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Adhesive Stalks of Diatom Didymosphenia geminata as a Novel Biological Adsorbent for Hazardous Metals Removal
Author(s) -
Wysokowski Marcin,
Bartczak Przemysław,
ŻółtowskaAksamitowska Sonia,
Chudzińska Agata,
Piasecki Adam,
Langer Enrico,
Bazhenov Vasilii V.,
Petrenko Iaroslav,
Noga Teresa,
Stelling Allison L.,
Ehrlich Hermann,
Jesionowski Teofil
Publication year - 2017
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201600678
Subject(s) - adsorption , freundlich equation , sorption , langmuir , metal ions in aqueous solution , diatom , metal , chemistry , langmuir adsorption model , environmental chemistry , nuclear chemistry , botany , organic chemistry , biology
The application of biomass derived from the nuisance fresh‐water diatom species Didymosphenia geminata toward the adsorption and removal of heavy‐metal ions from water is reported. The cell‐free polysaccharide‐based stalks of these diatoms are used as adsorbents to remove harmful metal ions: Pb(II), Ni(II), and Cd(II). Detailed analyses of the adsorption kinetics using both pseudo‐first‐order model and pseudo‐second‐order models are performed. The results show a strong correspondence to a pseudo‐second‐order kinetic model. The Langmuir and Freundlich models are used to describe the adsorption isotherms. The correlation coefficients ( r 2 ) of the Langmuir model are equal to 0.994 (Pb 2+ ), 0.995 (Cd 2+ ), and 0.995 (Ni 2+ ), and the r 2 for the Freundlich model are equal to 0.991 (Pb 2+ ), 0.991 (Cd 2+ ), and 0.987 (Ni 2+ ). The experimental data for all metal ions strongly support the Langmuir isotherm model. It is shown that stalks of D. geminata exhibit exceptional sorption capacity ( q m ) for Pb(II) ions of 175.48 mg g −1 . Additionally, a high sorption capacity for Cd(II) (145.86 mg g −1 ), and Ni(II) (130.27 mg g −1 ) is observed. The thermodynamic aspects of the adsorption process of selected metal ions are also discussed. Preliminary tests investigating applications of D. geminata stalks for sewage purification from galvanic industry and battery and accumulator production were performed. These comprehensive studies show that D. geminata can be robustly applied for the removal of harmful metal ions from wastewater.