The present study focuses on the synthesis, characterization, and testing of chromium-doped cobalt oxide (Co₃O₄) nanoparticles (NPs) for photochemical degradation at pH 8, 10, and 12. Transition metal oxides and their composites have excellent photocatalytic behavior and other attractive properties such as non-toxicity and stability, for a sustainable solution to environmental remediation spinel-type chromium-doped cobalt oxide (Cr: Co₃O₄) nanoparticles. Due to this action, a lucid co-precipitation technique was used to coin Cr:Co₃O₄ nanoparticles at different pH settings ranging from 8, 10, and 12. Samples were synthesized in an array to subject its structural and optical prospects and the spinel-type Cr:Co₃O₄ were examined by X-ray diffractometer, the crystallite size and structure were calculated by the Scherrer formula, and FESEM examination visualizes homogenous spherical shape. The frequency range of 400–4000 cm⁻¹ was revealed by FTIR, which was induced by stretching vibrations at the A- and B-sites, respectively. FTIR data were used to derive elastic moduli such as stiffness constants, Young's modulus, rigidity modulus, bulk modulus, and Debye temperature. The optical band gap value measured from Tauc plots was shown to decrease and the magnetic behavior of VSM changed from paramagnetic to ferromagnetic with increasing pH concentration. The dielectric constant and loss was estimated and the dielectric constant decreased on increasing frequency was observed. Relevance of the produced Cr–Co₃O₄ (pH = 8, 10, and 12) in the photocatalytic activity of Methylene blue (MB) dye degradation was investigated, and this improved photocatalytic performance is attributable to the efficient decrease of electron–hole recombination by the Cr–Co₃O₄ NPs.

本研究的重点是合成、表征和测试掺铬氧化钴 (Co ₃ O ₄ ) 纳米粒子 (NPs)，用于在 pH 8、10 和 12 下进行光化学降解。过渡金属氧化物及其复合材料具有优异的光催化性能以及其他吸引人的特性，例如无毒和稳定性，为环境修复尖晶石型铬掺杂氧化钴（Cr：Co ₃ O ₄）纳米粒子的可持续解决方案。由于这一作用，使用了一种清晰的共沉淀技术来铸造 Cr:Co ₃ O ₄8、10 和 12 的不同 pH 设置下的纳米粒子。以阵列形式合成样品以考察其结构和光学前景，并通过 X 射线衍射仪检查尖晶石型 Cr:Co ₃ O ₄、微晶尺寸和结构由谢勒公式计算，FESEM 检查显示均匀的球形。400-4000 cm ^-1的频率范围FTIR 揭示了 FTIR，这分别是由 A 位和 B 位的伸缩振动引起的。FTIR 数据用于推导弹性模量，例如刚度常数、杨氏模量、刚度模量、体积模量和德拜温度。从 Tauc 图中测量的光学带隙值显示出随着 pH 浓度的增加而降低，并且 VSM 的磁性行为从顺磁性变为铁磁性。估计介电常数和损耗，观察到介电常数随频率增加而降低。产生的 Cr-Co ₃ O _{4 的相关性}(pH = 8、10 和 12) 对亚甲蓝 (MB) 染料降解的光催化活性进行了研究，这种改进的光催化性能归因于 Cr-Co ₃ O ₄ NPs有效减少电子 - 空穴复合.