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Although the seminal work of Fujishima et al. dates back to 1971, TiO2 still remains the most diffused and studied semiconductor, employed in photo-oxidation processes for cleantech (i.e., polluted water and air treatment), in solar fuel production (mainly hydrogen production by water photo splitting), and in Carbon Capture and Utilization (CCU) processes by CO2 photoreduction. The eleven articles, among them three reviews, in this book cover recent results and research trends of various aspects of titanium dioxide photocatalysis, with the chief aim of improving the final efficiency of TiO2-based materials. Strategies include doping, metal co-catalyst deposition, and the realization of composites with plasmonic materials, other semiconductors, and graphene. Photocatalysts with high efficiency and selectivity can be also obtained by controlling the precise crystal shape (and homogeneous size) and the organization in superstructures from ultrathin films to hierarchical nanostructures. Finally, the theoretical modeling of TiO2 nanoparticles is discussed and highlighted. The range of topics addressed in this book will stimulate the reader’s interest as well as provide a valuable source of information for researchers in academia and industry.

UV-visible --- n/a --- oxidative reaction systems --- photodegradation --- nanospheres --- heterojunction --- Ag/AgCl@TiO2 fibers --- polymorphism --- XRD --- copper-modified titania --- ultrasonic vibration --- brookite --- TiO2 modification --- simulated Extended X-ray Adsorption Fine-Structure (EXAFS) --- nanorod spheres --- trapped electrons --- flame-spray pyrolysis --- titania/water interface --- microwave irradiation --- plasmonic photocatalyst --- graphene-TiO2 --- photocatalytic hydrogen production --- microstreaming --- B3LYP --- HRTEM --- hardness --- printing and dyeing wastewater --- SCC-DFTB --- TiO2 --- photoelectrochemistry --- titanium --- bulk defects --- methanol photo-steam reforming --- spray coating --- sol-gel --- FTIR --- S-doping --- photocatalysis --- sulfidation --- lattice defects --- polymorph --- anodization --- pine-cone TiO2 nanoclusters --- nanorod arrays --- formation mechanism --- Cu and Pt nanoparticles --- excitons --- TiO2 nanotubes --- adhesion --- trapping --- flexible substrates --- optical absorption --- large-sized films --- surface defects --- titanium dioxide --- accumulated electrons

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Catalysts are made of nanoparticles of metals, metal oxides, and other compounds that may act as active phases, support the latter, or a combination of both. The initial incentive to reduce as much as possible, up to the nano-scale, the size of the particles of active catalyst components is to maximize the surface area exposed to reactants, thus minimizing the specific cost per function and increasing the rate of conversion of feedstocks to products in relatively simple reactions. Nowadays, the interest in nanocatalyst developments has shifted to an emphasis on improving the selectivity of catalysts, allowing one to obtain desirable reactions in more complex synthetic processes. Thus, new generations of nanocatalysts should be designed at the molecular level to display well-defined structural characteristics, in terms of size, shapes, hierarchical porosity, and morphologies, as well as with controlled chemical composition. The development of efficient nanocatalysts supposes the characterization of their various surface active sites at the nanometer scale, which is focused on establishing synthesis–structure–performance relationships.

plasmonic photocatalyst --- metal nanoparticle --- N–TiO2 --- nanocomposites --- photocatalytic selective oxidation --- heterogeneous catalysis --- transition metal nitrides --- hydrogen production --- formic acid decomposition --- nickel catalyst --- calcium oxide promoter --- silica support --- Iron-based perovskites --- copper --- NO oxidation to NO2 --- NO2-assisted diesel soot oxidation --- soot oxidation under GDI exhaust conditions --- aqueous-phase reforming --- nickel --- ceria --- zirconia --- calcium --- yttrium --- methanol --- graphite --- reduced graphene oxide --- nitrogen-doped reduced graphene oxide --- exfoliation --- oxygen reduction reaction --- electrocatalysis --- UiO-66 --- iron --- cobalt --- nanocatalyst --- CO oxidation --- COProx --- methane --- oxidation catalysis --- formaldehyde --- magnetite iron oxide --- Fe3O4 --- palladium --- Pd --- silver --- Ag --- low-temperature activity --- nanocomposite --- Raman --- TG in air --- TG in hydrogen --- XRD --- electron microscopy --- EDS --- coordination polymers --- methane storage --- XRD crystallinity measurements --- mechanical shaping --- compaction --- VAM --- gas separation --- MOF pelletization --- catalysts --- dimerization --- isobutene --- olefins --- n/a