Diffusion kinetic study of cadmium(II) biosorption by Aeromonas caviae

✍ Scribed by Maria X Loukidou; Thodoris D Karapantsios; Anastasios I Zouboulis; Kostas A Matis

• Publisher: Wiley (John Wiley & Sons)
• Year: 2004
• Tongue: English
• Weight: 240 KB
• Volume: 79
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/jctb.1043

✦ Synopsis

Abstract

The removal of cadmium from aqueous solution by sorption on Aeromonas caviae particles was investigated in a well‐stirred batch reactor. Equilibrium and kinetic experiments were performed at various initial bulk concentrations, biomass loads and temperatures. Biosorption equilibrium was established in about 1 h and biosorption was well described by the Langmuir and Freundlich biosorption isotherms. The maximum biosorption capacity was found as 155.32 mg Cd(II) g^−1^ at 20 °C. The obtained sorption capacity is appreciably high for most experimental conditions; so A caviae may be considered as a suitable biosorbent for the removal of cadmium. Moreover, the sorption rate of cadmium onto A caviae particles was particularly sensitive to initial bulk concentration and solid load. A detailed analysis was conducted, examining several diffusion (external and intraparticle) kinetic models in order to identify a suitable rate expression. The results are discussed and indicate that biosorption of cadmium is a complex process that is described more correctly by more than one model. Copyright © 2004 Society of Chemical Industry