AI Article Synopsis
- The paper investigates how nonliving Laminaria japonica can absorb heavy metals, specifically cadmium (Cd(2+)) and lead (Pb(2+)), using a batch adsorption system.
- The study examines the acidic sites and carboxylic acid functional group properties of Laminaria japonica and determines key metrics such as acidic site content and dissociation constants through various experimental methods.
- Results indicate that the bidentate model best explains the adsorption process, with specific binding constants for Cd(2+) and Pb(2+), and the overall process follows pseudo-second-order kinetics.
Article Abstract
In this paper, study of the biosorption of Cd(2+) and Pb(2+) by nonliving Laminaria japonica in a batch adsorption system is described. The content of acidic sites and the dissociation constant of carboxylic acid functional groups (metal-binding site) of L. japonica were experimentally determined by conductometric and potentiometric titrations and theoretically predicated by using monodentate and bidentate binding models. The models are based on the monodentate or bidentate binding reactions of bivalent metal ions to acidic sites. The acidic site content and carboxylic acid dissociation constants determined are 1.25 and 0.18 mmol L(-1), respectively. The results showed that the bidentate adsorption model fits well the biosorption of bivalent metal ions onto L. japonica with the bidentate binding constants for Cd(2+) and Pb(2+) being 5.72 × 10(3) and 6.24 × 10(4) L mol(-1), respectively. The adsorption process of L. japonica followed the pseudo-second-order kinetics.
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| http://dx.doi.org/10.2166/wst.2012.042 | DOI Listing |
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