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Fiber chelated TiO2 visible light catalyst based on LMCT effect and N doping, and preparation method thereof

A catalyst and visible light technology, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as loss of visible light absorption, difficulty in obtaining visible light catalytic activity, etc., to achieve High visible photocatalytic activity, excellent long-term cycle stability, and convenient source

Pending Publication Date: 2021-01-08
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the visible light LMCT sensitization of most ligands is accompanied by autoxidative degradation and desorption of ligands, resulting in TiO 2 Loss of the ability to absorb visible light, it is difficult to obtain stable visible light catalytic activity

Method used

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  • Fiber chelated TiO2 visible light catalyst based on LMCT effect and N doping, and preparation method thereof
  • Fiber chelated TiO2 visible light catalyst based on LMCT effect and N doping, and preparation method thereof
  • Fiber chelated TiO2 visible light catalyst based on LMCT effect and N doping, and preparation method thereof

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preparation example Construction

[0022] The present invention also provides a fiber chelated TiO based on LMCT effect and N doping 2 The preparation method of visible light catalyst, concrete steps are:

[0023] 1) Weigh butyl titanate, glacial acetic acid and absolute ethanol at a molar ratio of 1:2:5, mix them uniformly by magnetic stirring, and add them dropwise at a rate of 0.25mL / s to a volume ratio of 1:40 glacial acetic acid in deionized water. During this period, the obtained solution was continuously stirred vigorously, and after the mixed solution was dripped, the vigorous stirring was continued for 1-2h, and then it was allowed to stand and age for 12-84h under normal temperature and dark state conditions to obtain nano-TiO 2 crystal sol.

[0024] 2) place the amidoxime modified polyacrylonitrile fiber with a weight gain rate of 13-32% in the nano-TiO prepared in step 1 according to the weight ratio of 1:50 2 In the crystal sol, make it stir and react under airtight conditions at 90-100°C for 2-...

Embodiment 1

[0027] 1) Weigh butyl titanate, glacial acetic acid and absolute ethanol at a molar ratio of 1:2:5, mix them uniformly by magnetic stirring, and add them dropwise at a rate of 0.25mL / s to a volume ratio of 1:40 In deionized aqueous solution of glacial acetic acid, the TiO 2 The concentration is 0.12mol / L. During the period, the obtained solution was continuously stirred vigorously, and after the mixed solution was dripped, the vigorous stirring was continued for 2 hours, and then it was left to stand and aged for 36 hours at room temperature and in a dark state to obtain nano-TiO 2 crystal sol.

[0028] 2) Take by weighing the amidoxime modified polyacrylonitrile fiber of 1.0g weight gain rate 32%, it is placed in the nano-TiO that 50mL step 1 prepares 2 In the crystal sol, it was stirred and reacted for 3 hours under airtight conditions at 90°C, and then it was taken out and washed and dried repeatedly with distilled water to obtain the first fiber-chelated TiO based on LMC...

Embodiment 2 3 4

[0031] Adjust the amidoxime-modified polyacrylonitrile weight gain rate in Step 2 of Example 1 to 13%, 23% and 27% respectively, and the rest are the same as in Example 1 to obtain the second, third and fourth LMCT-based Effects and N-doped fiber chelation on TiO 2 visible light catalyst. Through measurement and calculation, the titanium content on the catalyst is 4.9mg / g, 5.7mg / g and 5.9mg / g respectively.

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Abstract

The invention relates to a fiber chelated TiO2 visible light catalyst based on an LMCT effect and N doping, and a preparation method thereof, wherein modified polyacrylonitrile fibers containing amidoxime chelated group and nano TiO2 crystal sol are combined through coordination to obtain the TiO2 catalyst containing anatase crystal form and N doping. The preparation method comprises the steps that a sol containing nano TiO2 crystals is prepared by selecting butyl titanate as a titanium source and acetic acid and absolute ethyl alcohol as hydrolysis inhibitors, and then reacts with amidoxime modified polyacrylonitrile fibers to obtain the fiber chelated TiO2 visible light catalyst based on the LMCT effect and N doping. According to the invention, the method has the advantages of being simple in equipment, simple and convenient in process, easy to operate and the like; and compared with the prior art, the catalyst disclosed by the invention can realize visible light catalysis through LMCT and N doping double ways, so that the catalyst shows higher photocatalytic activity in oxidative degradation of organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis and wastewater treatment, in particular to a fiber chelated TiO based on LMCT effect and N doping, which is used in the field of oxidative degradation of organic pollutants such as dyes in wastewater 2 Visible light catalyst and preparation method thereof. Background technique [0002] With the increasingly severe global environmental problems and the continuous improvement of environmental standards, more and more attention has been paid to the treatment technology of refractory organic pollutants. Among them, solar-driven photocatalytic technology has the characteristics of low energy consumption, mild reaction conditions, and fast reaction rate, and can effectively treat hundreds of refractory organic pollutants that should be prioritized, so it has become the most promising solution to environmental pollution problems. One of the methods. Among many photocatalytic materials, titanium ...

Claims

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Application Information

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IPC IPC(8): B01J31/38C02F1/30C02F101/30
CPCB01J31/38C02F1/30C02F2101/308B01J35/39
Inventor 韩振邦邓杨赵晓明刘利伟
Owner TIANJIN POLYTECHNIC UNIV
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