Research Laboratory of Polymer, Department of Organic and Biochemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
J. Mike Walker '66 Mechanical Engineering Department, Texas A&M University, College Station, TX, USA.
Sci Rep. 2023 Feb 27;13(1):3329. doi: 10.1038/s41598-023-28935-z.
In this study, we fabricated an economical, non-toxic, and convenient magnetic nanocomposite of CuFeO nanoparticles (NPs)/carbon quantum dots (CQDs) of citric acid via the co-precipitation method. Afterward, obtained magnetic nanocomposite was used as a nanocatalyst to reduce the ortho-nitroaniline (o-NA) and para-nitroaniline (p-NA) using a reducer agent of sodium borohydride (NaBH). To investigate the functional groups, crystallite, structure, morphology, and nanoparticle size of the prepared nanocomposite, FT-IR, XRD, TEM, BET, and SEM were employed. The catalytic performance of the nanocatalyst was experimentally evaluated based on the ultraviolet-visible absorbance to assess the reduction of o-NA and p-NA. The acquired outcomes illustrated that the prepared heterogeneous catalyst significantly enhanced the reduction of o-NA and p-NA substrates. The analysis of the absorption showed a remarkable decrease for ortho-NA and para-NA at λ = 415 nm in 27 s and λ = 380 nm in 8 s, respectively. The constant rate (k) of ortho-NA and para-NA at the stated λ was 8.39 × 10 s and 5.48 × 10 s. The most highlighted result of this work was that the CuFeO@CQD nanocomposite fabricated from citric acid performed better than absolute CuFeO NPs, since nanocomposite containing CQDs had a more significant impact than copper ferrite NPs.
在这项研究中，我们通过共沉淀法制备了一种经济、无毒且方便的 CuFeO 纳米粒子（NPs）/柠檬酸碳量子点（CQDs）磁性纳米复合材料。随后，将得到的磁性纳米复合材料用作纳米催化剂，使用还原剂硼氢化钠（NaBH）还原邻硝基苯胺（o-NA）和对硝基苯胺（p-NA）。为了研究所制备的纳米复合材料的功能基团、晶相、结构、形貌和纳米颗粒尺寸，采用了傅里叶变换红外光谱（FT-IR）、X 射线衍射（XRD）、透射电子显微镜（TEM）、比表面积和孔隙度分析仪（BET）和扫描电子显微镜（SEM）。通过紫外-可见吸收实验评估纳米催化剂的催化性能，以评估 o-NA 和 p-NA 的还原情况。实验结果表明，所制备的非均相催化剂显著提高了 o-NA 和 p-NA 底物的还原效率。吸收分析表明，在 λ=415nm 时，邻-NA 在 27s 内显著减少，在 λ=380nm 时，对-NA 在 8s 内显著减少。在指定 λ 下，邻-NA 和对-NA 的恒定速率（k）分别为 8.39×10-3s 和 5.48×10-3s。这项工作的最突出结果是，由柠檬酸制备的 CuFeO@CQD 纳米复合材料比绝对的 CuFeO NPs 表现更好，因为含有 CQDs 的纳米复合材料比铜铁氧体 NPs 具有更显著的影响。
