Bismuth-oxybromide-cadmium sulfide nano composite photocatalyst and preparation method thereof

A bismuth oxybromide and nanocomposite technology, which is applied in the field of photocatalyst material preparation, can solve the problems of limiting solar energy utilization, achieve high visible light catalytic activity, simple process equipment, and cheap and easy-to-obtain raw materials

Active Publication Date: 2017-12-29
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional photocatalyst TiO 2 It is a typical wide bandgap (3.0eV-3.2eV) semiconductor material, which can only respond in the ultraviolet region, thus limiting its utilization of solar energy

Method used

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  • Bismuth-oxybromide-cadmium sulfide nano composite photocatalyst and preparation method thereof
  • Bismuth-oxybromide-cadmium sulfide nano composite photocatalyst and preparation method thereof
  • Bismuth-oxybromide-cadmium sulfide nano composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] ①. Preparation of bismuth oxybromide nanosheets

[0026] Weigh 1.8mmol of CTAB (about 0.6547g), 1.8mmol of Bi(NO 3 ) 3 ·5H 2 O (about 0.8731g) was put into the reaction kettle, added 48mL of distilled water, stirred for 25min to make it fully dissolved, after that, adjusted the pH of the solution to neutral with 1M NaOH solution, continued to stir for 1.5h; kept at 160°C for 30h Afterwards, naturally cool to room temperature, suction filter, dry, and collect square-shaped bismuth oxybromide nanosheets.

[0027] See attached figure 1 , by the X-ray powder diffraction analysis (XRD) spectrogram of the bismuth oxybromide nanosheet that the method described in step 1. in embodiment 1 makes. The peak positions of the spectral lines in the figure correspond to all the diffraction crystal planes of the JCPDF standard card (09-0393), indicating that they are tetragonal BiOBr crystals, space group P4 / nmm, and lattice constant No impure diffraction peaks were found, indicat...

Embodiment 2

[0034] ①. Preparation of bismuth oxybromide nanosheets

[0035] Weigh 1.2mmol of CTAB (about 0.4365g), 1.2mmol of Bi(NO 3 ) 3 ·5H 2 O (about 0.5820g) is put into the reaction kettle, add 40mL of distilled water, stir for 15min to fully dissolve, then adjust the pH of the solution to neutral with 1M NaOH solution, continue stirring for 0.5h; keep warm at 180°C for 10h Afterwards, naturally cool to room temperature, suction filter, dry, and collect square-shaped bismuth oxybromide nanosheets.

[0036] ②. Reaction of cadmium sulfide nanocrystals on bismuth oxybromide nanosheets

[0037] Take a tall beaker A, add 0.0914g of bismuth oxybromide (about 0.3mmol) nanosheets and 30mL of distilled water, ultrasonically disperse for 18min; then add 0.2mmol of Cd(CH 3 COO) 2 ·3H 2 0, stir and dissolve; get another beaker B, add 1mmol of thiourea (0.0761g), 0.4mL of ethylenediamine and 30mL of water, stir and dissolve to be a transparent homogeneous clear solution; the solution in bea...

Embodiment 3

[0041] ①. Preparation of bismuth oxybromide nanosheets

[0042] Weigh 1.5mmol of CTAB (about 0.5456g), 1.5mmol of Bi(NO 3 ) 3 ·5H 2 O (about 0.7276g) is put into the reaction kettle, add 45mL of distilled water, stir for 20min to make it fully dissolved, then adjust the pH of the solution to neutral with 1M NaOH solution, and continue to stir for 1h; after 17h at 170°C , naturally cooled to room temperature, suction filtered, dried, and collected to obtain square bismuth oxybromide nanosheets.

[0043] ②. Reaction of cadmium sulfide nanocrystals on bismuth oxybromide nanosheets

[0044] Take a tall beaker A, add 0.1000 g of bismuth oxybromide (about 0.328 mmol) nanosheets and 30 mL of distilled water, and ultrasonically disperse for 20 min; then add 0.4 mmol of Cd(CH 3 COO) 2 ·3H 2 0, stir and dissolve; get another beaker B, add 1mmol of thiourea (0.0761g), 0.4mL of ethylenediamine and 30mL of water, stir and dissolve to be a transparent homogeneous clear solution; the s...

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Abstract

The invention discloses a bismuth-oxybromide-cadmium sulfide nano composite photocatalyst and a preparation method thereof and relates to the technical field of photocatalyst material preparation. The preparation method includes: utilizing cetyl trimethyl ammonium bromide and cadmium sulfide for reaction to obtain a bismuth-oxybromide nanosheet; allowing reaction on the bismuth-oxybromide nanosheet to generate cadmium sulfide nano crystals. Microstructure of the composite photocatalyst is characterized in that the cadmium sulfide nano crystals uniformly grow on the surface of the bismuth-oxybromide nanosheet which mainly presents a square structure, the cadmium sulfide nano crystals growing on the bismuth-oxybromide nanosheet are quantum dots, and particle size is 1-5nm. The bismuth-oxybromide-cadmium sulfide nano composite photocatalyst has high visible light catalytic activity, can remarkably increase degradation rate of organic dye and is expected to be used for organic pollutants in sunlight degraded water. The preparation method is simple in process equipment, simple and convenient to operate, high repeatability, low-in-cost and easy-to-get in raw material and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of preparation of photocatalyst materials, in particular to a bismuth oxybromide-cadmium sulfide nanocomposite photocatalyst and a preparation method thereof. Background technique [0002] Since modern times, due to the massive consumption of fossil raw materials such as coal, oil and natural gas, human beings are facing a great energy crisis and severe environmental pollution problems. In 1972, Fujishima and Honda reported TiO 2 The electrode decomposes water to produce hydrogen under near-ultraviolet light irradiation, thus kicking off the prelude to photocatalytic research. Traditional photocatalyst TiO 2 It is a typical wide band gap (3.0eV-3.2eV) semiconductor material, which can only respond in the ultraviolet region, thus limiting its utilization rate of solar energy. In recent years, bismuth-based materials have attracted more and more attention from scholars due to their better photocatalytic act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/138B82Y30/00B82Y40/00B01J37/34C02F1/30C02F101/30
CPCB01J27/138B01J35/004B01J37/343B01J37/346B82Y30/00B82Y40/00C02F1/30C02F2101/308C02F2305/10
Inventor 邓崇海姚李王黎丽吴义平董强
Owner HEFEI UNIV
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