Iron oxide doped mixed crystal form titanium dioxide nano-net photocatalytic composite material

The invention provides an iron oxide doped mixed crystal form titanium dioxide nano-net photocatalytic composite material. A preparation method comprises the steps of placing a titanium mesh as an anode and a platinum sheet as a cathode in an electrolyte for an anodic oxidation reaction so that a titanium dioxide nano-mesh array of a titanium mesh substrate is obtained, placing the titanium dioxide nano-net array of the titanium net substrate in an ethanol solution dissolved with ferric chloride for dipping treatment, taking out the titanium dioxide nano-net array, drying the titanium dioxidenano-net array, and then carrying out heat treatment to obtain the ferric oxide doped mixed crystal form titanium dioxide nano-net photocatalytic composite material. An ethanol solution of ferric chloride is used as an iron source for doping, amorphous titanium dioxide does not fall off in ethanol, and ferric oxide is generated after a thermal reaction of ferric chloride. Iron oxide is deposited on the titanium dioxide na