ADSORPTION OPTIMIZATION OF LEAD (II) USING SACCHARUM BENGALENSE AS A NON-CONVENTIONAL LOW COST BIOSORBENT: ISOTHERM AND THERMODYNAMICS MODELING

作者：Din Muhammad Imran; Hussain Zaib^*; Mirza Muhammad Latif; Shah Asma Tufail; Athar Muhammad Makshoof

来源：International Journal of Phytoremediation, 2014, 16(9): 889-908.

DOI：10.1080/15226514.2013.803025

• biosorption
• kinetics
• lead
• thermodynamics

In the present study a novel biomass, derived from the pulp of Saccharum bengalense, was used as an adsorbent material for the removal of Pb (II) ions from aqueous solution. After 50 minutes contact time, almost 92% lead removal was possible at pH 6.0 under batch test conditions. The experimental data was analyzed using Langmuir, Freundlich, Timken and Dubinin-Radushkevich two parameters isotherm model, three parameters RedlichPeterson, Sip and Toth models and four parameters Fritz Schlunder isotherm models. Langmuir, RedlichPeterson and Fritz-Schlunder models were found to be the best fit models. Kinetic studies revealed that the sorption process was well explained with pseudo second-order kinetic model. Thermodynamic parameters including free energy change (G degrees), enthalpy change (H degrees) and entropy change (S degrees) have been calculated and reveal the spontaneous, endothermic and feasible nature of the adsorption process. The thermodynamic parameters of activation (G(#), H(#)and S-#) were calculated from the pseudo-second order rate constant by using the Eyring equation. Results showed that Pb (II) adsorption onto SB is an associated mechanism and the reorientation step is entropy controlled.

• 出版日期2014-9-2