Ce-doped UiO-67 nanocrystals with improved adsorption property for removal of organic dyes. Issue 47 (3rd September 2019)

• Record Type: Journal Article
• Authors: Dong, Xue; Lin, Yongcen; Ma, Yuqin; Zhao, Lang
• Is Part Of: RSC advances. Volume 9:Issue 47(2019)
• Page Start: 27674
• Page End: 27683
• Publication Date: 2019-09-03
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra05586j
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The Ce-doped UiO-67 nanocrystals were successfully synthesized via a one-step hydrothermal method. Ce doping increases the negative charge on the surface of the material, thus the adsorbent exhibits high adsorption capacity to cationic dyes. Abstract : In this study, we report the synthesis of Ce-doped UiO-67 nanocrystals via 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 −1 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.