The Pb(II) and Fe(III) biosorption capacity of chemically treated leaves of Melia azedarach L. (MAL) was
carried in batch mode. The optimum sequestration of these metal ions with NaOH and HCl treated MAL
biosorbents was observed at 5–7 pH of solution, 0.09 g of adsorbent dose, 250 rpm shaking speed, 75 mm
biosorbent sizes, 60 min of contact time and 5 mg L1 initial metal ion concentration. Pseudo
first order,
pseudo second order, Elovich and intra particle diffusion kinetic models were studied. The high values of
regression constant 0.99 revealed that sorption of Pb(II) and Fe(III) was best
fitted by pseudo second order
kinetic model. The equilibrium study was investigated by Freundlich, Langmuir, Temkin, Dubinin–
Radushkevich (D–R) and Florry–Huggins isotherms. The removal of Pb(II) and Fe(III) with NaOH and HCl
treated MAL biosorbents was best described by the Langmuir isotherm. The maximum sorption capacity
by NaOH treated biosorbent for Pb(II) and Fe(III) was 35.06 and 38.46 mg g1, respectively and by HCl
treated biosorbent for Pb(II) and Fe(III) was 28.5 and 28.57 mg g1, respectively. Characterization of the
treated MAL biosorbents was carried out by scanning electron microscopy. To check the efficiency of
NaOH and HCl treated biosorbents, experiment was conducted on textile industrial effluents.
ã2015 Elsevier Ltd. All rights reserved
The Pb(II) and Fe(III) biosorption capacity of chemically treated leaves of Melia azedarach L. (MAL) wascarried in batch mode. The optimum sequestration of these metal ions with NaOH and HCl treated MALbiosorbents was observed at 5–7 pH of solution, 0.09 g of adsorbent dose, 250 rpm shaking speed, 75 mmbiosorbent sizes, 60 min of contact time and 5 mg L1 initial metal ion concentration. Pseudofirst order,pseudo second order, Elovich and intra particle diffusion kinetic models were studied. The high values ofregression constant 0.99 revealed that sorption of Pb(II) and Fe(III) was bestfitted by pseudo second orderkinetic model. The equilibrium study was investigated by Freundlich, Langmuir, Temkin, Dubinin–Radushkevich (D–R) and Florry–Huggins isotherms. The removal of Pb(II) and Fe(III) with NaOH and HCltreated MAL biosorbents was best described by the Langmuir isotherm. The maximum sorption capacityby NaOH treated biosorbent for Pb(II) and Fe(III) was 35.06 and 38.46 mg g1, respectively and by HCltreated biosorbent for Pb(II) and Fe(III) was 28.5 and 28.57 mg g1, respectively. Characterization of thetreated MAL biosorbents was carried out by scanning electron microscopy. To check the efficiency ofNaOH and HCl treated biosorbents, experiment was conducted on textile industrial effluents.ã2015 Elsevier Ltd. All rights reserved
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