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Salicylic acid surface modified nano-tio2 magnetic composite material and preparation method

A magnetic composite material and surface modification technology, applied in the field of nanomaterials, can solve the problems of poor heavy metal ion adsorption capacity, inability to utilize visible light, difficult catalyst separation, etc., to enhance visible light photocatalysis and adsorption capacity, avoid adverse effects, high The effect of permeability

Inactive Publication Date: 2019-02-01
MINNAN NORMAL UNIV
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Problems solved by technology

[0006] The object of the present invention is to provide a kind of salicylic acid surface modification nano-TiO 2 The magnetic composite material and its preparation method aim to solve the difficulty of catalyst separation, difficulty in recycling and easy to cause secondary environmental effects. The catalyst can only respond to ultraviolet photocatalysis and cannot use visible light. TiO 2 Easy recombination of electron-hole pairs during photocatalysis, TiO 2 Small specific surface area, weak adsorption capacity, poor interfacial compatibility in nanopowder medium, TiO 2 There are few surface groups, and the problem of defects with poor adsorption capacity of pollutants, especially heavy metal ions

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  • Salicylic acid surface modified nano-tio2 magnetic composite material and preparation method

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preparation example Construction

[0039] Such as figure 1 Shown, the salicylic acid surface modification nano-TiO of the embodiment of the present invention 2 The preparation method of magnetic composite material comprises the following steps:

[0040] S101: Weigh a certain amount of FeSO 4 ·7H 2 O and NiCl 2 ·6H 2 O and KBH 4 , respectively dissolved in a certain volume of ethanol-water mixed system, under the protection of nitrogen, mixed and stirred, the KBH 4 The solution was quickly added dropwise to the above system, stirred, separated, vacuum filtered, and the black product was dried to obtain a nano-Fe / Ni alloy, which was filled with nitrogen and sealed for storage for later use;

[0041] S102: Weigh a certain amount of Fe / Ni, add a certain amount of ethanol-water mixed system, and prepare SiO by coating method 2 @Fe / Ni core-shell nanoparticles;

[0042] S103: Weigh a certain amount of SiO 2 @Fe / Ni, add 1ml n-tetrabutyl titanate and 35mL ethanol, ultrasonically disperse for about 10min, prepar...

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Abstract

The invention discloses a salicylic acid surface-modified nanometer TiO2 magnetic composite material and a preparation method. Fe / Ni bimetallic nanoparticles are prepared by a co-reductive deposition method; SiO2 is directly coated on the Fe / Ni magnetic core by a direct coating method. Gel precursor; using SiO2@Fe / Ni as template, using sol-gel method and surface modification technology to synthesize salicylic acid surface-modified magnetic bimetallic / SiO2 / TiO2 core-shell nanocomposite new photocatalytic material with good photocatalytic activity . The present invention uses Fe / Ni as the magnetic core, coats SiO2 and TiO2 layer by layer, and finally makes the TiO2 nanomaterial magnetically recyclable through surface modification, increases the specific surface area, and increases surface hydroxyl and other multiple groups to facilitate adsorption. Through surface modification It achieves its visible light response, and at the same time inhibits electron-hole pair recombination through Fe / Ni to synergistically enhance visible light photocatalysis and adsorption capabilities.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, in particular to a salicylic acid surface-modified nano-TiO 2 Magnetic composite material and preparation method. Background technique [0002] Environmental problems caused by aromatic pollutants (such as dyes and nitrophenols) have become a major issue affecting human survival and health in the 21st century. Such pollutants are highly toxic and difficult to degrade, and can also produce "three-cause" effects (carcinogenic, teratogenic, and mutagenic) and environmental hormone effects on animals and humans at low concentrations. Due to its stable structure and high toxicity, it is difficult to deal with existing pollution control technologies (such as biotechnology, physical and chemical methods). Arsenic is a common pollutant in water, and inorganic arsenic generally exists in two forms, As(Ⅲ) and As(V). The toxicity of As(Ⅲ) is about 60 times that of As(V), and the mobility of As(Ⅲ) i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J20/10B01J20/28B82Y30/00
CPCB01J20/103B82Y30/00B01J20/28009B01J23/755B01J35/39B01J35/33
Inventor 黄泱李顺兴张茂升林海彬
Owner MINNAN NORMAL UNIV
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