Glycerol Transformation Through Photocatalysis: A Possible Route to Value Added Chemicals
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Valter Maurino
Abstract
The photocatalytic process is a possible way for obtaining value-added chemicals from glycerol (Gly). The kinetic and mechanism of transformation of glycerol are explored as a function of several operating parameters (type of the catalyst, pH, substrate concentration, fluorination of the catalyst surface). Different transformation rates are observed for glycerol on pristine P25 and Merck powders. By use of Degussa P25, the phototransformation rate shows a sharp maximum at low glycerol concentration, thus deviating from Langmuir-Hinshelwood behavior. These results are qualitatively rationalized with a kinetic model that includes substrate mediated carrier recombination (back reaction) and invokes two reactive sites on P25 TiO2. At relatively high concentration of substrate, 1,3-dihydroxyacetone (DHA) and glyceraldehyde (GAD) accumulate in the irradiated suspensions. Fluorination of the catalyst surface shows the most relevant influence on P25, leading to a decrease in the Gly disappearance rate at low substrate concentration, but a fivefold increase in the high concentration regime, suppressing the maximum in the phototransformation rate observed on pristine P25. Fluorides block the strong adsorbing active sites of P25, responsible of the high activity at low substrate concentration, and of the decrease of activity at high substrate concentration due to a relevant increase in back reactions. For both fluorinated catalysts the production of DHA and GAD is enhanced. The results make clear the peculiarities of P25, and demonstrate that the back reactions have a crucial role in photocatalysis. The tuning of the catalyst’s surface properties greatly influences the selectivity of the process.
© 2016 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Glycerol Transformation Through Photocatalysis: A Possible Route to Value Added Chemicals
- Photocatalytic Degradation of Methylene Blue on Fixed Powder Layers: Which Limitations are to be Considered?
- Surface Modification of TiO2 with Ascorbic Acid for Heterogeneous Photocatalysis: Theory and Experiment
- Vacuum-UV- (VUV-) Photochemically Initiated Oxidation of Dimethylamine in the Gas Phase
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- Photochromic and Photocatalytic Inorganic-Organic Multilayer Films based on Polyoxometalates and Poly(ethylenimine)
- Biodegradation of Photo-Fenton Pre-Treated Solutions of Sulfamethoxazole by Aerobic Communities. Molecular Biology Techniques Applied to the Determination of Existing Strains
- Oxidation of Pesticides in Water by Fenton and Photo-Fenton Reactions
- Physicochemical Treatment of Three Chemotherapy Drugs: Irinotecan, Tamoxifen, and Cyclophosphamide
- Comparison of Photo-Fenton Treatment and Coupled Photo-Fenton and Biological Treatment for Detoxification of Pharmaceutical Industry Contaminants
- Integration of Environmental and Economic Performance of Processes. Case Study on Advanced Oxidation Processes for Wastewater Treatment
- Remediation of Water Contaminated with Pesticides by Indirect Electrochemical Oxidation Process Electro-Fenton
- Adsorption and Photocatalytic Degradation of Phthalic Acid on TiO2 and ZnO
- Treatment of Phenol, Formaldehyde and their Mixtures by Photocatalytic and Biological Methods
- Photoelectrocatalytic Activity of Electrosynthesised Tungsten Trioxide- Titanium Dioxide Bi-Layer Coatings for the Photooxidation of Organics
- Heterogeneous Photocatalytic Degradation of Acid Dyes in Aqueous TiO2 Suspensions: Kinetics and Toxicity
- Neural Networks and Genetic Algorithms Optimization of the Photocatalytic Degradation of Alcian Blue 8GX
- Super-Hydrophilic and Photocatalytic Properties of Ag-TiO2 Thin Films Prepared by Sol–Gel Technique
- Aerobic Bio-oxidation with Ozonation for Recalcitrant Wastewater Treatment
- Photochemical Reactivity of Iron(III)-Doped Ruthenium(II)-tris- Bipyridine/Titanium Dioxide Zeolite Y Photocatalysts at High Substrate Concentrations
- Effect of Contaminant Hydrophobicity in the Treatment of Contaminated Soils by Catalyzed H2O2 Propagations (Modified Fenton’s Reagent)
- Preparation of Photocatalytic Coatings Adapted to the Elimination of Airborne Pollutants: Influence of the Substrate on the Degradation Efficiency
- Ozonation of Landfill Leachates: Treatment Optimization by Factorial Design
- Ozone Transfer and Decomposition of Isopropyl Alcohol by H2O2/Ozone Process in a Rotating Packed Contactor
- Photocatalytic Destruction of Geosmin Using Novel Pelleted Titanium Dioxide
- Re-Utilization of Exhaustion Baths in Cotton-Dyeing Processes After Solar-Based Photo-Oxidative Treatments
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