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G-C3N4/WO3.H2O/Pd ternary composite photocatalyst as well as preparation method and application thereof

A WO3·H2O, ternary composite technology, applied in the field of chemical materials, can solve the problems of high photogenerated-electron-hole recombination efficiency, general electron transport ability, narrow light absorption range, etc. Simple operation method

Pending Publication Date: 2022-05-10
JIANGSU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, g-C 3 N 4 The wide application of g-C is greatly limited by its narrow light absorption range, general electron transport ability, and high photogenerated-electron-hole recombination efficiency. 3 N 4 Applications in the Field of Practical Photocatalysis

Method used

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  • G-C3N4/WO3.H2O/Pd ternary composite photocatalyst as well as preparation method and application thereof
  • G-C3N4/WO3.H2O/Pd ternary composite photocatalyst as well as preparation method and application thereof
  • G-C3N4/WO3.H2O/Pd ternary composite photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Two-dimensional thin layer g-C 3 N 4 Preparation of nanosheets

[0034] Put 10 g of urea into an alumina crucible and calcined at a high temperature of 550 °C in a muffle furnace for 4 h to obtain a bulk two-dimensional thin layer g-C 3 N 4 The nanosheets were placed in a nitric acid solution with pH=1, magnetically stirred for 8 h under the condition of heating in a water bath at 80 °C for acid treatment, washed several times until the pH was close to neutral, and then vacuum dried at 60 °C, and placed in a muffle furnace. Secondary calcination was carried out at 500 °C for 2 h, and the heating rate of the muffle furnace was 5 °C / min. After cooling to room temperature, the two-dimensional thin layer g-C can be obtained by grinding. 3 N 4 Nanosheets.

[0035] (2) WO 3 ·H 2 Preparation of O nanosheets

[0036] Put 0.33 g Na 2 WO 4 ·2H 2 O, 0.288 g citric acid and 0.75 g glucose were added to 30 mL of deionized water, vigorously magnetically stirred for 10...

Embodiment 2

[0045] In this example, the photocatalytic activity of the photocatalyst prepared in Example 1 was evaluated: the activity detection was carried out in a DW-01 photochemical reactor (purchased from Yangzhou University City Technology Co., Ltd.), and a 300 W Xe lamp was used for To simulate visible light irradiation, 0.03 g of photocatalyst was added to the photoreactor and 100 mL of deionized water was added. Pass in CO at a high flow rate 2 The gas purges the gas in the photoreactor, and then fills with atmospheric CO 2 gas. Under the condition of magnetic stirring, sampling and analysis were carried out every 1 h, and finally CO was calculated by calculation. 2 Gas-reduced CO yield. After 4 h of irradiation, the hourly average yields of CWP-0.3, CWP-0.5, and CWP-0.7 were 4.3125 μmol / g, 5.9625 μmol / g, and 4.5825 μmol / g, respectively.

[0046] figure 1 is the prepared g-C 3 N 4 / WO 3 ·H 2 XRD patterns of O / Pd composite photocatalyst CWP-0.5. Depend on figure 1 It ca...

Embodiment 3

[0052] (1) WO 3 ·H 2 Preparation of O nanosheets

[0053] Put 0.66 g Na 2 WO 4 ·2H 2 O, 0.288 g citric acid and 0.75 g glucose were added to 30 mL of deionized water, vigorously magnetically stirred for 8 min; then 3 mL of HCl (6M) was added, stirred for 50 min, transferred to a hydrothermal kettle and heated at 150 °C for 20 h get WO 3 ·H 2 O nanosheets.

[0054] (2) Two-dimensional g-C 3 N 4 / WO 3 ·H 2 Preparation of O composite photocatalyst:

[0055] Take 200 mg of g-C prepared in Example 1 3 N 4 Nanosheets with 30 mg of WO prepared in step (1) 3 ·H 2 O nanosheets were added to 60 mL of 20 vol% lactic acid solution (pH=5) and stirred for 2.5 h; after washing and drying, g-C was obtained 3 N 4 / WO 3 ·H 2 O composite photocatalyst.

[0056] (3) Preparation of Pd nanosheets:

[0057] Take 16 mg of palladium acetylacetonate (Pd(acac) 2 ), 10 mg citric acid (CA), 60 mg cetyltrimethylammonium bromide (CTAB) and 30 mg polyvinylpyrrolidone (PVP) mixed with 10...

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Abstract

The invention provides a g-C3N4 / WO3.H2O / Pd ternary composite photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of preparation of environmental protection materials. The preparation method comprises the following steps: firstly, obtaining bulk phase g-C3N4 through a calcination method, then treating the bulk phase g-C3N4 with nitric acid, carrying out secondary calcination to obtain a g-C3N4 nanosheet, and obtaining a WO3.H2O nanosheet through a hydrothermal method; then, compounding the g-C3N4 nanosheet with the WO3.H2O nanosheet by virtue of an electrostatic self-assembly method; finally, the prepared Pd nanosheets are loaded on the g-C3N4 / WO3.H2O composite material through a hydrothermal method to prepare the two-dimensional thin-layer S-type g-C3N4 / WO3.H2O / Pd composite photocatalyst, and the two-dimensional thin-layer S-type g-C3N4 / WO3.H2O / Pd composite photocatalyst can be applied to the field of photocatalytic CO2 gas reduction. The efficient two-dimensional thin-layer S-type g-C3N4 / WO3.H2O / Pd composite photocatalyst is prepared through the simple preparation method and operation process, no sacrificial agent is added, secondary pollution is avoided, and the photocatalyst is an effective and environment-friendly CO2 reduction photocatalyst.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, in particular to a kind of g-C 3 N 4 / WO 3 ·H 2 O / Pd ternary composite photocatalyst and preparation method and application thereof. Background technique [0002] Environmental pollution and energy crisis are two major problems facing human beings at present. With the development of the global economy, environmental pollution is increasing day by day. The wanton use of fossil energy and the massive emissions of carbon dioxide and other polluting gases have directly led to a series of environmental problems such as water pollution, greenhouse effect, and sea level rise. In recent years, European and American countries have also equated "carbon emission rights" with environmental pollution, and "carbon emission rights" mean the right to national development, which we urgently need to strive for. So, how to effectively reduce CO in the air 2 Concentration to effectively achieve car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/02C01B32/40
CPCB01J27/24C01B32/40B01J35/39B01J35/40
Inventor 刘祺王会琴宋相海霍鹏伟闫永胜
Owner JIANGSU UNIV
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