embodiment 2

[0040] Accurately weigh 5.41g of FeCl 3 ·6H 2 O, 1.99 g FeCl 2 4H 2 O, 0.95g TiCl 4 , was dissolved in deionized water, and ammonia water was added while stirring, so that the pH of the mixed solution was 9, black particles were produced in the mixed solution, and deionized water was continued to be added, and the volume was constant to 200ml to obtain a mixed solution. Stir the mixed solution in a 55°C water bath for 0.5h, put the mixed solution in a 50°C incubator to age for 0.5h, then use a magnet to separate the black particles from the solution, and rinse with deionized water until the rinse solution cannot be detected Cl - Ions, and filtered with filter paper, the obtained black particles were dried at 40°C for 24 hours, taken out and ground into powder, and the black powder was roasted in air at 250°C for 2 hours to obtain the product.

Embodiment 3

[0042] Accurately weigh 8.08g of Fe(NO 3 ) 3 9H 2 O, 11.52g of Fe(NO 3 ) 2 ·6H 2 O, 1.44g Ti (SO 4 ) 2 , dissolved in deionized water, adding sodium hydroxide while stirring, so that the pH of the mixed solution is 6, black particles are produced in the mixed solution, continue to add deionized water, and set the volume to 300ml to obtain a mixed solution, and put the mixed solution in Stir in a water bath at 25°C for 3 hours, then use a magnet to separate the black particles from the mixture, rinse with deionized water until the rinse solution does not detect Cl - ions, and filter with filter paper, dry the obtained black particles at 20°C for 48h, take them out and grind them into powder, roast the black powder at 200°C in pure nitrogen for 2h, and then roast at 200°C for 1h under air condition to obtain the product.

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Abstract

The invention relates to a titanium-dioxide-doped composite magnetic nano-grade adsorbent, a preparation method thereof, and an application thereof. The adsorbent comprises the raw materials of iron salt, ferrous salt, and titanium salt, wherein the mass ratio of the iron salt to the ferrous salt to the titanium salt is 2:(1-10):(0.01-0.6). The absorbent provided by the invention has good dispersity and adjustable doping amount. The absorbent has excellent photocatalytic activity of powdery nano-grade titanium dioxide. When ultraviolet light is adopted as a light source, and pollutants such as trivalent arsenic in water can be removed by oxidation without the addition of auxiliary agents. The adsorbent has relatively high magnetism. The absorbent with absorbed pollutants can be separated and recovered by using an external magnetic field method, and the recovery is easy. Therefore, the absorbent, the method and the application have good industrial application values.

Description

technical field [0001] The invention relates to a composite magnetic nano-adsorbent doped with titanium dioxide, a preparation method and application thereof, and belongs to the technical field of water treatment and regeneration applications. Background technique [0002] Arsenic is a carcinogenic and mutagenic factor, excessive arsenic in drinking water can lead to chronic poisoning. The maximum limit of arsenic in my country's latest revision of "Rural Drinking Water Hygienic Standard GB5749-2006" is 0.01mg / L, but in the "Drinking Water Hygienic Standard GB5749-85" the rural small-scale centralized water supply and decentralized water supply The previous regulation of 0.05mg / L is still used. [0003] At present, arsenic removal methods: adsorption method, coagulation method, direct precipitation method, ion exchange method, extraction method, reverse osmosis method, biological method, etc. The adsorption method has the advantages of high efficiency, economy, convenience,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F1/32C02F1/72C02F1/58
Inventor 彭先佳余莲栾兆坤
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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