ADSORPTION OF ARSENIC TO MAGNETITE NANOPARTICLES: EFFECT OF PARTICLE CONCENTRATION, pH, IONIC STRENGTH, AND TEMPERATURE

被引：140

作者：

Shipley, Heather J. ^{[1
]}

Yean, Sujin ^{[2
]}

Kan, Amy T. ^{[3
]}

Tomson, Mason B. ^{[3
]}

机构：

[1] Univ Texas San Antonio, San Antonio, TX 78249 USA

[2] Chevron Energy Technol Co, Integrated Lab Technol, Oilfield Chem, Houston, TX 77042 USA

[3] Rice Univ, Houston, TX 77005 USA

来源：

ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY | 2009年 / 28卷 / 03期

基金：

美国国家科学基金会;

关键词：

Arsenic; Nanoparticles; Adsorption; ZEROVALENT IRON; AQUEOUS-SOLUTIONS; DRINKING-WATER; REMOVAL; FERRIHYDRITE; GROUNDWATER; SPECIATION; CARBONATE; HEMATITE; BEHAVIOR;

D O I：

10.1897/08-155.1

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Little work has been conducted on the adsorption of arsenic to the mixed iron [Fe(II)/(III)] oxide magnetite and the effect that environmental parameters, such as pH, ionic strength, and temperature, have on adsorption. Magnetite nanoparticles are unique because of their affinity for both arsenate and arsenite and increased adsorption capacity from their bulk counterparts. This article shows the effect of various magnetite nanoparticle concentrations on arsenic adsorption kinetics. The adsorption data show the ability of the magnetite nanoparticles to remove arsenate and arsenite from solution in both synthetic and natural waters, and the data fit a first-order rate equation. Because of the increased surface area of these particles, less than 1 g/L of magnetite nanoparticles was needed. The results suggest that arsenic adsorption to the nanoparticles was not significantly affected by the pH, ionic strength and temperature in the ranges tested, which are typical of most potable water sources.

引用

页码：509 / 515

页数：7

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