Mittal Manish, Sharma Manoj, Pandey O P
J Nanosci Nanotechnol. 2014 Apr;14(4):2725-33. doi: 10.1166/jnn.2014.8615.
Mn (0.5%, 1%, 1.5% and 2%) doped and undoped ZnO nanoparticles (NPs) capped with PVP (1.0%) were successfully synthesized via co-precipitation approach using zinc acetate, sodium hydroxide and manganese acetate as precursors. Structural analysis was performed by XRD confirming phase purity and crystalline wurtzite structure. TEM results show average particle size 15-20 nm and 22-25 nm for Mn (1%) and Mn (2%) doped ZnO NPs respectively. Manganese (Mn) doping has led to reduction in band gap which facilitate the absorption of radiation in visible region. The Photocatalytic activity of undoped and Mn (0.5%,1%,1.5% and 2%) doped NPs was analyzed via degradation of crystal violet (CV) dye. The crystal violet decomposition rate of undoped and Mn doped NPs were studied under UV-visible region. It is observed from degradation studies that the doping has a pronounced effect on the photocatalytic activity of ZnO NPs. Kinetic studies shows that photo degradation of CV follow a pseudo first-order kinetic law. Experiments for reusability of Mn (1%) doped with PVP (1%) capped ZnO were also performed to determine the stability of as prepared sample. It shows an increase in catalytic activity of NPs by small amount when exposed to UV irradiation for 3 h. Photoluminescence and UV-Visible absorption spectroscopy studies were also performed for studying the effect of UV irradiation on the surface of ZnO NPs.
通过共沉淀法，以醋酸锌、氢氧化钠和醋酸锰为前驱体，成功合成了用1.0%聚乙烯吡咯烷酮（PVP）包覆的Mn（0.5%、1%、1.5%和2%）掺杂及未掺杂的氧化锌纳米颗粒（NPs）。通过X射线衍射（XRD）进行结构分析，证实了相纯度和纤锌矿晶体结构。透射电子显微镜（TEM）结果显示，Mn（1%）和Mn（2%）掺杂的ZnO NPs的平均粒径分别为15 - 20纳米和22 - 25纳米。锰（Mn）掺杂导致带隙减小，有利于在可见光区域吸收辐射。通过结晶紫（CV）染料的降解分析了未掺杂和Mn（0.5%、1%、1.5%和2%）掺杂的NPs的光催化活性。在紫外 - 可见区域研究了未掺杂和Mn掺杂的NPs的结晶紫分解速率。从降解研究中观察到，掺杂对ZnO NPs的光催化活性有显著影响。动力学研究表明，CV的光降解遵循准一级动力学规律。还进行了用1%PVP包覆的Mn（1%）掺杂的ZnO的可重复使用性实验，以确定所制备样品的稳定性。结果表明，当暴露于紫外光照射3小时时，NPs的催化活性略有增加。还进行了光致发光和紫外 - 可见吸收光谱研究，以研究紫外照射对ZnO NPs表面的影响。
