School of Science, Minzu University of China, Beijing, 100081, China; Department of Physics, COMSATS University Islamabad, Park Road, Chak Shahzad, Islamabad, 45550, Pakistan.
Department of Physics, COMSATS University Islamabad, Park Road, Chak Shahzad, Islamabad, 45550, Pakistan.
J Environ Manage. 2021 Sep 1;293:112854. doi: 10.1016/j.jenvman.2021.112854. Epub 2021 May 29.
The photocatalytic activity of pure MnO and silver (Ag) modified MnO nanoparticles have been investigated. The nanoparticles were prepared by using co-precipitation technique. The structural analysis showed that the Ag modified MnO was successfully synthesized. For instance, a slight shift to lower angle of XRD pattern was observed after Ag doping. Morphological analysis revealed that the particles have an average size of 274 nm, 287 nm and 321 nm for pure, 1% and 3% Ag modified MnO respectively. The UV-Visible analysis indicated that the bandgap of MnO decreased with increased Ag content and the band gap is 1.4 eV with the 3% of Ag content. The spectra obtained from DRS were also evaluated through inverse logarithmic derivative method (ILD) to counter check the bandgap values. 3% Ag-modified photocatalysts exhibited the enhanced decolorization efficiency compared to pure MnO nanoparticles. The pseudo first order kinetic model is used to explain the photocatalytic kinetics of the photocatalyst. The rate constant values are 0.01/min, 0.017/min and 0.024/min for pure MnO, 1% Ag and 3% Ag modified MnO nanoparticles, respectively.
我们研究了纯 MnO 和银（Ag）修饰的 MnO 纳米粒子的光催化活性。纳米粒子通过共沉淀技术制备。结构分析表明，Ag 修饰的 MnO 成功合成。例如，Ag 掺杂后，XRD 图谱的轻微偏移到较低的角度。形态分析表明，纯 MnO、1%Ag 修饰的 MnO 和 3%Ag 修饰的 MnO 的颗粒平均尺寸分别为 274nm、287nm 和 321nm。UV-可见分析表明，MnO 的能带隙随着 Ag 含量的增加而降低，当 Ag 含量为 3%时，带隙为 1.4eV。通过反对数导数法（ILD）对从 DRS 获得的光谱进行评估，以核对带隙值。与纯 MnO 纳米粒子相比，3%Ag 修饰的光催化剂表现出增强的脱色效率。采用准一级动力学模型解释光催化剂的光催化动力学。纯 MnO、1%Ag 和 3%Ag 修饰的 MnO 纳米粒子的速率常数值分别为 0.01/min、0.017/min 和 0.024/min。
