An Integral Degradation Model to Describe H2O2-Photooxidation of Linear Alkylbenzenesulfonate (LAS) Surfactants
-
A. Menéndez
and
A. de Luis
Abstract
Synthetic surfactants are amphipathic molecules consisting of a hydrophilic polar head moiety and a hydrophobic non-polar tail one. Alkyl benzene sulfonates are the principal type of laundry anionic surfactants, they are extensively used because of its relatively low cost, good performance, and easy-processing to a stable powder with biodegradable characteristics at low concentrations. LAS are a mixture of homologues and phenyl positional isomers, each containing an aromatic ring sulfonated at position para and attached to a C10-C14 linear alkyl chain at any position except the terminal one. These surfactants are used frequently in laundry detergent formulations due to its high efficiency in detergency, wetting and dispersion processes, acting as energizers of the surface activity. LAS surfactants invade the environment mainly via discharge from sewage treatment works. In spite of the fact that the sulfonic moiety is degraded by bacterial action, the organic part, especially the ring, is firmly resistant to biological degradation. This paper reports the complete photooxidation of LAS in aqueous solution in the presence of hydrogen peroxide. Initial solutions contained 100 mg/l of surfactant LAS were oxidized at pH 3 and modifying the initial hydrogen peroxide concentration from 0 to 23.58 mM. The proposed lumped kinetic model is based on former observations and assumes the formation of intermediates lumps with different absorption behaviour. The mechanism consists in seven pseudo-first order kinetic reactions. The apparent kinetic constants are directly dependent on dosage of oxidant, and in this work, this dependence has been analysed. The model describes acceptably the evolution of the three lumps of intermediates within the operating conditions of pH and oxidant dosage analysed. Besides, changes in functional groups and aromaticity during degradation were evaluated for the samples and related to the intermediates defined in the kinetic model.
© 2016 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Preface
- An Integral Degradation Model to Describe H2O2-Photooxidation of Linear Alkylbenzenesulfonate (LAS) Surfactants
- Characterization of the Radical Oxidative Level in the Degradation of Phenolic Compounds with H2O2/UV
- Photocatalytic Decolorization of Methylene Blue with Two Photoreactors
- Determination of Quantum Yield in a Heterogeneous Photocatalytic System Using a Fitting-Parameters Model
- Evaluation of Zinc Oxide-Based Photocatalytic Degradation of a Commercial Pesticide
- Photocatalytic Activity of W-Doped TiO2 Nanopowders
- Catalytic Wet Peroxide Oxidation Process for the Continuous Treatment of Polluted Effluents on a Pilot Plant Scale
- Effect of Ultrasound on the Properties of Heterogeneous Catalysts for Sono-Fenton Oxidation Processes
- AOP in Water by Means of a DBD Conducted in a Coaxial Reactor
- Removal of Atrazine from Simulated Groundwater by AOTs
- Modelling Approach to Fenton and Photo-Fenton Treatments
- Chlorobenzene Degradation Assisted by TiO2 under UV Irradiation in Aqueous Solutions
- Optimization of Parameters for Hydrogen Production by Photocatalytic Alcohol Reforming in the Presence of Pt/TiO2 Nanocrystalline Thin Films
- Study on Bipolar Corona Discharge in Emitting Needle Electrode Configuration
- I-V Characteristics of Corona Discharge in Emitting Wire Electrode Configuration
- Micro-pore Ceramic Filter and UV System as Ballast Water Treatment: Preliminary Study on Chlorella Removal and Bacteria Inactivation
- Application of Box–Wilson Experimental Design Method for the Photocatalytic Degradation of Remazol Brilliant Blue R-A with Solar UV/TiO2/Fe(III) Processes
- Treatment of Industrial Cork Processing Water by Ozonation and Ozone Based Advanced Oxidation Processes (O3/UV and O3/H2O2) in a Bubble Column Reactor
- Chemo- and Regio-Selectivity in the TiO2-Mediated Photooxidation of 1,n-diols
- Photosensitized Chlorobenzene Degradation by UV/H2O2 Oxidation
- Influence of Solution Composition and Chemical Structure of Dye on Removal of Organic Dye by DC Diaphragm Discharge in Water solutions
- Photocatalytic Oxidation of Multi-Component Systems – An Investigation Using Toluene/Ethylbenzene, Octane/Decane/Dodecane and Formaldehyde/Acetaldehyde
Articles in the same Issue
- Preface
- An Integral Degradation Model to Describe H2O2-Photooxidation of Linear Alkylbenzenesulfonate (LAS) Surfactants
- Characterization of the Radical Oxidative Level in the Degradation of Phenolic Compounds with H2O2/UV
- Photocatalytic Decolorization of Methylene Blue with Two Photoreactors
- Determination of Quantum Yield in a Heterogeneous Photocatalytic System Using a Fitting-Parameters Model
- Evaluation of Zinc Oxide-Based Photocatalytic Degradation of a Commercial Pesticide
- Photocatalytic Activity of W-Doped TiO2 Nanopowders
- Catalytic Wet Peroxide Oxidation Process for the Continuous Treatment of Polluted Effluents on a Pilot Plant Scale
- Effect of Ultrasound on the Properties of Heterogeneous Catalysts for Sono-Fenton Oxidation Processes
- AOP in Water by Means of a DBD Conducted in a Coaxial Reactor
- Removal of Atrazine from Simulated Groundwater by AOTs
- Modelling Approach to Fenton and Photo-Fenton Treatments
- Chlorobenzene Degradation Assisted by TiO2 under UV Irradiation in Aqueous Solutions
- Optimization of Parameters for Hydrogen Production by Photocatalytic Alcohol Reforming in the Presence of Pt/TiO2 Nanocrystalline Thin Films
- Study on Bipolar Corona Discharge in Emitting Needle Electrode Configuration
- I-V Characteristics of Corona Discharge in Emitting Wire Electrode Configuration
- Micro-pore Ceramic Filter and UV System as Ballast Water Treatment: Preliminary Study on Chlorella Removal and Bacteria Inactivation
- Application of Box–Wilson Experimental Design Method for the Photocatalytic Degradation of Remazol Brilliant Blue R-A with Solar UV/TiO2/Fe(III) Processes
- Treatment of Industrial Cork Processing Water by Ozonation and Ozone Based Advanced Oxidation Processes (O3/UV and O3/H2O2) in a Bubble Column Reactor
- Chemo- and Regio-Selectivity in the TiO2-Mediated Photooxidation of 1,n-diols
- Photosensitized Chlorobenzene Degradation by UV/H2O2 Oxidation
- Influence of Solution Composition and Chemical Structure of Dye on Removal of Organic Dye by DC Diaphragm Discharge in Water solutions
- Photocatalytic Oxidation of Multi-Component Systems – An Investigation Using Toluene/Ethylbenzene, Octane/Decane/Dodecane and Formaldehyde/Acetaldehyde
