Konjac glucomannan beads have been investigated as metal biosorbent for Pb(II) from aqueous solutions. The effect of contact time, solution pH, initial metal concentration, and desorption were studied in batch experiments at 20°C±2°C. Maximum mental sorption was found to occur at initial pH 4.0–5.5. Kinetic studies revealed that the initial uptake was rapid and equilibrium was established in 3 h and that the data followed the prseudo-second order reaction. The equilibrium sorption data at initial pH 4.0 were described by the Langmuir and Freundlich isotherm models; however, Langmuir isotherm model has been found to provide the best correlation. The highest value of Langmuir maximum uptake (q max) was found to be 105.71 mg·g−1. Similar Freundlich empirical constant (K F) was obtained to be 1.98 for lead. Adsorption-complexation may be involved in the sorption process of lead. Desorption experiments showed evidence that after two contacts neither HCl nor EDTA solutions were able to desorb lead from the konjac glucomannan beads, but the desorbtion efficacy of HCl solution was higher than EDTA solution. The results obtained show that konjac glucomannan beads may be used for the treatment of wastewater contaminated with lead.
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School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, 621000, China
XiaoYan Long, XueGang Luo, Yang Wang & Zheng Li
China Academy of Engineering Physics, Mianyang, 621000, China
XiaoYan Long
Correspondence to XueGang Luo.
Additional informationSupported by the National Key Technology R&D Program (Grant No. 2007BAE4204) and Sichuan Application Foundation of SiChuan Science and Technology Bureau (Grant No.2007JY0009)
About this article Cite this articleLong, X., Luo, X., Wang, Y. et al. Sorption of Pb(II) from aqueous solution by konjac glucomannan beads. Sci. China Ser. E-Technol. Sci. 52, 223–226 (2009). https://doi.org/10.1007/s11431-009-0029-0
Received: 16 June 2008
Accepted: 25 September 2008
Published: 14 January 2009
Issue Date: January 2009
DOI: https://doi.org/10.1007/s11431-009-0029-0
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