| Removal of metal ions by modified Pinus radiata bark and tannins from water solutions. | |
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MedLine Citation:
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PMID: 14604644 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Pinus radiata bark and tannins, chemically modified with an acidified formaldehyde solution were used for removing metal ions from aqueous solutions and copper mine acidic residual waters. The adsorption ability to different metal ions [V(V), Re(VII), Mo(VI), Ge(IV), As(V), Cd(II), Hg(II), Al(III), Pb(II), Fe(II), Fe(III), Cu(II)] and the factors affecting their removal from solutions were investigated. Effect of pH on the adsorption, desorption, maximum adsorption capacity of the adsorbents, and selectivity experiments with metal ion solutions and waste waters from copper mine were carried out. The adsorbents considerably varied in the adsorption ability to each metal ion. The adsorption depends largely upon the pH of the solution. Modified tannins showed lower adsorption values than the modified bark. For the same adsorbent, the maximum capacity at pH 3 for the different ions were very different, ranging for modified bark from 6.8 meqg(-1) for V to 0.93 meqg(-1) for Hg. Waste waters were extracted with modified bark as adsorbent and at pH 2. The ions Cu(II) (35.2 mgL(-1)), Fe(III) (198 mgL(-1)), Al(III) (83.5 mgL(-1)) and Cd(II) (0.15 mgL(-1)) were removed in 15.6%, 46.9%, 83.7% and 3.3%, respectively, by using 1g of adsorbent/10 mL of waste water. In general, a continuous adsorption on a packed column gave higher adsorbed values than those observed in the batchwise experiment. |
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Authors:
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Graciela Palma; Juanita Freer; Jaime Baeza |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Water research Volume: 37 ISSN: 0043-1354 ISO Abbreviation: Water Res. Publication Date: 2003 Dec |
Date Detail:
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Created Date: 2003-11-07 Completed Date: 2004-03-16 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0105072 Medline TA: Water Res Country: England |
Other Details:
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Languages: eng Pagination: 4974-80 Citation Subset: IM |
Affiliation:
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Departamento de Ciencias Químicas, Universidad de La Frontera, Casilla 54-D, Av. Francisco Salazar, 01145 Temuco, Chile. gpalma@ufro.cl |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adsorption Biodegradation, Environmental Conservation of Natural Resources Metals, Heavy / isolation & purification* Mining Pinus Plant Bark / chemistry Tannins / chemistry* Water Pollutants / isolation & purification* Water Purification / methods* |
| Chemical | |
Reg. No./Substance:
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0/Metals, Heavy; 0/Tannins; 0/Water Pollutants |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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