Salicylic acid surface modified nano TiO2 magnetic composite material and preparation method

Abstract

The invention discloses a salicylic acid surface modified nano TiO2 magnetic composite material and a preparation method. The method includes: preparing Fe / Ni bimetallic nanoparticles by co-reduction deposition technique; coating Fe / Ni magnetic cores directly with an SiO2 gel precursor by direct coating technique; taking SiO2@Fe / Ni as the template, using sol-gel technique and a surface modification technology to synthesize the salicylic acid surface modified magnetic bimetallic / SiO2 / TiO2 core-shell nano composite photocatalytic new material. According to the invention, Fe / Ni is taken as the magnetic core, and is coated with SiO2 and TiO2 layer by layer, finally through surface modification, the TiO2 nano material can achieve magnetic recovery, the specific surface area is increased, the surface hydroxyl and other groups are increased to be conducive to adsorption, visible light response is realized through surface modification, at the same time Fe / Ni inhibits electron-hole pair compounding, thus synergetically enhancing visible light photocatalysis and adsorption capacity.

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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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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