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Langmuir and Freundlich Isotherms for Describing Lead (II) Adsorption on Pretreated Macrofungus (Agaricus bisporus)


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1 School of Biotechnology, Chemical and Biomedical Engineering, VIT University, Vellore-632 014, Tamil Nadu, India
 

Studies have shown that fungal organisms possess the capacity of heavy metal removal. In the present investigation, a study in batch system was conducted using the macrofungus, Agaricus bisporus as biosorbent for evaluating its potentiality to adsorb lead (II) ions from aqueous solution. To improve the bioadsorption capacity, the biosorbent was pretreated with NaOH, Na2CO3 and NaHCO3. Pretreatment with NaOH resulted in a significant improvement in bioadsorption capacity. The experimental equilibrium data were adjusted by adsorption isotherms from Langmuir and Freundlich models and their equilibrium parameters were determined. For the untreated biosobent, the Langmuir model supplied qmax = 28.8 mg/g and b = 0.02 L/mg and for the Freundlich model parameters are Kf= 1.7 and n =1.8. For the sodium hydroxide (NaOH) treated biomass, the parameters were qmax = 34.6 mg/g, b= 0.08 L/mg, Kf = 5.3 and n = 2.3. The best adjusted model to the experimental equilibrium data for both untreated and sodium hydroxide (NaOH) treated biosorbent was the Langmuir model.
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  • Langmuir and Freundlich Isotherms for Describing Lead (II) Adsorption on Pretreated Macrofungus (Agaricus bisporus)

Abstract Views: 139  |  PDF Views: 3

Authors

D. Charumathi
School of Biotechnology, Chemical and Biomedical Engineering, VIT University, Vellore-632 014, Tamil Nadu, India
R. Vimala
School of Biotechnology, Chemical and Biomedical Engineering, VIT University, Vellore-632 014, Tamil Nadu, India
Nilanjana Das
School of Biotechnology, Chemical and Biomedical Engineering, VIT University, Vellore-632 014, Tamil Nadu, India

Abstract


Studies have shown that fungal organisms possess the capacity of heavy metal removal. In the present investigation, a study in batch system was conducted using the macrofungus, Agaricus bisporus as biosorbent for evaluating its potentiality to adsorb lead (II) ions from aqueous solution. To improve the bioadsorption capacity, the biosorbent was pretreated with NaOH, Na2CO3 and NaHCO3. Pretreatment with NaOH resulted in a significant improvement in bioadsorption capacity. The experimental equilibrium data were adjusted by adsorption isotherms from Langmuir and Freundlich models and their equilibrium parameters were determined. For the untreated biosobent, the Langmuir model supplied qmax = 28.8 mg/g and b = 0.02 L/mg and for the Freundlich model parameters are Kf= 1.7 and n =1.8. For the sodium hydroxide (NaOH) treated biomass, the parameters were qmax = 34.6 mg/g, b= 0.08 L/mg, Kf = 5.3 and n = 2.3. The best adjusted model to the experimental equilibrium data for both untreated and sodium hydroxide (NaOH) treated biosorbent was the Langmuir model.