Open AccessEco-friendly Elderberry based sorbent for removing Pb2+ ions from aqueous solutions
Author(s) -
Jovana Bošnjaković,
Mladen Bugarčić,
Natalija Čutović,
Aleksandar Jovanović,
S. Manasijević,
Аleksandar Marinković,
Zlate Veličković
Publication year - 2022
Publication title -
metallurgical and materials engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.161
H-Index - 2
eISSN - 2812-9105
pISSN - 2217-8961
DOI - 10.30544/710
Subject(s) - adsorption , aqueous solution , fourier transform infrared spectroscopy , endothermic process , langmuir adsorption model , materials science , pith , sorbent , langmuir , nuclear chemistry , chemistry , chemical engineering , organic chemistry , botany , engineering , biology
Elderberry (Sambucus nigra) pith was modified with polyethyleneimine (PEI) in order to improve the adsorption properties. Characterization of both dried Sambucus nigra pith (DSNP) and amino modification of elderberry pith with branched PEI (PEI/DSNP) was performed by: Fourier-transform infrared spectroscopy (FTIR), optical microscopy, and porosity determination. The amine and ester number, as well as acid value, were determined on DSNP and PEI/DSNP samples using standard volumetric methods. The samples were used as adsorbents for Pb2+ ions from an aqueous solution in a batch system. The obtained results were fitted using suitable equilibrium isotherm and kinetic models. The maximum adsorption capacity for Pb2+ ions on DSNP and aminаted sample, obtained using Langmuir adsorption isotherm at 298 K, are 18.9 and 47.8 mg g-1, respectively. Based on the kinetic studies, the adsorption process follows the pseudo second-order model. Thermodynamic parameters showed that the adsorption process is endothermic and spontaneous. In general, the overall adsorption process was improved by modifying starting material with branched PEI modifier by introducing large numbers of amino functionalities having high affinity to cations.