Preparation method of titanium dioxide-metal water-based nanometer composite sol

Abstract

The invention discloses a preparation method of titanium dioxide-metal water-based nanometer composite sol. The preparation method comprises the following steps: 1, dissolving metal salt in water to obtain a metal salt water solution, and reflowing the metal salt water solution by heating while adding a reducing agent water solution until a reflowing water solution system discolors for later use, wherein a mol ratio of the added reducing agent to metal ions is 1-50; 2, dissolving titanate in an aqueous solution of hydrogen peroxide to obtain an aqueous solution of titanium superoxide, regulating the pH value of the aqueous solution of titanium superoxide by virtue of an inorganic aqueous alkali solution; and 3, adding the aqueous solution of titanium superoxide prepared in the step 2 into the discolored metal salt water solution prepared in the step 1 to obtain a composite solution, and reflowing the composite solution by heating to obtain the final product. According to the preparation method disclosed by the invention, a metal-oxide composite structure can be effectively formed, and the process operability is high; the preparation method is suitable for batch preparation, and has a possibility of industrialized production and wide practicability.

Description

technical field [0001] The invention relates to the technical field of inorganic nano sols, in particular to the normal-pressure one-pot synthesis of titanium dioxide-metal water-based nano composite sols. Background technique [0002] Nano-TiO 2 As a functional inorganic material, it has broad application prospects in many fields such as coatings, photoelectric conversion, catalysis, functional ceramics, and antibacterial materials. Its synthesis and application research has always been the focus of research in the field of related functional materials. However, TiO 2 The forbidden band width of TiO is 3.2eV, and the corresponding absorption wavelength is 387.5nm. The light absorption is only limited to the ultraviolet region, but this part of the light only reaches 5% of the ground solar spectrum; moreover, TiO 2 The quantum efficiency does not exceed 20%, and the utilization rate of solar energy is only about 1%. Therefore, by TiO 2 The modification and recombination ...

AI Technical Summary

Problems solved by technology

However, the synthesis of sols reported in literature and patents usually uses metal organic compounds, such as the hydrolysis of tetrabutyl titanate in ethanol system. The main disadvantages of this method are that the precursors and solvents are expensive and the hydrolysis process uses a large amount of Environmental pollution caused by organic solvents; at the same time, since crystallized titanium dioxide cannot be directly obtained, subsequent high-temperature sintering is required, which limits the application range of substrate materials

In addition, the traditional step-by-step synthesis approach is easy to cause heterogeneous nucleation of metals or titanium dioxide, which cannot form an effective charge separation transfer system.

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