0000000001167590
AUTHOR
Elisa Isabel Garcia Lopez
TiO2 thin films: preparation, characterisation and their photocatalytic activity
Titania-Silica Mesoporosa per l’ossidazione Parziale Fotocatalitica di Propilene in Regime Gas-Solido
Photocatalytic activity of titanium dioxide thin films prepared by a sol-gel method
Comparison between catalytic and photocatalytic activity in gas-solid regime of semiconductor oxides and carbon nanotubes supported Keggin heteropolyacid.
Catalytic and photocatalytic 2-propanol dehydration was carried out by using a supported Keggin heteropolyacid H3PW12O40 (PW12). Binary materials were prepared by impregnation and/or solvothermal treatment by using commercial supports: SiO2 (Mallinckrodt), TiO2 (Evonik P25) and multiwall carbon nanotubes (Sunnano) or home solvothermically prepared SiO2 and TiO2. All the materials have been characterized by X-ray diffraction (XRD), scanning electron microscopy observations (SEM) coupled with EDX microanalysis, specific surface area measurements, diffuse reflectance spectroscopy (DRS), FTIR and Raman spectroscopy. (Photo)catalytic 2-propanol dehydration was studied in gas-solid regime by usin…
Adsorption and Photocatalytic Degradation of Acetonitrile on TiO2: FTIR and Kinetic Studies
Ossidazione mediante fotocatalisi e ozonizzazione dello ione ossalato in soluzioni acquose contenenti biossido di titanio
Selective heterogeneous photocatalysis: examples of green photosyntheses
Degradation of Drugs in Aqueous Medium: Photocatalytic oxidation of Lincomycin
Titania Photocatalysts for Selective Oxidations in Water
Heterogeneous photocatalysis by polycrystalline semiconductor oxides is an unconventional technology that has been mainly applied for the degradation of organic and inorganic pollutants in both the vapor and liquid phase. The application of photocatalysis in synthetic routes has also been researched in recent years, demonstrating its viability as an alternative route in organic chemistry. This work illustrates the main findings in the application of heterogeneous photocatalysis to the oxidation of organic compounds dissolved in water, free of any organic co-solvent. Two main aspects of the oxidative process have been studied: the first one is the partial oxidation of various mono-substitute…
TiO2-H3PW12O40 binary solids prepared in different conditions: a comparison of their photocatalytic activity
Synthesis, Characterisation and Photocatalytic Tests of Anatase Titanium Dioxide Powders Prepared Via Sol-Gel with Different Chelating Agents and under Different Gelling Pressure Conditions
Binary Materials TiO2 or ZnO-Activated Carbon Used as Photomediators in the Photocatalytic Degradation of 2-Propanol in Gas-Solid Regime
CO2 Reduction in Gas-Solis Regime by Using GaP/TiO2 as Photocatalyst
Cyanuric Acid Oxidationi in UV Irradiated ZnO Suspensions
The role of different oxides as supports of an heteropolyacid in the catalytic and catalytic photo-assisted propene hydration
Preparation, Characterisation and Photocatalytic activity of SrTiO3 based Perovskites.
Polycrystalline TiO2 impregnated with porphyrin derivatives in the photocatalytic degradation of 4-nitrophenol
Photocatalytic degradation of organic pollutants by using polycrystalline TiO2: case studies for environment remediation
Photodegradation of lincomycin in aqueous solutions
TiO2-Anatase powders for photocatalytic applications: sol-gel synthesis and relative thermal characterization
Comparison of Different Photocatalytic Systems for Acetonitrile Degradation in Gas-Solid Regime
Role of the support on the activity of H3PW12O40 supported on SiO2 or TiO2 in Catalytic and Photocatalytic propene hydration: An EPR Study
Catalytic and catalytic photo-assisted hydration of propene to 2-propanol in gas-solid regime at atmospheric pressure and 85°C were carried out by using the Keggin heteropolyacid (HPA) H3PW12O40 (PW12) supported on home prepared SiO2, WO3, TiO2 or N-doped TiO2. The HPA played the key role both in catalytic and photocatalytic reactions; however, the support strongly influenced the binary material performance. The contemporary presence of heat and UV light improved the activity of the (photo)catalysts. EPR (Electron Paramagnetic Resonance) has been used to understand the intimate mechanism underlying the photoactivity of the supported heteropolyacid and the role played by the support.
