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TiO2/SiO2/Fe3O4 nano particle with nuclear shell structure and manufacturing method thereof

A nanoparticle, core-shell structure technology, applied in the field of nanoparticles, can solve the problems of difficult to control recycling and low catalytic efficiency, and achieve the effect of convenient and effective control and efficient recycling

Inactive Publication Date: 2009-12-09
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The present invention in order to solve nano TiO 2 The granular catalyst has low catalytic efficiency under natural light during sewage treatment, and it is difficult to meet technical problems such as controlled recovery and high catalytic activity at the same time, and a TiO with core-shell structure is provided. 2 / SiO 2 / Fe 3 o 4 Nanoparticles and methods for their manufacture

Method used

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  • TiO2/SiO2/Fe3O4 nano particle with nuclear shell structure and manufacturing method thereof
  • TiO2/SiO2/Fe3O4 nano particle with nuclear shell structure and manufacturing method thereof
  • TiO2/SiO2/Fe3O4 nano particle with nuclear shell structure and manufacturing method thereof

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Embodiment 1

[0028] Embodiment 1, a kind of TiO with core-shell structure 2 / SiO 2 / Fe 3 o 4 A method for preparing nanoparticles, comprising the following steps:

[0029] (1) FeCl 3 .6H 2 O and FeCl 2 .4H 2 O was mixed according to the amount of substances 2:1, and Fe was synthesized under alkaline conditions by coprecipitation wet chemical method. 3 o 4 Nano-magnetic core, controlled Fe by ultrasonic dispersion during the reaction 3 o 4 Particle size, improve dispersion, and then magnetic separation and water washing;

[0030] Specifically: 16mmol of FeCl 3 .6H 2 O with 8mmol of FeCl 2 .4H 2 O was added to 190ml deionized water and magnetically stirred at room temperature, and 10ml of 25% ammonia water was added to continue stirring for 10 minutes, a black precipitate was formed, which was washed with magnetic separation and water for 3 times;

[0031] (2) to Fe 3 o 4 The particle surface is treated to make it stable in aqueous solution. Use HNO first 3 Wash 2 to 3 tim...

Embodiment 2

[0040] Embodiment 2, a kind of TiO with core-shell structure 2 / SiO 2 / Fe 3 o 4 A method for preparing nanoparticles, comprising the following steps:

[0041] (1) Specifically: 16mmol of FeCl 3 .6H 2 O with 8mmol of FeCl 2 .4H 2 O was added to 190ml deionized water and magnetically stirred at room temperature, and 10ml of 25% ammonia water was added to continue stirring for 10 minutes, a black precipitate was formed, which was washed with magnetic separation and water for 3 times;

[0042] (2) to Fe 3 o 4 The particle surface is treated to make it stable in aqueous solution.

[0043] The specific treatment is as follows:

[0044] a. Use 2M HNO 3 Wash twice, filter, add NaOH to raise the pH to 2, keep the pH at 2, add 5ml of 0.5M Na to the solution 3 [C 3 h 5 (COO) 3 ] The solution was stirred for 1.5 hours;

[0045] b. Wash with deionized water, dilute the solution to 50ml, the pH value is about 6, and the concentration is 30nmol ml -1 ; Stable dispersed super...

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Abstract

The invention relates to a nano particle taking Fe3O4 as core, in particular to a TiO2 / SiO2 / Fe3O4 nano particle with nuclear structure and manufacturing method thereof. The invention solves the technical problems that nano TiO2 particle catalyst has low catalytic efficiency under natural light and is difficult to meet recovery control while remaining high catalyst activity in sewage treatment. The method includes steps of preparing SiO2 / Fe3O4 solution, preparing titanium sol and mixing the prepared SiO2 / Fe3O4 solution and the titanium sol. The invention adopts ferromagnetic particle as a carrier core and prepared TiO2 / SiO2 / Fe3O4 particle with nuclear shell structure as catalyst, and the catalyst particle has good dispersity and water-solubility and can be fully contacted with organic pollutant in sewage, thereby not only having high efficiency of suspended phase photocatalyst but also realizing magnetic control of catalyst by super paramagnetic nuclear energy, thus being effectively recovered.

Description

technical field [0001] The present invention relates to a kind of Fe 3 o 4 Nanoparticles as the core, specifically a TiO with a core-shell structure 2 / SiO 2 / Fe 3 o 4 Nanoparticles and methods of making them. Background technique [0002] At present, the problem of water pollution seriously restricts the development of economy and society. How to effectively treat sewage has become a hot spot that researchers at home and abroad are generally concerned about. [0003] Traditional organic pollutant treatment methods include physical methods, chemical methods, and biochemical methods, but all of them have more or less defects that do not meet the requirements of sustainable development. The main problems are low catalytic degradation efficiency, weak batch processing capacity, technical High application cost and secondary pollution in the treatment process. Therefore, research and development of a catalyst for sewage treatment technology with high efficiency, controllabl...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J21/06B01J37/34C02F1/72C02F1/30
Inventor 薛晨阳丑修建张文栋王红亮熊继军刘俊王慧娟
Owner ZHONGBEI UNIV
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