A biocl/al2o3 heterojunction material with photocatalytic activity and its preparation method

A photocatalytic activity, heterojunction technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of limited contact area, limited transfer speed of photogenerated carriers, etc. The preparation process is simple, it is beneficial to the transfer of electrons and catalytic activity, and the effect of broadening the application

Active Publication Date: 2019-03-05
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are currently two problems in constructing heterojunctions: one is to find heterojunction materials that are cheap and can match energy levels
At present, most heterostructures are built by synthesizing one semiconductor and then loading another semiconductor by precipitation, hydrothermal and other methods. The contact area between the two is limited, which limits the transfer speed of photogenerated carriers.

Method used

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  • A biocl/al2o3 heterojunction material with photocatalytic activity and its preparation method
  • A biocl/al2o3 heterojunction material with photocatalytic activity and its preparation method
  • A biocl/al2o3 heterojunction material with photocatalytic activity and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 Prepare pure BiOCl according to the following steps

[0020] ① Mix 0.005 mol of bismuth nitrate and 0.005 mol of diethylamine hydrochloride, heat to melt to form ionic liquid;

[0021] ② Heat the ionic liquid described in step ① in a tube furnace at a heating rate of 10 ℃ / min until the ionic liquid burns, and the combustion produces a large amount of smoke and releases a large amount of heat;

[0022] ③Collect the solid produced after the complete combustion in step ②, cool and grind to obtain powder.

[0023] The above powders were tested by XRD and UV-Vis DRS respectively, and the test patterns were as follows: figure 1 and figure 2 shown. figure 1 aXRD results show that the powder is pure BiOCl; figure 2 It can be seen from the figure that the pure BiOCl prepared in this example has absorption in the ultraviolet and visible light regions, and the absorption in the visible light region may come from the surface oxygen vacancies. SEM pictures such as...

Embodiment 2

[0025] Example 2 Prepare pure Al according to the following steps 2 o 3

[0026] ① Mix 0.010 mol aluminum nitrate and 0.010 mol diethylamine hydrochloride and heat until ionic liquid is formed;

[0027] ②Heat the above-mentioned ionic liquid in a resistance furnace at a heating rate of 50 ℃ / min until the ionic liquid burns, and the combustion produces a large amount of smoke and heat;

[0028] ③Collect the solid produced after the complete combustion in step ②, cool and grind to obtain a white powder.

[0029] Carry out XRD and UV-Vis DRS test to above-mentioned white powder, its pattern see respectively figure 1 and figure 2 . Depend on figure 1 a can see Al 2 o 3 There are no obvious characteristic peaks, in order to find Al 2 o 3 The crystalline phase, the enlarged Al 2 o 3 XRD as figure 1 As shown in b, there are mainly three diffraction peaks at 37.4°, 45.5° and 66.9°, corresponding to cubic γ-Al 2 o 3 (311), (400) and (440) diffractive phases of (JCPDS ...

Embodiment 3

[0031] Example 3 Prepare BiOCl / Al according to the following steps 2 o 3 Heterojunction

[0032] ① Mix and heat 0.002 mol bismuth nitrate, 0.010 mol aluminum nitrate and 0.010 mol diethylamine hydrochloride until ionic liquid is formed;

[0033] ②Heat in the tube furnace at a heating rate of 5 ℃ / min until the ionic liquid burns, and the combustion produces a lot of smoke and heat;

[0034] ③ Collect the solids produced after complete combustion, cool and grind to obtain BiOCl / Al 2 o 3 Heterojunction powder, the sample is named 0.4BA. Its XRD and UV-Vis DRS patterns refer to figure 1 a and figure 2 .

[0035] According to the method of Example 1, the visible light catalytic activity test was carried out, and the results showed that the degradation rate of phenol was 25.4% after irradiating for 240 min, as Figure 4 shown.

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Abstract

The invention discloses a BiOCl / Al2O3 heterojunction material with photocatalytic activity and a preparation method thereof. The BiOCl / Al2O3 heterojunction material is composed of BiOCl and Al2O3 in a mol ratio of (0.4-2.0): 1. The preparation method for the BiOCl / Al2O3 heterojunction material comprises the following steps: (1) mixing bismuth nitrate, aluminum nitrate and diethylamine hydrochloride according to a mol ratio of (0.2-1.0): 1: (1.0-3.5) and heating the obtained mixture to a melting state so as to obtain ionic liquid; (2) continuing heating the ionic liquid obtained in the step (1) until the ionic liquid combusts; and (3) collecting solid produced after complete combustion in the step (2) and carrying out cooling and grinding so as to obtain the BiOCl / Al2O3 heterojunction material. The preparation method provided by the invention is simple in process, free of complex equipment, short in preparation time, high in yield, low in cost and suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to a heterojunction material with photocatalytic activity, in particular to a BiOCl / Al material with photocatalytic activity 2 o 3 Heterojunction materials and methods for their preparation. Background technique [0002] With the development of the economy, the environmental pollution is becoming more and more serious, and the energy is being exhausted day by day. People are eager to seek a new clean energy. The pollution-free and inexhaustible characteristics of solar energy have attracted more and more attention. The nanophotocatalytic degradation of organic pollutants using sunlight has also attracted widespread attention. Photocatalytic technology not only has good prospects in the degradation of pollutants, but also has great applications in energy conversion, such as photolysis of water to produce hydrogen, photoreduction of CO 2 Wait. Among many photocatalysts, nano-TiO 2 Because of its high efficiency, non-toxic, goo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/125
CPCB01J27/125B01J35/004
Inventor 李发堂李义磊刘瑞红
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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