二维层状双氢氧化物（NiFe LDH）纳米片在蒙脱土上的二维生长及其对阳离子和阴离子染料吸附性能的影响。
2D-2D growth of NiFe LDH nanoflakes on montmorillonite for cationic and anionic dye adsorption performance.
机构信息
State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
College of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400044, China.
出版信息
J Colloid Interface Sci. 2019 Mar 22;540:398-409. doi: 10.1016/j.jcis.2019.01.022. Epub 2019 Jan 14.
NiFe layered double hydroxides nanoflakes decorated montmorillonite (MMT@NiFe LDH) was successfully prepared by a one-pot hydrothermal method. The 2D-2D growth MMT@NiFe LDH was utilized as an effective adsorbent for removal of anionic dye of methyl orange (MO) and cationic dye of methylene blue (MB). The mole ratio of Ni/Fe could quite influence the interlayer spacing, surface area per unit charge and the ultrathin hexagonal laminated morphology of NiFe LDH decorated on the surface of MMT. Various characterization techniques were conducted to identify it, such as XRD, FT-IR, TG-DTA, BET, XPS and SEM. Under the optimal conditions, the Langmuir-fitted maximum adsorption capacities for MO and MB are 108.80 mg g and 99.18 mg g, respectively. Adsorption kinetics for MO and MB are both verified to be fit in with pseudo-second-order model. This work suggests a facile pathway to synthesize desirable bifunctional adsorbent for cationic and anionic dyes, which provides the potential application for the actual wastewater purification.
镍铁层状双氢氧化物纳米片修饰蒙脱石（MMT@NiFe LDH）通过一锅水热法成功制备。二维到二维生长的 MMT@NiFe LDH 被用作有效吸附剂，用于去除阴离子染料甲基橙（MO）和阳离子染料亚甲蓝（MB）。镍/铁的摩尔比会极大地影响插层间距、单位荷电量的表面积和修饰在蒙脱石表面的超薄六方层状形貌的 NiFe LDH。采用各种表征技术对其进行了鉴定，如 XRD、FT-IR、TG-DTA、BET、XPS 和 SEM。在最佳条件下，MO 和 MB 的 Langmuir 拟合最大吸附容量分别为 108.80 mg/g 和 99.18 mg/g。MO 和 MB 的吸附动力学均符合拟二级动力学模型。这项工作为阳离子和阴离子染料的理想双功能吸附剂的合成提供了一种简便的途径，为实际废水净化提供了潜在的应用。
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