Adsorption and Photodegradation of Humic Acids by Nano-Structured TiO2 for Water Treatment
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P. F. Lee
Abstract
Removal of natural organic matter (NOM) is always a concern in water treatment, particularly the formation of chlorinated organic compounds such as trihalomethane (THM) - toxic by-products resulting from the chlorination and disinfection of residual organic compound. TiO2 photocatalysis has been exhibited as a promising technology for complete mineralization of various organic matter in water treatment. In this study, the adsorption and photodegradation of humic acids (HA) by homemade nano-structured TiO2 was investigated. It was found that high HA adsorption on the homemade nano-structured TiO2 was achieved at low pH condition and increased cation strength. The adsorption isotherm of HA on TiO2 was well modeled with Langmuir and Freundlich model. The adsorption kinetics of HA on TiO2 was found to follow a two-stage process: diffusion-controlled process and attachment-controlled process. Lower pH values and increased Ca2+ concentration would enhance the adsorption kinetic of HA on TiO2. However high adsorption of HA on TiO2 did not show significant effect upon the photo-degradation rate of HA.
© 2016 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Preface (TiO2-11 Section)
- Preface (AOTs-12 Section)
- Photocatalytic Decomposition of Formaldehyde Using Titania Coated Lime Tile
- TiO2-Nitrogen Modified for Water Decolourisation under VIS Radiation
- FTIR Studies of the Surface of TiO2, Fe-TiO2 and Fe-C-TiO2 Photocatalysts in Phenol Oxidation Via the Photo-Fenton Process
- Using Titania Photocatalysts to Degrade Toluene in a Combined Adsorption and Photocatalysis Process
- Photoelectrochemical Decomposition of VOCs on an Anodized TiO2 Plate
- Enhancement and Modeling of the Photocatalytic Degradation of Benzoic Acid
- Reactivity Indices for ortho/para Monosubstituted Phenols
- Modeling of the Photocatalytic Degradation Reactions of Aromatic Pollutants: A Solvent Effect Model
- Photodegradation of Malachite Green Using Immobilized TiO2 and Factorial Design
- Adsorption and Photodegradation of Humic Acids by Nano-Structured TiO2 for Water Treatment
- Photocatalytic Reductive Destruction of Azo Dyes by Polyoxometalates
- Effect of the Sintering Temperature on the Photocatalytic Activity of CdO + CdTiO3 Thin Films
- Photocatalytic Activity in Zn2TiO4 + ZnO Thin Films Obtained by the Sol-gel Process
- TiO2-Based Materials for Toluene Photocalytic Oxidation: Water Vapor Influence
- Influence of Aqueous Solubility of Various VOCs on Their Photocatalytic Degradation
- Photocatalysis: A Powerful Technology for Cold Storage Applications
- Some Remarks on So-Called Heterogeneous Photocatalysis and on the Mechanical Application of the Langmuir-Hinshelwood Kinetic Model
Articles in the same Issue
- Preface (TiO2-11 Section)
- Preface (AOTs-12 Section)
- Photocatalytic Decomposition of Formaldehyde Using Titania Coated Lime Tile
- TiO2-Nitrogen Modified for Water Decolourisation under VIS Radiation
- FTIR Studies of the Surface of TiO2, Fe-TiO2 and Fe-C-TiO2 Photocatalysts in Phenol Oxidation Via the Photo-Fenton Process
- Using Titania Photocatalysts to Degrade Toluene in a Combined Adsorption and Photocatalysis Process
- Photoelectrochemical Decomposition of VOCs on an Anodized TiO2 Plate
- Enhancement and Modeling of the Photocatalytic Degradation of Benzoic Acid
- Reactivity Indices for ortho/para Monosubstituted Phenols
- Modeling of the Photocatalytic Degradation Reactions of Aromatic Pollutants: A Solvent Effect Model
- Photodegradation of Malachite Green Using Immobilized TiO2 and Factorial Design
- Adsorption and Photodegradation of Humic Acids by Nano-Structured TiO2 for Water Treatment
- Photocatalytic Reductive Destruction of Azo Dyes by Polyoxometalates
- Effect of the Sintering Temperature on the Photocatalytic Activity of CdO + CdTiO3 Thin Films
- Photocatalytic Activity in Zn2TiO4 + ZnO Thin Films Obtained by the Sol-gel Process
- TiO2-Based Materials for Toluene Photocalytic Oxidation: Water Vapor Influence
- Influence of Aqueous Solubility of Various VOCs on Their Photocatalytic Degradation
- Photocatalysis: A Powerful Technology for Cold Storage Applications
- Some Remarks on So-Called Heterogeneous Photocatalysis and on the Mechanical Application of the Langmuir-Hinshelwood Kinetic Model
