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Confined Metastable 2-Line Ferrihydrite for Affordable Point-of-Use Arsenic-Free Drinking Water
Chennu Sudhakar, Radha Gobinda Bhuin, Soujit Sen Gupta, - Anshup, Amrita Chaudhary,
Published in Wiley-VCH Verlag
2017
PMID: 27918114
Volume: 29
   
Issue: 7
Abstract
As(III) and As(V) as well as mixed forms of the same could be effectively scavenged by a composite with fast kinetics allowing the creation of an affordable arsenic-free drinking water solution for point-of-use applications. The granular composites, composed of iron oxyhydroxide-chitosan nanostructures, were synthesized by a green synthetic route, which in general involves the hydrolysis of a metal precursor-chitosan complex using an alkaline medium followed by washing and drying at ambient conditions. Metal ion precursor used for the preparation of the composite was Fe3+. All syntheses were carried out in deionized water, while natural ground water or tap water was used for testing. An iron oxyhydroxide-chitosan nanostructure was synthesized. 25 mg of confined metastable 2-line ferrihydrite (CM2LF) was shaken with 100 mL of natural tap water. Arsenic removal efficiency of CM2LF was measured by spiking the natural tap water with As(III) and As(V) separately. Thereafter, the water was left standing for 1.5 h and subsequently the leftover arsenic concentration in treated water was analyzed using inductively coupled plasma mass spectrometry (ICP-MS) after acidification with 5% HNO3. Experiments with water filtration cartridges are described in the main Text. The unprecedented large capacity in field conditions is attributed to the inherent structure of the composite with confined metastable 2-line ferrihydrite in biopolymer cages, which allows the creation of effective adsorption sites. The arsenic adsorption capacity of the composite is 1.4 to 7.6 times better than the available compositions.
About the journal
JournalData powered by TypesetAdvanced Materials
PublisherData powered by TypesetWiley-VCH Verlag
ISSN09359648
Open AccessNo
Concepts (26)
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    Arsenic
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    Chemicals removal (water treatment)
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    Chitin
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    Chitosan
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    Deionized water
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    Groundwater
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    INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY
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    Iron compounds
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    Mass spectrometry
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    Metal ions
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    Metals
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    Nanostructures
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    Nanotechnology
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    Pollution control
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    Potable water
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    Water
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    WATER FILTRATION
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    ARSENIC ADSORPTION
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    Arsenic concentration
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    DRYING AT AMBIENT CONDITIONS
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    FERRIHYDRITES
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    GRANULAR COMPOSITES
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    INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRIES (ICPMS)
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    IRON OXYHYDROXIDES
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    Water purification
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    Water treatment