RT journal article
T1 Enhanced efficiency of a chemically modified hyperbranched Kraft lignin in the removal of pharmaceuticals from water at low microgram per liter levels
A1 Gomez-Ceballos, Viviana
A1 Lara Martín, Pablo Antonio
A1 Zapata-Benabithe, Z.
A1 Velasquez-Jimenez, J.A.
A1 Quintana-Marin, Germán
A2 Química Física
K1 Amination
K1 Bioadsorbent
K1 Hyperbranched polymer
K1 Kraft lignin
K1 Pharmaceutically active compounds
AB This study describes a way to increase the efficiency of Kraft lignin to remove emerging contaminants such as pharmaceutically active compounds (PhACs) at the level of µg L−1. A hyperbranched polymer was prepared by chemically modifying Kraft lignin introducing nitrogen atoms in its structure using urea-formaldehyde as precursors and thus increasing the amount of active sites of lignin. The so-obtained biosorbent was characterized by infrared spectroscopy, SEM-EDS microscopy, elemental analysis, helium pycnometry and N2 physisorption. The bioadsorbent obtained showed an increase in density of 8.5% and 1.4 times in the content of N compared to lignin. While a decrease in solubility of 56% in water at pH 7. The adsorption of PhACs were carried out using different types of compounds such as antibiotics, anti-inflammatory, psychiatric and stimulant, lipid regulators, and diuretics at initial concentrations ranging from 5 to 150 µg L−1, as found in wastewater. The modification process promoted the formation of functional groups onto the surface which favor the sorption of contaminants. This bioadsorbent showed a higher adsorption coefficient especially for those PhACs that do not have chlorine and fluorine atoms in their structure since they reduce the electron charge of the aromatic ring. By a thermodynamic analysis, it was found that the PhACs sorption on the used biosorbent is endothermic and spontaneous.
PB Elsevier
SN 2213-3437
YR 2021
FD 2021-10-01
LK http://hdl.handle.net/10498/37921
UL http://hdl.handle.net/10498/37921
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-nov-2026