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Adsorption of Cu(II) from Aqueous Solutions Using Pinus densiflora Wood  

Park, Se-Keun (강원대학교 공과대학 환경공학과)
Kim, Ha-Na (강원대학교 공과대학 환경공학과)
Kim, Yeong-Kwan (강원대학교 공과대학 환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.21, no.1, 2007 , pp. 27-36 More about this Journal
Abstract
Milled Korean pine (Pinus densiflora) wood was used to evaluate its adsorption capacity of Cu(II) ions from aqueous solution by running a series of batch experiments. Prior to the tests, the milled woods were pretreated with 1N NaOH, 1N $NHO_3$, and distilled water, respectively, to examine the effect of pretreatment. Within the tested pH range in this study between 3 and 6, copper adsorption efficiency of NaOH-treated wood(96~99%) was superior than $NHO_3$-treated wood(19~31%) and distilled water-treated wood(18~35%). Adsorption behavior of copper onto both raw and $NHO_3$-treated woods was mainly attributed to interaction with carboxylic acid group. For NaOH-treated wood, carboxylate ion produced by hydrolysis was a major functional group responsible for Cu sorption. NaOH treatment of wood changed the ester and carboxylic acid groups into carboxylate group, whereas $NHO_3$ treatment did not affect the production of functional groups which could bind copper. A pseudo second-order kinetic model fitted well for the sorption of copper ion onto NaOH-treated wood. A batch isotherm test using NaOH-treated wood showed that equilibrium sorption data were better represented by the Langmuir model than the Freundlich model.
Keywords
pine wood; adsorption; copper(II) ion; NaOH; carboxylate;
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