Pinus densiflora 목질을 이용한 수용액 중의 Cu(Ⅱ) 흡착

초록

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 HNO3, 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 HNO3-treated wood(19～31%) and distilled water-treated wood(18～35%). Adsorption behavior of copper onto both raw and HNO3-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 HNO3 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.

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