Cadmium(II) and zinc(II) adsorption by the aquatic moss Fontinalis antipyretica: effect of temperature, pH and water hardness

• Type: Article in International Scientific Journal
• Date: 2004

Authors

Ramiro Martins (Author) FEUP; Rosana Pardo Moro (Author) FEUP; Rui A. R. Boaventura (Author) FEUP

Journal

Title: Water Research

Vol. 38 No. 3

Pages: 693-699

ISSN: 0043-1354

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 138 Citations

Scopus - 159 Citations

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

Other information

Authenticus ID: P-000-BX7

DOI: 10.1016/j.watres.2003.10.013

Abstract (EN): The biosorption of cadmium(II) and zinc(II) ions onto dried Fontinalis antipyretica, a widely spread aquatic moss, was studied under different values of temperature, initial pH and water hardness. The equilibrium was well described by Langmuir adsorption isotherms. Maximum biosorption capacity of cadmium was independent on temperature and averaged 28.0 mg g(-1) moss, whereas for zinc, capacity increased with temperature, from 11.5 mg g(-1) moss at 5degreesC to 14.7 mg g(-1) moss at 30degreesC. Optimum adsorption pH value was determined as 5.0 for both metal ions. Cadmium uptake was unaffected by the presence of calcium ions, but zinc sorption was improved when water hardness increased from 101.1 to 116.3 mg CaCO3 l(-1). Inversely, as hardness increases, the competition with calcium ions strongly reduces the affinity of the biosorbent for zinc.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7