Removal of fluoride from aqueous solution by polypyrrole/Fe3O4 magnetic nanocomposite

被引：219

作者：

Bhaumik, Madhumita ^{[1
]}

Leswifi, Taile Yvonne ^{[1
]}

Maity, Arjun ^{[2
]}

Srinivasu, V. V. ^{[2
]}

Onyango, Maurice S. ^{[1
]}

机构：

[1] Tshwane Univ Technol, Dept Chem & Met Engn, ZA-0001 Pretoria, Gauteng, South Africa

[2] CSIR, ZA-0001 Pretoria, South Africa

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2011年 / 186卷 / 01期

关键词：

Polypyrrole; Magnetic nanocomposite; Adsorption; Fluoride; Kinetics; Equilibrium; ELECTRICAL-PROPERTIES; ADSORPTION; WATER; DEFLUORIDATION; NANOPARTICLES; EQUILIBRIUM; COMPOSITES; OXIDE; IONS;

D O I：

10.1016/j.jhazmat.2010.10.098

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Polypyrrole (PPy)/Fe3O4 magnetic nanocomposite as a novel adsorbent was prepared via in-situ polymerization of pyrrole (Py) monomer using FeCl3 oxidant in aqueous medium in which Fe3O4 nanoparticles were suspended. The adsorbent was characterized by Attenuated Total Reflectance Fourier transform infrared spectroscope (ATR-FTIR), Brunauer-Emmet-Teller (BET) method, field emission scanning electron microscope (FE-SEM), high resolution transmission electron microscope (HR-TEM). X-ray photoelectron spectroscope (XPS) and X-ray diffraction (XRD). Magnetic property of the adsorbent was measured by electron spin resonance (ESR). Subsequently, the ability of the adsorbent to remove fluoride ions from aqueous solution was demonstrated in a batch sorption mode. Results reveal that the adsorption is rapid and that the adsorbent has high affinity for fluoride, which depends on temperature, solution pH and adsorbent dose. From equilibrium modelling, the equilibrium data is well described by Freundlich and Langmuir-Freundlich isotherms while the adsorption kinetics is described by the pseudo-second-order model. Thermodynamic parameters confirm the spontaneity and endothermic nature of the fluoride adsorption. Meanwhile, the fluoride adsorption proceeds by an ion exchange mechanism. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：150 / 159

页数：10

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