Mineralización fotocatalítica de heterociclos aromáticos y alicíclicos que contienen nitrógeno: relación entre productos de reacción que contienen nitrógeno y estructura del substrato
Cobalt in strontium titanate based perovskites: preparation, characterization and role in the photocatalytic propene partial oxidation
Strontium titanate perovskite (SrTiO3) and analogous materials in which Y partially substitutes Sr have been prepared as basis to integrate Co in the structure. The Co inserrtion has been performed by wet impregnation or coprecipitation methods. The obtained powders have been physico-chemically characterized and tested as photocatalysts in the propene partial oxidation by using a solar simulating reactor. Correlation between photocatalytic performance and physicochemical characteristics of the different catalysts allows to assess a key role of local nanostructuring of CoOx sites on the selectivity and distribution of products.
Preparation, Characterization of rutile obtained by hydrolisis of TiCl4
Film di TiO2 da idrolisi di TiCl4: preparazione, caratterizzazione e fotoattività
Preparazione di TiO2 nanostrutturato a partire da TiCl4.
H3PW12O40 supportato per l'idratazione di propene in regime gas-solido: attività catalitica e catalitica fotoassistita
Photocatalytic CO2 reduction in gas-solid regime in the presence of bare or Cu-loaded TiO2 and water
On the Photoisomerization of Caffeic Acid in the Presence of Nanostructured TiO2
Photocatalytic partial oxidation of propylene in the presence of mesoporous organosilane-modified titanias
Studies on Catalytic and catalytic photo-assisted propene hydration in the presence of H3PW12O40 supported on different oxides
Selectivity of hydroxyl radical in the partial oxidation of aromatic compounds in heterogeneous photocatalysis
Abstract The photocatalytic oxidation of different benzene derivatives has been investigated in order to understand how the substituent group affects the selectivity to hydroxylated compounds. Experimental runs were performed by using TiO2 (Merck) aqueous suspensions at natural pH irradiated by near-UV light. The organic molecules used as substrate contained an electron withdrawing group (EWG) (nitrobenzene, cyanobenzene, benzoic acid, 1-phenylethanone), an electron donor one (EDG) (phenol, phenylamine, N-phenylacetamide) or both an EWG and an EDG (4-chlorophenol). The results clearly indicated that the primary photocatalytic oxidation of aromatic compounds containing an EDG gives rise main…
Perovskiti a base SrTiO3: Preparazione, caratterizzazione ed attività fotocatalitica in regime gas-solido
TiO2-induced photoisomerization of caffeic acid
TRMC, XPS, EPR Characterisations of Polycrystalline TiO2 Porphyrin Impregnated Powders and their Catalytic Activity for 4-Nitrophenol Photodegradation in Aqueous Suspensio
TiO2 Nanomaterials Used as Photocatalysts for Selective Heterogeneous Syntheses of Alcohols to Aldehydes in Water
Synthesis, Characterisation and Photocatalytic Degradation of 4-Nitrophenol in Aqueous Phase by Using TiO2 Powders Prepared via Sol-Gel Method under Different Gelling Pressure Conditions
COMPARISON OF THE PHOTOCATALYTIC DEGRADATION OF 2-PROPANOL IN GAS-SOLID AND LIQUID-SOLID SYSTEMS BY USING TiO2 – LnPc2 HYBRID POWDERS
Photocatalytic degradation of 2-propanol was carried out as a probe reaction both in gas–solid and in liquid–solid systems in the presence of TiO2 both bare and impregnated with lanthanide (Sm, Gd, Ho) bis-phthalocyanines (LnPc2) used as sensitizers. Continuous and batch photo-reactors, irradiated with an equal flux of photons, were used in gas–solid and in liquid–solid systems, respectively. Propanone and acetaldehyde were the main intermediates found in both systems during 2-propanol oxidation, whereas carbon dioxide and water were the final oxidation products exclusively in the gas–solid regime. The photocatalysts exhibited significantly higher activity in the liquid–solid system than in…
H2 and value added chemicals from photocatalytic conversion of glucose
Commercial and home prepared bare and Pt-supported TiO2 samples were used as the photocatalysts for the aqueous aerobic and anaerobic photo-conversion of glucose at ambient pressure and temperature. H2 and valuable chemicals were the obtained products. The home prepared samples resulted more active than the commercial ones
2-propanol formation by propene hydration: Catalytic and catalytic photo- assisted reaction using H3PW12O40 supported on TiO2 and SiO2.
