Soltani Roozbeh, Marjani Azam, Shirazian Saeed
Department of Chemistry, Arak Branch, Islamic Azad University, Arak, Iran.
Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam.
Dalton Trans. 2020 Apr 28;49(16):5323-5335. doi: 10.1039/d0dt00680g.
The design and development of an environmentally benign porous adsorbent for effective simultaneous adsorption of organic dyes and heavy metals from water are important but remain a big challenge. Herein, we have designed a layered double hydroxide/metal-organic framework-based hierarchical nanocomposite (LDH/MOF HNC) by a facile, room-temperature in situ approach. This paper for the first time reports a hierarchical trimodal micro-meso-macroporous LDH/MOF composite with a high surface area (surface area 1282 m2 g-1 and pore volume 0.93 cm3 g-1), synthesised by uniformly growing MOF nanocrystals on the surface of LDH nanosheet ultrathin films. An attempt is made to quantitatively demonstrate the adsorption data via suitable nonlinear kinetic and isotherm equations for single, simultaneous, and consecutive adsorption of the orange II reactive dye and Cr(vi). Experiments were performed at various values of pH (6.0-11.0), adsorbent dosages (1.0-8.0 mg), adsorbate concentrations (5-500 mg L-1), and temperatures (293-323 K). The Langmuir model revealed a satisfactory fit to the equilibrium data of the LDH/MOF HNC (correlation coefficients R2 > 0.98) with a calculated maximum adsorption capacity of 1173 and 733 mg g-1 for orange II and Cr(vi), respectively, in a simultaneous adsorption system. The results of the study demonstrated that LDH/MOF HNCs could potentially be applied as a promising nanoadsorbent for the simultaneous removal and extraction of toxic dyes and metals from water.
设计和开发一种环境友好型多孔吸附剂，用于从水中有效同时吸附有机染料和重金属，这很重要，但仍然是一个巨大的挑战。在此，我们通过一种简便的室温原位方法设计了一种基于层状双氢氧化物/金属有机框架的分级纳米复合材料（LDH/MOF HNC）。本文首次报道了一种具有高表面积（表面积为1282 m2 g-1，孔体积为0.93 cm3 g-1）的分级三模态微-介观-大孔LDH/MOF复合材料，它是通过在LDH纳米片超薄膜表面均匀生长MOF纳米晶体合成的。尝试通过合适的非线性动力学和等温方程对橙色II活性染料和Cr(VI)的单一、同时和连续吸附的吸附数据进行定量论证。在不同的pH值（6.0 - 11.0）、吸附剂用量（1.0 - 8.0 mg）、吸附质浓度（5 - 500 mg L-1）和温度（293 - 323 K）下进行了实验。Langmuir模型显示与LDH/MOF HNC的平衡数据拟合良好（相关系数R2 > 0.98），在同时吸附系统中，橙色II和Cr(VI)的计算最大吸附容量分别为1173和733 mg g-1。研究结果表明，LDH/MOF HNCs有可能作为一种有前景的纳米吸附剂，用于从水中同时去除和提取有毒染料和金属。
