Novel high-efficiency visible-light-sensitive Nd-doped Cd Te nanoparticles were prepared with various doping concentrations of neodymium ion by a facile hydrothermal method. The reaction products were analyzed via X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), photoelectron spectroscopy(XPS), and UV-Vis diffuse reflectance spectroscopy techniques. Red shift was seen in the absorption band edge peak in the UV-Vis absorbance spectrum with increasing Nd content. The XRD and XPS results confirmed that Nd ions successfully replaced Cd atoms and were incorporated into the crystal lattice of Cd Te. SEM and TEM images indicated spherical structure and high crystallinity. Even at a very low Nd/Cd Te molar ratio of 2 mol.%, Nd doping could greatly enhance the photocatalytic activity of Cd Te. The photocatalytic activity of Nd-doped Cd Te nanoparticles was evaluated by monitoring the decolorization of RRed 43 in aqueous solution under visible-light irradiation. The color removal efficiency of Nd0.08Cd0.92 Te and pure Cd Te were 83.14% and 14.32% after 100 min of treatment, respectively. Among different amounts of the doping agent, 8 mol.% Nd indicated the highest decolorization. The presence of radical scavengers such as Cl-, CO32-, SO42-, and buthanol was found to reduce the decolorization efficiency. Novel high-efficiency visible-light-sensitive Cd-doped Cd Te nanoparticles were prepared with various doping concentrations of neodymium ion by a facile hydrothermal method. The reaction products were analyzed via X-ray diffraction (XRD) , transmission electron microscopy (TEM), photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance spectroscopy techniques. Red shift was seen in the absorption band edge peak in the UV-Vis absorbance spectrum with increasing Nd content. The XRD and XPS results confirmed that Nd ions successfully replaced Cd atoms and were incorporated into the crystal lattice of Cd Te. SEM and TEM images showed spherical structure and high crystallinity. Even at a very low Nd / Cd Te molar ratio of 2 mol.%, Nd doping could greatly enhance the photocatalytic activity of Cd Te. The photocatalytic activity of Nd-doped Cd Te nanoparticles was evaluated by monitoring the decolorization of RRed 43 in aqueous solution under visible-lig ht irradiation. The color removal efficiency of Nd 0.08Cd 0.92 Te and pure Cd Te were 83.14% and 14.32% after 100 min of treatment, respectively. All different amounts of the doping agent, 8 mol.% Nd indicated the highest decolorization. The presence of radical scavengers such as Cl-, CO32-, SO42-, and buthanol was found to reduce the decolorization efficiency.