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Title: Effect of 2-mercaptoethanoic acid treatment of fluted pumpkin waste (Telfairia occidentalis Hook. f.) on the sorption of Ni2+ ions from aqueous solution
Authors: Jnr, M Horsfall
Spiff, A I
Keywords: Fluted pumpkin
Waste management
Heavy metals
Issue Date: Aug-2005
Publisher: CSIR
IPC CodeC02F 9/00
Abstract: Differential sorption behaviour of pure and acid treated pumpkin waste biomass on the sorption of Ni2+ ion from aqueous solution was assessed by an ensemble of sorption techniques. Biomass was chemically treated by 0.50 N and 1.00 N 2-mercaptoethanoic acid solutions. Sorption capacity calculations from Langmuir isotherm model reveals the following amounts of Ni2+ ions bound per gram of biomass: pure, 12.69; 0.5 N acid treated, 40.0; and 1.0 N acid treated, 42.19 mg/g. The sorption probabilities for Ni2+ onto pure and differentially acid treated biomass were 0.19, 0.22 and 0.31 respectively. Acid treatment significantly enhanced the adsorption potential, adsorption density and sorption probability of biomass towards the metal ion. The negative values of Ea suggest that sorption process is exothermic. This study demonstrates that fluted pumpkin waste could be utilized as low cost, environment friendly biosorbent for the removal of Ni2+ and other trace metals from aqueous solution.
Page(s): 613-620
ISSN: 0975-1084 (Online); 0022-4456 (Print)
Source:JSIR Vol.64(08) [August 2005]

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