The removal of arsenate from water using iron-modified diatomite (D-Fe): isotherm and column experiments

Iron hydroxide supported onto porous diatomite (D-Fe) is a low-cost material with potential to remove arsenic from contaminated water due to its affinity for the arsenate ion. This affinity was tested under varying conditions of pH, contact time, iron content in D-Fe and the presence of competitive...

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Published in:Environmental science and pollution research international 2014, Vol.21 (1), p.495-506
Main Authors: Pantoja, M. L., Jones, H., Garelick, H., Mohamedbakr, H. G., Burkitbayev, M.
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Affinity
Aquatic Pollution
Arsenates
Arsenates - analysis
Arsenates - chemistry
Arsenic
Arsenic content
Arsenic removal
Atmospheric Protection/Air Quality Control/Air Pollution
Bioremediation
Competition
Diatomaceous earth
Diatomaceous Earth - chemistry
Drinking water
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Experiments
Hydroxides - chemistry
Ions
Iron
Iron - chemistry
Isotherms
Laboratories
pH effects
Phosphates
Phosphates - chemistry
Research Article
Studies
Toxicity
Waste Disposal, Fluid - methods
Waste Water Technology
Water Management
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - chemistry
Water pollution
Water Pollution Control
Water Purification - methods
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creator Pantoja, M. L.
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Burkitbayev, M.
description Iron hydroxide supported onto porous diatomite (D-Fe) is a low-cost material with potential to remove arsenic from contaminated water due to its affinity for the arsenate ion. This affinity was tested under varying conditions of pH, contact time, iron content in D-Fe and the presence of competitive ions, silicate and phosphate. Batch and column experiments were conducted to derive adsorption isotherms and breakthrough behaviours (50 μg L −1 ) for an initial concentration of 1,000 μg L −1 . Maximum capacity at pH 4 and 17 % iron was 18.12–40.82 mg of arsenic/g of D-Fe and at pH 4 and 10 % iron was 18.48–29.07 mg of arsenic/g of D-Fe. Adsorption decreased in the presence of phosphate and silicate ions. The difference in column adsorption behaviour between 10 % and 17 % iron was very pronounced, outweighing the impact of all other measured parameters. There was insufficient evidence of a correlation between iron content and arsenic content in isotherm experiments, suggesting that ion exchange is a negligible process occurring in arsenate adsorption using D-Fe nor is there co-precipitation of arsenate by rising iron content of the solute above saturation.
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Batch and column experiments were conducted to derive adsorption isotherms and breakthrough behaviours (50 μg L −1 ) for an initial concentration of 1,000 μg L −1 . Maximum capacity at pH 4 and 17 % iron was 18.12–40.82 mg of arsenic/g of D-Fe and at pH 4 and 10 % iron was 18.48–29.07 mg of arsenic/g of D-Fe. Adsorption decreased in the presence of phosphate and silicate ions. The difference in column adsorption behaviour between 10 % and 17 % iron was very pronounced, outweighing the impact of all other measured parameters. 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subjects Adsorbents
Adsorption
Affinity
Aquatic Pollution
Arsenates
Arsenates - analysis
Arsenates - chemistry
Arsenic
Arsenic content
Arsenic removal
Atmospheric Protection/Air Quality Control/Air Pollution
Bioremediation
Competition
Diatomaceous earth
Diatomaceous Earth - chemistry
Drinking water
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Experiments
Hydroxides - chemistry
Ions
Iron
Iron - chemistry
Isotherms
Laboratories
pH effects
Phosphates
Phosphates - chemistry
Research Article
Studies
Toxicity
Waste Disposal, Fluid - methods
Waste Water Technology
Water Management
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - chemistry
Water pollution
Water Pollution Control
Water Purification - methods
title The removal of arsenate from water using iron-modified diatomite (D-Fe): isotherm and column experiments
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