Efficiency of an activated carbon prepared by successive activation with NH4NO3 and NaOH in removal of Pb(II) from aqueous solutions

meknati, alireza Efficiency of an activated carbon prepared by successive activation with NH4NO3 and NaOH in removal of Pb(II) from aqueous solutions. Other. gonabad university of medical sciences.

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Abstract

Background and Objectives: Pb(II) is a dangerous metal ion for human health and the environment. Therefore, its removal from water and wastewater and preventing its emission into the environment with suitable method is of great importance. In this work, successive chemical activation using NH4NO3 and NaOH was utilized as a novel method for preparation of a new activated carbon for removal of Pb(II) ions from aqueous solutions. Materials and Methods: For this purpose, effect of pH, contact time, sorbent dose, initial concentration, temperature, and agitation speed were investigated, using batch sorption method. The equilibrium experimental data were evaluated using Langmuir, Freundlich, Redlich-Peterson, Tempkin , Dubinin–Radushkevich, Sips and Toth Models equations. Also, in order to determine the best kinetic model for adsorption of lead ions on activated carbon prepared by successive chemical activation using NH4NO3 and NaOH, the kinetic experimental data were fitted with Pseudo-first order, Pseudo-second order, Ritchie and Elovich models. Results: The experimental results showed that the highest removal performance of the newly prepared activated carbon occurs in pH 6.0. Also the results exhibited that removal efficiency of lead ions increases with increasing sorbent dose, temperature, contact time, and agitation speed, while increase in initial lead concentration decreased the removal percentage. The sorption process of Pb(II) onto the new activated carbon was found to obey from both pseudo-second-order rate equation and Ritche model. Moreover, the equilibrium experimental data showed a good fit with Langmuir, Redlich-Peterson, sips and Toth isotherm models. The maximum sorption capacity of 190/24 mg g−1 was achieved under optimized conditions and ambient temperature, using Langmuir model. The thermodynamic values obtained in this study revealed that the sorption process was endothermic and spontaneous, and sorption at higher temperatures was more feasible. Conclusion: Overall, the obtained results demonstrated that preparation of activated carbon via successive chemical activation with NH4NO3 and NaOH is suitable and beneficial for removing lead ions from waters and wastewaters. Keywords: Lead ion; Sorption; Ammonium nitrate; Sodium hydroxide

Item Type: Monograph (Other)
Subjects: R Medicine > RA Public aspects of medicine
Depositing User: Unnamed user with email eprints@gmu.ac.ir
Date Deposited: 04 Nov 2019 09:33
Last Modified: 04 Nov 2019 09:33
URI: http://eprints.gmu.ac.ir/id/eprint/1271

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