Method for preparing black titanium dioxide by low-temperature liquid-phase hydrothermal reduction method

The invention discloses a method for preparing black titanium dioxide through a low-temperature liquid-phase hydrothermal reduction method, and belongs to the technical field of photocatalysis. In order to prepare black titanium with excellent performance under mild conditions, the invention provides the method for preparing black titanium dioxide by a low-temperature liquid-phase hydrothermal reduction method. The disclosed method comprises the following steps: mixing orthotitanic acid gel with a reducing agent, adding a NaOH solution into the mixture until the pH value of the system is 9-12,uniformly stirring the mixture, and carrying out a hydrothermal reaction; and washing and drying a sample after the hydrothermal reaction to obtain black titanium dioxide. Tetrabutyl titanate is usedas a raw material, glacial acetic acid is added to inhibit hydrolysis of tetrabutyl titanate to prepare the orthotitanic acid gel; hydrazine hydrate and other reducing agents are added, the pH of thesystem is controlled, a hy