Dong Xue, Lin Yongcen, Ma Yuqin, Zhao Lang
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 P. R. China
School of Chemistry and Environmental Engineering, Changchun University of Science and Technology Changchun 130012 P. R. China.
RSC Adv. 2019 Sep 3;9(47):27674-27683. doi: 10.1039/c9ra05586j. eCollection 2019 Aug 29.
In this study, we report the synthesis of Ce-doped UiO-67 nanocrystals one-step hydrothermal method and their potential use for waste water treatment to remove organic dyes. The as-prepared samples were characterized by using SEM, TEM, FT-IR, XRD, XPS and TG techniques and the results demonstrate the formation of the framework structure of the Ce-doped UiO-67. The adsorption study of the material shows that the Ce-doped UiO-67 nanoparticles preferentially adsorb the cationic dyes such as rhodamine B and malachite green rather than the anionic dyes such as methyl orange. Adsorption capacities are 754.4, 589.2 and 191.6 mg g for rhodamine B, malachite green and methyl orange respectively. Based on its zeta potential and adsorption isotherm, it is understood that Ce doping increases its electrostatic interactions, and as a consequence, improves the adsorption capacity for cationic dyes. In addition, it is found that a pseudo-second-order kinetics and the Langmuir isothermal model were suitable for describing the adsorption behavior of cationic dyes onto the Ce-doped UiO-67.
在本研究中，我们报道了通过一步水热法合成铈掺杂的UiO - 67纳米晶体及其在废水处理中去除有机染料的潜在应用。使用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT - IR）、X射线衍射（XRD）、X射线光电子能谱（XPS）和热重分析（TG）技术对所制备的样品进行了表征，结果表明形成了铈掺杂的UiO - 67的骨架结构。该材料的吸附研究表明，铈掺杂的UiO - 67纳米颗粒优先吸附阳离子染料，如罗丹明B和孔雀石绿，而不是阴离子染料，如甲基橙。罗丹明B、孔雀石绿和甲基橙的吸附容量分别为754.4、589.2和191.6 mg/g。基于其zeta电位和吸附等温线，可以理解铈掺杂增加了其静电相互作用，因此提高了对阳离子染料的吸附容量。此外，发现准二级动力学和朗缪尔等温模型适用于描述阳离子染料在铈掺杂的UiO - 67上的吸附行为。
