Chitosan and Chitosan Modified with Glutaraldehyde Microparticles for Pb(II) Biosorption II. Equilibrium and kinetic studies

This paper presents a comparative study regarding the use of chitosan and cross-linked with glutaraldehyde (CIA) chitosan microparticles in the retention of Pb(II) ions from aqueous solutions with low Pb(II) levels. Initial Pb(II) ion concentration, contact time, and pH are parameters considered. Sorption capacity value reaches 43.78 mg Pb(II).g(-1) for chitosan particles, and 41.68 mg Pb(11).g(-1) for chitosan-GLA particles, respectively. Equilibrium sorption data for Pb(II) removal onto chitosan, and chitosan-GIA were consistent with the Langmuir isotherm. Kinetic parameters for the pseudo-rust and pseudo-second orders and intraparticle diffusion equations were determined. Pb(II) sorption on chitosan microparticles can be expressed as a pseudo-second order kinetic which characterizes a chemical process. A different kinetic behaviour function of Pb(II) concentration was observed for chitosan-GLA microparticles. Results show that microparticles obtained can be successfully used for remediation of wastewater with low lead content.