Role of oxygen-containing functional surface groups of activated carbons on the elimination of 2-hydroxybenzothiazole from waters in A hybrid heterogeneous ozonation system
-
Héctor Valdés
,
Manuel Sánchez-Polo
Abstract
The influence of the variation of chemical surface properties of activated carbons on the sorption capacity of activated carbons used in hybrid heterogeneous ozonation systems is still under discussion. In this study, the effect of long exposure of activated carbon to ozone and its implication on the removal of emerging organic pollutants from waters is evaluated. A commercial activated carbon (Filtrasorb-400) is used here as a raw material. It is chemically modified by continuous ozone exposure. 2-hydroxybenzothiazole (OHBT) is chosen as a target organic contaminant, representative of emerging micro-pollutants. Results obtained here reveal that extensive exposition of activated carbon surface to ozone weakens adsorbate–adsorbent interactions. Highly exposed activated carbon to ozone increases the concentration of oxygen-containing acidic functional groups, leading to a higher concentration of surface electron-withdrawing groups such as carboxylic acid anhydrides and carboxylic acids and reducing the sorption capacity toward OHBT in the hybrid heterogeneous ozonation system. At pH conditions around the point of zero charge (pHPZC), such sorption reduction could be due to a decrease on dispersive interactions among π-electrons of aromatic ring of OHBT molecules and the π-electron system of carbon graphene layers, coming after extensive exposition of activated carbon surface to ozone. However, at pH >pHPZC low removal of OHBT is obtained because of the appearing of repulsive electrostatic interactions among the ionised form of OHBT molecules and the de-protonated form of oxygen-containing functional groups that appears after long contact with ozone. In addition, a new concept to predict activated carbon performances in a hybrid heterogeneous ozonation process is proposed.
Funding statement: This research was financially supported by Comisión Nacional de Investigación Científica y Tecnológica (CONICYT) of Chile, Fondo Nacional de Desarrollo Científico y Tecnológico of Chile (FONDECYT) with the Project (CONICTY/FONDECYT Grant N° 1060304) to whom the authors are indebted.
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Artikel in diesem Heft
- Editorial: The importance of advanced oxidation processes in degrading persistent pollutants
- An overview on heterogeneous Fenton and photoFenton reactions using zerovalent iron materials
- Photooxidative Degradation of Pesticides in Water; Response Surface Modeling Approach
- The treatment of aniline in aqueous solutions by gamma irradiation
- Microwave regeneration of biological activated carbon
- Molecular iodine/aqueous NH4OAc: a green reaction system for direct oxidative synthesis of nitriles from amines
- Catalytic Degradation of Safranin T in Aqueous Medium Using Non-conventional Processes
- Oxidation of 1, 2-dichlorobenzene on a commercial V2O5-WO3/nano-TiO2 catalyst: Effect of HCl addition
- Current conduction mechanisms in thermal nitride and dry gate oxide grown on 4H-silicon carbide (SiC)
- Effect of light and oxygen on repetitive bacterial inactivation on uniform, adhesive, robust and stable Cu-polyester surfaces
- Wet oxidation of an industrial high concentration pharmaceutical wastewater using hydrogen peroxide as an oxidant
- Oxidation characteristics of heavy crude oil in ignition process
- Comparative studies on the performance of porous Ti/Sno2-Sb2O3/Pbo2 enhanced by CNT and Bi Co-doped electrodes for methyl orange oxidation
- Application of photocatalytic paint for destruction of benzo[a]pyrene. Impact of air humidity
- Spray-drying synthesis and characterization of Li4Ti5O12 anode material for lithium ion batteries
- Kinetics analysis of photocatalytic degradation of Acid Orange 7 by Co/N/Er3+: Y3Al5O12/TiO2 films
- Reaction characteristics of oxygen generation from plate-like potassium superoxide within a confined space
- Electrochemical reduction of CO2 on a Cu2O/polyaniline /stainless steel based electrode
- Role of oxygen-containing functional surface groups of activated carbons on the elimination of 2-hydroxybenzothiazole from waters in A hybrid heterogeneous ozonation system
- The degradation efficiency and mechanism of meclofenamic acid in aqueous solution by UV irradiation
- Effect of electrode oxide film in micro arc oxidation on water treatment
- Photocurrent response and photocatalytic activity of Nd-doped TiO2 thin films prepared by sol-gel method
- Mathematical model involving chemical reaction and mass transfer for the ozonation of dimethyl phthalate in water in a bubble column reactor
- Elimination of organic micro-contaminants in municipal wastewater by a combined immobilized biomass reactor and solar photo-Fenton tertiary treatment
- Degradation of catechol on BiOCl: charge transfer complex formation and photoactivity
- Photocatalytic degradation of phenol on strontium titanate supported on HZSM-5
- Selective Fenton-like catalytic oxidation of acid orange II on inorganic heterogeneous molecular imprinted catalysts
- Decoloration of azo dye methyl orange by a novel electro-Fenton internal circulation batch reactor
