| Title | Amorphous boron-doped sodium titanates hydrates: Efficient and reusable adsorbents for the removal of Pb(2+) from water. |
| Abstract | Amorphous titanium hydroxide and boron-doped (B-doped) sodium titanates hydrates were synthetized and used as adsorbents for the removal of Pb(2+) from water. The use of sodium borohydride (NaBH4) and titanium(IV) isopropoxide (TTIP) as precursors permits a very easy synthesis of B-doped adsorbents at 298K. The new adsorbent materials were first chemically characterized (XRD, XPS, SEM, DRIFT and elemental analysis) and then tested in Pb(2+) adsorption batch experiments, in order to define kinetics and equilibrium studies. The nature of interaction between such sorbent materials and Pb(2+) was also well defined: besides a pure adsorption due to hydroxyl interaction functionalities, there is also an ionic exchange between Pb(2+) and sodium ions even working at pH 4.4. Langmuir model presented the best fitting with a maximum adsorption capacity up to 385mg/g. The effect of solution pH and common ions (i.e. Na(+), Ca(2+) and Mg(2+)) onto Pb(2+) sorption were also investigated. Finally, recovery was positively conducted using EDTA. Very efficient adsorption (>99.9%) was verified even using tap water spiked with traces of Pb(2+) (50ppb). |
| Source | Journal of hazardous materials (Print) 324, pp. 168–177 |
| Keywords | Titanium hydroxidesAdsorptionIonic exchangeMetal removal |
| Journal | Journal of hazardous materials (Print) |
| Editor | Elsevier, New York ;, Paesi Bassi |
| Year | 2017 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.jhazmat.2016.10.046 |
| Authors | di Bitonto, Luigi; Volpe, Angela; Pagano, Michele; Bagnuolo, Giuseppe; Mascolo, Giuseppe; La Parola, Valeria; Di Leo, Paola; Pastore, Carlo |
| Text | 362166 2017 10.1016/j.jhazmat.2016.10.046 ISI Web of Science WOS 000390182600006 Scopus 2 s2.0 85002410363 PubMed 27776867 Titanium hydroxides Adsorption Ionic exchange Metal removal Amorphous boron doped sodium titanates hydrates Efficient and reusable adsorbents for the removal of Pb 2 from water. di Bitonto, Luigi; Volpe, Angela; Pagano, Michele; Bagnuolo, Giuseppe; Mascolo, Giuseppe; La Parola, Valeria; Di Leo, Paola; Pastore, Carlo a CNR IRSA, Via de Blasio 5, Bari BA , Italy b CNR ISMN, Via U. La Malfa, 153, Palermo PA , Italy c CNR IMAA, Via S. Loja, Tito Scalo PZ , Italy Amorphous titanium hydroxide and boron doped B doped sodium titanates hydrates were synthetized and used as adsorbents for the removal of Pb 2 from water. The use of sodium borohydride NaBH4 and titanium IV isopropoxide TTIP as precursors permits a very easy synthesis of B doped adsorbents at 298K. The new adsorbent materials were first chemically characterized XRD, XPS, SEM, DRIFT and elemental analysis and then tested in Pb 2 adsorption batch experiments, in order to define kinetics and equilibrium studies. The nature of interaction between such sorbent materials and Pb 2 was also well defined besides a pure adsorption due to hydroxyl interaction functionalities, there is also an ionic exchange between Pb 2 and sodium ions even working at pH 4.4. Langmuir model presented the best fitting with a maximum adsorption capacity up to 385mg/g. The effect of solution pH and common ions i.e. Na , Ca 2 and Mg 2 onto Pb 2 sorption were also investigated. Finally, recovery was positively conducted using EDTA. Very efficient adsorption >99.9% was verified even using tap water spiked with traces of Pb 2 50ppb . 324 Published version http //www.sciencedirect.com/science/article/pii/S0304389416309670 Amorphous boron doped sodium titanates hydrates Efficient and reusable adsorbents for the removal of Pb2 from water Journ Haz Mater 324 2017 168.pdf Articolo in rivista Elsevier 0304 3894 Journal of hazardous materials Print Journal of hazardous materials Print J. hazard. mater. Print Journal of hazardous materials. Print DI BITONTO LUIGI paola.dileo DI LEO PAOLA angela.volpe VOLPE ANGELA valeria.laparola LA PAROLA VALERIA carlo.pastore PASTORE CARLO michele.pagano PAGANO MICHELE giuseppe.bagnuolo BAGNUOLO GIUSEPPE giuseppe.mascolo MASCOLO GIUSEPPE TA.P07.014.008 Recupero di metalli pesanti da acque reflue TA.P06.006.006 GdR Metodologie Integrate per lo studio di suolo e sottosuolo |
