In this work, an eco-friendly, facile, and efficient method has been applied for CuO nanostructures (NSs) synthesis using ascorbic acid as capping agent. For surface morphology, FESEM analysis was applied to reveal nanostructure with ~100 nm length, and ~90 nm width morphology which was also supported by TEM images of CuO. Thus obtained CuO NSs resulted in an optical energy having ~1.36 eV band gap obtained from Tauc plots of UV–visible plots because of strong quantum confinement effect of nanoparticles. XRD reveals a monoclinic phase of CuO NSs for which follow the reference JCPDS No. 98–004–3179 (Space group of C 12/c 1) crystal structure with high crystallinity of ~95.94% and crystallite size of ~38 nm. In addition, Williamson-Hall analysis was applied to calculate crystal lattice strain of ~3.01 × 10^-3 for CuO catalyst followed by 28.36 m²/g high BET surface area (0.9999 correlation coefficient) having ~14.38 nm average BJH pore size. Furthermore, CuO NSs exhibited ultrafast and high catalytic degradation efficiency of ~90.54% for Allura Red AC dye (AR dye) in 480 s under UV light. The photodegradation kinetics followed a pseudo first-order reaction with rate constant (k) of ~0.0046 s⁻¹ having approximately ~150.65 s of half-life (t_1/2) for AR dyes in the aquatic medium as per the Langmuir–Hinshelwood model. As synthesized catalyst, CuO NSs explored good leaf-like morphology with high recycling ability after five degradation cycles of AR dye in aqueous medium.

在这项工作中，以抗坏血酸作为封端剂，采用了一种环保、简便、高效的方法合成 CuO 纳米结构 (NSs)。对于表面形态，FESEM 分析用于揭示具有~100 nm 长度和~90 nm 宽度形态的纳米结构，这也得到了 CuO 的 TEM 图像的支持。由于纳米粒子的强量子限制效应，因此获得的 CuO NSs 导致具有 ~1.36 eV 带隙的光能，从紫外-可见光图的 Tauc 图中获得。XRD 揭示了 CuO NSs 的单斜相，其遵循参考 JCPDS No. 98-004-3179（C 12/c 1 空间群）晶体结构，具有~95.94% 的高结晶度和~38 nm 的微晶尺寸。此外，应用威廉姆森-霍尔分析来计算~3.01 × 10 ^{-3 的}晶格应变对于 CuO 催化剂，其后是 28.36 m ² /g 的高 BET 表面积（0.9999 相关系数），平均 BJH 孔径约为 14.38 nm。此外，在紫外光下，CuO NSs 在 480 秒内对诱惑红 AC 染料（AR 染料）表现出超快和高催化降解效率约 90.54%。根据Langmuir-Hinshelwood ，光降解动力学遵循具有~0.0046 s ^-1速率常数（k）的伪一级反应，具有约~150.65 s的水介质中 AR 染料的半衰期（t _1/2）模型。作为合成催化剂，CuO NSs 在 AR 染料在水性介质中经过 5 次降解循环后，探索出良好的叶状形态和高回收能力。