Sorption of Copper, Nickel and Cadmium on Bone Char

• Tipo: Artigo em Revista Científica Internacional
• Data: 2017

Autores

José Inácio Martins (Autor) FEUP; José Melo Orfão (Autor) FEUP; O.S.G.P. Soares (Autor) FEUP

Revista

Título: Protection Of Metals And Physical Chemistry Of Surfaces

Vol. 53

Páginas: 618-627

ISSN: 2070-2051

Editora: Pleiades Publishing

Indexação

ISI Web of Knowledge - 4 Citações

ISI Web of Science

Scopus - 9 Citações

Outras Informações

ID Authenticus: P-00N-3RM

DOI: 10.1134/s2070205117040153

Abstract (EN): The sorption capacity of bone char was tested on the removal of copper, nickel and cadmium ions, from aqueous solutions. The Freundlich and Langmuir models were applied to the adsorption isotherms. The equilibrium data fitted well with the Langmuir model and the maximum loading capacities showed the following affinity order: Cu2+ (1.093 mmol g(-1) at pH(i) 3, and 0.884 mmol g(-1) at pH(i) 4) > Cd2+ (0.760 mmol g(-1) at pH(i) 3, and 0.690 mmol g(-1) at pH(i) 4) > Ni2+ (0.453 mmol g(-1) at pH(i) 3, and 0.225 mmol g(-1) at pH(i) 4). The kinetic data follow a diffusion model in the film and inside particles. A sorption mechanism based on ion exchange, attack by protons of the carbonate and hydroxide positions in the apatite lattice, and also on the adsorption of protons on the basic active sites of carbon, is proposed to explain the heavy metals removal and the pH decreasing in solution.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10