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Ag2CrO4-loaded g-C3N4 composite photocatalyst and preparation method and application thereof

A technology of g-c3n4 and -g-c3n4, which is applied in the field of g-C3N4 composite photocatalyst and its preparation, can solve the problems of unfavorable material loading and dispersion, inability to form flakes, low photocatalytic activity, etc., and achieve inhibition of photocorrosion Phenomenon, enhanced photoresponse degree, small particle effect

Inactive Publication Date: 2016-09-21
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However pure g-C 3 N 4 Due to its low quantum yield, it exhibits low photocatalytic activity; and g-C prepared under conventional conditions 3 N 4 The block is large and cannot form a thin sheet, which is not conducive to the loading and dispersion of other materials

Method used

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  • Ag2CrO4-loaded g-C3N4 composite photocatalyst and preparation method and application thereof
  • Ag2CrO4-loaded g-C3N4 composite photocatalyst and preparation method and application thereof
  • Ag2CrO4-loaded g-C3N4 composite photocatalyst and preparation method and application thereof

Examples

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Embodiment 1

[0039] A kind of Ag of the present invention 2 CrO 4 Loaded g-C 3 N 4 Composite photocatalyst, Ag 2 CrO 4 Loaded g-C 3 N 4 Composite photocatalyst with g-C 3 N 4 Nanosheet as carrier, g-C 3 N 4 Nanosheet carrier modified with Ag 2 CrO 4 nanoparticles.

[0040] Among them, Ag 2 CrO 4 Nanoparticles were aggregated on g-C by co-precipitation method 3 N 4 The surface of the nanosheet carrier, Ag 2 CrO 4 and g-C 3 N 4 The mass ratio is 1:2.

[0041] The above Ag 2 CrO 4 Loaded g-C 3 N 4 The preparation method of composite photocatalyst comprises the following steps:

[0042] (1) Put 5.0 g of melamine in a ceramic crucible, cover it with a lid, place it in a muffle furnace for roasting, raise the temperature from room temperature to 500 °C at a rate of 2 °C / min, and keep it for 2 h; The temperature was raised to 520 °C, kept for 2 h, cooled to room temperature, and ground to obtain g-C 3 N 4 Powder material.

[0043] (2) Weigh 1.0 g of g-C obtained in s...

Embodiment 2

[0056] A kind of Ag of embodiment 1 2 CrO 4 Loaded g-C 3 N 4 The application of composite photocatalyst in methyl orange dye wastewater treatment comprises the following steps:

[0057] (1) Weigh 20 mg of Ag prepared in Example 1 2 CrO 4 Loaded g-C 3 N 4 The composite photocatalyst was added to 100 mL of methyl orange dye wastewater with an initial concentration of 10 mg / L in a light-proof environment to obtain a mixed solution, which was placed in a photocatalytic reaction device after adsorption for 2 h.

[0058] (2) A 300W xenon lamp was used for photocatalytic reaction. Measure the absorbance value of the reaction solution at a wavelength of 464 nm at time t, combine the standard curve to obtain the concentration C of methyl orange at time t, and calculate the removal rate D of methyl orange according to the formula D=(Co-C) / Co×100% , where Co is the initial concentration of methyl orange.

[0059] Weigh respectively 20 mg of g-C prepared in Example 1 3 N 4 and ...

Embodiment 3

[0063] Ag after the reaction in embodiment 2 2 CrO 4 / g -C 3 N 4 The composite catalyst material was collected by centrifugation, washed with a large amount of water and ethanol, and dried in an oven at 60 °C for 12 h, and then the photocatalytic process in Example 2 was repeated. The test was repeated 5 times, and the photocatalytic experiment was tested 5 times After Ag 2 CrO 4 / g -C 3 N 4 Composite catalyst material to the removal rate of dyestuff, cycle experiment result sees Figure 7 . Depend on Figure 7 It can be seen that in the fifth photocatalytic experiment, the photocatalytic removal rate can still reach 80%, indicating that this material has good photocatalytic stability.

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Abstract

The invention discloses a Ag2CrO4-loaded g-C3N4 composite photocatalyst and belongs to the technical field of functional composite photocatalysts. A g-C3N4 nanosheet is used as a carrier, and the g-C3N4 nanosheet carrier is modified with Ag2CrO4 nanoparticles. A preparation method of the composite photocatalyst includes following steps: adding the g-C3N4 nanosheet into water for ultrasonic dispersion to form a g-C3N4 nanosheet suspension, and adding silver nitrate to obtain mixed liquid of Ag+ and g-C3N4; adding potassium chromate into the mixed liquid of Ag+ and g-C3N4, and stirring to obtain the composite photocatalyst. The composite photocatalyst is high in photocatalytic activity and stability, the preparation method is simple and low in cost and energy consumption, the composite photocatalyst can be used for photocatalytic degrading of dye wastewater, and application is simple in method and high in removal rate.

Description

technical field [0001] The invention belongs to the technical field of functional composite photocatalysts, in particular to an Ag 2 CrO 4 Loaded g-C 3 N 4 Composite photocatalyst and its preparation method and application. Background technique [0002] With the development of nanomaterial technology, the treatment of organic or inorganic pollutants in the environment with semiconductor photocatalysis technology has become a promising environmental restoration technology. In particular, the development of visible light-responsive semiconductor photocatalytic materials has further promoted the application of semiconductor photocatalytic technology in the field of environmental restoration. [0003] Silver-based photocatalytic materials have been widely used in visible light catalytic degradation to remove environmental pollutants due to their unique crystal structure, wide visible light response region, and excellent photocatalytic performance. At present, the silver-bas...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J32/00B01J37/08C02F1/30C02F101/30
CPCC02F1/30B01J27/24B01J37/08C02F2101/308C02F2305/10B01J35/39
Inventor 汤琳邓垚成曾光明王佳佳彭博刘雅妮朱菁菁
Owner HUNAN UNIV
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