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A kind of photochemically modified double metal hydroxide and its preparation method and application

A hydroxide, bimetallic technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the research on photochemical modification of the surface of bimetallic hydroxide photocatalysts. There is no report, etc. problem, to achieve the effect of quick and easy modification process, saving processing cost and mild reaction conditions

Active Publication Date: 2017-03-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current surface modification is mainly aimed at metal oxide semiconductors, and the modification process requires calcination. There is no report on the photochemical modification of the surface of double metal hydroxide photocatalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A. Weigh K 2 HPO 4 ·3H 2 O 1.3921g, KH 2 PO 4 0.5171g dissolved in 100mL deionized water, the molar concentration is 0.1mol / L, pH is 7;

[0019] B. 0.2g ZnTi-LDHs photocatalyst is added in the phosphate buffer solution described in step A, ultrasonic 20 minutes, ultrasonic power is 700W;

[0020] C. Under magnetic stirring, irradiate the ZnTi-LDHs dispersion liquid after ultrasonication in step B with a 300W xenon lamp light source for 1 hour, and the light intensity is 100mW / cm 2 ;

[0021] D. Centrifuge and wash the ZnTi-LDHs in step C with deionized water 5 times in a centrifuge (rotating speed is 4000rpm, time is 5min), and dry at 70°C for 12 hours to obtain ZnTi-LDHs surface-modified by phosphate catalyst.

[0022] The obtained ZnTi-LDHs photocatalyst was characterized by XPS, and the atomic percentage of P was measured to be 4.39%.

[0023] Performance evaluation: Prepare 30ml of methyl orange solution with a concentration of 10ppm and add it to a quartz b...

Embodiment 2

[0026] A. Weigh K 2 HPO 4 ·3H 2 O 2.7842g, KH 2 PO 4 1.0342g dissolved in 100mL deionized water, its molar concentration is 0.2mol / L, pH is 7;

[0027] B. 0.2g ZnTi-LDHs photocatalyst is added in the phosphate buffer solution described in step A, ultrasonic 30 minutes, ultrasonic power is 700W;

[0028] C. Under magnetic stirring, irradiate the ZnTi-LDHs dispersion liquid after ultrasonication in step B with a 300W xenon lamp light source for 1.5 hours, and the light intensity is 150mW / cm 2 ;

[0029]D. Centrifuge and wash the ZnTi-LDHs in step C with deionized water 5 times in a centrifuge (rotating speed is 4000rpm, time is 5min), and dry at 70°C for 12 hours to obtain ZnTi-LDHs surface-modified by phosphate catalyst.

[0030] The obtained ZnTi-LDHs photocatalyst was characterized by XPS, and the atomic percentage of P was measured to be 3.35%.

[0031] The method of Example 1 was used to evaluate the degradation performance of the methyl orange solution, and the de...

Embodiment 3

[0033] A. Weigh K 2 HPO 4 ·3H 2 O 6.9605g, KH 2 PO 4 2. Dissolve 5855g in 100mL deionized water with a molar concentration of 0.5mol / L and a pH of 7;

[0034] B. 0.2g ZnCr-LDHs photocatalyst is added in the phosphate buffer solution described in step A, ultrasonic 50 minutes, ultrasonic power is 600W;

[0035] C. Under magnetic stirring, irradiate the ZnCr-LDHs dispersion liquid after ultrasonication in step B with a 300W xenon lamp light source for 0.5 hours, and the light intensity is 120mW / cm 2 ;

[0036] D. Centrifuge and wash the ZnTi-LDHs in step C with deionized water for 5 times in a centrifuge (rotating speed is 4000rpm, time is 5min), and dry at 70°C for 12 hours to obtain ZnCr-LDHs surface-modified by phosphate catalyst.

[0037] The obtained ZnCr-LDHs photocatalyst was characterized by XPS, and the atomic percentage of P was measured to be 4.05%.

[0038] The method of Example 1 was used to evaluate the degradation performance of the methyl orange solution,...

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Abstract

The present invention provides a photochemically-modified double-metal hydroxide, a preparation method and applications thereof. The preparation method comprises: preparing a soluble phosphate into a phosphate buffer solution, adding double-metal hydroxide powder into the phosphate buffer solution, carrying out ultrasonic dispersing, and irradiating the dispersing solution with a light source having a continuous wavelength so as to modify the surface of the double-metal hydroxide with the phosphate to obtain the phosphate-modified double-metal hydroxide. According to the present invention, the method has characteristics of simple implementation process, no toxic and hazardous substance, mild reaction conditions, no requirement of heat treatment, energy saving and environmental protection; and the photochemically-modified double-metal hydroxide provides significantly-improved photocatalytic degradation efficiency on the dye in the water body than before, and can be used for photocatalytic degradation of the dye pollutant in the water body.

Description

technical field [0001] The invention belongs to the field of material surface modification, in particular to the photochemical modification of the surface of a double metal hydroxide, and the modified double metal hydroxide is used for photocatalytic degradation of dye pollutants in water bodies. Background technique [0002] With the rapid development of industry in modern society, waste gas and pollutants in waste water emitted during industrial production have become a major factor threatening human health and the earth's ecological environment. For example, the wastewater produced in synthetic paint, plastics, tanning, textile processes, etc. contains harmful substances such as aldehydes or phenols, and even daily drinking water will be affected by water transmission and distribution pipes, water storage containers, water supply equipment and materials containing urushiol, Dissolution pollution of protective materials such as epoxy (phenolic) resin coatings and linings. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/232C02F1/30
CPCY02W10/37
Inventor 项顼段雪何宛虹
Owner BEIJING UNIV OF CHEM TECH