Enhanced efficiency of a chemically modified hyperbranched Kraft lignin in the removal of pharmaceuticals from water at low microgram per liter levels

V. Gomez-Ceballos, P. A. Lara-Martín, Z. Zapata-Benabithe, J. A. Velasquez-Jimenez, G. Quintana-Marin

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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 π 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.

    Original languageEnglish
    Article number106244
    JournalJournal of Environmental Chemical Engineering
    Volume9
    Issue number5
    DOIs
    StatePublished - Oct 2021

    Bibliographical note

    Funding Information:
    Gomez-Ceballos thanks to Ministerio de Ciencias Tecnolog?a Innovaci?n (Minciencias), Colombia, 757-2016 for a doctoral scholarship. David Espigares Pozo, Jefe de Servicio de la Planta Depuradora de Puerto Real, C?diz, Espa?a.

    Publisher Copyright:
    © 2021 Elsevier Ltd

    Keywords

    • Amination
    • Bioadsorbent
    • Hyperbranched polymer
    • Kraft lignin
    • Pharmaceutically active compounds

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