Method for preparing carbon nanometer tube/titanium dioxide composite photocatalyst

A carbon nanotube modified TiO2 photocatalyst for catalytic decomposing of H2O to obtain H2 is prepared through dissolving nickel nitrate and butyl titanate in methanol, adding citric acid and ethanediol, heating, complex reaction, heating, polyesterifying to become transparent gel, pre-calcining, grinding, calcining, hydroreducing reaction, filling methane, and filling H2 to scavenge the carbon.