Mechanism of cadmium ion removal by base treated juniper fiber

Abstract

Pinyon juniper, Juniperus Monosperma, is a small-diameter and underutilized (SDU) lignocellulosic material. Evaluated were efficacy of base-treated juniper fiber (BTJF) sample for cadmium (Cd 2+ ) sorption and the viability of juniper fiber as a sorbent for the removal of Cd 2+ from water. Fourier Transform Infrared Spectroscopy (FTIR) analysis indicated that carboxylate ion is a major functional group responsible for Cd 2+ sorption and the apparent ideal sodium hydroxide (NaOH) concentration for the base treatment was approximately about 0.5 M. From the batch sorption isotherm test, it was found that equilibrium sorption data were better represented by the Langmuir model than by the Freundlich model. After the base treatment, despite a decrease in specific sur ace area from 0.2864 to 0.2450 m2/g, the maximum Cd 2+ sorption loading, Q max, was greatly improved from 9.18 to 29.54 mg/g. A pseudo-second order kinetic model, assuming that the sorption follows the Langmuir equation, fitted well for the sorption of Cd 2+ onto BTJF. Alkalinity of treatment was the major parameters influencing the kinetics of the sorption reaction. The BTJF could be an inexpensive and an efficient sorbent for the removal of heavy metals in storm water runoff due to a rather strong heavy metal (Cd 2+) binding ability and fast kinetics.

Citation

Min, Soo-Hong; Park, J.K.; Han, James S.; Shin, Eun Woo. 2003. Mechanism of cadmium ion removal by base treated juniper fiber. Proceedings of the IAWPS 2003 International Conference on Forest Products : Better Utilization of Wood for Human, Earth and Future : Daejeon, Korea, April 21-24, 2003. Volume 1. [S.l.] : The Korean Society of Wood Science and Technology, International Association of Wood Products Societies, [2003]: Pages 607-614