Elimination of toxic dye, one of the utmost and usual industrial pollution released in the natural water, is the very serious issue for the modern civilization. In this study, a novel bimetallic (ZIF-8@ZIF-67) zeolitic imidazolate frameworks (ZIFs) have been fabricated by a simple and straight forward technique at room temperature. Sodalite (SOD) cage type structure, morphology and porosity of synthesized bimetallic metal-organic frameworks (MOFs) were characterized by SEM, TEM, XRD and BET. The results of characterizations showed that the ZIF-8@ZIF-67 owns greater nano crystallinity, surface area and porosity. As compared to single metallic MOFs (ZIF-67 and ZIF-8), the physical and chemical properties of ZIF-8@ZIF-67 were improved. Accordingly, the ZIF-8@ZIF-67 potentially analysed for the exclusion of rhodamine B from water and the gained outcomes were compared with the efficiency of mono-metallic MOFs (ZIF-67 and ZIF-8). Several parameters, including initial dye concentrations, sonication time, and pH on dye removal efficiency were investigated. Additionally, Langmuir, Freundlich, Tempkin and Dubinin-Radushkevich isotherm models were used to explain the process of adsorption onto the surface of MOFs. The results disclosed that the Langmuir model sufficiently explained the adsorption procedure as monolayer with higher R² values (R² = 0.9924, 0.9822 and 0.9909 of ZIF-67, ZIF-8 and ZIF-8@ZIF-67 respectively). The mean free energy (E) was observed to be 0.551, 0.576 and 0.532 KJ.mol⁻¹ for ZIF-67, ZIF-8 and ZIF-8@ZIF-67, respectively, exposing that the chemisorption dominates the process of adsorption. The q_max premeditated with Langmuir model was comparatively high (143.26 mg.g⁻¹) as compared to ZIF-8 (56.40 mg.g⁻¹) and ZIF-67 (81.63 mg.g⁻¹), accrediting to the intensification in active binding sites. Further, the reusability of bimetallic MOFs was tested for four regeneration cycles and results were outstanding with only 8 ±1% decrease in efficiency. It is assumed that, the fabricated ZIF-8@ZIF-67 composite have high applicability for the adsorption of toxic dyes from water.

消除有毒染料是天然水中最常见的工业污染之一，是现代文明面临的非常严峻的问题。在这项研究中，通过简单直接的技术在室温下制造了一种新型双金属 (ZIF-8@ZIF-67) 沸石咪唑骨架 (ZIF)。采用 SEM、TEM、XRD 和 BET 对合成的双金属金属有机骨架 (MOFs) 的方钠石 (SOD) 笼型结构、形貌和孔隙率进行了表征。表征结果表明，ZIF-8@ZIF-67具有较大的纳米结晶度、表面积和孔隙率。与单一金属 MOFs（ZIF-67 和 ZIF-8）相比，ZIF-8@ZIF-67 的物理和化学性能得到了改善。因此，ZIF-8@ZIF-67 可能被分析为排除将水中的罗丹明 B 和所得结果与单金属 MOF（ZIF-67 和 ZIF-8）的效率进行了比较。研究了几个参数，包括初始染料浓度、超声处理时间和 pH 值对染料去除效率的影响。此外，Langmuir、Freundlich、Tempkin 和 Dubinin-Radushkevich 等温线模型用于解释 MOF 表面的吸附过程。结果表明，Langmuir 模型充分解释了吸附过程为具有较高 R ²值的单分子层（ZIF-67、ZIF-8 和 ZIF-8@ZIF-67 的 R ²  = 0.9924、0.9822 和 0.9909）。观察到平均自由能 (E) 为 0.551、0.576 和 0.532 KJ.mol ^-1对于 ZIF-67、ZIF-8 和 ZIF-8@ZIF-67，分别表明化学吸附在吸附过程中占主导地位。^{与 ZIF-8 (56.40 mg.g -1} ) 和 ZIF-67 (81.63 mg.g ^-1 ) 相比，使用 Langmuir 模型预想的 q _max相对较高 (143.26 mg.g ^-1 )，这表明在活性结合位点。此外，对双金属 MOF 的可重复使用性进行了四个再生循环测试，结果非常出色，效率仅降低了 8 ±1%。假设制备的 ZIF-8@ZIF-67 复合材料对水中有毒染料的吸附具有很高的适用性。