Abstract

In this study, calcined layered double hydroxides (ZnAl-cLDH) with Zn/Al molar ratio of 2:1 was prepared via coprecipitation method at constant pH of 9 and calcination at 500 °C. The resultant calcined (ZnAl-cLDH) were applied for the adsorption from Congo red and Methyl orange dye removal from aqueous phase. The adsorption kinetics fit the pseudo-second order kinetic models well and the Langmuir isotherm model exhibited a maximum adsorption capacity of 584.56 mg.g⁻¹ and 451.21 mg.g⁻¹ for Congo red and Methyl orange respectively. The results of adsorption–desorption cycles revealed that ZnAl-cLDH have an excellent potential to be used as an economical adsorbent of wastewater treatment.

摘要

在这项研究中，通过共沉淀法在9的恒定pH值下，在500°C下煅烧，制备了Zn / Al摩尔比为2：1的煅烧层状双氢氧化物（ZnAl-cLDH）。将所得煅烧的（ZnAl-cLDH）用于从刚果红中吸附和从水相中除去甲基橙染料。吸附动力学很好地拟合了伪二级动力学模型，Langmuir等温模型对刚果红和甲基橙分别显示了584.56 mg.g ^-1和451.21 mg.g ^-1的最大吸附容量。吸附-解吸循环的结果表明，ZnAl-cLDH具有极好的潜力，可以用作废水处理的经济吸附剂。