Chemistry Department, Faculty of Science, Al-Azhar University, Cairo, Egypt.
Botany and Microbiology Department, Faculty of Science, Al-Azhar University, Cairo, Egypt.
Carbohydr Polym. 2020 Feb 15;230:115711. doi: 10.1016/j.carbpol.2019.115711. Epub 2019 Dec 6.
Cellulose nanocrystal (CNC) and ZnO/CuO nanostructure were successfully synthesized by acid hydrolysis and sol-chemical methods, respectively. For the first time, CNC was used as a host polymer for synthesis of CNC/ZnO/CuO through In-situ solution casting technique. Morphological and structural of CNC, ZnO/CuO and hybrid CNC/ZnO/CuO were investigated by TEM, SEM-EDX, FT-IR, XRD and XPS analyses. The analysis revealed that, poly-dispersed, smooth and rod like CNC with an average length of ∼ 85.4 nm, average diameter of ∼13.9 nm and surface charge of 0.01 mmol/gm. As well, irregular shapes as hexagonal, spherical and cluster or star like of ZnO/CuO were formed. EDX and XRD spectra exhibited highly purified CNC/ZnO/CuO and pointed to cellulose II crystallite form with a monoclinic structure. The results demonstrated that, 91.3 % and 99.7 % dye degradation was achieved after 40 min of irradiation due to ZnO/CuO and CNC/ZnO/CuO treatment. Moreover, the inhibition zones formed due to 100 ppm ZnO/CuO were duplicated after integrating CNC (from 7.7:10.3 mm to 14.3:20.3 mm). The hybrid nanostructure exhibit larvicidal activity against Anopheles stephensi better than CNC and ZnO/CuO nanostructures.
纤维素纳米晶（CNC）和 ZnO/CuO 纳米结构分别通过酸水解和溶胶-化学方法成功合成。首次将 CNC 用作通过原位溶液浇铸技术合成 CNC/ZnO/CuO 的主体聚合物。通过 TEM、SEM-EDX、FT-IR、XRD 和 XPS 分析研究了 CNC、ZnO/CuO 和混合 CNC/ZnO/CuO 的形态和结构。分析表明，聚分散、光滑和棒状的 CNC 平均长度约为 85.4nm，平均直径约为 13.9nm，表面电荷为 0.01mmol/gm。同样，形成了不规则形状的六边形、球形和簇状或星状 ZnO/CuO。EDX 和 XRD 光谱显示出高度纯化的 CNC/ZnO/CuO，并指出纤维素 II 具有单斜结构的晶型。结果表明，由于 ZnO/CuO 和 CNC/ZnO/CuO 的处理，在照射 40 分钟后，染料降解率达到了 91.3%和 99.7%。此外，在整合 CNC 后，100ppm ZnO/CuO 形成的抑制区扩大了一倍（从 7.7:10.3mm 变为 14.3:20.3mm）。与 CNC 和 ZnO/CuO 纳米结构相比，混合纳米结构对疟蚊具有更好的杀幼虫活性。
