Mixed-phase mesoporous titanium dioxide and preparation method thereof, and treatment method for removing arsenic-containing organic pollutants under photocatalysis of mixed-phase mesoporous titanium dioxide

A technology of mesoporous titanium dioxide and organic pollutants, applied in the field of water treatment, can solve problems such as ambiguous DMA mechanism, achieve the effects of improving photocatalytic activity, efficient oxidation degradation, and simple installation method

Inactive Publication Date: 2018-04-27
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

In addition, the mechanism of TiO photocatalytic degradation of DMA is still unclear

Method used

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  • Mixed-phase mesoporous titanium dioxide and preparation method thereof, and treatment method for removing arsenic-containing organic pollutants under photocatalysis of mixed-phase mesoporous titanium dioxide
  • Mixed-phase mesoporous titanium dioxide and preparation method thereof, and treatment method for removing arsenic-containing organic pollutants under photocatalysis of mixed-phase mesoporous titanium dioxide
  • Mixed-phase mesoporous titanium dioxide and preparation method thereof, and treatment method for removing arsenic-containing organic pollutants under photocatalysis of mixed-phase mesoporous titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068]This example provides a miscible mesoporous titanium dioxide, the preparation method of which is the solvent evaporation-induced self-assembly method, the steps are: using P123 as a template agent, dissolving it in an appropriate amount of ethanol, and adding 1.4 g of concentrated Hydrochloric acid and 0.46g of sulfuric acid were stirred at room temperature for 3h. Add 3 g of isopropyl titanate TIPO to the mixture, and stir for 20 h to ensure that TIPO is fully hydrolyzed and polymerized. Then the solution was dried in a vacuum oven at 40° C. and 100° C. for two days respectively. The obtained sample was fired in a nitrogen atmosphere in a tube furnace for 3 hours, and then fired in a muffle furnace at 450° C. for 6 hours, and the finally obtained sample was miscible mesoporous titanium dioxide.

[0069] Characterization of mesoporous titania: Through a series of characterizations of the mesoporous titania obtained in Example 1 and the P25 material in Comparative Exampl...

Embodiment 2

[0076] During the experiment, an appropriate amount of mesoporous titanium dioxide was added to 100ml of DMA solution with an initial concentration of 200μg / L, the solution was first placed on a magnetic stirrer, and adsorbed for 1h under dark conditions, and then the solution was transferred to a photocatalytic In the reactor, the photocatalytic reaction was carried out under the irradiation of xenon lamp. Under the same experimental conditions, the mesoporous titanium dioxide was replaced with the same dosage of commercial P25, and a comparative experiment was carried out. By measuring the total arsenic concentration in the solution during the reaction, the effects of photocatalytic degradation of DMA by mesoporous titania and P25 were compared. The change curve of arsenic concentration with time is shown in Figure 5 , the results show that under the same conditions, the adsorption capacity of mesoporous titanium dioxide to DMA is about 43% higher than that of P25 in Compa...

Embodiment 3

[0078] During the experiment, different amounts of mesoporous titanium dioxide were added to 100 ml of DMA solution with an initial concentration of 200 μg / L, the solution was first placed on a magnetic stirrer, and adsorbed for 1 h under dark conditions, and then the solution was transferred to In the photocatalytic reactor, the photocatalytic reaction is carried out under the irradiation of xenon lamp. The optimal dosage of mesoporous titania was determined by measuring the change of arsenic concentration in the process of photocatalytic degradation of DMA under different dosages of mesoporous titania. The results show that the photocatalytic effect is the best when the dosage of mesoporous titanium dioxide is 0.8g / L-1g / L.

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Abstract

The invention discloses mixed-phase mesoporous titanium dioxide and a preparation method thereof, and a treatment method for removing arsenic-containing organic pollutants under the photocatalysis ofthe mixed-phase mesoporous titanium dioxide. The mixed-phase mesoporous titanium dioxide is of a mixed-phase crystal form of anatase and rutile, has pores with sizes of 3 to 25 nm, and contains oxygenvacancies. The treatment method comprises the following steps: 1) dissolving a template in a solvent, adding hydrochloric acid and sulfuric acid, and then carrying out stirring; 2) adding titanate and carrying out stirring for a hydrolytic polymerization reaction; and 3) carrying out drying and then carrying out roasting in a protective atmosphere so as to obtain mixed-phase mesoporous titanium dioxide, wherein a mass ratio of hydrochloric acid to sulfuric acid to titanate is 140: 46: 300. With the mixed-phase mesoporous titanium dioxide, high-efficiency photocatalytic degradation of low-concentration DMA is realized, and the removal rate of DMA is 95% or above. The invention also reveals the optimal feeding amount of mesoporous titanium dioxide and an optimal pH value for photocatalyticdegradation of DMA via the mixed-phase mesoporous titanium dioxide, and two catalytic degradation routes for removal of DMA in water through photocatalysis are disclosed.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a miscible mesoporous titanium dioxide, its preparation method and application, in particular to a miscible mesoporous titanium dioxide, its preparation method and a treatment method for using the titanium dioxide to photocatalyze the removal of arsenic-containing organic pollutants. Background technique [0002] Drinking water is an important route of arsenic exposure. According to reports, arsenic mainly exists in the form of inorganic arsenic in water, namely, pentavalent arsenic As(V) and trivalent arsenic As(III). However, the presence of arsenic-containing organic pollutants cannot be ignored. Many cities have detected organic arsenic in surface water and groundwater, mainly monomethylarsenic (MMA) and dimethylarsenic (dimethylarsine, DMA). The range was 3.5 μg / L to 233.9 μg / L. The results of water quality testing in some areas show that the content of dimethyl arsen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047C01G23/053B01J21/06C02F1/30C02F1/72C02F101/30
CPCB01J21/063B01J35/004C01G23/047C01G23/053C01P2002/72C01P2002/84C01P2002/85C01P2006/12C01P2006/16C02F1/30C02F1/725C02F2101/30C02F2209/06C02F2305/023C02F2305/10
Inventor 胡承志董晶晶曲久辉刘会娟安晓强齐维晓
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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