Process for preparing cationic nanotube array intermingling titanium oxide

The invention relates to a preparation technique of cation-doped titanium oxide nanotube arrays, in particular to a method of acquiring cation-doped titanium oxide nanotube arrays that have high photo-catalytic activity in situ on a titanium alloy matrix through electrochemistry and anodic oxidation process, and doped titanium oxide nanotube on atomic scale is acquired. Titanium alloy with homogeneous component is obtained by melting process, and the titanium alloy is adopted as matrix for anodic oxidation, so as to acquire titanium oxide nanotube arrays that are evenly doped with one kind or a plurality kinds of cations; by controlling content of alloying elements, titanium oxide nanotube with controllable doping amount and doped atomic scale can be acquired, and the diameter of electronic structure of the titanium oxide nanotube can be regulated, thus further improving solar rays performance of the titanium oxide nanotube in photocatalysis, and the titanium oxide nanotube arrays can hopefully be applied in hydrogen production from water by photodecomposition.