In this paper, the hydrothermal method was utilized for the facile synthesis of copper chromite nanoparticles in the absence (abbreviated as CC1) and presence of citric acid (abbreviated as CC2) and tartaric acid (abbreviated as CC3) as templates. The synthesized nanoparticles were characterized using different tools such as XRD, FT-IR, UV–Vis, FE-SEM, HR-TEM, and BET. The average crystallite size of the CC1, CC2, and CC3 samples is 25.45, 20.26, and 12.75 nm, respectively. The FT-IR spectra show two bands in the range 613–616 cm⁻¹ and 511–514 cm⁻¹, which are characteristic of the spinel copper chromite crystalline structure. The optical energy gaps of the CC1, CC2, and CC3 samples are 1.25, 1.88, and 1.92 eV, respectively. The synthesized nanoparticles were used for the degradation of the acid orange 7 dye under visible light irradiations. The highest % degradation was obtained at pH 2.5 and irradiation time = 40 min. The % degradation of the acid orange 7 dye using CC1, CC2, and CC3 photocatalysts at pH 2.50 and time = 40 min is 87.38, 96.52, and 98.81, respectively. The degradation of the acid orange 7 dye was markedly reduced with the addition of isopropyl alcohol or disodium ethylenediaminetetraacetate, confirming that the hydroxyl radicals and holes routes play a fundamental role in the degradation process of the acid orange 7 dye. The degradation of the acid orange 7 dye is slightly affected by the addition of ascorbic acid, confirming a minor concentration of oxygen anion radicals.

本文采用水热法在柠檬酸（简称CC2）和酒石酸（简称CC3）作为模板不存在（简称CC1）和存在的情况下，简便地合成亚铬酸铜纳米颗粒。合成的纳米粒子使用不同的工具进行表征，如 XRD、FT-IR、UV-Vis、FE-SEM、HR-TEM 和 BET。CC1、CC2 和 CC3 样品的平均晶粒尺寸分别为 25.45、20.26 和 12.75 nm。FT-IR 光谱显示了 613-616 cm ^-1和 511-514 cm ^-1范围内的两个波段，这是尖晶石亚铬酸铜晶体结构的特征。CC1、CC2 和 CC3 样品的光能隙分别为 1.25、1.88 和 1.92 eV。合成的纳米颗粒用于在可见光照射下降解酸性橙 7 染料。在 pH 2.5 和辐照时间 = 40 分钟时获得最高的降解百分比。在 pH 2.50 和时间 = 40 分钟下，使用 CC1、CC2 和 CC3 光催化剂对酸性橙 7 染料的降解百分比分别为 87.38、96.52 和 98.81。加入异丙醇或乙二胺四乙酸二钠显着降低了酸性橙 7 染料的降解，证实羟基自由基和空穴路线在酸性橙 7 染料的降解过程中起重要作用。