Biosorption performance of the lichen biomass (Diploicia canescens) for the removal of nickel from aqueous solutions

被引:3
作者
Hannachi, Y. [1 ]
Boubaker, T. [1 ]
机构
[1] Fac Sci Monastir, Lab Chim Heterocycl, Prod Nat & React CHPNR, Ave Environm, Monastir 5019, Tunisia
关键词
Diploicia canescens; Biosorption; Kinetic; Isotherm; FTIR and EDAX analysis; Thermodynamic; Nickel(II); CR(III) IONS; GREEN-ALGAE; METAL-IONS; EQUILIBRIUM; WASTE; ADSORPTION; SORPTION; CADMIUM; COPPER(II); LEAD(II);
D O I
10.1080/19443994.2015.1094424
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
This study was focused on lichen biomass Diploicia canescens as an alternative biosorbent for the removal of nickel from aqueous solution. Experiments are carried out as a function of solution pH, biosorbent dosage, contact time, and temperature. The equilibrium data were applied to the Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models. The maximum Ni(II) sorption capacity of D. canescens was found to be 66.7mg/g at pH 5, biomass concentration 4g/L, contact time 60min, and temperature 20 degrees C. From the D-R isotherm model, the mean free energy was calculated as 11.2kJ/mol, indicating that the biosorption of Ni(II) ions was taken place by chemical ion exchange. The biosorption kinetics were best described by the pseudo-second-order model. The thermodynamic parameters showed that the biosorption process was feasible, spontaneous, and exothermic. FTIR and EDAX analysis revealed that the whole biosorption process is mainly dominated by ion exchange mechanism, accompanied by a certain amount of surface complexation.
引用
收藏
页码:18490 / 18499
页数:10
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