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Improvement of cadmium ion removal by base treatment of juniper fiberAuthor(s): S.H. Min; J.S. Han; E.W. Shin; J.K. Park
Source: Water research. Vol. 38 (2004): pages 1289-1295.
Publication Series: Miscellaneous Publication
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DescriptionJuniper is a small-diameter underutilized lignocellulosic material. We evaluated the efficacy of base-treated juniper fiber (BTJF) for cadmium (Cd2+) sorption and the viability of juniper fiber as a sorbent for removing Cd2+ from water. Fourier transform infrared spectroscopy analysis indicated that carboxylate ion is a major functional group responsible for Cd2+ sorption. The apparent ideal sodium hydroxide concentration for base treatment is approximately 0.5 M. A batch sorption isotherm test showed that equilibrium sorption data were better represented by the Langmuir model than the Freundlich model. After base treatment, the maximum Cd2+ sorption loading, Qmax; was greatly improved (9.18?29.54 mg/g), despite a decrease in specific surface area. A pseudo-second-order kinetic model fitted well for the sorption of Cd2+ onto BTJF. Initial metal ion concentration and treatment alkalinity were found to be major parameters influencing the kinetics of the sorption reaction. As a result of its strong ability to bind cadmium and its faster kinetics in low concentration, BTJF could be an inexpensive and efficient sorbent for removing heavy metals from stormwater runoff.
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CitationMin, S.H.; Han, J.S.; Shin, E.W.; Park, J.K. 2004. Improvement of cadmium ion removal by base treatment of juniper fiber. Water research. Vol. 38 (2004): pages 1289-1295.
KeywordsCadmium, juniper, saponification, Fourier transform infrared (FTIR) spectroscopy, isotherm, kinetics
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