Research Article
Abstract
Fungi, like other microorganisms have the ability to remove heavy metals from solution as many studies have shown. This study focused on the biosorption capacity of immobilized Aspergillus fumigatus biomass for Cu(II) and Ni(II) ions in solution. The dependence of the biosorption efficiency on various parameters such as biosorbent weight, solution pH, contact time and initial metal ion concentration was investigated. The maximum Cu(II) removal efficiency of 98.08 % was recorded at pH 5.0 and contact time of 2 hours. For Ni(II) ions the maximum efficiency of 98.53 % was recorded at pH 5.0 and contact time of 2 hours also. The data from the batch experiments had a good fit to both Langmuir and Freundlich isotherms. The R2 values for the Langmuir isotherm for Cu(II) and Ni(II) ions were 0.9879 and 0.9900 respectively. The maximum biosorption capacity, Qo, for Cu(II) was 3.86 mg/g and for Ni(II), it was 10.59 mg/g. The R2 values as obtained from the plots were 0.9376 for Cu(II) and 0.9074 for Ni(II). The kinetic data had a better fit for the pseudo – second order kinetic model than the pseudo - first order model indicating that chemisorption is the possible mechanism for the biosorption process. It can therefore be inferred from these results that the biomass of Aspergillus fumigatus immobilized in calcium alginate is a low – cost, readily available biosorbent for the removal of copper and nickel ions from wastewaters.
Keywords
Biosorption, Aspergillus fumigatus, Langmuir isotherm, Freundlich isotherm.
References | |
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This work is licensed under the
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Abstract
Fungi, like other microorganisms have the ability to remove heavy metals from solution as many studies have shown. This study focused on the biosorption capacity of immobilized Aspergillus fumigatus biomass for Cu(II) and Ni(II) ions in solution. The dependence of the biosorption efficiency on various parameters such as biosorbent weight, solution pH, contact time and initial metal ion concentration was investigated. The maximum Cu(II) removal efficiency of 98.08 % was recorded at pH 5.0 and contact time of 2 hours. For Ni(II) ions the maximum efficiency of 98.53 % was recorded at pH 5.0 and contact time of 2 hours also. The data from the batch experiments had a good fit to both Langmuir and Freundlich isotherms. The R2 values for the Langmuir isotherm for Cu(II) and Ni(II) ions were 0.9879 and 0.9900 respectively. The maximum biosorption capacity, Qo, for Cu(II) was 3.86 mg/g and for Ni(II), it was 10.59 mg/g. The R2 values as obtained from the plots were 0.9376 for Cu(II) and 0.9074 for Ni(II). The kinetic data had a better fit for the pseudo – second order kinetic model than the pseudo - first order model indicating that chemisorption is the possible mechanism for the biosorption process. It can therefore be inferred from these results that the biomass of Aspergillus fumigatus immobilized in calcium alginate is a low – cost, readily available biosorbent for the removal of copper and nickel ions from wastewaters.
Abstract Keywords
Biosorption, Aspergillus fumigatus, Langmuir isotherm, Freundlich isotherm.
This work is licensed under the
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4.0
License (CC BY-NC 4.0).
Editor-in-Chief
This work is licensed under the
Creative Commons Attribution 4.0
License.(CC BY-NC 4.0).