Photocatalytic oxidatioon of acetonitrile : degradation performance in gas-solid and liquid-solid systems
Ossidazione fotocatalitica del glucosio in presenza di TiO2
Studio di processi fotocatalitici: dalla preparazione del fotocatalizzatore alla comprensione della cinetica e del meccanismo di reazione
New TiO2 based photocatalysts for the degradation of organic pollutants in water
Photocatalytic Oxidation of Acetonitrile
Oxidación Fotocatalítica de Acetonitrilo en Regimen Gas-Sólido y Líquido-Sólido
Ossidazione del 2-Propanolo Fotocatalizzata da Sistemi Ibridi Bis-Ftalocianina Lantanide-TiO2:Confronto tra Processi Gas-Solido e Liquido-Solido
Role of the support and pseudo-liquid phase in the Phosphotungstic Heteropolyacid (photo)catalytic activity
Catalytic and photocatalytic tests for propene hydration to 2-propanol were successfully carried out by using binary materials obtained by supporting a Keggin or Wells-Dawson heteropolyacids via impregnation method to commercial SiO2 or TiO2. (Photo)catalytic hydration was studied in gas-solid regime by using a continuous (photo)reactor working at atmospheric pressure and 80 °C. The alcohol was the main product. The acidity of the cluster accounts for the catalytic role, whereas both the acidity of the cluster and the oxidant ability were responsible for the increase of the reaction rate of the photo-assisted catalytic reaction. Moreover, the presence of a photoactive semiconductor support …
Photocatalytic conversion of glucose in aqueous suspensions of heteropolyacid-TiO2 composites.
Photocatalytic conversion of glucose was carried out in aqueous suspensions in the presence of dfifferent commercial and home prepared TiO2 samples functionalized with a commercial heteropolyacid. Different reaction extents and distribution of intermediate oxidation products were observed depending on the photocatalyst.
Sintesi e caratterizzazione di polveri e film di TiO2
Studio della Fotodegradazione di Antibiotici in Ambiente Acquoso
Photocatalytic degradation of 4-nitrophenol in aqueous suspension by using polycrystalline TiO2 impregnated with lanthanide double-decker phthalocyanine complexes
The photocatalytic activity of polycrystalline TiO2 samples impregnated with rare-earth-metal diphthalocyanines was investigated. The 4-nitrophenol (4-NP) photocatalytic degradation in aqueous suspension was used as a probe reaction. Commercial anatase TiO2 was impregnated with home-prepared double-decker phthalocyanine complexes of the lanthanide metals, such as Ce, Pr, Nd, Sm, Ho, and Gd. In particular, the impregnation with Ho, Sm, and Nd complexes, acting as sensitizers, proved beneficial for the photoactivity of the studied systems. Significant improvements of the TiO2-based catalytic system appeared possible in terms of lower impregnation loading, enhanced photoreactivity under solar …
A Study on the Influence of the Presence of Activated Carbon in TiO2 and ZnO Photo-Assisted Degradation of 2-Propanol
Preparazione, caratterizzazione e attività fotocatalitica sotto luce solare naturale di perovskiti La1-xSrxCo1-yFeyO3-
Preparation in mild conditions of photocatalitically active nanostructured TiO2 rutile
Photocatalytic mineralization of N-containing alicyclic and aromatic heterocycles: Relationship between products containing nitrogen and structure of the substrate
Green Organic Reactions by TiO2 Photocatalysis
This contribution gives an account of TiO2-based selective photocatalysis as a green synthetic tool for the production of organics. Some case studies of the most common transformations carried out by means of photocatalytic reactions are illustrated.
