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Sorption of Lead, Cadmium, and Zinc on Sulfur‐Containing Chemically Modified Wastes of Fluted Pumpkin ( Telfairia occidentalis H ook f.)
Author(s) -
Horsfall Michael,
Spiff Ayebaemi I.
Publication year - 2005
Publication title -
chemistry and biodiversity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.427
H-Index - 70
eISSN - 1612-1880
pISSN - 1612-1872
DOI - 10.1002/cbdv.200590017
Subject(s) - chemistry , sorption , aqueous solution , adsorption , langmuir , zinc , cadmium , physisorption , freundlich equation , biomass (ecology) , reaction rate constant , exothermic process , metal , nuclear chemistry , metal ions in aqueous solution , inorganic chemistry , kinetics , organic chemistry , oceanography , physics , quantum mechanics , geology
We have tested the applicability of regular as well as sulfanylacetic acid (SA) modified fluted pumpkin waste biomass as adsorbents for Pb 2+ , Cd 2+ , and Zn 2+ aqueous solutions by means of the batch‐sorption technique. The data revealed that SA modification produces a larger surface area, enhancing the metal‐ion binding capacity of the biomass. The sorption process was examined by means of Freundlich and Langmuir models. The kinetic study showed that the sorption rates can be described by a pseudo‐second‐order process. The rate constants for the control biomass (CB) were 2.2×10 −2 , 4.4×10 −2 , and 1.6×10 −2 mg g −1 min −1 for Pb 2+ , Cd 2+ , and Zn 2+ , respectively; and the corresponding rate constants for the SA‐modified biomass were 4.0×10 −2 , 4.7×10 −2 , and 1.7×10 −2 mg g −1 min −1 , respectively. Thermodynamic considerations indicated a spontaneous exothermic process, which implies that physisorption is the main mechanism in the sorption process.