Abstract

In this study, we attempted to intercalate the Keggin polyoxometalate (POM) anion SiW₁₂O₄₀⁴⁻ with NiAl-layered double hydroxide using a facile ion-exchange technique under a N₂ atmosphere. The obtained solids were characterized via X-ray diffraction analysis, Fourier-transform infrared spectroscopy, N₂ adsorption-desorption isotherms, scanning and transmission electron microscopes to evaluate their surface morphology. Furthermore, the synthesized materials were employed as novel adsorbents for the removal of malachite green (MG) dye from aqueous solutions. The intercalation was successful. The synthesized material as an adsorbent for the removal of MG can be used for the removal of cationic dyes from aqueous solutions. The adsorption kinetics study showed that the adsorption of MG onto NiAl-POM best fitted the pseudo-second-order model, which indicated that the adsorption process was conducted chemically. Moreover, the adsorption isotherm revealed that the adsorption occurred in a monolayer system. The regeneration process showed that the high effectivity adsorption process after fifth cycles adsorption for NiAl-POM.

摘要

在这项研究中，我们尝试在 N ₂气氛下使用简便的离子交换技术将 Keggin 多金属氧酸盐 (POM) 阴离子 SiW ₁₂ O ₄₀ ^{4-与 NiAl 层状双氢氧化物嵌入。}所得固体通过 X 射线衍射分析、傅里叶变换红外光谱、N _{2进行表征}吸附-解吸等温线、扫描和透射电子显微镜以评估其表面形态。此外，合成的材料被用作从水溶液中去除孔雀绿（MG）染料的新型吸附剂。插层成功。该合成材料作为去除MG的吸附剂可用于去除水溶液中的阳离子染料。吸附动力学研究表明，MG在NiAl-POM上的吸附最符合准二级模型，这表明吸附过程是化学进行的。此外，吸附等温线表明吸附发生在单层体系中。再生过程表明，NiAl-POM在第五次循环吸附后的吸附效率较高。