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A Journal on Biotechnology and Molecular Biology
Indexed/Abstracted in: EMBASE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 0,246
Minerva Biotecnologica 2016 June;28(2):75-80
Non-cross-linked membrane and beads of chitosan for efficient heavy metal removal
Masih KARIMI ALAVIJEH 1, Fardin MOUMIVAND 1, Akram ZAMANI 1, 2, Keikhosro KARIMI 1, 2
1 Department of Chemical Engineering, Isfahan University of Technology, Isfahan, Iran; 2 Industrial Biotechnology Group Institute for Biotechnology and Bioengineering, Isfahan University of Technology, Isfahan, Iran
BACKGROUND: The objective of this study was preparation of non-crosslinked beads and membrane of chitosan and their application for removal of heavy metals from aqueous solutions.
METHODS: An acetic acid processing was employed for preparation of the membrane and beads of chitosan. Then they were used for removal of Fe3+, Pb2+, and Cd2+ with low concentration of 15, 12, and 16 ppm, respectively. The chitosan beads were also subjected to a process of 12 subsequent biosorption cycles which were performed for 20 min in fresh heavy metal solutions.
RESULTS AND CONCLUSIONS: The results showed that Fe3+ and Pb2+ were rapidly removed from the solution, and their removal capacities were higher than that of Cd2+ by both type of the prepared chitosan forms. Using the membrane and beads about 99% of Fe3+ and Pb2+ and 20% of Cd2+ were eliminated from the metal solution after 20 min. Pseudo-second order model described the kinetics of Pb2+ and Fe3+ adsorptions very well. In contrast, intraparticle diffusion model predicted the kinetics of Cd2+ removal with a high accuracy. The beads exhibited 93±0, 55±3, and 37±4 % of their Pb2+ and Fe3+ removal efficiencies after 4th, 6th, and 9th cycles, respectively. However, the beads could not adsorb Pb2+ and Fe3+ in 10-12th cycles, instead they released a part of the adsorbed metals during these cycles.