Preparation method of high-dispersity g-C3N4/TiO2 photocatalyst inorganic hydrosol

Abstract

The invention discloses a preparation method of high-dispersity g-C3N4 / TiO2 photocatalyst inorganic hydrosol and belongs to the field of functional materials. The method comprises the following steps of: adding a g-C3N4 / TiO2 photocatalyst into a water solution containing an inorganic dispersant according to a certain ratio under a stirring condition; adding a small amount of peptizing agent and adjusting the pH (Potential of Hydrogen) value of a suspension solution; and carrying out shear emulsifying and stirring treatment to obtain the stable high-dispersity g-C3N4 / TiO2 photocatalyst neutral inorganic hydrosol. A preparation process has a simple flow and is simple and convenient to operate; an organic dispersant and a solvent are not used and the preparation cost is low; the prepared photocatalyst hydrosol has high dispersity and stability and is suitable for preparing photocatalyst slurry and a coating agent; the application of the photocatalyst to the field of a coating material is facilitated.

Description

technical field [0001] The invention relates to a stable and highly dispersed nano g-C 3 N 4 / TiO 2 Preparation method of photocatalyst inorganic hydrosol. It belongs to the field of building coating materials. Background technique [0002] Nano-TiO 2 Due to the unique surface effect, small size effect, quantum effect and macroscopic quantum tunneling effect, it exhibits unique photoelectric properties. Its chemical properties are stable, non-toxic and cheap, and its unique color effect, photocatalysis and ultraviolet shielding functions make it have broad application prospects in coatings, cosmetics, wastewater treatment, sterilization and environmental protection. But nano TiO 2 Due to its large specific surface area and high surface energy, it is easy to agglomerate particles during use, which seriously affects its application. Therefore, seeking an effective dispersion method is to overcome the nano-TiO 2 The key to particle agglomeration and expanding applicatio...

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Problems solved by technology

[0003] Currently, TiO 2 Hydrosol mainly has two problems, (1) TiO 2 Without doping modification, it can only be excited by ultraviolet rays to produce a self-cleaning effect, and it is difficult to use a large amount of visible light in sunlight; (2) The sol preparation mainly uses organic titanium sources: butyl titanate, titanium isopropoxide, etc., through Preparation of sol by hydrolysis

The cost of raw materials is high, easy to decompose and degas after film formation, and the reaction time is long. The preparation efficiency is low, and the organic solvent is also harmful to the human body and the environment. Direct coating of TiO 2 Acidic sols can cause damage to cement substrates

The present invention utilizes graphite phase carbon nitride (g-C) prepared at low cost 3 N 4 ) and commercial nano-TiO 2 As raw materials, g-C with visible light activity was prepared by mechanochemical method 3 N 4 / TiO 2 Photocatalyst, and on this basis prepare a kind of highly dispersed g-C 3 N 4 / TiO 2 The near-neutral inorganic hydrosol of photocatalyst provides a good solution to the above problems, and there is no relevant literature report so far.

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