Equilibrium and kinetic modelling of Pb2+ biosorption by granulated agar extraction algal waste

• Tipo: Artigo em Revista Científica Internacional
• Data: 2005

Autores

Vitor Vilar (Autor) FEUP; Cidália Botelho (Autor) FEUP; Rui Boaventura (Autor) FEUP

Revista

Título: Process Biochemistry

Vol. 40

Páginas: 3276-3284

ISSN: 1359-5113

Editora: Elsevier

Indexação

ISI Web of Knowledge - 38 Citações

ISI Web of Science

Scopus - 40 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia do ambiente

CORDIS: Ciências Tecnológicas > Tecnologia > Tecnologia ambiental

Outras Informações

ID Authenticus: P-000-181

DOI: 10.1016/j.procbio.2005.03.021

Abstract (EN): An algal industrial waste from the agar extraction process was immobilized with an organic polymer (polyacrylonitrile, PAN) and used as a biosorbent for Pb2+ removal from aqueous solutions. The effects of the initial concentration, stirring velocity and particles diameter on Pb2+ biosorption were investigated in a batch system in order to explain the adsorption mechanism. Uptake kinetics follows the second-order Lagergren model and equilibrium is well described by the Langmuir isotherm. Maximum biosorption capacity of the composite material was found to be 20.5 +/- 0.8 mg Pb2+/g. Kinetic constants vary with the initial metal concentration. The adsorptive behaviour of biosorbent particles was modelled using a batch reactor mass transfer kinetic model. The model successfully predicts Ph2+ concentration profiles and provides significant insights on the biosorbent performance. The homogeneous diffusion coefficient (D-h) for particles with diameter between 0.5 < d(p) < 1 mm and for an initial concentration of 94 mg Pb2+/l solution was found to be 3.2 x 10(-8) cm(2) s(-1).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9