The biosorption characteristics of Cd (II) ions from synthetic wastewater using raw Ayous wood sawdust (Triplochiton scleroxylon), r-AS, immobilized by sodium alginate were investigated with respect to pH, biomass quantity, contact time, initial concentration of heavy metal, temperature and stirring rate. The experimental data fitted well with the Langmuir isotherm, suggesting that monolayer adsorption of the cadmium ions onto alginate-Ayous sawdust composite (a-ASC). The obtained monolayer adsorption capacity of a-ASC for Cd (II) was 6.21 mg/g. From the Dubinin-Radushkevich isotherm model, a 5.39 kJ/mol value for the mean free energy was calculated, indicating that Cd (II) biosorption could include an important physisorption stage. Thermodynamic calculations showed that the Cd (II) biosorption process was feasible, endothermic and spontaneous in nature under examined conditions. The results indicated that a-ASC could be an alternative material replacing more costly adsorbents used for the removal of heavy metals.
This work investigates the possible usage of edible mushrooms as support for metabolic quantities of copper. Biosorption potential of natural and biodegradable matrix formed from wild Lactarius piperatus mushrooms, in suspension (LP) and alginate immobilized based beads (LPAB), was explored. The effects of biomass quantity, Cu(II) concentration, and temperature were assessed. LPAB showed better adsorption capacity (7.67 mg/g) by comparison to LP biosorbent (6.43 mg/g). Also, biosorption efficiencies up to 76 and 99 % for LP and LPAB (for the same quantity of biomass, 2 g), respectively, were obtained. Furthermore, a multilayer feed forward Artificial Neural Network (ANN) model was developed in order to predict the biosorption efficiency. The trained ANNs, for LP and LAPB biosorbents, showed good correlation (R = 0.998) between the predicted and experimental biosorption efficiency, associated to reduced mean relative errors and demonstrated that the ANN has a good generalization potential. 1–2 g of Lactarius piperatus mushroom, as powder or in alginate‐based beads containing Cu(II), could be used as a dietary supplement in order to supply the daily copper demand of the organism.
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.
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