A kind of preparation method of porous silver-titanium composite catalyst

A composite catalyst and porous silver technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of easy separation, insufficient combination, and insufficient degradation Efficiency and other issues, to achieve the effect of promoting adsorption, exerting mutual synergy, and good catalytic effect

Active Publication Date: 2014-10-29
江阴智产汇知识产权运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional composite method is to use a certain substance as a matrix (for example: diatomaceous earth as a matrix), and then load another substance on this matrix through physical contact (for example: load TiO 2 ), the combination of the two substances is not tight enough, they are easy to separate, and the degradation efficiency cannot be fully exerted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh a certain mass of silver nitrate, titanium tetranitrate and urea to make a solution, so that Ag + 、Ti 4+ , The molar ratio of urea is 2:1:10, the configured Ag + 、Ti 4+ The total ion concentration was 6mol / L, and then the prepared solutions were poured into the hydrothermal kettle, and the hydrothermal kettle was placed in an oven at 130°C for crystallization for 36 h. Cool to room temperature, filter and wash until neutral to obtain silver-titanium hydrotalcite; add the obtained silver-titanium hydrotalcite to water to form a suspension with a solid-to-liquid ratio of 1:50, and add 2 mmol of anion per gram of hydrotalcite Surfactant: sodium dodecylsulfonate, stirred for 3 h; 60 mmol of aminopropyltriethoxysilane was dissolved in 50 ml of absolute ethanol, and then added dropwise to the above hydrotalcite suspension; dropwise added After completion, continue stirring for 3 hours, separate solid and liquid, wash 3 times, and dry at 105° C.; roast the obtained so...

Embodiment 2

[0018] Weigh a certain mass of silver nitrate, titanium tetranitrate and urea to make a solution, so that Ag + 、Ti 4+ , The molar ratio of urea is 4:1:10, the configured Ag + 、Ti 4+ The total ion concentration was 4mol / L, and then the prepared solutions were poured into hydrothermal kettles, and the hydrothermal kettles were placed in an oven at 120°C for crystallization for 24 h. Cool to room temperature, filter and wash until neutral to obtain silver-titanium hydrotalcite; add the obtained silver-titanium hydrotalcite into water to form a suspension with a solid-to-liquid ratio of 1:30, and add 1 mmol of anion per gram of hydrotalcite Surfactant: sodium dodecylbenzenesulfonate, stirred for 2 h; 30 mmol of aminopropyltriethoxysilane was dissolved in 50 ml of absolute ethanol, and then added dropwise to the above hydrotalcite suspension; dropwise After the addition, continue to stir for 2 h, separate the solid from the liquid, wash twice, and dry at 90 °C; the obtained soli...

Embodiment 3

[0021] Weigh a certain mass of silver nitrate, titanium tetranitrate and urea to make a solution, so that Ag + 、Ti 4+ , The molar ratio of urea is 3:1:10, the configured Ag + 、Ti 4+ The total ion concentration was 5mol / L, and then the prepared solutions were poured into the hydrothermal kettle, and the hydrothermal kettle was placed in an oven at 125°C for crystallization for 30 h. Cool to room temperature, filter and wash until neutral to obtain silver-titanium hydrotalcite; add the obtained silver-titanium hydrotalcite to water to form a suspension with a solid-to-liquid ratio of 1:40, and add 1.5 mmol of anion per gram of hydrotalcite Surfactant: sodium hexadecylsulfonate, stirred for 2 h; 50 mmol of aminopropyltriethoxysilane was dissolved in 50 ml of absolute ethanol, and then added dropwise to the above hydrotalcite suspension; dropwise added After completion, continue stirring for 3 hours, separate solid from liquid, wash 3 times, and dry at 100° C.; roast the obtain...

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Abstract

The present invention discloses a porous silver-titanium composite catalyst preparation method, and belongs to the field of sewage treatment. The preparation method comprises: weighing silver nitrate, titanium tetranitrate and urea, and preparing into a solution, wherein a molar ratio of Ag<+> to Ti<4+> to urea is 2:1:10-4:1:10, and the total concentration of Ag<+> ions and Ti<4+> ions is 4-6 mol / L; carrying out crystallization on the prepared solution for 24-36 h at a temperature of 120-130 DEG C to obtain silver-titanium type hydrotalcite; adding the hydrotalcite to water to prepare a suspension liquid with a solid-liquid ratio of 1:30-1:50, adding an anion surfactant, and stirring for 2-3 h, wherein per g of the hydrotalcite is added with 1-2 mmol of the anion surfactant; and dissolving 30-60 mmol of aminopropyltriethoxysilane in 50 ml of absolute ethanol, adding the obtained solution to the hydrotalcite suspension liquid in a dropwise manner, carrying out solid-liquid separation, drying at a temperature of 90-105 DEG C, and carrying out calcination at a temperature of 450-550 DEG C to prepare the porous silver-titanium composite catalyst with characteristics of large specific surface area, absorption promotion, and good catalysis effect.

Description

technical field [0001] The invention relates to a preparation method of a porous silver-titanium composite catalyst, belonging to the technical field of sewage treatment in environmental protection. Background technique [0002] Traditional water treatment methods have problems such as low efficiency, high cost, and secondary pollution, and sewage treatment has not been well resolved. The development and application of nanotechnology is likely to completely solve this problem. TiO was discovered in 1972 2 High oxidation activity, good chemical stability, non-toxic to the human body, low cost, no pollution, wide application range, so it is the most important, but TiO 2 The bandgap width is large (such as anatase TiO 2 The forbidden band width Eg=3.2 eV), can only absorb light in the ultraviolet region (wavelength less than 387 nm), and has low utilization efficiency of solar energy. [0003] As an important part of nanomaterials, nano-noble metals have broad application p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J35/10
Inventor 马建锋李良银李定龙杨彦
Owner 江阴智产汇知识产权运营有限公司
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