Biosorption of Silver Ions by Paecilomyces Lilacinus Biomass: Equilibrium, Kinetics and Thermodynamics

Abstract

ABSTRACT:The freeze-dried biomass of Paecilomyces lilacinus was employed as a biosorbent for the removal of silver ions from aqueous solution. The effects of factors such as the solution pH, the initial Ag(I) ion concentration, contact time and temperature were examined. Maximum Ag(I) adsorption was obtained at pH 3.0. The pseudo-first-order, pseudo-second-order and intra-particle diffusion kinetic models were fitted to the experimental data when it was found that such data were best fitted by the pseudo-second-order kinetic model. The equilibrium experimental data were well fitted by the Langmuir model (R 2 > 0.995) and the maximum biosorption capacity at 298 K was 101.0 mmol/g. Thermodynamic parameters such as the Gibbs' free energy, ∆G 0 , the standard enthalpy, ∆H 0 , and the standard entropy, ∆S 0 , were evaluated. The results indicated that the biosorption of Ag(I) ions onto P. lilacinus biomass was spontaneous and endothermic in nature. The FT-IR analysis results indicated that amine, carboxylic and hydroxyl groups were involved in the biosorption process.

Screening and performance optimization of fungi for heavy metal adsorption in electrolytes

“… Yildirim et al (2020) utilized Pleurotus ostreatus powder for Ni (II) adsorption and observed a redshift in the absorption peak of -OH (-NH) from 3275 to 3369 cm –1 , consistent with our findings. Ou employed Paecilomyces lilacinus for Ag (I) adsorption and detected redshifts in the -OH peak from 3297 to 3304 cm –1 , blueshifts in the -CH peak from 2928 to 2926 cm –1 and in the -C = O peak from 1653 to 1652 cm –1 ( Ou et al, 2011 ). These alterations in functional groups align with our study’s findings.…”

Kinetics and equilibrium of lanthanum biosorption by free and immobilized microalgal cells

“…The ability to capture heavy metals by various microorganisms and biopolymers has been reported, whereas bacteria, yeasts, fungi, algae and industrial and agricultural wastes appear as good candidates for removal of these metals. Thus, biosorption process has also been exploited for the selective recovery of more valuable metals (Amirnia et al., 2012; Das and Das, 2014; Ou et al., 2011). The process proceeds through interactions between the metal species and the active sites (carboxyl, amino, sulfate) present on the outer surface of the cell wall of biomass.…”