Synthetic Green Chemistry through Heterogeneous Photocatalysis
This contribution deals with a short review of some application of TiO2 to green organic synthesis. In particular to selective oxidation of aromatic alcohols under mild conditions.
Selective Photocatalytic Production of Aldehydes
Polycrystalline TiO2 Powders Impregnated with Porphyrins Used for the Photocatalytic Degradation of 4-Nitrophenol
"Caratterizzazione ottica di sospensioni acquose di fotocatalizzatori utilizzati in processi di abbattimento di inquinanti organici
Mechanistic aspects of oxalic acid oxidation by photocatalysis and ozonation
Preparazione, Caratterizzazione e Fotoattività di Film di TiO2
Preparation and characterization of photocatalytic TiO2 films
SrTiO3 Based Perovskites: Preparation, Characterization and Photocatalytic Activity in Gas-Solid Regime
Degradazione Fotocatalitica Eterogenea di Acetonitrile e Toluene in Regime Gas-Solido e Liquido-Solido
Photocatalytic activity in gas–solid regime of ZnO-ZnAl2O4 composites
La1−xSrxCo1−yFeyO3− perovskites: Preparation, Characterization and Solar Photocatalytic Activity
Degradación fotocatalítica de 2-Propanol en régimen gas-sólido utilizando como fotocatalizadores materiales binarios TiO2-carbón activo y ZnO-carbón activo
Photocatalytic activity of TiO2 thin films prepared in the presence of organic and inorganic additives
Preparation and Photoactivity of Rutile Obtained by Hydrolysis of TiCl4
Photodegradation of Lincomycin in aqueous TiO2 suspension by using artificial or solar light
Photoassisted mineralization of N-bearing heterocycles at the TiO2/H2O interfaces
Degradation of Lincomycin in Aqueous Medium: Coupling of Solar Photocatalysis and Membrane Separation
Porphyrin cardanol based impregnated polycriystalline TiO2 samples in the photocatalytic degradation of 4-nitrophenol
TiO2 Heterogeneous Photocatalysis as a Selective Tool for Organic Green Syhtneses
Photocatalytic abatement of organic compounds using home prepared TiO2 as photocatalysts
TiO2 Impregnated with Polyoxometallate as Photomediator in 2-Propanol Gas-Solid Regime Photocatalytic Degradation
Confronto tra attività catalitica e fotocatalitica dell’eteropoliacido di Keggin H3PW12O40 supportato su ossidi o su nanotubi di carbonio
Catalytic and catalytic photo-assisted dehydration of 2-propanol to form propene in gas-solid regime at atmospheric pressure and 80°C was carried out by using a Keggin heteropolyacid H3PW12O40 (PW12) supported on different oxides. Binary materials have been prepared by impregnation of PW12 on different commercial and home prepared supports (TiO2, SiO2 or carbon nanotubes). The supported Keggin PW12 species played a key role both for the catalytic and the photo-assisted catalytic reactions, due to their strong acidity and ability to form strong oxidant species under UV irradiation, respectively. The contemporary presence of heat and UV light improved the activity of almost all POM supported …
Surface characterization of metal ions loaded TiO2 photocatalysts: structure-activity relationship
Transition metal loaded TiO2 powders were characterised and tested for the photodegradation of some organic acids. Both Lewis and Brønsted surface acid sites were present in the samples containing large amounts of Mo, V and W. The Brønsted sites are associated to the presence of the transition metals as they do not exist in the unloaded support, and in particular to the presence of these metals in high oxidation states. The trend of the pzc values of the various powders matches rather well both with the surface acidity of the samples experimentally determined by NH3 adsorption and with a scale of acidity/basicity for bulk binary oxides. XPS investigation indicates that only the presence of …
Selective Heterogeneous Photocatalysis: Achievements and Challenges
Preparation, characterisation and photoactivity of nanostructured TiO2 catalysts
Comparison between catalytic and catalytic photo-assisted propene hydration by using supported polyoxometalate.
