Environmental remediation of heavy metal ions from aqueous solution through hydrogel adsorption: a critical review

Heavy metal ions such as Cd(2+), Pb(2+), Cu(2+), Mg(2+), and Hg(2+) from industrial waste water constitute a major cause of pollution for ground water sources. These ions are toxic to man and aquatic life as well, and should be removed from wastewater before disposal. Various treatment technologies...

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Bibliographic Details
Published in:Water science and technology 2016-03, Vol.73 (5), p.983-992
Main Authors: Muya, Francis Ntumba, Sunday, Christopher Edoze, Baker, Priscilla, Iwuoha, Emmanuel
Format: Article
Language:English
Subjects:
Activated carbon
Adsorbents
Adsorption
Aquatic organisms
Biochemistry
Chemical engineering
Chemical precipitation
Coagulation
Copper
Diabetes
Environmental cleanup
Environmental impact
Environmental Restoration and Remediation
Equilibrium
Groundwater
Heavy metals
Hydrogels
Industrial wastes
Industrial wastewater
Lead
Magnesium
Membrane separation
Mercury (metal)
Metal concentrations
Metal ions
Metals
Metals, Heavy - chemistry
Oxidation
PCB
Pollution sources
Polychlorinated biphenyls
Polyvinyl alcohol
Remediation
Removal
Sludge
Waste disposal
Waste materials
Waste Water
Wastewater
Wastewater disposal
Wastewater treatment
Water Pollutants, Chemical - chemistry
Water pollution
Zeolites
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Summary:Heavy metal ions such as Cd(2+), Pb(2+), Cu(2+), Mg(2+), and Hg(2+) from industrial waste water constitute a major cause of pollution for ground water sources. These ions are toxic to man and aquatic life as well, and should be removed from wastewater before disposal. Various treatment technologies have been reported to remediate the potential toxic elements from aqueous media, such as adsorption, precipitation and coagulation. Most of these technologies are associated with some shortcomings, and challenges in terms of applicability, effectiveness and cost. However, adsorption techniques have the capability of effectively removing heavy metals at very low concentration (1-100 mg/L). Various adsorbents have been reported in the literature for this purpose, including, to a lesser extent, the use of hydrogel adsorbents for heavy metal removal in aqueous phase. Here, we provide an in-depth perspective on the design, application and efficiency of hydrogel systems as adsorbents.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2015.567