Cd(II) biosorption using Lessonia kelps

• Published in: Journal of colloid and interface science Vol. 357; no. 2; pp. 487 - 496
• Main Authors: Boschi, Carmen, Maldonado, Holger, Ly, Martha, Guibal, Eric
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 15.05.2011; Elsevier
• Subjects: Adsorption; Biomass; biosorption; Cadmium; Cadmium - chemistry; calcium chloride; Chemistry; Dosage; Dose-Response Relationship, Drug; Engineering Sciences; equations; Exact sciences and technology; Fourier transform infrared spectroscopy; General and physical chemistry; Hydrogen-Ion Concentration; Intraparticle diffusion; Kelp - chemistry; Kinetics; Lessonia; Lessonia kelp; macroalgae; Mathematical analysis; Mathematical models; Microscopy, Electron, Scanning; Models, Molecular; Particle Size; pH effect; Phaeophyceae; Sorbents; Sorption; Sorption isotherm; sorption isotherms; Spectroscopy, Fourier Transform Infrared; Surface physical chemistry; temperature; Uptake kinetics; Uptakes; Cadmium; Intraparticle diffusion; pH effect; Lessonia kelp; Uptake kinetics; Sorption isotherm; Modification; Particle size; Stabilization; Biomass; Modeling; Recovery; pH; Adsorbent; Diffusion; Scanning electron microscopy; Experimental data; Transition metal; Calcium chloride; Resistance; Sorption; Infrared spectrometry; Adsorption; Rate equation; Isotherm; Affinity; Models; Kinetics
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2011.01.108

Modeling of uptake kinetics using the model of resistance to intraparticle diffusion (Crank’s equation). [Display omitted] ► Lessonia kelps are efficient sorbents for copper and nickel. ► Characterization of biosorbent by FT-IR spectroscopy and SEM–EDAX. ► Langmuir equation for modeling sorption isotherm. ► Crank equation for fitting uptake kinetics. ► Greater impact of sorbent dosage and metal concentration against particle size and temperature. Lessonia kelps (L. trabeculata and L. nigrescens) have been successfully used for the recovery of Cd(II) from near neutral solutions. The biomass was pre-treated with calcium chloride for stabilization of alginate-based compounds. SEM–EDAX analysis and FT-IR spectrometry analysis were used for identifying the modifications of the biomass. Sorption isotherms were performed at the optimum pH (i.e., pH 6) and the maximum sorption capacity reached up to 1 and 1.5mmolCdg−1 for L. nigrescens (L.n.) and L. trabeculata (L.t.), respectively. The Langmuir equation fits well experimental data. The temperature (in the range 20-40°C) had a more marked effect on affinity coefficient than on maximum sorption capacity. The influence of particle size, sorbent dosage, metal concentration and temperature was evaluated on uptake kinetics. The kinetic profiles that were modeled using the Crank equation (i.e., the resistance to intraparticle diffusion) were hardly affected by the temperature and the particle size contrary to the sorbent dosage and the metal concentration, which show greater impact. The pseudo-second order rate equation was also tested for the modeling of uptake kinetics.