BIOSORPTION OF HEXAVALENT CHROMIUM BASED ON MODIFIED Y ZEOLITES OBTAINED BY ALKALI-TREATMENT

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Figueiredo, H (Author) Other; Silva, B (Author) Other; Quintelas, C (Author) Other; Manuel Fernando R Pereira (Author) FEUP; Neves, IC (Author) Other; Tavares, T (Author) Other

Journal

Title: Environmental Engineering and Management Journal

Vol. 9

Pages: 305-311

ISSN: 1582-9596

Publisher: Institutul Politehnic din Iasi

Indexing

ISI Web of Knowledge - 14 Citations

ISI Web of Science

Scopus - 17 Citations

Scientific classification

FOS: Engineering and technology > Environmental engineering

Other information

Authenticus ID: P-003-8K0

Abstract (EN): The structural modification of external surface of NaY was investigated in order to enhance efficient biosorption systems consisting of a bacterial biofilm, Arthrobacter viscosus, supported on that zeolite, for removing hexavalent chromium from aqueous solutions. The supported bacterial biofilm reduces Cr(VI) to Cr(III) and this cation is then retained in the zeolite by ion exchange. NaY zeolite was modified by alkali-treatments using NaOH 2.0 M, with two different contact periods of time between the zeolite and the alkaline solutions, resulting in NaY(A) and in NaY(B). The biosorbents supported on the modified NaY zeolite were tested in solutions with low concentration of chromium. The results showed that the modification of external surface of NaY zeolite allows an efficient Cr removal, and the maximum removal efficiency was observed for NaY(A) sample that was submitted to a smoother chemical treatment.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7