Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan 430074, PR China.
ACS Appl Mater Interfaces. 2012 Mar;4(3):1813-21. doi: 10.1021/am3000903. Epub 2012 Mar 12.
CdS and Ni-doped CdS hollow spheres were synthesized via a simple template-free one-pot method. The products were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, energy-dispersive spectroscopy analysis, X-ray photoelectron spectroscopy, and UV-vis absorption spectroscopy. The formation mechanism for the Ni-doped CdS hollow spheres was discussed. The prepared CdS and Ni-doped CdS hollow spheres showed the superior photocatalytic activity for the degradation of RhB under visible light (λ > 420 nm) irradiation, and 1.2 mol % Ni-doped CdS hollow spheres were found to be highly efficient for organic pollutants RhB and phenol removal. Moreover, this catalyst showed improved stability, and the activity did not decrease significantly after four recycles. The unique hollow spheres structure may favor the harvesting of exciting light due to multiple scattering within the interior space, and the doping of Ni(2+) may facilitate the generation of electrons and holes pairs and inhibit their recombination rate by act as a temporary trapping sites of photoinduced electrons.
CdS 和 Ni 掺杂的 CdS 空心球通过简单的无模板一锅法合成。通过 X 射线粉末衍射、扫描电子显微镜、透射电子显微镜、高分辨率透射电子显微镜、能谱分析、X 射线光电子能谱和紫外可见吸收光谱对产物进行了表征。讨论了 Ni 掺杂 CdS 空心球的形成机理。所制备的 CdS 和 Ni 掺杂的 CdS 空心球在可见光（λ>420nm）照射下对 RhB 的降解表现出优异的光催化活性，并且 1.2mol%的 Ni 掺杂的 CdS 空心球对有机污染物 RhB 和苯酚的去除具有高效性。此外，该催化剂表现出良好的稳定性，经过四次循环后，活性没有明显下降。独特的空心球结构由于内部空间的多次散射有利于收集激发光，而 Ni(2+)的掺杂可能通过充当光生电子的临时捕获位点来促进电子和空穴对的产生，并抑制它们的复合速率。
