Remarkable efforts have been then devoted to the synthesis of single-walled CNT (SWCNT), multi-walled CNT (MWCNT)/TiO2 (TNP) composites, used for the treatment of wastewater containing pollutants, for sensors, for dye-sensitized solar cells, etc [15–20]. However, the photocatalytic decomposition efficiency was still insufficient for commercial applications, due to the low surface area of TiO2 and thus low adsorption capacity.