Neodymium-doped Zn–Al layered double hydroxide (Nd/Zn-Al LDH) with excellent photocatalytic activity was prepared by a one-step hydrothermal method. The morphology and physicochemical properties of as-synthesized photocatalysts were well analyzed by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL), UV-diffuse reflectance spectroscopy (UV-DRS), and Brunauer-Emmett-Teller (BET) surface analysis. Doping Nd³⁺ into Zn–Al LDH enhances the overall catalytic activity of the nanocomposite, like better electron–hole pair separation, increase in interplanar distance, fast electron transfer, and large surface area. The as-prepared nanocomposite shows excellent degradation of three different dyes under visible light irradiation. The degradation efficiency of these dyes follows the order of Congo red > rose Bengal > fast green. Furthermore, liquid chromatography-mass spectrometry (LC-MS) was employed to propose a possible photocatalytic degradation pathway for Congo Red and Rose Bengal dyes by Nd/Zn–Al LDH. With the help of radical trapping experiments, it is revealed that during the photoexcitation process, the primary reactive intermediates are hydroxyl radicals.

采用一步水热法制备了具有优异光催化活性的钕掺杂Zn-Al层状双氢氧化物（Nd/Zn-Al LDH）。通过傅里叶变换红外 (FT-IR)、X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、光致发光 (PL)、紫外漫反射光谱 (UV-DRS) 和 Brunauer-Emmett-Teller (BET) 表面分析。掺杂Nd ³⁺加入 Zn-Al LDH 提高了纳米复合材料的整体催化活性，如更好的电子-空穴对分离、增加的晶面间距、快速的电子转移和大的表面积。所制备的纳米复合材料在可见光照射下显示出三种不同染料的良好降解。这些染料的降解效率依次为刚果红>玫瑰红>固绿。此外，采用液相色谱-质谱（LC-MS）提出了一种可能的 Nd/Zn-Al LDH 光催化降解刚果红和玫瑰红染料的途径。在自由基捕获实验的帮助下，揭示了在光激发过程中，主要的反应中间体是羟基自由基。