Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
J Colloid Interface Sci. 2018 Nov 1;529:255-264. doi: 10.1016/j.jcis.2018.06.022. Epub 2018 Jun 15.
In this work, the bio-nanohybrids of magnesium-aluminum layered double hydroxide intercalated with zwitterionic histidine (His-LDH) was synthesized. The crystal phase, morphology, and nanostructure of the as-prepared His-LDH were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and nitrogen adsorption-desorption methods. The His-LDHs were used to remove anionic dyes, including Congo red (CR), indigo carmine (IC) and sunset yellow FCF (SY) from aqueous solutions. The detailed investigation of the kinetics and the adsorption isotherms of CR, IC and SY from aqueous solutions showed that the dyes adsorb rapidly, in accordance with a pseudo-second-order kinetics and a Freundlich adsorption isotherm model. The remarkably high adsorption capacity of the dyes on the His-LDH (efficiency of CR removal, 99.98%; maximum specific removal q, 1112 mg g; efficiency of IC removal, 98.98%; q, 625 mg g; and efficiency of SY removal, 99.78%; q, 400 mg g) is rationalized on the basis of electrostatic interactions as well as π-π and H-bonding interactions between the His-LDH adsorbent and the acidic dyes. Adsorption experiments indicate that the resulting His-LDH has great potential applications as an environmentally friendly material for the swift removal of acidic dyes from aqueous solutions.
在这项工作中，合成了层状双氢氧化物插层两性离子组氨酸（His-LDH）的生物纳米杂化材料。采用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）和氮气吸附-脱附方法对所制备的 His-LDH 的晶体相、形貌和纳米结构进行了表征。将 His-LDH 用于从水溶液中去除阴离子染料，包括刚果红（CR）、靛蓝胭脂红（IC）和日落黄 FCF（SY）。对 CR、IC 和 SY 从水溶液中的动力学和吸附等温线进行了详细研究，结果表明染料的吸附速度很快，符合准二级动力学和 Freundlich 吸附等温线模型。染料在 His-LDH 上具有很高的吸附容量（CR 的去除效率为 99.98%；最大比去除量 q 为 1112 mg g；IC 的去除效率为 98.98%；q 为 625 mg g；SY 的去除效率为 99.78%；q 为 400 mg g），这是基于静电相互作用以及 His-LDH 吸附剂与酸性染料之间的 π-π 和 H 键相互作用来合理化的。吸附实验表明，所得 His-LDH 作为一种环保材料，具有快速去除水溶液中酸性染料的巨大应用潜力。
