Characterization and lead(II) ions removal of modified Punica granatum L. peels |
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Authors: | Çiğdem Ay Asiye Safa Özcan Yunus Erdoğan |
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Affiliation: | 1. Department of Chemistry and Chemical Processing Technologies, Kutahya Vocational School, Dumlupinar University, Kutahya, Turkey;2. Department of Chemistry, Faculty of Science, Anadolu University, Eski?ehir, Turkey;3. Department of Chemistry, Faculty of Arts and Science, Dumlup?nar University, Kütahya, Turkey |
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Abstract: | The aim of the present study was to enhance the biosorption capacity of a waste biomass of Punica granatum L. peels (PGL) using various chemical modification agents. Among these agents, hexamethylenediamine (HMDA) indicated the best performance with regard to the improvement of lead(II) ions removal from aqueous solution. The characterization of HMDA-modified P. granatum L. peels (HMDA-PGL) was achieved by using elemental analysis, FT-IR, thermogravimetric (TG) analysis and zeta potential measurement techniques. Based on FT-IR study, the chemical modification of P. granatum L. peels take place with its carboxyl, carbonyl, hydroxyl, etc. groups and these groups are responsible for the biosorption of lead(II) ions onto modified biomass. Biosorption equilibrium and kinetic data fitted well the Langmuir isotherm and the pseudo-second-order kinetic models, respectively. The highest biosorption capacity obtained from Langmuir isotherm model was 371.36 mg g?1. Biosorption process was spontaneous and endothermic in nature according to the thermodynamic results and it quickly reached the equilibrium within 60 minutes. The validity of kinetic models used in this study can be quantitatively tested by using a normalized standard deviation Δq(%). |
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Keywords: | removal heavy metal modification characterization lead(II) ions biosorbent |
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