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1. L. Rimoldi. NANOSTRUCTURED OXIDES AS LEADING ACTORS FOR ENVIRONMENTAL REMEDIATION, SMART SURFACES AND ENERGY APPLICATIONS.

Degree: 2019, Università degli Studi di Milano

In the last decades, metal oxides have been widely employed in the field of nanotechnology, thanks to their physicochemical characteristics. In fact, oxidic compounds can be exploited for manifold applications due to their chemical, thermal and mechanical stability, the low-cost, the low- or non-toxicity. Moreover, the possibility to easily obtain metal oxides as nano or nanostructured powders together with their high reactivity, mainly due to the presence of polar hydroxyl groups populating the surface, have always attracted the scientific community interested in the field connected to catalysis. Among the most adopted metal oxide in materials science, titanium dioxide (TiO2), tungsten oxide (WO3), silicon dioxide (SiO2) and aluminium oxide (Al2O3) can be mentioned. Actually, the properties of the metal oxides strictly depend on their electronic structure. Some of them are semiconductors (e.g. TiO2 and WO3), while others are insulators (e.g. SiO2 and Al2O3), in dependence on the width of the energy gap between the valence and the conduction bands. Semiconductors, thanks to the relatively small band gap with respect to insulators, can be exploited for a wide number of recently developed applications in chemistry, physics and materials science. One of these applications exploited light with suitable wavelength for the promotion of electrons from the valence band to the conduction band, in order to promote reduction or oxidation reactions. This field of the physical chemistry is called photocatalysis and is the main focus of this Thesis. Photocatalysis, especially if titanium dioxide-based, can be useful for promoting a wide range of chemical reactions, e.g. hydrogen and fuels production, CO2 reduction, metal reduction/oxidation. In the last decades, photocatalysis was also proposed as an innovative and effective environmental remediation technique for the oxidative degradation of organic compounds constituting atmospheric or water pollution. In fact, photocatalysis can be able, differently from traditional remediation techniques (e.g. biological treatments, adsorption by activated carbon, …), to completely degrade the pollutants and their oxidation intermediates and by-products to harmless compounds (water, CO2, and, in case, inorganic salts). Nonetheless, photocatalysis suffers from critical issues which, nowadays, still prevent its use on a large utility-scale. Among these, the low quantum yields and, thus, efficiency of the photocatalytic process with respect to the light irradiation adopted to activate the photocatalyst, the need of UV light to activate large band gap semiconductors, such as TiO2, and the high costs for the removal of the photocatalyst from the polluted effluent once the remediation treatment has been performed. This Thesis is divided into three different parts, on the grounds of the materials studied and their final application. In Part I (Chapters 1–7), TiO2-based materials for photocatalysis, variably modified and engineered by adopting different strategies for the promotion of specific… Advisors/Committee Members: tutor: S. Ardizzone, coordinatore: E. Licandro, ARDIZZONE, SILVIA, LICANDRO, EMANUELA.

Subjects/Keywords: Settore CHIM/02 - Chimica Fisica

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APA (6th Edition):

Rimoldi, L. (2019). NANOSTRUCTURED OXIDES AS LEADING ACTORS FOR ENVIRONMENTAL REMEDIATION, SMART SURFACES AND ENERGY APPLICATIONS. (Thesis). Università degli Studi di Milano. Retrieved from http://hdl.handle.net/2434/612084

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Rimoldi, L.. “NANOSTRUCTURED OXIDES AS LEADING ACTORS FOR ENVIRONMENTAL REMEDIATION, SMART SURFACES AND ENERGY APPLICATIONS.” 2019. Thesis, Università degli Studi di Milano. Accessed February 22, 2019. http://hdl.handle.net/2434/612084.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Rimoldi, L.. “NANOSTRUCTURED OXIDES AS LEADING ACTORS FOR ENVIRONMENTAL REMEDIATION, SMART SURFACES AND ENERGY APPLICATIONS.” 2019. Web. 22 Feb 2019.

Vancouver:

Rimoldi L. NANOSTRUCTURED OXIDES AS LEADING ACTORS FOR ENVIRONMENTAL REMEDIATION, SMART SURFACES AND ENERGY APPLICATIONS. [Internet] [Thesis]. Università degli Studi di Milano; 2019. [cited 2019 Feb 22]. Available from: http://hdl.handle.net/2434/612084.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rimoldi L. NANOSTRUCTURED OXIDES AS LEADING ACTORS FOR ENVIRONMENTAL REMEDIATION, SMART SURFACES AND ENERGY APPLICATIONS. [Thesis]. Università degli Studi di Milano; 2019. Available from: http://hdl.handle.net/2434/612084

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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