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In the Laboratory
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Teaching Sustainable Development Concepts in the Laboratory: A Solid–Liquid Extraction Experiment
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Juan Carlos Parajó, Herminia Domínguez, Valentín Santos, José Luis Alonso, and Gil Garrote
Department of Chemical Engineering, University of Vigo–Campus Ourense, As Lagoas, 32004 Ourense, Spain
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July 2008
Vol. 85 No. 7
p. 972
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| Abstract |
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One of the principles of sustainable development is to replace chemicals traditionally derived from oil with alternative, renewable materials. For example, phenol and phenol derivatives currently used in the manufacture of wood adhesives can be replaced (at least in part) by biopolymers extracted from biomass. In this work, pine bark (a renewable resource containing easily extractable, reactive phenols) is employed as a substrate for solid-liquid extraction with dilute NaOH solutions. The kinetics of polyphenol extraction is followed spectrophotometrically. In order to convert absorbance data into concentrations, the extracted polyphenols can be measured gravimetrically for selected samples. The experimental data are interpreted by equations involving two or three regression parameters. Additional aspects illustrating the "biomass refinery" concept applied to pine bark are discussed.
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| Supplement |
Student handouts; Instructor notes
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| More Information |
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Citation |
Parajó, Juan Carlos; Domínguez, Herminia; Santos, Valentín; Alonso, José Luis; Garrote, Gil. J. Chem. Educ. 2008, 85, 972.
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Keywords |
Chemical Engineering; Environmental Chemistry; Graduate Education / Research; Green Chemistry; Interdisciplinary / Multidisciplinary; Kinetics; Laboratory Instruction; Natural Products; Testing / Assessment; Upper-Division Undergraduate
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History |
Created:
Last Updated: |
5/27/2008
6/4/2008
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 Caution! | | Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations. |
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