Preparation method of Ag@AgCl/TiO2-graphene oxide composite

A composite material and graphene technology, applied in chemical instruments and methods, water treatment of special compounds, water/sludge/sewage treatment, etc., can solve the problem of low quantum efficiency of photocatalysis, achieve good adsorption of pollutants, improve light Effects of catalytic efficiency and strong adsorption capacity

Active Publication Date: 2017-05-31
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to TiO 2 Has a large band gap (3.0-3.2eV), pure TiO 2 The photocatalytic quantum efficiency of th...

Method used

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  • Preparation method of Ag@AgCl/TiO2-graphene oxide composite
  • Preparation method of Ag@AgCl/TiO2-graphene oxide composite
  • Preparation method of Ag@AgCl/TiO2-graphene oxide composite

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Experimental program
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Effect test

Embodiment 1

[0033] (1) First, 0.068g AgNO 3 and 0.5g PDDA were dissolved in 20ml deionized water, and then AgNO 3 Add the solution dropwise to the PDDA solution, and stir for 15 minutes to obtain the Ag+ dispersion;

[0034] (2) Dissolve 0.0234g NaCl and 0.1g glucose in 20mL and 60mL deionized water respectively to prepare a solution, and add the prepared NaCl solution and glucose solution dropwise to the above Ag + In the dispersion liquid, after stirring for one hour, the mixed solution was transferred to a reaction kettle, heated to 180°C and kept for hydrothermal reaction for 24 hours, and centrifuged after the reaction was completed. The centrifuged product was washed three times with ethanol and deionized water respectively, and the washed product was dissolved in deionized water to obtain Ag@AgCl sol. When preparing the Ag@AgCl sol, the product was dissolved in 20ml of deionized water per 120ml of the reaction solution. from figure 1 -a and figure 1In -b, it can be seen that t...

Embodiment 2

[0042] The other steps and parameters of Examples 2-4 are the same as in Example 1, except that the dosage of Ag@AgCl sol in step (4) is 60mL (Example 2), 80mL (Example 3) and 100ml (Example 3) respectively. Example 4).

Embodiment 5

[0046] Other parameter steps of embodiment 5-7 are identical with embodiment 3, difference is: in step (5) TiO 2 The powders were used in amounts of 0.2 g (Example 5), 0.6 g (Example 6) and 1 g (Example 7), respectively.

[0047] Compared Figure 4 with Figure 5 , when TiO 2 When the dosage is 0.2g, graphite oxide almost replaces TiO 2 The coating of nanotubes greatly affects its absorption of light; and when TiO 2 When the dosage is 1g, TiO 2 Excess, some TiO 2 Not formed into tubes and not composited with graphite oxide.

[0048] Then compare its photocatalytic performance, when TiO 2 When the dosage is 0.4g, the photocatalytic performance is the best. Within 20 minutes, the photocatalytic efficiency reaches over 80%, and the methylene blue is basically degraded in about 40 minutes. When TiO 2 When the dosage was 0.6g, the photocatalytic performance decreased. And when TiO 2 When the dosage is 0.2g and 1g, the photocatalytic performance drops sharply. The former ...

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Abstract

The invention belongs to the technical field of inorganic functional materials and particularly discloses a preparation method of an Ag@AgCl/TiO2-graphene oxide composite. The preparation method comprises the following steps: mixing Ag@AgCl nanometer particles and GO, and directly carrying out hydrothermal reaction on a mixture and TiO2 under the alkaline condition to obtain the Ag@AgCl/TiO2-graphene oxide composite. Compared with an ordinary photocatalytic material, effective photocatalytic reaction can be carried out on the Ag@AgCl/TiO2-graphene oxide composite in both a visible light region and an ultraviolet light region, and a light source is more fully utilized; the composite can better adsorb pollutants with larger specific surface area and strong adsorption ability; and in presence of reduced graphene oxide, composite of photo-induced electron pairs can be effectively inhibited, and thus the photocatalytic performance is improved to a great extent. The Ag@AgCl/TiO2-graphene oxide composite is cheap and available in used raw materials and simple and feasible in preparation and composite processes and is a photocatalytic material with a great potentiality.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional materials, in particular to an Ag@AgCl / TiO 2 -Preparation method of graphene oxide composite material. Background technique [0002] Nano-TiO 2 With the advantages of stable chemical properties, light corrosion resistance and strong photocatalytic oxidation ability, it is widely used in photocatalytic degradation of various pollutants. Titanium dioxide nanotubes (TiO 2 NTs) is TiO 2 One of the existing forms, has the advantage of high specific surface area, and other forms of TiO 2 Compared to TiO 2 Nanotubes exhibit higher photocatalytic ability. However, due to TiO 2 Has a large band gap (3.0-3.2eV), pure TiO 2 The photocatalytic quantum efficiency of the photocatalyst is low, and the effective photocatalytic reaction can only occur under the driving of ultraviolet light. Based on this, many scholars modified TiO 2 or compound it with metals or photocatalytic materials in ...

Claims

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Application Information

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IPC IPC(8): B01J27/135B01J20/20C02F1/28C02F1/30C02F1/32
CPCB01J20/0233B01J20/0288B01J20/06B01J20/20B01J27/135B01J35/004C02F1/288C02F1/30C02F1/32C02F2305/10
Inventor 涂文懋潘红飞
Owner WUHAN UNIV OF TECH
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