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Preparation method of TiO2/g-C3N4 composite photocatalyst and preparation method of hydrogen

A technology of g-c3n4 and composite light, applied in the field of chemistry, can solve the problems of limiting ZnO and low hydrogen efficiency, and achieve the effect of promoting fast separation, fast separation rate, and enhancing photocatalytic activity

Pending Publication Date: 2021-01-12
SHENZHEN TECH UNIV
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Problems solved by technology

However, due to the large band gap (3.7eV) of ZnO, ultraviolet light must be used to stimulate hydrogen production activity, but ultraviolet light only accounts for about 4% of sunlight, and due to its own too fast photogenerated current Sub-recombination rate also limits the application of ZnO in photocatalytic hydrogen production, resulting in low efficiency of hydrogen production

Method used

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  • Preparation method of TiO2/g-C3N4 composite photocatalyst and preparation method of hydrogen

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preparation example Construction

[0038] Specifically, the preparation method of graphite phase carbon nitride comprises the following steps:

[0039] Add tetrabutyl titanate into the acetic acid solution and stir, place the prepared solution in an autoclave and heat it in a high-temperature furnace to 120-160°C for 10-12 hours;

[0040] After the reaction is completed, the autoclave is naturally cooled to room temperature, the reaction product is obtained by centrifugation, the product is cleaned, and dried at 50-80° C. for at least 12 hours to obtain titanium dioxide.

[0041] Specifically, the preparation method of graphite phase carbon nitride comprises the following steps:

[0042] Mix and dissolve ammonium chloride and dicyandiamide according to the mass ratio of 3 to 7:1;

[0043] Heating the obtained solution at 80-120°C until a powdery substance is obtained;

[0044] The powdery material is sintered at 400-700° C. for at least 3 hours to obtain graphite phase carbon nitride.

[0045] Preferably, th...

Embodiment

[0051] 1. Preparation of TiO 2

[0052] Add 1ml of tetrabutyl titanate to 30ml of acetic acid to obtain solution A.

[0053] After the solution A was stirred vigorously for 10 minutes, the solution A was sealed in a Teflon autoclave with a volume of 50 ml, and the Teflon autoclave was placed in a high-temperature furnace, and the solution A was heated at 140° C. for 12 hours.

[0054] After the reaction was completed, the autoclave was naturally cooled to room temperature, and the reaction product B was obtained by centrifugation, and the reaction product B was carefully washed with water and absolute ethanol.

[0055] Dry the cleaned reactant B at 70 °C for 24 hours to obtain layered flower-like TiO 2 .

[0056] 2. Preparation of g-C 3 N 4 :

[0057] 10 g of ammonium chloride and 2 g of dicyandiamide were dissolved in 80 ml of deionized water and vigorously stirred for one hour to obtain solution C.

[0058] Solution C was dried at 100°C until substance D was obtained ...

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Abstract

The embodiment of the invention discloses a preparation method of a TiO2 / gC3N4 composite photocatalyst, and belongs to the field of chemistry. The preparation method comprises the following steps: dispersing graphite-phase carbon nitride and titanium dioxide in a solvent according to a mass ratio of (1-7):(9-3), and conducting heating to volatilize the solvent at 50-100 DEG C until a dry powdery mixture is obtained; and annealing the mixture for 1-3 hours at the heating speed of 1-8 DEG C / min under the condition of 200-550 DEG C to obtain the titanium dioxide / graphite phase carbon nitride composite photocatalyst. The catalyst can effectively promote rapid separation of photon-generated carriers on a junction interface, so that the photocatalytic activity of the catalyst is improved.

Description

technical field [0001] The embodiment of the present invention relates to the chemical field, especially a kind of TiO 2 / g -C 3 N 4 The preparation method of composite photocatalyst and the preparation method of hydrogen. Background technique [0002] With the development of the times and science and technology, energy has become a pivotal issue that affects the national development pattern, geopolitics, and environmental protection and ecology. As a representative of new energy, hydrogen energy represents the future development direction of new energy. [0003] In traditional methods, hydrogen can be obtained through electrolysis of water, dehydrogenation reaction or cracking. However, the disadvantage of this method is that these technologies need to be carried out under high temperature conditions or require high energy consumption, which cannot be applied on a large scale. Then another new method appeared, which is to split water through semiconductor photocatalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10C01B3/04
CPCB01J27/24C01B3/042C01B2203/0277B01J35/613B01J35/633B01J35/39Y02E60/36
Inventor 周双苏耀荣韩培刚
Owner SHENZHEN TECH UNIV
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