Saleh Rosari, Djaja Nadia Febiana
Departemen Fisika, Fakultas MIPA, Universitas Indonesia, 16424 Depok, Indonesia.
Departemen Fisika, Fakultas MIPA, Universitas Indonesia, 16424 Depok, Indonesia.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Sep 15;130:581-90. doi: 10.1016/j.saa.2014.03.089. Epub 2014 Apr 2.
ZnO nanoparticles doped with transition metals (Mn and Co) were prepared by a co-precipitation method. The synthesized nanoparticles were characterized using X-ray diffraction, scanning electron microscopy, energy dispersive X-rays, Fourier transform infrared spectroscopy, electron spin resonance spectroscopy and diffuse reflectance spectroscopy. The photocatalytic activities of the transition-metal-doped ZnO nanoparticles were evaluated in the degradation of methyl orange under UV irradiation. ZnO nanoparticles doped with 12 at.% of Mn and Co ions exhibited the maximum photodegradation efficiency. The experiment also demonstrated that the photodegradation efficiency of Mn-doped ZnO nanoparticles was higher than that of Co-doped ZnO nanoparticles. These results indicate that charge trapping states due to the doping were the decisive factor rather than the average particle size and energy gap. Moreover the effect of pH values on the degradation efficiency was discussed in the photocatalytic experiments using 12 at.% Mn- and Co-doped ZnO nanoparticles.
采用共沉淀法制备了掺杂过渡金属（锰和钴）的氧化锌纳米颗粒。使用X射线衍射、扫描电子显微镜、能量色散X射线、傅里叶变换红外光谱、电子自旋共振光谱和漫反射光谱对合成的纳米颗粒进行了表征。在紫外光照射下，通过甲基橙的降解评估了过渡金属掺杂氧化锌纳米颗粒的光催化活性。掺杂12原子百分比的锰和钴离子的氧化锌纳米颗粒表现出最大的光降解效率。实验还表明，锰掺杂氧化锌纳米颗粒的光降解效率高于钴掺杂氧化锌纳米颗粒。这些结果表明，掺杂引起的电荷俘获态是决定性因素，而不是平均粒径和能隙。此外，在使用12原子百分比锰和钴掺杂氧化锌纳米颗粒的光催化实验中，讨论了pH值对降解效率的影响。
