Use of ozone/activated carbon coupling to remove diethyl phthalate from water: Influence of activated carbon textural and chemical properties

This report presents a comprehensive study of the degradation kinetics of herbicide 2,4-D using ozone with and without intensification with UVC radiation. The by-products cause several seriesparallel reactions that compete with the process of photon absorption when radiation is applied.Five processes were analyzed separately: (i) the direct photolysis of 2,4-D and its main byproducts, (ii) direct ozonation in the absence of hydroxyl radicals using tert-butanol as radical scavenger, (iii) the oxidation when ozone reacts in parallel with hydroxyl radicals, (iv) the reaction enhanced with UVC radiation and (v) the oxidation improved by pH modifications.A kinetic model was developed based on the main reaction by-products. The corresponding parameters of the reacting system were determined (9 of its 29 kinetic constants were previously unknown).Simulation results, including a rigorous description of the reacting system and the radiation field (having dark and illuminated volumes) agree very well with the experimental data.

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“…The contribution of radical oxidation reactions to the overall 2,4-D degradation rate can be expressed as follows 53 : …”

Section: Reaction Scheme and Interpretation Of The Resultsmentioning

confidence: 99%

Reaction Kinetic Model for 2,4-Dichlorophenoxyacetic Acid Decomposition in Aqueous Media Including Direct Photolysis, Direct Ozonation, Ultraviolet C, and pH Enhancement

Gilliard

Martín

Cassano

et al. 2013

Ind. Eng. Chem. Res.

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“…Activated carbons have been extensively used as common catalysts due to their high surface area, chemical resistance and adsorption capacity coupled with reasonable cost. It can promote the decomposition of aqueous ozone to generate more hydroxyl radicals ( • OH), thus enhancing the degradation of refractory pollutants [5]. However, their activities and stabilities should be improved further.…”

Section: Introductionmentioning

confidence: 99%

Activated carbon and cerium supported on activated carbon applied to the catalytic ozonation of polycyclic aromatic hydrocarbons

Liu

Deng

Shi

2012

Journal of Molecular Catalysis A: Chemical

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“…However, these processes are either inefficient or too expensive. Thus, an increasing interest has been given to the combining of processes such as photocatalysis and electrooxidation (8), adsorption and ozonation (9), or electrooxidation and electrocoagulation (10,11). Electrocoagulation (EC) is known as a complex process characterized by a variety of mechanisms that operate synergistically in order to remove pollutants from water (12)(13)(14)(15)(16)(17).…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Optimization of Indigo Carmine Removal by an Electrocoagulation/GAC Coupling Process in a Batch Reactor

Secula

Stan

Cojocaru³

et al. 2014

Separation Science and Technology

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A coupling process between Electrocoagulation (EC) and GAC was employed to separate dyes from aqueous solutions. The removal of an indigoid dye, namely C.I. Acid Blue 74, was tested. A novel approach for optimizing EC-based techniques is presented. In addition to maximizing removal efficiency, minimizing consumptions of energy and electrode materials were also targeted by means of multi-objective optimization in order to reduce the specific costs. A very good cost-efficiency feature of EC/GAC coupling process operated under optimal conditions to treat wastewater from dyestuff has been revealed. The independent variables considered were the current density, influent pH, contact time, granular activated carbon dose, and initial dye concentration. Simple maximization of color removal efficiency and multi-objective optimization were compared. Two different constraints were considered for each type of optimization. The determined costs outline the cheapness feature of the EC/GAC system as a potential dye wastewater treatment technology.

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Use of ozone/activated carbon coupling to remove diethyl phthalate from water: Influence of activated carbon textural and chemical properties

Cited by 73 publications

References 27 publications

Reaction Kinetic Model for 2,4-Dichlorophenoxyacetic Acid Decomposition in Aqueous Media Including Direct Photolysis, Direct Ozonation, Ultraviolet C, and pH Enhancement

Reaction Kinetic Model for 2,4-Dichlorophenoxyacetic Acid Decomposition in Aqueous Media Including Direct Photolysis, Direct Ozonation, Ultraviolet C, and pH Enhancement

Activated carbon and cerium supported on activated carbon applied to the catalytic ozonation of polycyclic aromatic hydrocarbons

Multi-Objective Optimization of Indigo Carmine Removal by an Electrocoagulation/GAC Coupling Process in a Batch Reactor

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