In this study, a new efficient adsorbent of Co-Fe-layered double hydroxides@metal-organic framework (Co-Fe-LDH@UiO-66-NH₂) was synthesized and used for extraction of methylene blue (MB) and methylene red (MR) from water samples prior to their determination by UV–Vis spectrophotometer. The adsorbent was characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray (EDX), X-ray Diffraction (XRD), and Brunauer-Emmett-Teller (BET) analyses. The impact of various parameters such as pH of the aqueous phase, extraction time, amount of adsorbent, type and volume of eluent solvent, desorption time, and sample volume were studied. The maximum extraction recovery was obtained at an optimized pH 8.0 and extraction time 10.0 min. The adsorption process was fitted by the Langmuir model with a maximum adsorption capacity of 555.62 mg/g and 588.2 mg/g, respectively, for MB and MR. Under optimum conditions, the limit of detection (LOD) for MB was 0.7 μgL⁻¹ and 0.9 μgL⁻¹ for MR. Furthermore, the Co-Fe-LDH@UiO-66-NH₂ composite showed high efficiency for the removal of the analytes from environmental water samples.

在这项研究中，一种新型的钴-铁层状双氢氧化物@金属-有机骨架的高效吸附剂（Co-Fe-LDH @ UiO-66-NH ₂）合成后，用UV-Vis分光光度计测定水样中的亚甲基蓝（MB）和亚甲基红（MR）。吸附剂的特征在于傅立叶变换红外光谱（FT-IR），扫描电子显微镜（SEM），能量色散X射线（EDX），X射线衍射（XRD）和Brunauer-Emmett-Teller（BET）分析。研究了各种参数的影响，例如水相的pH，萃取时间，吸附剂的量，洗脱剂溶剂的类型和体积，脱附时间和样品量。在优化的pH 8.0和10.0分钟的萃取时间下可获得最大的萃取回收率。Langmuir模型拟合的吸附过程对MB和MR的最大吸附容量分别为555.62 mg / g和588.2 mg / g。在最佳条件下MR为^-1和0.9μgL ^-1。此外，Co-Fe-LDH @ UiO-66-NH ₂复合材料显示出从环境水样品中去除分析物的高效率。