Removal of rhodamine B from water by modified carbon xerogels

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 543; pp. 109 - 117
• Main Authors: Ptaszkowska-Koniarz, Magdalena, Goscianska, Joanna, Pietrzak, Robert
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 20.04.2018
• Subjects: Adsorption of rhodamine B; Carbon xerogels; Copper(II) chloride; Modification with amine groups; Surface oxidation; Modification with amine groups; Copper(II) chloride; Adsorption of rhodamine B; Surface oxidation; Carbon xerogels
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2018.01.057

[Display omitted] •Carbon xerogel was synthesized in the process of polycondensation of resorcinol and formaldehyde.•Carbon xerogels were subjected to surface oxidation, functionalization and impregnation.•Modification of carbon xerogels increases its sorption capacity towards rhodamine B.•Sorption capacity increases with increasing temperature of the process.•Adsorption of the rhodamine B is a spontaneous and endothermic process. Carbon xerogels was synthesized in the process of polycondensation of resorcinol and formaldehyde. The material was subjected to surface oxidation by a solution of ammonium persulfate, functionalization with amine groups and impregnation with copper(II) chloride. The carbon xerogels were characterized by low-temperature nitrogen adsorption, X-ray diffraction, scanning electron microscopy and infrared spectroscopy. The content of oxygen functional groups on the surface of the materials studied was determined by the Boehm method. All carbon xerogels were used for rhodamine B adsorption from liquid phase. The maximum sorption capacities of the samples were in the range 91–132 mg/g. The most effective adsorbent of rhodamine B proved to be the sample modified with amine groups and copper(II) chloride. The increase in temperature was found to increase the sorption capacities of carbon xerogels towards rhodamine B, while the basic environment was conducive to its adsorption on xerogels. The sorption of rhodamine B is a spontaneous endothermic process.