Institute of Physics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan.
School of Chemical & Materials Engineering (SCME), National University of Sciences and Technology (NUST), Islamabad, 24090, Pakistan.
Environ Sci Pollut Res Int. 2021 Aug;28(31):42243-42260. doi: 10.1007/s11356-021-13572-8. Epub 2021 Apr 2.
Novel tri-phase CuO-MgO-ZnO nanocomposite was prepared using the co-precipitation technique and investigated its physical properties using characterization techniques including XRD, FTIR, Raman, IV, UV-vis, PL, and SEM. The application of grown CuO-MgO-ZnO nanocomposite for the degradation of various dyes under sunlight and antibacterial activity against different bacteria were studied. The XRD confirmed the existence of diffraction peaks related to CuO (monoclinic), MgO (cubic), and ZnO (hexagonal) with CuO phase 40%, MgO 24%, and ZnO 36%. The optical energy gap of nanocomposite was 2.9 eV, which made it an efficient catalyst under sunlight. Raman and FTIR spectra have further confirmed the formation of the nanocomposite. SEM images revealed agglomerated rod-shaped morphology. EDX results showed the atomic percentage of a constituent element in this order Cu>Zn>Mg. PL results demonstrate the presence of intrinsic defects. The photocatalytic activity against methylene blue (MB), methyl orange (MO), rhodamine-B (RhB), cresol red (CR), and P-nitroaniline (P-Nitro) dyes has shown the excellent degradation efficiencies 88.5%, 93.5%, 75.9%, 98.8%, and 98.6% at 5 ppm dye concentration and 82.6%, 83.6%, 64.3%, 93.1%, and 94.3% at 10 ppm dye concentration in 100 min, respectively, under sunlight illumination. The higher degradation is due to the generation of superoxide and hydroxyl radicals. The recyclability test showed the reusability of catalyst up to the 5th cycle. The antibacterial activity against Escherichia coli, Klebsiella pneumoniae, Proteus Vulgaris, Staphylococcus aureus, and Pseudomonas aeruginosa bacteria with the zone of inhibition 30, 31, 30, 30, and 30 mm, respectively, was achieved.
新型三相 CuO-MgO-ZnO 纳米复合材料采用共沉淀技术制备，并通过 XRD、FTIR、拉曼、IV、UV-vis、PL 和 SEM 等表征技术研究其物理性能。研究了生长的 CuO-MgO-ZnO 纳米复合材料在阳光照射下对各种染料的降解应用和对不同细菌的抗菌活性。XRD 证实存在与 CuO（单斜）、MgO（立方）和 ZnO（六方）相关的衍射峰，其中 CuO 相为 40%、MgO 为 24%、ZnO 为 36%。纳米复合材料的光学能隙为 2.9eV，使其成为阳光下的高效催化剂。拉曼和 FTIR 光谱进一步证实了纳米复合材料的形成。SEM 图像显示出团聚的棒状形态。EDX 结果表明各组成元素的原子百分比顺序为 Cu>Zn>Mg。PL 结果表明存在本征缺陷。对亚甲基蓝（MB）、甲基橙（MO）、罗丹明-B（RhB）、间甲酚红（CR）和对硝基苯胺（P-Nitro）染料的光催化活性表明，在 5ppm 染料浓度下，分别在 100min 内达到 88.5%、93.5%、75.9%、98.8%和 98.6%的优异降解效率，在 10ppm 染料浓度下，分别达到 82.6%、83.6%、64.3%、93.1%和 94.3%的降解效率，分别在阳光照射下达到 82.6%、83.6%、64.3%、93.1%和 94.3%的降解效率。更高的降解归因于超氧自由基和羟基自由基的产生。循环使用测试表明催化剂可重复使用至第 5 次。对大肠杆菌、肺炎克雷伯菌、普通变形杆菌、金黄色葡萄球菌和铜绿假单胞菌的抗菌活性分别达到 30、31、30、30 和 30mm 的抑菌圈。
