1
|
Pargoletti E, Mostoni S, Rassu G, Pifferi V, Meroni D, Falciola L, Davoli E, Marelli M, Cappelletti G. Zn- vs Bi-based oxides for o-toluidine photocatalytic treatment under solar light. Environ Sci Pollut Res Int 2017; 24:8287-8296. [PMID: 28160178 DOI: 10.1007/s11356-017-8430-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Accepted: 01/09/2017] [Indexed: 06/06/2023]
Abstract
The photodegradation of the highly toxic o-toluidine pollutant was deeply investigated both under UV and solar irradiations by using three different semiconductors: pure ZnO, Bi-impregnated ZnO, and Bi2O3 nanopowders (synthesized by precipitating method). All the samples were deeply characterized on structural, morphological, surface, and optical points of view. The disappearance and the relative mineralization of o-toluidine molecules were followed by linear sweep voltammetry (LSV) and total organic carbon (TOC) determinations, respectively. Hence, correlations between their physico-chemical properties and the photocatalytic performances, passing from UV to solar light, were drawn and a hypothesis on the photodegradation mechanism has been proposed, on the basis of the HPLC/MS results. Bare Bi2O3 samples, due to the exploitation of both their visible light absorption and the negligible intermediates formation, resulted to be higher performing under solar irradiation than either pure or Bi-doped ZnO nanopowders. Graphical abstract.
Collapse
Affiliation(s)
- E Pargoletti
- Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133, Milan, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121, Florence, Italy
| | - S Mostoni
- Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133, Milan, Italy
- Dipartimento di Scienza dei Materiali, Università degli Studi di Milano Bicocca, via Roberto Cozzi 55, 20125, Milan, Italy
| | - G Rassu
- Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133, Milan, Italy
| | - V Pifferi
- Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133, Milan, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121, Florence, Italy
| | - D Meroni
- Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133, Milan, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121, Florence, Italy
| | - L Falciola
- Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133, Milan, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121, Florence, Italy
| | - E Davoli
- IRCCS Istituto di Ricerche Farmacologiche "Mario Negri", Via La Masa 19, 20156, Milan, Italy
| | - M Marelli
- CNR-ISTM/ISTeM, via Fantoli 15/16, 20138, Milan, Italy
| | - G Cappelletti
- Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133, Milan, Italy.
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), via Giusti 9, 50121, Florence, Italy.
| |
Collapse
|