Biosorption of Cadmium Ions by Unmodified, Microwave and Ultrasound Modified Brewery and Pure Strain Yeast Biomass

Abstract

The present study investigates the biosorption of cadmium ions from aqueous solution onto unmodified, ultrasound and microwave treated cells of Saccharomyces cerevisiae. FTIR analysis was conducted to characterize the biosorbent. Equilibrium and kinetic studies of unmodified RBW (residual brewery waste) cell yeast and DSM 1333 (pure strain) were conducted by considering the effect of initial cadmium ions concentration. Results showed that the ultrasound and microwave treatments decrease the heavy metal uptake compared with the unmodified biomass. Langmuir and Freundlich isotherm models on both unmodified yeast cell types were used to analyze the equilibrium data. It was found that the Langmuir isotherm and pseudo-second-order kinetics models describe better the cadmium ions removal process.

Removal of Cadmium from Aqueous Solutions by Saccharomyces cerevisiae–Alginate System

“…Also, despite the fact that encapsulation of yeasts by alginate provided a greater number of carboxyl groups, the increase in granular size of S. cerevisiae cells after encapsulation led to a reduction in Cd 2+ biosorption sites [47]. However, encapsulation of yeast led to a more stable, easy-to-handle, economical, and scalable model than the use of free cells [20,25]. S. cerevisiae binds heavy-metal cations on its outer surface due to the presence of negatively charged phosphomannan, phosphate, and carboxyl groups [9].…”

Descontaminación de arsénico, cadmio y plomo en agua por biosorción con Saccharomyces cerevisiae

“…Varios grupos funcionales de las moléculas de la pared celular interaccionan con los cationes metálicos, mediante interacciones electrostáticas. Entre ellos, carboxilos, hidroxilos, fosfatos y grupos tiol (Nagy, Tonk, Cerasella, Măicăneanu & Majdik, 2013;Park, Yun & Park, 2010). También ocurre un intercambio iónico con grupos amidas, como lo demostraron Çabuk, Akar, Tunali & Gedikli (2007), analizando la interacción S. cerevisiae con Pb 2+ por espectroscopía infrarroja con trasformada de Fourier (FTIR).…”

“…Este estudio permitió conocer el papel fundamental que juegan estos grupos químicos, en la unión del metal a la pared celular. Nagy, Tonk, Cerasella, Măicăneanu & Majdik (2013) analizaron células de S. cerevisiae tratadas con irradiación por microondas y ondas ultrasónicas. Se observó una menor capacidad de remoción del Cd 2+ en comparación con la biomasa control.…”

Cd(II), Zn(II) and Cu(II) bioadsorption on chemically treated waste brewery yeast biomass: The role of functional groups

“…The spectra of the region under 1000 cm -1 showed changes in the degradation of the mannans and β 1-3-glucans, which are widely present on yeast cell wall. 12 The peak shifts on IR spectra indicate the groups involved in the bioadsorption process. After Cd 2+ bioadsorption, on the large band, a shifting to higher wavelengths can be observed from 3170 cm -1 to 3198 cm -1 , and to lower wavelengths from 3408 cm -1 to 3392 cm -1 , corresponding to the hydroxyl, carboxyl and amide groups.…”

“…[12][13][14][15][16] It may be noted that the S. cerevisiae yeast go through some kind of modifications during the fermentation process, which provides a better adsorption capacity than its native one.…”