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Nickel titanium hydrotalcite and graphene composite photocatalyst responsive to visible lights and method for preparing same

A nickel-titanium hydrotalcite and graphene composite technology, applied in chemical instruments and methods, physical/chemical process catalysts, oxygen preparation, etc., can solve the problem of timely and effective separation of photogenerated electron holes, limited photocatalytic activity, and adsorption performance drop and other issues, to achieve the effect of easy mass production, large surface area, and long recycling life

Active Publication Date: 2013-02-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure nickel-titanium hydrotalcite is easy to agglomerate, which reduces its surface area and reduces its adsorption performance, and the photogenerated electron holes cannot be separated in time and effectively, which limits its photocatalytic activity.
So far, there is no report to improve its photocatalytic activity by means of doping, carrier support, etc.

Method used

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  • Nickel titanium hydrotalcite and graphene composite photocatalyst responsive to visible lights and method for preparing same
  • Nickel titanium hydrotalcite and graphene composite photocatalyst responsive to visible lights and method for preparing same
  • Nickel titanium hydrotalcite and graphene composite photocatalyst responsive to visible lights and method for preparing same

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Experimental program
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Effect test

Embodiment 1

[0018] 1. Under ice bath conditions, add 0.5g sodium nitrate to 23ml concentrated sulfuric acid, then add 0.5g graphite, stir well, add 3g potassium permanganate, mix well, then transfer to a water bath at 35°C for 2 hours, then put Adjust the temperature to 90°C for 30 minutes, add 100ml of deionized water and 3ml of 30wt% hydrogen peroxide to terminate the reaction, suction filter, wash, and dry to obtain graphite oxide;

[0019] 2. Put the graphite oxide into a muffle furnace at 1000°C and expand it for 5 minutes at high temperature, and the graphite oxide will be reduced to graphene;

[0020] 3. Ultrasonic disperse 5mg graphene in 50ml deionized water, ultrasonic power 200W, ultrasonic time 30min; then add 2.32g nickel nitrate, adjust the pH of the system to 4 with concentrated hydrochloric acid, stir for 30min; then add 250μl TiCl 4 solution (which contains 0.0023mol TiCl 4 ), stir and dissolve; finally add 5.0g urea, and react in a hydrothermal constant temperature syst...

Embodiment 2

[0024] 1. With embodiment 1;

[0025] 2. With embodiment 1;

[0026] 3. Ultrasonic disperse 10mg graphene in 50ml deionized water, ultrasonic power 100W, ultrasonic time 40min; then add 2.9g nickel nitrate, adjust the pH of the system to 4.5 with concentrated hydrochloric acid, stir for 40min; then add 250μl TiCl 4 Solution (containing 0.0023mol TiCl 4 ), stir and dissolve; finally add 6.0g urea, and react in a hydrothermal constant temperature system at 92°C for 24h; the product is centrifugally washed with deionized water until it is neutral, and after drying, it is a composite of nickel-titanium hydrotalcite and graphene that responds to visible light catalyst of light.

[0027] The above-mentioned nickel-titanium hydrotalcite and graphene composite photocatalyst responsive to visible light, wherein the mass of graphene is 1% of the mass of nickel-titanium hydrotalcite; the chemical formula of the nickel-titanium hydrotalcite is: [Ni 2+ 1-x Ti 4+ x (OH) 2 ] x+ ·(CO ...

Embodiment 3

[0030] 1. With embodiment 1;

[0031] 2. With embodiment 1;

[0032] 3. Ultrasonic disperse 15mg graphene in 100ml deionized water, ultrasonic power 100W, ultrasonic time 60min; then add 3.49g nickel nitrate, adjust the pH of the system to 5 with concentrated hydrochloric acid, stir for 60min; then add 250μl TiCl 4 Solution (containing 0.0023mol TiCl 4 ), stir and dissolve; finally add 8.0g urea, and react in a hydrothermal constant temperature system at 98°C for 24h; the product is centrifugally washed with deionized water until it is neutral, and after drying, it is a composite of nickel-titanium hydrotalcite and graphene that responds to visible light catalyst of light.

[0033] The above-mentioned nickel-titanium hydrotalcite and graphene composite photocatalyst responsive to visible light, wherein the mass of graphene is 1.5% of the mass of nickel-titanium hydrotalcite; the chemical formula of the nickel-titanium hydrotalcite is: [Ni 2+ 1-x Ti 4+ x (OH) 2 ] x+ ·(C...

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Abstract

The invention belongs to the field of oxygen preparation through photocatalysts by decomposing water with visible lights and discloses a nickel titanium hydrotalcite and graphene composite photocatalyst responsive to visible lights and a method for preparing the same. Grapheme serves as an electric transmission body template, the nickel titanium hydrotalcite and graphene composite photocatalyst of uniform partical sizes and good dispersibility is deposited on the surface, and large surface areas and more active centers are provided. A series of photocatalysts with superior performances and efficient water decomposition oxygen preparation effects under visible lights can be obtained by regulating composition ratios of metals of different valence states on hydrotalcite laminate and load amounts of carrier grapheme, and photocatalytic performances of the photocatalyst are superior to those of traditional WO3 photocatalysts.

Description

technical field [0001] The invention belongs to the field of photocatalysts for splitting water with visible light to produce oxygen, in particular to a composite photocatalyst of nickel-titanium hydrotalcite and graphene responsive to visible light and a preparation method thereof. Background technique [0002] In recent years, due to the global energy shortage, visible light-catalyzed production of hydrogen and oxygen, a green and non-toxic new clean energy production method, has attracted widespread attention of scientists. From the perspective of fully utilizing sunlight, it is of great practical significance to prepare a photocatalyst with photocatalytic activity under visible light. [0003] Currently developed photocatalysts for oxygen production mainly focus on TiO 2 , WO 3 However, due to its low activity and poor photocorrosion resistance, the application and development of catalytic materials are greatly limited. [0004] Hydrotalcite (Hydrotalcite) is a kind o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/232C01B13/02
Inventor 卫敏李蓓赵宇飞李长明刘军民段雪
Owner BEIJING UNIV OF CHEM TECH
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