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Method for synthesizing anatase/brookite nano composite material for photocatalytic decomposition of water into hydrogen through one-step hydrothermal method

A nanocomposite material, a technology of photo-splitting water for hydrogen production, applied in nanotechnology for materials and surface science, hydrogen production, nanotechnology, etc., can solve the problem of high probability of photogenerated carrier recombination and few surface active sites , poor photocatalytic activity, etc., to achieve the effects of accelerating electron transfer, cheap raw materials, and simple operation

Inactive Publication Date: 2015-04-22
HEILONGJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to synthesize TiO 2 The structure of its own mixed crystal phase solves the problems of high photogenerated carrier recombination probability, few surface active sites and easy agglomeration of the existing prepared titanium dioxide photocatalytic materials, and provides a one-step hydrothermal Method for synthesizing anatase / brookite nanocomposites for photolysis of water to produce hydrogen

Method used

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  • Method for synthesizing anatase/brookite nano composite material for photocatalytic decomposition of water into hydrogen through one-step hydrothermal method
  • Method for synthesizing anatase/brookite nano composite material for photocatalytic decomposition of water into hydrogen through one-step hydrothermal method
  • Method for synthesizing anatase/brookite nano composite material for photocatalytic decomposition of water into hydrogen through one-step hydrothermal method

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specific Embodiment approach 1

[0020] Embodiment 1: A method for synthesizing anatase / brookite nanocomposite materials for photolysis of water to produce hydrogen by a one-step hydrothermal method in this embodiment, specifically operates according to the following steps:

[0021] 1. Add the alkali solution and the titanium source to the water solvent under stirring conditions, and continue stirring for 30 minutes to obtain the precursor;

[0022] Among them, the mass volume ratio of titanium source and water solvent is 1g:(15-30)mL, and the volume ratio of alkali and titanium source is 1:(0.4-3.4);

[0023] 2. Transfer the precursor obtained in step 1 to a hydrothermal kettle, and place it in a blast drying oven for hydrothermal reaction at a temperature of 120-160°C and a reaction time of 10-24 hours;

[0024] 3. Wash the product after the hydrothermal reaction in step 2, and then ultrasonically disperse it in absolute ethanol; repeatedly wash and ultrasonically disperse 2 times to obtain the product; whe...

specific Embodiment approach 2

[0028] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the feature described in step 1 is that the alkali is a mixed solution of one or more of hydrazine hydrate, ammonia water, cyanamide or hydroxylamine. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0029] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the source of titanium in step one is or titanium oxysulfate, tetrabutyl titanate, titanium tetrachloride, titanium isopropoxide, titanium sulfide, One or more mixtures of titanium tetrafluoride mixed in any ratio. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for synthesizing an anatase / brookite nano composite material for photocatalytic decomposition of water into hydrogen through a one-step hydrothermal method, and relates to a preparation method for an anatase / brookite nano composite material for photocatalytic decomposition of water into hydrogen. The method is used for solving the difficulties in heterojunction of different crystalline phases of TiO2 and the problems that the recombination probability of a TiO2 photocatalytic material photon-generated carrier is high, the surface active sites are fewer, and the photocatalytic activity is poor as agglomeration is easily generated. The method comprises the following steps: selecting and adding different alkaline solutions and different titanium sources into a water solvent to obtain a mixture, putting the mixture into a hydrothermal kettle to react; then, washing, drying the washed product to obtain the product. Compared with the prior art, the method disclosed by the invention is simple, low in cost and can be used for large-scale synthesis. The prepared anatase / brookite nano composite material forms crystalline phase heterojunction, so that electronic transmission is quickened, the specific surface area is remarkably increased, and the performance of producing water through photocatalytic decomposition under ultraviolet light is good.

Description

technical field [0001] The invention relates to a kind of TiO synthesized by one-step hydrothermal method 2 Mixed phase (anatase / brookite) nanocomposites approach. Background technique [0002] At present, in the face of the increasing global demand for energy and the serious environmental crisis, people are paying more and more attention to research on finding new energy sources to replace fossil energy sources. Hydrogen energy is a very good green energy. As a secondary energy source, it has many advantages such as cleanness, high efficiency, safety, storability, and transportability, so it has been highly valued by various countries. However, the current method of hydrogen production is mainly industrial hydrogen production, usually using unenvironmentally friendly and economical methods such as the steam reforming process of natural gas. The photo-splitting water technology was first reported and discovered by two professors, Fujishama and Honda, from the University of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C01B3/04B82Y30/00
CPCY02E60/36
Inventor 付宏刚郝蓉蒋保江李明霞郭世恩栾玉婷
Owner HEILONGJIANG UNIV
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