Nano- versus Micro-sized TiO₂: Comparative Photoelectrochemical and Photocatalytic Studies towards Organic Pollutants Oxidation in Gas Phase

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Cyclic voltammograms (CV) of TiO2 particulate electrodes under UV illumination experiments were carried out in either saturated O2 or N2 solutions for a direct correlation with the photocatalytic process. In addition, the effect of different reaction conditions on the photocatalytic efficiency under UV light in both aqueous and gaseous phases was also investigated. CV curves with the addition of acetone under UV light showed a negative shift of the photocurrent onset, confirming the efficient transfer of photoproduced reactive oxygen species (ROSs), e.g., hydroxyl radicals or holes to acetone molecules. The photocatalytic experiments showed that the two nano-sized samples exhibit the best photocatalytic performance. The different photoactivity of the larger-sized samples is probably attributed to their morphological differences, affecting both the amount and distribution of free ROSs involved in the photooxidation reaction. Finally, a direct correlation between the photocatalytic measurements in gas phase and the photo-electrochemical measurements in aqueous phase is given, thus evincing the important role of the substrate-surface interaction with similar acetone concentrations.<\/jats:p>","DOI":"10.3390\/catal11030349","type":"journal-article","created":{"date-parts":[[2021,3,9]],"date-time":"2021-03-09T09:33:51Z","timestamp":1615282431000},"page":"349","source":"Crossref","is-referenced-by-count":5,"title":["Comparative Photo-Electrochemical and Photocatalytic Studies with Nanosized TiO2 Photocatalysts towards Organic Pollutants Oxidation"],"prefix":"10.3390","volume":"11","author":[{"given":"Dami\u00e1n","family":"Monllor-Satoca","sequence":"first","affiliation":[]},{"given":"Pedro","family":"Bonete","sequence":"additional","affiliation":[]},{"ORCID":"http:\/\/orcid.org\/0000-0002-1475-5565","authenticated-orcid":false,"given":"Ridha","family":"Djellabi","sequence":"additional","affiliation":[]},{"ORCID":"http:\/\/orcid.org\/0000-0001-8536-1398","authenticated-orcid":false,"given":"Giuseppina","family":"Cerrato","sequence":"additional","affiliation":[]},{"given":"Lorenza","family":"Operti","sequence":"additional","affiliation":[]},{"ORCID":"http:\/\/orcid.org\/0000-0002-5231-8032","authenticated-orcid":false,"given":"Roberto","family":"G\u00f3mez","sequence":"additional","affiliation":[]},{"ORCID":"http:\/\/orcid.org\/0000-0002-9702-6949","authenticated-orcid":false,"given":"Claudia Letizia","family":"Bianchi","sequence":"additional","affiliation":[]}],"member":"1968","published-online":{"date-parts":[[2021,3,9]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","DOI":"10.1021\/cr5001892"},{"key":"ref2","series-title":"Titania\u2013Montmorillonite for the Photocatalytic Removal of Contaminants from Water: Adsorb & Shuttle Process., Green Materials for Wastewater Treatment","first-page":"291","author":"Djellabi","year":"2020"},{"key":"ref3","doi-asserted-by":"publisher","DOI":"10.1016\/j.mssp.2015.07.052"},{"key":"ref4","doi-asserted-by":"publisher","DOI":"10.3390\/catal9020191"},{"key":"ref5","series-title":"Transformations of Nanomaterials in the Environment","author":"Lowry","year":"2012"},{"key":"ref6","doi-asserted-by":"publisher","DOI":"10.1039\/C9TA03385H"},{"key":"ref7","doi-asserted-by":"publisher","DOI":"10.1016\/j.jes.2018.06.010"},{"key":"ref8","doi-asserted-by":"publisher","DOI":"10.1007\/s12257-010-0251-4"},{"key":"ref9","doi-asserted-by":"publisher","DOI":"10.1007\/s12011-019-01706-6"},{"key":"ref10","doi-asserted-by":"publisher","DOI":"10.1016\/j.scitotenv.2011.07.020"},{"key":"ref11","first-page":"1117","article-title":"Nanotoxicology and nanoparticle safety in biomedical designs","volume":"6","author":"Ai","year":"2011","journal-title":"Int. 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DOI: 10.3390/catal11030349