Aluminate treated Casuarina equisetifolia leaves as potential adsorbent for sequestering Cu(II), Pb(II) and Ni(II) from aqueous solution

Khan Rao, R.A. and Khatoon, A. (2017) Aluminate treated Casuarina equisetifolia leaves as potential adsorbent for sequestering Cu(II), Pb(II) and Ni(II) from aqueous solution. Journal of Cleaner Production, 165. pp. 1280-1295. ISSN 9596526

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Abstract

In the present study, a novel biosrbent was prepared by treating Casuarina equisetifolia leaves with sodium aluminate (SATCEL) and utilized for the removal of heavy metals from single and multi-metal system. The biosorbent was characterized by various different techniques. Brunauer-Emmett-Teller (BET) analysis showed increase in surface area of biosorbent from 5.902 m2 g−1 (in its raw form) to 10.582 m2 g−1 (after chemical modification). Response surface methodology (RSM) using central composite design (CCD) was employed for Optimization of process variables and evaluating their interactive effect Isotherm data were fitted in Langmuir, Freundlich, Temkin and SIPS by non-linear curve fitting. Maximum biosorption capacity (qm) calculated from Langmuir isotherm in single metal system for Cu(II), Pb(II) and Ni(II) were 44.0, 28.0 and 39.0 mg g−1, respectively. In multi-metal system competition among metal ions caused the qm values to decrease drastically. Thermodynamic parameters, standard Gibb's free energy change (ΔGo), enthalpy change (ΔHo) and entropy change (ΔSo) showed that the biosorption of metal ions onto SATCEL was spontaneous and endothermic in nature. Analysis of kinetic data showed that Pseudo-second order kinetic model was well obeyed. Regeneration study indicated that SATCEL could be reused successfully upto four consecutive cycles.

Item Type: Article
Uncontrolled Keywords: Biosorption capacity; Casuarina equisetifolia leaves; Nonlinear curve fitting; Sodium aluminate
Subjects: T Technology > T Technology (General)
Divisions: Faculties > Faculty of Engineering and Technology > Zakir Husain College of Engineering & Technology > Department of Applied Chemistry
Depositing User: AMU Library
Date Deposited: 03 Feb 2018 07:28
Last Modified: 05 Feb 2018 04:33
URI: http://ir.amu.ac.in/id/eprint/11073

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