Abstract Metal-organic frameworks (MOFs) are traditional porous materials considered as efficient and low-cost for the removal of organic dyes from polluted water. In this study, we report a new type of hierarchical porous zeolitic imidazole frameworks −67@ layered double hydroxide (ZIF-67@LDH) consisting of nanocubes decorated with nanosheets. The prepared ZIF-67@LDH contains versatile functionalities which exhibit superior adsorption efficiency and adsorption rate for Methyl Orange (MO) and Alizarine Red S (ARS). The influence of pH, temperature, and contact time were analyzed in detail. The kinetics study revealed that the adsorption of MO and ARS over ZIF-67@LDH followed pseudo-second order (PSO) kinetic model, and adsorption isotherms were best described by the Langmuir isotherm model. Adsorption isotherms confirm the monolayer adsorption of MO and ARS over ZIF-67@LDH. The prepared material also shows outstanding recyclability with negligible loss. Thus ZIF-67@LDH presented a promising candidate for treating MO and ARS containing wastewater.

中文翻译：

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用于高效吸附甲基橙和茜素红 S 水溶液的分层介孔 ZIF-67@LDH。

摘要 金属有机框架（MOFs）是传统的多孔材料，被认为是去除污水中有机染料的有效且低成本的材料。在这项研究中，我们报告了一种新型分层多孔沸石咪唑骨架 -67@ 层状双氢氧化物（ZIF-67@LDH），由纳米片装饰的纳米立方体组成。制备的 ZIF-67@LDH 具有多种功能，对甲基橙 (MO) 和茜素红 S (ARS) 表现出优异的吸附效率和吸附率。详细分析了pH、温度和接触时间的影响。动力学研究表明，MO和ARS在ZIF-67@LDH上的吸附遵循准二级（PSO）动力学模型，并且吸附等温线最好由Langmuir等温线模型描述。吸附等温线证实了 MO 和 ARS 在 ZIF-67@LDH 上的单层吸附。制备的材料还显示出出色的可回收性，损失可忽略不计。因此，ZIF-67@LDH 为处理含 MO 和 ARS 的废水提供了一个有希望的候选者。