Preparation of Silica-Supported Biosorbents for Copper(II) Removal

• Published in: Journal of dispersion science and technology Vol. 32; no. 12; pp. 1735 - 1741
• Main Authors: Singhon, Rattiya, Husson, Jérôme, Knorr, Michael, Euvrard, Myriam
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 01.01.2011; Taylor & Francis; Taylor & Francis Ltd
• Subjects: Adsorbents; Adsorption; biopolymer; Chemical Sciences; Chemistry; Chitosan; Colloidal state and disperse state; Cu(II); Dispersions; Exact sciences and technology; General and physical chemistry; Isotherms; Mathematical analysis; silica; Silicon dioxide; Surface chemistry; Surface physical chemistry; Copper II; Water; Removal; Binary compound; Amino group; Support; Hybrid material; Adsorption capacity; Metal ion; Grafting; Silica; Capture; Mechanism; Particle; Biopolymer; Freundlich isotherm; pH; Adsorbent; Equation; Cu(II); Equilibrium; Langmuir isotherm; Heavy metal; Adsorption; Preparation; Models; Chitosan; Kinetics
• ISSN: 0193-2691; 1532-2351
• DOI: 10.1080/01932691.2011.616133

The objective of this study is the preparation of various types of functionalized silica particles for the capture of Cu(II) ions. Amino-functionalized silica and hybrid chitosan/silica particles have been prepared by grafting silica with amino groups and/or adsorption of chitosan on the surface of silica to develop efficient adsorbents for heavy metals ions in water. The adsorption of Cu(II) on these materials was carried out at pH 5 at 298 K. The kinetics were evaluated utilizing pseudo-first-order and pseudo-second-order models. The best interpretation for equilibrium data was given by both Langmuir and Freundlich isotherm models. The adsorption kinetics followed the mechanism of the pseudo-second-order equation for all systems studied. This study demonstrates that the adsorption capacities for Cu(II) ions are more efficient for the bio-hybrid material compared to amino-functionalized silica.