Photoassisted Mineralization of N-Heterocycles in TiO2 Aqueous Suspensions: Fate of the N-Heteroatoms
A study on the catalytic perfomances of H3PW12O40 supported on TiO2 and SiO2 for propene hydration in the presence and in the absence of UV light
Photocatalytic Oxidation of Drugs by Using Artificial and Solar Irradiation
Studio dell’Influenza del Carbonio Attivo sulla Degradazione Fotocatalitica del 2-Propanolo Condotta in Presenza di Biossido di Titanio o di Ossido di Zinco
Photo-assisted Degradation of 2-Propanol in Gas-Solid Regime by Using TiO2 Impregnated with Heteropolyacids H3PW12O40
Commercial and home prepared TiO2 samples impregnated with tungstophosphoric acid (H3PW12O40) were used for the photo-assisted degradation of 2-propanol in gas–solid regime. The characterization results evidenced a good coverage of the polyoxometalate (POM) onto the surface of TiO2 along with a marginal effect of the presence of the POM on the specific surface area, morphology and cristallinity of the samples. Propene was the main intermediate product revealed in 2-propanol photocatalytic degradation by using as photocatalysts the samples containing the POM, whereas propanone wasmainly obtained when the photocatalysts was bare TiO2, both commercial or home prepared. Acetaldehyde was also fo…
Ossidazione fotocatalitica di benzonitrile in sospensioni acquose di biossido di titanio
Influence of activated carbon in the TiO2 mediated photo-assisted degradation of 2-propanol in gas-solid regime
Attività catalitica e fotocatalitica di eteropoliacidi Wells-Dawson e Keggin per la disidratazione del 2-propanolo in regime gas-solido
Tra i più studiati poliossometallati (nanoagglomerati di ossigeno con metalli transizionali), figurano gli eteropoliacidi (EPA) che sono degli acidi inorganici forti con ben defin ite strutture molecolari. In funzione della loro geometria, essi vengono classificati come Keggin e Wells-Dawson. Gli (EPA) sono usati in catalisi omogenea ed eterogenea e funzionano anche come fotocatalizzatori, essenzialmente in sistemi omogenei. Questi materiali sono, inoltre, economici e non tossici.
Zn,Al hydrotalcites calcined at different temperature: Characterisation and photocatalytic activity for the degradation of 2-propanol in gas-solid regime
GaP/TiO2 Composite Photocatalyst for CO2 Reduction in Gas-Solid Regime under Simulated Solar Light Irradiation
Preparation, Characterisation and Photocatalytic Activity of Zn,Al Oxides Derived from Zn,Al LDHs
Selective (photo)catalytic formation of 2-propanol from propene by using an heteropolyacid supported on different oxides
Influenza del Sostituente sulla Ossidazione Fotocatalitica Selettiva di Composti Aromatici
La1−xSrxCo1−yFeyO3− perovskites: Preparation, Characterization and Solar Photocatalytic Activity in gas-solid regime
Comparison of activity in the 2-propanol dehydration of supported heteropolyacid (photo)catalysts at the gas-solid interface
Catalytic and photocatalytic tests for 2-propanol dehydration to propene were successfully carried out by using binary materials obtained by supporting a Keggin heteropolyacid H3PW12O40 (PW12) via impregnation method and/or solvothermal treatment. The supports used were commercial SiO2 (Mallinckrodt), TiO2 (Evonik P25) and multiwall carbon nanotubes (Sunnano) or home solvothermically prepared SiO2 and TiO2. (Photo)catalytic 2-propanol dehydration was studied in gas-solid regime by using a continuous (photo)reactor working at atmospheric pressure and 80 °C. the reaction was also studied by performing FTIR spectra of the gas-phase over the HPA-support composites, where the 2-propanol had been…
Heterogeneous photocatalysis: optical characterisation of polycrystalline photocatalysts for pollutant degradation in aqueous medium
Nanomateriali a base di TiO2 come fotocatalizzatori per sintesi selettive di alcoli ad aldeidi in fase acquosa
Photocatalytic oxidation of benzonitrile in aqueous suspensions of titanium dioxide
Green Production of Aldehydes from Alcohols by Heterogeneous Photocatalysis
Preparation, characterization and photocatalytic activity of TiO2 rutile
Photocatalytic Oxidation of Acetonitrile in Aqueous Suspension of Titanium Dioxide Irradiated by Sunlight
Oxidación Fotocatalítica del Acetonitrilo en Régimen Gas-Sólido y Líquido-Sólido
Optical Characterisation of Semiconductors Used as Photocatalysts for the Degradation of Organic Pollutans in Acqueous Medium
Preparazione di Fotocatalizzatori Nanostrutturati a Base di TiO2
Preparation of Photoactive Polycrystalline Titanium Dioxide
P46: ADSORPTION AND PHOTOCATALYTIC DEGRADATION OF ACETONITRILE ON TiO2: FT-IR AND KINETIC STUDIES
Heterogeneous Photocatalysis: a Promising Tool for Green Organic Syntheses
The present work deals with a short review of some applications of photocatalysis to green organic synthesis of valuable products in mild experimental conditions and in the presence of water as solvent.
