Removal of anionic metals by amino-organoclay for water treatment

We describe a facile and simple one-pot synthesis of water-soluble amino-organoclay under ambient conditions. The clay was used to successfully remove environmentally toxic anionic metals, such as arsenate, chromate, and ferricyanide. The electrostatic interactions between the anionic metals and the...

Full description

Saved in:
Bibliographic Details
Published in:Journal of hazardous materials 2011-06, Vol.190 (1), p.652-658
Main Authors: Lee, Young-Chul, Park, Won-Kun, Yang, Ji-Won
Format: Article
Language:English
Subjects:
Aluminum Silicates - chemistry
Amines - chemistry
Anionic metals
Anions
Applied sciences
Arsenates
Chemical Precipitation
Chromates
Clay (material)
Exact sciences and technology
Humic acid
Humic acids
Humic Substances
Metals - isolation & purification
Organoclay
Pollution
Precipitation
Solubility
Synthesis
Toxicology
Water Pollutants, Chemical - isolation & purification
Water Purification - methods
Water treatment
Water-soluble
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We describe a facile and simple one-pot synthesis of water-soluble amino-organoclay under ambient conditions. The clay was used to successfully remove environmentally toxic anionic metals, such as arsenate, chromate, and ferricyanide. The electrostatic interactions between the anionic metals and the protonated amino (ammonium) groups of the amino-organoclay resulted in rapid precipitation, within 3 min, with a high removal capacity. The maximum removal capacities (in units of mg metal per g organoclay) of the amino-organoclay clay toward HAsO 4 2−, CrO 4 2−, or Fe(CN) 6 3− were, 30.73 mg/g, 34.67 mg/g, or 218.88 mg/g in case of 0.02 g, 0.03 g, and 0.005 g of the amino-organoclay, respectively. The removal efficiencies of 0.07 g, 0.09 g, and 0.03 g of the amino-organoclay whose dosage of clay was at the highest removal efficiency (%) for arsenate, chromate, and ferricyanide, respectively, presented 59.79%, 89.54%, and 97.43%. Furthermore, humic acid that ubiquitous in the organic matter present in water or soil environments, inhibited the removal rate of anionic metals, and thus the removal efficiencies toward all anionic metals were markedly reduced. Humic acid preferentially precipitated with the interaction of amino-organoclay prior to the anionic metals.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2011.03.093