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Silanized reduced graphene oxide-titanium dioxide composite material, and preparation method and application thereof

A technology of titanium dioxide and composite materials, which is applied in the field of water pollution treatment, can solve the problems of reducing the adsorption performance of composite materials to pollutants, the solubility of composite materials, and restricting the application, so as to enhance the photocatalytic performance, improve the adsorption performance, and reduce the content of Cd2+. Effect

Active Publication Date: 2020-05-22
XIAMEN UNIV
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  • Description
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Problems solved by technology

However, after reduction, most of the oxygen-containing groups in graphene oxide, such as hydroxyl, carboxyl, and epoxy groups, will be removed, reducing the adsorption performance of the composite to pollutants and the solubility of the composite in water, which will also Limit its application in the treatment of water pollutants

Method used

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  • Silanized reduced graphene oxide-titanium dioxide composite material, and preparation method and application thereof
  • Silanized reduced graphene oxide-titanium dioxide composite material, and preparation method and application thereof
  • Silanized reduced graphene oxide-titanium dioxide composite material, and preparation method and application thereof

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preparation example Construction

[0033] The present invention provides a kind of preparation method of silanization reduction graphene oxide titanium dioxide composite material, comprises the following steps:

[0034] (1) Stir after mixing the tetrabutyl titanate solution and the graphene oxide aqueous dispersion, then remove the solvent to obtain the graphene oxide / titanium dioxide composite material;

[0035] (2) dispersing the graphene oxide / titanium dioxide composite material in a polar organic solvent to obtain a graphene oxide / titanium dioxide dispersion;

[0036] (3) Graphene oxide / titanium dioxide dispersion liquid and N-(trimethoxysilylpropyl) sodium ethylenediamine triacetate are mixed, carry out heating reaction, then add methanol in reaction liquid, carry out hydrothermal reaction again, A silylated-reduced graphene oxide-titanium dioxide composite material was obtained.

[0037] In the invention, the tetrabutyl titanate solution and the graphene oxide aqueous dispersion are mixed, stirred, and t...

Embodiment 1

[0053] (1) Prepare graphene oxide by improved Hummers method

[0054] Slowly dissolve 2g of sodium nitrate and 2g of graphite in 92mL of commercially available concentrated sulfuric acid, and continuously stir in an ice-water bath for 4h, then slowly add 12g of potassium permanganate while keeping the temperature below 20°C, and then stir at room temperature until Unable to stir, then add 200mL deionized water dropwise, stir at about 90°C for 10min, cool to room temperature, add 20mL hydrogen peroxide dropwise, the solution is bright yellow, after standing for a day, use 10% volume fraction of dilute hydrochloric acid and deionized water Centrifugal cleaning to neutrality, freeze-drying to obtain graphene oxide.

[0055] (2) Preparation of graphene oxide / titanium dioxide composites

[0056] Slowly add 2.2 mL of tetrabutyl titanate into 40 mL of absolute ethanol, stir for 40 minutes to mix evenly, and record it as liquid A; then add 50 mg of graphene oxide into 15 mL of deioni...

Embodiment 2

[0060] (1) prepare graphene oxide according to the method for embodiment 1;

[0061] (2) Slowly add 3.5mL of tetrabutyl titanate into 35mL of absolute ethanol, stir for 20min to mix evenly, and record it as liquid A; then add 70mg of graphene oxide into 10mL of deionized water, and ultrasonically disperse to obtain graphene oxide Dispersion liquid, then keep the dispersion liquid stirring state, slowly add liquid A into it, after the addition is completed, continue to stir the reaction for 1h, and finally stop stirring, rotate steam at 60°C, collect the residue of rotary evaporation, and freeze-dry to obtain graphene oxide / Titanium dioxide composite material;

[0062] (3) Add 50 mg of graphene oxide / titanium dioxide composite material to 50 mL of ethanol, and disperse it by ultrasonic treatment for 2 h; Sodium acetate aqueous solution (abbreviated as EDTA-silane), and stirred at 55°C for 12h; after the reaction was completed, 80mL of methanol was added to dilute unreacted s...

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Abstract

The invention relates to the field of water pollution treatment, and provides a silanized reduced graphene oxide-titanium dioxide composite material, and a preparation method and application thereof.According to the preparation method, tetrabutyl titanate is subjected to in-situ reduction and then compounded with graphene oxide, and then the formed mixture reacts with N-(trimethoxysilylpropyl)ethylenediamine triacetic acid sodium salt so as to prepare the composite material which takes graphene oxide as a substrate and is bonded with titanium dioxide and N-(trimethoxysilylpropyl)ethylenediamine triacetic acid sodium salt. The silanized reduced graphene oxide-titanium dioxide composite material prepared by the method has good adsorption performance on pollutants and good photocatalytic performance. Results of embodiments show that the silanized reduced graphene oxide-titanium dioxide composite material provided by the invention can effectively reduce the content of pollutants Cd<2+>, and has a good degradation effect on phenol.

Description

technical field [0001] The invention relates to the field of water pollution treatment, in particular to a silanized reduced graphene oxide titanium dioxide composite material and its preparation method and application. Background technique [0002] Water pollutants can be roughly divided into three categories, namely heavy metal ions (Cr 3+ , Ni 2+ and Cu 2+ ), toxic metal ions (Cd 2+ , As 2+ and Hg 2+ ) and organic dye waste. Among them, the toxic metal ion cadmium (Cd 2+ ) and phenol dyes are considered to be the most common toxic wastes in industry, which are difficult to degrade and easy to accumulate in the aquatic environment. [0003] TiO 2 It has the characteristics of non-toxicity, low cost, environmental safety, high chemical stability and high photocatalytic activity, and has wide application in the field of treating water pollutants. However, TiO 2 The wide energy band gap (~3.2eV) of the solar spectrum limits the light absorption (5%) in the ultraviol...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/30B01J20/22B01J31/38B01J35/00B01J20/30C02F101/20
CPCC02F1/283C02F1/285C02F1/30B01J20/20B01J20/223B01J31/38C02F2101/20C02F2305/10B01J35/39
Inventor 敬科举熊攀申玉姣张旺
Owner XIAMEN UNIV
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