Preparazione e caratterizzazione di film fotocatalitici
Lanthanide Diphthalocyanine – Photosensitizers in TiO2 Hybrid Catalytic Systems: Green Chance for The Nature
Keggin and Wells-Dawson supported heteropolyacids as heterogeneous (photo)catalysts for gas-solid 2-propanol dehydration
Catalytic and photocatalytic tests for 2-propanol dehydration to propene were successfully carried out by using binary materials obtained by supporting a Keggin or Wells-Dawson heteropolyacids via impregnation method to commercial SiO2 or TiO2. (Photo)catalytic 2-propanol dehydration was studied in gas-solid regime by using a continuous (photo)reactor working at atmospheric pressure and 80 °C. Propene and diisopropyl ether were the main reaction products. For the continuous photo-assisted runs the reactor was also illuminated with UV light. The heteropolyacid species played a key role both for the catalytic and the photo-assisted catalytic reactions; indicating that the acidity of the clust…
TiO2 Nanocristalline samples used to photo-oxidize aromatic alcohols to aldehydes
H3PW12O40 SUPPORTED ON DIFFERENT OXIDES: INFLUENCE OF THE SUPPORT ON THE CATALYTIC AND CATALYTIC PHOTO-ASSISTED PROPENE HYDRATION
Efecto de la Fotocatálisis Heterogenea y la Ozonización sobre la Oxidación del Ion Oxalato en Suspensión Acuosa de TiO2
Reazione catalitica e fotocatalitica di disidratazione in fase gas-solido del 2-propanolo in presenza di eteropoliacidi "Keggin" e "Wells-Dawson" supportati
La disidratazione catalitica e fotocatalitica di 2-propanol a propilene è stata effettuata usando eteropoliacidi di Keggin H3PW12O40 (PW12) e Wells-Dawson H6P2W18O60 (P2W18). Sono stati utilizzati sia supportani che non. Materiali binari sono stati preparati per l'impregnazione degli eteropoliacidi su supporti commerciali: SiO2 (Aldrich) e TiO2 (Evonik P25). I materiali sono stati caratterizzati e la loro (foto) attività catalitica rispetto alla disidratazione 2-propanol evaluata in regime gas-solido utilizzando un reattore continuo a pressione atmosferica e un range di temperatura fra 60 e 120 ° C. Inoltre, per gli esperimenti fotoassititi il reattore è stato illuminato da un LED UV. Impor…
Riduzione Fotocatalitica di CO2 in Presenza di Catalizzatori Compositi GaP/TiO2
Preparation of photocatalytic nanostructured TiO2 thin films
Carbon and nitrogen-doped TiO2: preparation, characterisation and visible light photocatalytic activity
Photolytic and TiO2-Assisted Photodegradation of Aqueous Solutions of Tetracycline
Aqueous solutions of tetracycline were UV-irradiated in homogeneous and heterogeneous systems. Tetracycline disappeared in both systems, but the presence of TiO2 accelerated the photodegradation of the antibiotic in comparison with direct photolysis. The rate of decomposition was dependent on the concentration of tetracycline and its degradation on the surface of TiO2 can be described by means of a pseudo-first order kinetics. Photolysis involved only the photodeamination of tetracycline and a partial mineralization. Unlikely, the treatment with TiO2 and UV-light resulted in a complete mineralization of the antibiotic drug.