naa a22 4500 510752209 CHVBK 20180411083108.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s11270-013-1446-z doi (NATIONALLICENCE)springer-10.1007/s11270-013-1446-z Utilization of Passion Fruit Skin By-Product as Lead(II) Ion Biosorbent [Elektronische Daten] [Gislaine Gerola, Naiza Boas, Josiane Caetano, César Tarley, Affonso Gonçalves Jr, Douglas Dragunski] In this study, residues of passion fruit skin were examined as biosorbent materials, evaluating their capacity to adsorb lead(II) ions in in natura skin (SK-N) and two modified skins, with NaOH (SK-S) and with NaOH and citric acid (SK-SCA). The biomass characterization was done through Fourier transform infrared spectroscopy which confirmed the chemical modification by a peak at 1,730cm−1. Also, scanning electron microscopy analyses were done, where the increase of residue roughness was observed after the modification. And finally, the values of point of zero charge were determined and were lower than 5.5 for all residues. In the experiments of adsorption in function of pH, it was verified that after pH 4, the adsorbed amount was practically constant. Regarding the necessary time to reach equilibrium, the value that was found was approximately 170min, and kinetics followed the behavior described by the pseudo-second-order equation. The maximum adsorption capacity was 204mg g−1 for the SK-SCA biomass. The residues followed Langmuir adsorption model. Through thermodynamic parameters, it was verified that adsorption occurs spontaneously due to the negative values of Gibbs' energy. Moreover, desorption studies showed that adsorbed ions may be recovered in two cycles. Thus, due to the high adsorption capacity of lead ions, passion fruit skin can be utilized in filters to retain this metal in the future. Springer Science+Business Media Dordrecht, 2013 Passiflora nationallicence Metals nationallicence Adsorption nationallicence Waste nationallicence Gerola Gislaine Universidade Paranaense, UNIPAR, Praça Mascarenhas de Moraes, 87502-210, Umuarama, Paraná, Brazil aut Boas Naiza Universidade Paranaense, UNIPAR, Praça Mascarenhas de Moraes, 87502-210, Umuarama, Paraná, Brazil aut Caetano Josiane Departamento de Engenharias e Ciências Exatas, Universidade Estadual do Oeste do Paraná, UNIOESTE-PR, 85903-000, Toledo, Paraná, Brazil aut Tarley César Departamento de Química, Universidade Estadual de Londrina, UEL-PR, Rod. Celso Garcia PR 445 Km 380, 86051-990, Londrina, Paraná, Brazil aut Gonçalves Jr Affonso Centro de Ciências Agrárias, Universidade Estadual do Oeste do Paraná, UNIOESTE-PR, 85605-010, Marechal Cândido Rondon, Paraná, Brazil aut Dragunski Douglas Universidade Paranaense, UNIPAR, Praça Mascarenhas de Moraes, 87502-210, Umuarama, Paraná, Brazil aut Water, Air, & Soil Pollution Springer Netherlands 224/2(2013-02-01), 1-11 0049-6979 224:2<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1446-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1446-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gerola Gislaine Universidade Paranaense, UNIPAR, Praça Mascarenhas de Moraes, 87502-210, Umuarama, Paraná, Brazil aut NATIONALLICENCE 700 1- Boas Naiza Universidade Paranaense, UNIPAR, Praça Mascarenhas de Moraes, 87502-210, Umuarama, Paraná, Brazil aut NATIONALLICENCE 700 1- Caetano Josiane Departamento de Engenharias e Ciências Exatas, Universidade Estadual do Oeste do Paraná, UNIOESTE-PR, 85903-000, Toledo, Paraná, Brazil aut NATIONALLICENCE 700 1- Tarley César Departamento de Química, Universidade Estadual de Londrina, UEL-PR, Rod. Celso Garcia PR 445 Km 380, 86051-990, Londrina, Paraná, Brazil aut NATIONALLICENCE 700 1- Gonçalves Jr Affonso Centro de Ciências Agrárias, Universidade Estadual do Oeste do Paraná, UNIOESTE-PR, 85605-010, Marechal Cândido Rondon, Paraná, Brazil aut NATIONALLICENCE 700 1- Dragunski Douglas Universidade Paranaense, UNIPAR, Praça Mascarenhas de Moraes, 87502-210, Umuarama, Paraná, Brazil aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/2(2013-02-01), 1-11 0049-6979 224:2<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer