Department of Chemistry, St. Xavier's College (Autonomous), Tirunelveli 627002, India; LIFE, Department of Chemistry, Loyola College (Autonomous), Chennai 600034, India.
UNESCO-UNISA Africa Chair in Nanoscience's/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa; Nanosciences African network (NANOAFNET), Materials Research Group (MRG), iThemba LABS-National Research Foundation (NRF), 1 Old Faure Road, 7129, P O Box722, Somerset West, Western Cape Province, South Africa.
J Photochem Photobiol B. 2017 Apr;169:110-123. doi: 10.1016/j.jphotobiol.2017.03.008. Epub 2017 Mar 9.
CeO/CdO multi-layered nanoplatelet arrays have been synthesized by sol-gel method at two different temperatures using Citrus limonum fruit extract and the effect of particle size on the photocatalytic performance is studied. The particle size and phases was analysed by X-ray diffraction pattern (XRD) which brought out the formation of cubic phase in the synthesized samples. Field Emission Scanning electron microscopy (FESEM) revealed the surface morphology and made up of cumulative form of platelet shaped arrays with an average size of 10nm. The elemental composition and the purity of the nanomaterials were confirmed by Energy Dispersive X-ray spectroscopy (EDX). CeO/CdO multilayered binary metal oxide nanoplatelet arrays were formed which was further explored with Fourier transform infrared spectroscopy (FTIR), it reveals that the nanocomposites contain CeO and CdO bonds. Determination of the direct and indirect bandgap energy of the nanoplatelet arrays was carried out by UV-Vis-DRS studies. In MG degradation, both the hole (h) and hydroxyl radical (OH) played a major role than the superoxide radical (O). Possible photo degradation mechanisms are proposed and discussed in this article. CeO/CdO multi-layered nanoplatelet arrays showed antibacterial activity and among the tested ones, it showed better growth inhibition towards P. aeruginosa MTCC73. Thus, this greener synthetic procedure was a highly effective method due to low-cost, highly effective UV light responsive material for environmental safety.
采用溶胶-凝胶法，以柠檬果实提取物为原料，在两种不同温度下合成了 CeO/CdO 多层纳米板阵列，并研究了粒径对光催化性能的影响。通过 X 射线衍射图（XRD）分析了粒径和相，得出了合成样品中立方相的形成。场发射扫描电子显微镜（FESEM）揭示了表面形态，由累积形式的板状阵列组成，平均尺寸为 10nm。通过能量色散 X 射线能谱（EDX）证实了纳米材料的元素组成和纯度。形成了 CeO/CdO 多层二元金属氧化物纳米板阵列，并用傅里叶变换红外光谱（FTIR）进一步研究，结果表明纳米复合材料含有 CeO 和 CdO 键。通过紫外-可见-漫反射光谱（UV-Vis-DRS）研究了纳米板阵列的直接和间接带隙能。在 MG 降解中，空穴（h）和羟基自由基（OH）比超氧自由基（O）发挥了更大的作用。本文提出并讨论了可能的光降解机制。CeO/CdO 多层纳米板阵列表现出抗菌活性，在测试的菌株中，对 P. aeruginosa MTCC73 的生长抑制作用更好。因此，这种绿色合成方法由于成本低、对高效紫外光响应的材料，是一种非常有效的方法，可用于环境安全。
