New Composites LnBDC@AC and CB[6]@AC: From Design toward Selective Adsorption of Methylene Blue or Methyl Orange

• Published in: PloS one Vol. 12; no. 1; p. e0170026
• Main Authors: Santos, Guilherme de C, Barros, Amanda L, de Oliveira, Carlos A F, da Luz, Leonis L, da Silva, Fausthon F, Demets, Grégoire J-F, Alves Júnior, Severino
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 20-01-2017; Public Library of Science (PLoS)
• Subjects: Absorptivity; Activated carbon; Adsorbents; Adsorption; Analysis; Azo compounds; Azo Compounds - chemistry; Charcoal; Dyes; Earth Sciences; Europium; Gadolinium; Hydrogen ions; Infrared radiation; Ligands; Materials selection; Methylene blue; Methylene Blue - chemistry; Microscopy, Electron, Scanning; pH effects; Photovoltaic cells; Physical Sciences; Polymers; Pore size; Porosity; Powder Diffraction; Properties; Research and Analysis Methods; Selective adsorption; Selectivity; Spectroscopy, Fourier Transform Infrared; Spectrum analysis; Stainless steel; Surface Properties; United States
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0170026

New porous composites LnBDC@AC (AC = Activated carbon, Ln = Eu and Gd and BDC = 1,4-benzenedicaboxylate) and CB[6]@AC (CB[6] = Cucurbit[6]uril) were obtained using hydrothermal route. The LnBDC and CB[B] are located inside the pore of the carbon materials as was observed in SEM-EDS, XRPD and FT-IR analysis. Porosimetry analysis showed values typically between AC and LnBDC material, with pore size and surface area, respectively, 29,56 Å and 353.98 m2g-1 for LnBDC@AC and 35,53 Å and 353.98 m2g-1 for CB[6]@AC. Both materials showed good absorptive capacity of metil orange (MO) and methylene blue (MB) with selectivity as a function of pH. For acid pH, both materials present selectivity by MB and alkaline pH for MO, with notable performance for CB[6]@AC. Additionally, europium luminescence was used as structural probe to investigate the coordination environment of Eu3+ ions in the EuBDC@AC composite after adsorption experiment.