Arsenic removal from contaminated water by ultrafine δ-FeOOH adsorbents

被引：133

作者：

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
]}

机构：

[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

来源：

CHEMICAL ENGINEERING JOURNAL | 2014年 / 237卷

基金：

巴西圣保罗研究基金会;

关键词：

Adsorption; Iron oxides; Environmental remediation; Nanoparticles; AQUEOUS-SOLUTIONS; ADSORPTION PERFORMANCE; AS(V); SORPTION; GROUNDWATER; OXIDATION; KINETICS; AS(III); IRON; NANOCOMPOSITES;

D O I：

10.1016/j.cej.2013.10.006

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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.

引用

页码：47 / 54

页数：8

共 40 条

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