Preparation method and application of superparamagnetic ferroferric oxide@silicon dioxide@cadmium sulfide core-shell nano-structure material

A technology of ferroferric oxide and nano-core shell, which is applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve high energy consumption, complicated preparation process, Long production cycle and other issues, to achieve the effect of precise reaction conditions, simple operation, and short preparation cycle

Inactive Publication Date: 2019-12-13
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The composition methods of ferroferric oxide and cadmium sulfide composite nanomaterials that have been reported so far include microwave method, microemulsion method, precipitation method, hydrothermal method, sol-gel method, etc. However, most of these methods have complicated preparation process and high energy consumption. High, long production cycle and other disadvantages
In addition, factors such as the structure, size and shape of nanomaterials affect the expression of its optical properties, and the Fe prepared by the current method 3 o 4 / CdS nanoparticles have large defects in shape, size and dispersion

Method used

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  • Preparation method and application of superparamagnetic ferroferric oxide@silicon dioxide@cadmium sulfide core-shell nano-structure material
  • Preparation method and application of superparamagnetic ferroferric oxide@silicon dioxide@cadmium sulfide core-shell nano-structure material
  • Preparation method and application of superparamagnetic ferroferric oxide@silicon dioxide@cadmium sulfide core-shell nano-structure material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The first step is to synthesize superparamagnetic ferriferric oxide nanoclusters: sequentially add 0.248g sodium polyacrylate (PAA) and 0.045g ferric chloride to 13mL diethylene glycol (DEG), stir and heat to 205 °C and maintained for one hour. followed by a rapid injection of 1.5mL of 0.15mol L -1 The NaOH DEG solution was stirred at 205°C for 0.5 hours. After the reaction was completed, the reaction liquid was collected by centrifugation, then added 5 mL of ultrapure water and 6 mL of ethanol to wash by centrifugation, and then washed twice with alcohol, and the volume was fixed in 2 mL of water.

[0033] The second step, the preparation of Fe 3 o 4 @SiO 2 Microspheres: ultrasonically disperse the above product in 15mL ethanol, add 0.5mL concentrated ammonia water (26%) after ultrasonication for 5 minutes, add 40μL tetraethyl silicate (TEOS) after ultrasonication for 5 minutes, ultrasonically react for 20 minutes, wash with alcohol Three times, washed twice with ...

Embodiment 2

[0037] The first step is to synthesize superparamagnetic ferriferric oxide nanoclusters: sequentially add 0.288g sodium polyacrylate (PAA) and 0.065g ferric chloride to 17mL diethylene glycol (DEG), stir and heat to 220 °C and maintained for one hour. followed by a rapid injection of 1.8 mL of 0.25 mol L -1 The NaOH DEG solution was stirred at 220°C for one and a half hours. After the reaction was completed, 7 mL of ultrapure water and 8 mL of ethanol were added to the reaction liquid for centrifugation washing, and the product was dispersed in 3 mL of water after washing with alcohol three times.

[0038] The second step, the preparation of Fe 3 o 4 @SiO 2 Microspheres: ultrasonically disperse the above product in 20mL ethanol, add 1mL concentrated ammonia water (26%) after ultrasonication for 5 minutes, add 60μL tetraethyl silicate (TEOS) after mechanical stirring for 10 minutes, stir vigorously, react for 30 minutes, alcohol Wash three times, wash twice with water, and...

Embodiment 3

[0042] The first step is to synthesize superparamagnetic ferriferric oxide nanoclusters: add 0.305g sodium polyacrylate (PAA) and 0.098g ferric chloride to 30mL diethylene glycol (DEG) successively, stir and heat to 240 °C and maintained for 1.5 hours. This was followed by a rapid injection of 3 mL of 0.36 mol L -1 The NaOH DEG solution was stirred at 240°C for 1.9 hours. After the reaction was completed, the reaction solution was dilute to 49 mL with ethanol and collected by centrifugation, then 9.5 mL of ultrapure water and 8 mL of ethanol were added for centrifugation washing, and the product was dispersed in 5 mL of water after three alcohol washes.

[0043] The second step, the preparation of Fe 3 o 4 @SiO 2 Microspheres: Ultrasonic disperse the above product in 30mL ethanol, add 3mL concentrated ammonia water (26%) after ultrasonication for 20 minutes, add 100μL tetraethyl silicate (TEOS) after ultrasonication for 16 minutes, ultrasonic reaction for 60 minutes, wash ...

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Abstract

The invention belongs to the field of functional materials and discloses a preparation method and application of a superparamagnetic ferroferric oxide@silicon dioxide@cadmium sulfide core-shell nano-structure material. The Fe3O4@SiO2@CdS double core-shell structure nano-material with uniform size and even dispersion is successfully prepared by linking SiO2 as an interface transition medium with asuperparamagnetic Fe3O4 nano-cluster and a CdS nano-semiconductor shell layer. The double core-shell structure nano-material has excellent optical performance, and can be reclaimed and separated in acomplicated reaction through a simple magnetic operation. The synthesizing method is simple in operation, can avoid high-temperature high-pressure strict reacting conditions, and can effectively eliminate crystal face mismatching of Fe3O4 and CdS, so that the form and dispersibility of the double core-shell structure can be well guaranteed. Furthermore, the Fe3O4@SiO2@CdS core-shell structure nano-material prepared by the method can be successfully applied to photocatalytic degradation of rhodamine B.

Description

technical field [0001] The invention belongs to the field of functional materials, and discloses a preparation method and application of a superparamagnetic iron tetroxide@silicon dioxide@cadmium sulfide nano core-shell structure material. Background technique [0002] CdS is a very important semiconductor material with a band gap of 2.41eV. Due to its excellent light absorption ability in the visible range, CdS is widely used in various fields such as photocatalysis, solar cells, and photoelectrochemical sensors. However, CdS itself is toxic, and long-term exposure will cause harm to the respiratory system and digestive system of organisms. Therefore, how to efficiently recover CdS and realize the recycling of CdS has become a problem that needs to be solved. Biocompatible magnetic nano-Fe3O4 has the characteristics of easy operation, easy separation, modification, and low toxicity. In terms of its separation efficiency, nano-Fe 3 o 4 Magnetic separation has become an em...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C02F1/30C02F101/30
CPCB01J23/002B01J27/04B01J35/0013B01J35/0033B01J35/004B01J35/008C02F1/30C02F2101/308C02F2305/10
Inventor 徐凌秋韩敏李红波方海林王伟牛湘衡
Owner JIANGSU UNIV
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