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Great efforts have been devoted to improve the photocatalytic activity of TiO2 in the visible light region.Rational design of the extemal structure and adjustment of intrinsic electronic status by impurity doping are two main effective ways to achieve this Purpose.A facile onepot synthetic approach was developed to prepare C-doped hollow TiO2 spheres,which simultaneously realized these advantages.The synthesized TiO2 exhibits a mesoporous hollow spherical structure composed of fine nanocrystals,leading to high specific surface area (～ 180 m2/g) and versatile porous texture.Carbonate-doping was achieved by a postthermal treatment at a relatively low temperature (200C),which makes the absorption edge red-shifted to the visible region of the solar spectrum.Concomitantly,Ti3+ induced by C-doping also functions in improving the visible-light photocatalytic activity by reducing the band gap.There exists a synergistic effect from multiple stimulatives to enhance the photocatalytic effect of the prepared TiO2 catalyst.It is not out of expectation that the asprepared C-doped hollow TiO2 spheres exhibits an improved photocatalytic activity under visible light irradiation in organic pollutant degradation.