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Effects on the removal of Pb 2+ from aqueous solution by crab shell
Author(s) -
Kim Dong Seog,
Park Byoung Yoon
Publication year - 2001
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.505
Subject(s) - aqueous solution , chemistry , dissolution , chitin , precipitation , nuclear chemistry , adsorption , ion exchange , shell (structure) , metal , metal ions in aqueous solution , chitosan , ion , materials science , biochemistry , physics , organic chemistry , meteorology , composite material
The effects of temperature, pH, chitin and chitosan on Pb 2+ removal by crab shell were investigated. Pb 2+ removal by crab shell was greater than that of chitin and chitosan, indicating that chitin did not contribute to Pb 2+ removal by crab shell. The quantity and rate of Pb 2+ removal increased as the pH value increased. The rate of Pb 2+ removal increased with increased temperature, but the maximum amount of Pb 2+ removal was constant irrespective of temperature. Metal ions (K + , Na + , Mg 2+ , Ca 2+ ) were released from crab shell concomitant with Pb 2+ removal by ion exchange. The amount of Ca 2+ released was greater than any for other metal ions in both Pb 2+ and Pb 2+ ‐free solutions. The amount of Ca 2+ released in Pb 2+ solution was greater than that in Pb 2+ ‐free solution, whereas CO 3 2− release in Pb 2+ solution was less than in Pb 2+ ‐free solution. Pb 2+ removal was mainly a consequence of dissolution of CaCO 3(s) with consequence precipitation of Pb 3 (CO 3 ) 2 (OH) 2(s) and PbCO 3(s) . Pb 2+ accelerated the dissolution of CaCO 3(s) by ion exchange and the precipitation occurred both at the surface and in the inner part of the crab shell. © 2001 Society of Chemical Industry