Using magnetically responsive tea waste to remove lead in waters under environmentally relevant conditions

We report the use of a simple yet highly effective magnetite-waste tea composite to remove lead(II) (Pb(2+)) ions from water. Magnetite-waste tea composites were dispersed in four different types of water-deionized (DI), artificial rainwater, artificial groundwater and artificial freshwater-that mim...

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Bibliographic Details
Published in:PloS one 2013-06, Vol.8 (6), p.e66648
Main Authors: Yeo, Siang Yee, Choi, Siwon, Dien, Vivian, Sow-Peh, Yoke Keow, Qi, Genggeng, Hatton, T Alan, Doyle, Patrick S, Thio, Beng Joo Reginald
Format: Article
Language:English
Subjects:
Activated carbon
Adsorption
Capital costs
Chemical engineering
Chemistry
Deionization
Drinking water
Earth Sciences
Engineering
Environmental conditions
Ferrosoferric Oxide - chemistry
Fresh Water - chemistry
Groundwater
Groundwater - chemistry
Heavy metals
Hydrogen-Ion Concentration
Ions
Iron
Leaching
Lead
Lead - chemistry
Lead - isolation & purification
Lead - pharmacokinetics
Magnetite
Microscopy, Electron, Scanning
Nanoparticles
Permanent magnets
Powders - chemistry
Product development
Rain - chemistry
Rain water
Rainwater
Reproducibility of Results
Science
Soil sciences
Studies
Tea
Tea (Beverage)
Tea - chemistry
Tea - ultrastructure
Time Factors
Water analysis
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - isolation & purification
Water Pollutants, Chemical - pharmacokinetics
Water Purification - methods
Water quality
Water sampling
Water treatment
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Summary:We report the use of a simple yet highly effective magnetite-waste tea composite to remove lead(II) (Pb(2+)) ions from water. Magnetite-waste tea composites were dispersed in four different types of water-deionized (DI), artificial rainwater, artificial groundwater and artificial freshwater-that mimic actual environmental conditions. The water samples had varying initial concentrations (0.16-5.55 ppm) of Pb(2+) ions and were mixed with the magnetite-waste tea composite for at least 24 hours to allow adsorption of the Pb(2+) ions to reach equilibrium. The magnetite-waste tea composites were stable in all the water samples for at least 3 months and could be easily removed from the aqueous media via the use of permanent magnets. We detected no significant leaching of iron (Fe) ions into the water from the magnetite-waste tea composites. The percentage of Pb adsorbed onto the magnetite-waste tea composite ranged from ∼70% to 100%; the composites were as effective as activated carbon (AC) in removing the Pb(2+) ions from water, depending on the initial Pb concentration. Our prepared magnetite-waste tea composites show promise as a green, inexpensive and highly effective sorbent for removal of Pb in water under environmentally realistic conditions.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0066648