| Full text | |
| Author(s): |
Faria, Marcia C. S.
[1]
;
Rosemberg, Renedy S.
[2]
;
Bomfeti, Cleide A.
[2]
;
Monteiro, Douglas S.
[2]
;
Barbosa, Fernando
[1]
;
Oliveira, Luiz C. A.
[3]
;
Rodriguez, Mariandry
[2]
;
Pereira, Marcio C.
[2]
;
Rodrigues, Jairo L.
[2]
Total Authors: 9
|
| Affiliation: | [1] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, Dept Anal Clin Toxicol & Bromatol, BR-14040903 Sao Paulo - Brazil
[2] Univ Fed Vales Jequitinhonha & Mucuri, Inst Ciencia Engn & Tecnol, BR-39803371 Teofilo Otoni, MG - Brazil
[3] Univ Fed Minas Gerais, Dept Quim, ICEx, BR-31270901 Belo Horizonte, MG - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | CHEMICAL ENGINEERING JOURNAL; v. 237, p. 47-54, FEB 1 2014. |
| Web of Science Citations: | 66 |
| Abstract | |
delta-FeOOH nanoparticles were prepared by a fast, simple and cheap synthesis method for use as an adsorbent for As(V) in water. Rietveld refinement on XRD pattern confirmed that delta-FeOOH was successful synthesized. TEM images evidenced that the average particle sizes for delta-FeOOH is 20 nm, which provided a high surface area of 135 m(2) g(-1) and average pore sizes of 18 nm, as verified with BET measurements. Zeta potential revealed that the point of zero charge of delta-FeOOH is 8.4, which favored the As(V) adsorption on the delta-FeOOH surface even at neutral pH. The As(V) adsorption capacity of delta-FeOOH was estimated to be 37.3 mg g(-1), at pH 7. The kinetics data were best fitted with a pseudo-second order, thus suggesting chemical adsorption on the surface and pores of delta-FeOOH nanoparticles. The interaction between As(V) and delta-FeOOH nanoparticles was suggested to be mainly inner sphere complexes. The adsorption isotherm obtained at pH 7 was best fitted to the Langmuir and Redlich-Peterson models and, therefore, a non-ideal monolayer adsorption model for As(V) on delta-FeOOH nanoparticles was proposed. The small particle size, high surface area and adsorption capacity make delta-FeOOH a promising adsorbent for toxic metals in contaminated water. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved. (AU) | |