Paper Title:
Iron and Chromium Removal from Binary Solutions of Fe(III)/Cr(III) and Fe(III)/Cr(VI) by Biosorbents Supported on Zeolites
  Abstract

The removal of metallic ions from binary aqueous solutions of Fe(III)/Cr(III) and Fe(III)/Cr(VI) by an Arthrobacter viscosus biofilm supported on NaY zeolite was investigated. Experiments were repeated with suspended biomass for comparison purposes. Batch assays were performed using different concentrations (10, 25 and 40 mg/L), for both metals in solution. Results indicated that Arthrobacter viscosus is able to retain the metallic ions, although not totally. The removal efficiencies were improved when the biofilm was supported on the zeolite, for all the initial concentrations of Cr(III), for the intermediate and higher concentration of Cr(VI) and for all range of initial concentrations of Fe(III), in the presence of Cr(III). The bacteria reduce Cr(VI) to Cr(III) and, only then, this cation may be entrapped in the framework zeolite by ion exchange. Suspended bacteria had higher affinity for Fe(III), than for Cr(VI) or Cr(III), while the conjugated system was selective to Fe(III) when in the presence of Cr(VI). For solutions of Fe(III)/Cr(III), very high removals were achieved by the supported system, ranging from 94 to 100 % for Cr(III) and from 98 to 100 % for Fe(III). The conjugated system also reached the highest removal ratio of Cr(VI), 36 %, for the initial concentration of 40 mg/L. The materials in study were characterized by techniques such as FTIR, SEM and chemical analyses.

  Info
Periodical
Materials Science Forum (Volumes 587-588)
Edited by
António Torres Marques, António Fernando Silva, António Paulo Monteiro Baptista, Carlos Sá, Fernando Jorge Lino Alves, Luís Filipe Malheiros and Manuel Vieira
Pages
463-467
DOI
10.4028/www.scientific.net/MSF.587-588.463
Citation
B. Silva, H. Figueiredo, C. Quintelas, I.C. Neves, T. Tavares, "Iron and Chromium Removal from Binary Solutions of Fe(III)/Cr(III) and Fe(III)/Cr(VI) by Biosorbents Supported on Zeolites", Materials Science Forum, Vols. 587-588, pp. 463-467, 2008
Online since
June 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: K.A. Natarajan
Abstract:The role of Acidithiobacillus group of bacteria in acid generation and heavy metal dissolution was studied with relevance to some Indian...
645
Authors: Jun Guo Li, Ling Hong Wei, Yu Zhu Zhang
Other related topics
Abstract:Gas quenching steel slag (GQSS), which was prepared by gas quenching equipment under inert atmosphere, possessed some advantages for...
3069
Authors: Welington F. Magalhães, Fernando Fulgêncio, Fernando C. de Oliveira, Dario Windmöller, José C. Machado, Hermi F. Brito, Oscar L. Malta, Gilberto F. de Sá
Chapter 8: Non-Metallic Materials
Abstract:Positron annihilation lifetime (PALS) and photoluminescence spectroscopies measurements were performed in Tb(III) and Eu(III)...
245
Authors: Xiang Hua Feng, Xiao Rong Zheng, Shi Min Ding
Chapter 9: Energy Chemical Engineering
Abstract:The photochemical reduction of Cr(VI) in aqueous solutions containing Fe(III)-lactate complex was preliminarily investigated. The effects of...
2317
Authors: Zhi Zhong Ding, Yong Chun Dong
Chapter 7: Physics and Chemistry Materials and Technology
Abstract:Fe (III)-modified polytetrafluoroethylene (PTFE) fiber complex was prepared with poly acrylic acid grafted PTFE fiber and FeCl3 aqueous...
913