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A ternary high-efficiency composite visible light photocatalytic material and its preparation method

A technology of visible light and photocatalysis, which is applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., to achieve strong hole capacity, improve separation efficiency and photocatalytic efficiency, and prepare The effect of simple method

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

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Problems solved by technology

[0005] The purpose of this invention is to provide a kind of N-K 2 Ti 4 o 9 / g -C 3 N 4 / UiO-66 ternary high-efficiency composite visible light photocatalyst and its preparation method, to overcome the defects of single catalytic material and promote the separation of photogenerated charges through composite, the preparation method is simple, and the photocatalytic effect of degrading rhodamine B is remarkable

Method used

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  • A ternary high-efficiency composite visible light photocatalytic material and its preparation method
  • A ternary high-efficiency composite visible light photocatalytic material and its preparation method
  • A ternary high-efficiency composite visible light photocatalytic material and its preparation method

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Embodiment 1

[0027] The present embodiment prepares N-K according to the following steps 2 Ti 4 o 9 / g -C 3 N 4 / UiO-66 ternary high-efficiency composite visible light photocatalyst:

[0028] 1. N-K 2 Ti 4 o 9 preparation of

[0029] 6.6g K 2 CO 3 with 12.0g TiO 2 (the molar ratio is 1:3) and put it into a mortar. After grinding well, put the powder into a crucible, calcined at 150°C for 2h, then raised the temperature to 960°C, calcined for 10h, and after cooling, K 2 Ti 4 o 9 ;

[0030] 1.0g K 2 Ti 4 o 9 Mix with 2.0g urea in 15g ethanol, heat again to evaporate the solvent, move to a muffle furnace for calcination at 400°C for 4h, cool, wash with water, and dry to obtain N-K 2 Ti 4 o 9 . Resulting N-K 2 Ti 4 o 9 The XRD pattern of figure 1 As shown, the TEM image is shown in figure 2 (b) shown.

[0031] 2. N-K 2 Ti 4 o 9 preprocessing

[0032] N-K obtained in step 1 2 Ti 4 o 9 Add to 100mL sodium oxalate aqueous solution (0.22mol L -1 ), stirred for 2...

Embodiment 2

[0046] This embodiment prepares N-K in the same manner as in Example 1 2 Ti 4 o 9 / g -C 3 N 4 / UiO-66 ternary high-efficiency composite visible light photocatalyst, the difference is only N-K in step 6 2 Ti 4 o 9 / g -C 3 N 4 The mass of the binary composite was changed to 0.027g. The resulting product N-K 2 Ti 4 o 9 / g -C 3 N 4 / UiO-66(1:2) photocatalytic performance such as Figure 4 shown.

Embodiment 3

[0048] This embodiment prepares N-K in the same manner as in Example 1 2 Ti 4 o 9 / g -C 3 N 4 / UiO-66 ternary high-efficiency composite visible light photocatalyst, the difference is only N-K in step 6 2 Ti 4 o 9 / g -C 3 N 4 The mass of the binary composite was changed to 0.035g. The resulting product N-K 2 Ti 4 o 9 / g -C 3 N 4 / UiO-66(2:3) photocatalytic performance is shown in Figure 4.

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Abstract

The invention discloses a ternary efficient compound visible light photocatalytic material and a preparation method and application thereof. The preparation method is characterized by comprising the following steps: preparing N-K2Ti4O9 and g-C3N4 by a forging method, preparing an N-K2Ti4O9 / g-C3N4 binary composite material via electrostatic attraction, and further synthesizing an N-K2Ti4O9 / g-C3N4 / UiO-66 ternary efficient compound visible light photocatalytic catalyst via self-assembling by a solvothermal method. According to the invention, the characteristics of good visible light response of N-K2Ti4O9, high conduction electron hole capacity of g-C3N4 and high MOF material adsorption amount of UiO-66 are utilized; the ternary compound light catalyst synthesized by integrating the advantages of N-K2Ti4O9, g-C3N4 and UiO-66 has obviously reinforced activity of performing photocatalytic degradation on organic dye under visible light under the effect of compound promoted photogenerated charge separation, and has wide application prospect in the field of photocatalysis.

Description

technical field [0001] The invention belongs to the fields of material preparation, visible light photocatalysis technology and environmental protection, and specifically relates to a ternary high-efficiency composite photocatalyst N-K 2 Ti 4 o 9 / g -C 3 N 4 / Preparation of UiO-66 and its application in catalytic degradation of organic pollutants in water under visible light. Background technique [0002] Today's energy shortages and environmental pollution have attracted more and more attention, and the sustainable development of human society is facing enormous challenges. Photocatalytic technology is a new treatment technology for degrading environmental pollutants. It has the advantages of low-carbon, clean, and environmentally friendly. Therefore, it is an ideal way to solve energy and environmental problems. However, traditional photocatalysts such as titanium dioxide have high band gaps, The shortcomings of photogenerated electron-hole recombination rate and oth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22B01J27/24C02F1/30
Inventor 刘雪霆徐艳丽刘飞扬
Owner HEFEI UNIV OF TECH
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