Biochar from byproduct to high value added material – A new adsorbent for toxic metal ions removal from aqueous solutions
| Autor: | Demetrio Milea, Francesco Crea, Alberto Pettignano, Salvatore Cataldo, V. Chiodo, Susanna Maisano |
|---|---|
| Přispěvatelé: | Cataldo, Salvatore, Chiodo, Vitaliano, Crea, Francesco, Maisano, Susanna, Milea, Demetrio, Pettignano, Alberto |
| Rok vydání: | 2018 |
| Předmět: |
Speciation
020209 energy Metal ions in aqueous solution Inorganic chemistry Ionic bonding Toxic metal 02 engineering and technology 010501 environmental sciences 01 natural sciences Adsorption Biochar 0202 electrical engineering electronic engineering information engineering Materials Chemistry Toxic metals Settore CHIM/01 - Chimica Analitica Physical and Theoretical Chemistry Materials Spectroscopy 0105 earth and related environmental sciences Aqueous solution Chemistry Posidonia oceanica Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Anodic stripping voltammetry Ionic strength Pyrolysis |
| Zdroj: | Journal of molecular liquids 271 (2018): 481–489. doi:10.1016/j.molliq.2018.09.009 info:cnr-pdr/source/autori:Cataldo S.; Chiodo V.; Crea F.; Maisano S.; Milea D.; Pettignano A./titolo:Biochar from byproduct to high value added material-A new adsorbent for toxic metal ions removal from aqueous solutions/doi:10.1016%2Fj.molliq.2018.09.009/rivista:Journal of molecular liquids (Print)/anno:2018/pagina_da:481/pagina_a:489/intervallo_pagine:481–489/volume:271 |
| ISSN: | 0167-7322 |
| Popis: | An activated biochar coming from pyrolysis of dead Posidonia oceanica residues has been tested as adsorbent material for Cd2+, Pb2+ and Cu2+ ions. The biomass, the activated and the non activated biochars were previously characterized by using several instrumental techniques. The pH of metal ion solution in kinetic and thermodynamic adsorption experiments was fixed at 5 whilst, the dependence on ionic medium, ionic strength and temperature have been evaluated carrying out batch experiments at different experimental conditions. Differential Pulse Anodic Stripping Voltammetry and Inductively Coupled Plasma Optical Emission Spectroscopy have been used to measure the metal ion concentration in the solutions. Several kinetic and isotherm equations were used to fit experimental data. The thermodynamic parameters ΔG, ΔH and ΔS of Pb2+ adsorption process were calculated by using Gibbs and van't Hoff equations. A speciation study of the Pb2+ ion was also done in order to evaluate the influence of ionic medium and ionic strength on the adsorption process. Information about adsorption mechanism was obtained from the analysis of thermodynamic parameters of adsorption and of the results of metal ions speciation and biochar characterization. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect