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Preparation method for amino-functionalization graphene/TiO2 composite material with selective photocatalytic degradation function

A composite material and photocatalytic technology, which is applied in the field of preparation of amine functionalized graphene/TiO2 composite materials, achieves the effects of simple operation, low equipment requirements, good social and economic benefits

Inactive Publication Date: 2015-05-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, to the best of our knowledge, there is no research on the use of amine functionalized graphene on TiO 2 Surface modification of photocatalytic materials, so that TiO 2 Related reports of photocatalysts capable of selectively degrading azo dyes

Method used

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  • Preparation method for amino-functionalization graphene/TiO2 composite material with selective photocatalytic degradation function
  • Preparation method for amino-functionalization graphene/TiO2 composite material with selective photocatalytic degradation function
  • Preparation method for amino-functionalization graphene/TiO2 composite material with selective photocatalytic degradation function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] PhNH 2 / rGO-TiO 2 The preparation process of the photocatalyst is as follows: (1) 0.2g commercial P25TiO 2 Add the powder into 10mL graphene oxide (0.2mg / mL) solution, stir evenly to form a stable suspension solution, in which graphene oxide and TiO 2 The mass ratio of is 1wt%; (2) the TiO of step (1) configuration 2 Transfer the blackene oxide suspension to a hydrothermal kettle, and conduct a hydrothermal reaction at a constant temperature of 160°C for 8 hours to obtain a reduced graphene-modified titanium dioxide composite material; (3) uniformly disperse the product obtained in step (2) into the aniline The impregnation treatment is carried out in the ethanol solution, wherein the mass ratio of aniline to graphene oxide is 30:1; (4) under stirring, the mixed solution obtained in step (3) is placed at a constant temperature of 35°C for 5h, and the obtained product After being washed three times with alcohol and water respectively, and then dried at a constant temp...

Embodiment 2

[0036] In order to examine the effect of hydrothermal reaction temperature on PhNH 2 / rGO-TiO 2 Influence of photocatalyst photocatalytic selectivity, in addition to hydrothermal reaction temperature, other reaction conditions such as hydrothermal reaction time (8h), mass ratio of aniline to graphene oxide (30:1), immersion temperature (35°C), immersion time (5h), drying temperature (60 DEG C) etc. are all identical with embodiment 1. The results show that when the hydrothermal reaction temperature is 100 °C, TiO 2 It is not well combined with rGO, and the degree of reduction of GO is low, the formed PhNH 2 / rGO-TiO 2 Photocatalysts cannot selectively degrade MO; when the hydrothermal reaction temperature is 140-180 °C, the degree of reduction of GO is high, and uniform and stable TiO can be formed 2 -rGO composite phase, and then formed PhNH 2 / rGO-TiO 2 Photocatalysts have the ability to efficiently and selectively degrade MO; when the hydrothermal reaction temperature...

Embodiment 3

[0038] In order to examine the effect of hydrothermal reaction time on PhNH 2 / rGO-TiO 2 Influence of photocatalyst photocatalytic selectivity, in addition to hydrothermal reaction time, other reaction conditions such as hydrothermal reaction temperature (160°C), mass ratio of aniline to graphene oxide (30:1), impregnation temperature (35°C), impregnation Time (5h), drying temperature (60° C.) etc. are all the same as in Example 1. The results show that when the hydrothermal reaction time is 1 h, the reduction degree of GO is low due to the short hydrothermal time, and the synthesized PhNH 2 / rGO-TiO 2 The photocatalyst does not have the ability to selectively degrade MO; when the hydrothermal reaction time is 6-10h, GO can be effectively reduced to rGO, and the formed PhNH 2 / rGO-TiO 2 The photocatalyst has obvious photocatalytic selective degradation performance on MO. When the hydrothermal time is extended to 15h, PhNH 2 / rGO-TiO 2 The photocatalytic selective perfor...

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Abstract

The invention relates to a preparation method for amino-functionalization graphene / TiO2 composite material with a selective photocatalytic degradation function. The method comprises the following steps: 1) TiO2 powder is added into a graphene oxide solution, and is mixed to form a supernatant solution; 2) the supernatant solution is transferred to a hydrothermal kettle to obtain a titanium dioxide composite material modified by reduction graphene; 3) the composite material is uniformly scattered into an aniline ethanol solution for soaking; 4) during mixing, the mixed solution is subjected to soaking, washing and constant-temperature drying so as to obtain the amino-functionalization graphene / TiO2 composite material. The preparation method has the beneficial effects that the composite photocatalytic material shows unique selective photocatalytic degradation performance to azo dyes, and a theoretical basis and application guidance are provided for development of technology for treating poisonous and harmful azo dyes during environmental governance. The preparation method has the advantages that the operation is very simple, the equipment is low in requirement, various reaction devices are not needed, and the amino-functionalization graphene / TiO2 composite material can be easily synthesized in a large scale.

Description

technical field [0001] The present invention relates to amine-functionalized graphene / TiO with selective photocatalytic degradation 2 Methods of preparation of composite materials. Background technique [0002] In recent years, with the increasingly serious problem of environmental pollution, photocatalytic degradation of organic pollutants has received more and more attention, so how to better improve the efficiency of photocatalytic degradation has become very important. As an environmentally friendly, stable, non-toxic and cheap photocatalytic material, titanium dioxide has broad application prospects. However, titanium dioxide has a wide band gap and can only absorb ultraviolet light with a wavelength less than 380nm; and TiO 2 The photogenerated electrons and holes in the titanium dioxide are easily recombined inside, resulting in low quantum efficiency, which greatly limits the wide application of titanium dioxide in actual production. Therefore, how to modify TiO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38C02F1/30C02F101/38
Inventor 余火根肖偏田静王苹余家国
Owner WUHAN UNIV OF TECH
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