Catalytic ozone aqueous decomposition promoted by natural zeolite and volcanic sand

Chemical oxidation using ozone in the presence of appropriate catalysts offers an attractive option for removing poorly biodegradable pollutants. However, the effect of such catalysts on ozone aqueous decomposition is not well documented. This study compares experimental results on ozone aqueous dec...

Full description

Saved in:
Bibliographic Details
Published in:Journal of hazardous materials 2009-06, Vol.165 (1), p.915-922
Main Authors: Valdés, Héctor, Farfán, Víctor J., Manoli, Jorge A., Zaror, Claudio A.
Format: Article
Language:English
Subjects:
Acetic Acid
Advanced oxidation processes
Applied sciences
Catalysis
Catalytic reactions
Chemical engineering
Chemistry
Environmental Pollutants - chemistry
Environmental Restoration and Remediation - methods
Exact sciences and technology
Free Radical Scavengers
General and physical chemistry
Hydrogen-Ion Concentration
Kinetics
Oxidation-Reduction
Ozone - chemistry
Ozone self-decomposition
Pollution
Reactors
Silicon Dioxide - chemistry
Solutions
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Volcanic sand
Zeolite
Zeolites - chemistry
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Chemical oxidation using ozone in the presence of appropriate catalysts offers an attractive option for removing poorly biodegradable pollutants. However, the effect of such catalysts on ozone aqueous decomposition is not well documented. This study compares experimental results on ozone aqueous decomposition promoted by zeolite and volcanic sand. These are two low costs natural materials identified as suitable catalysts for heterogeneous ozonation. The effects of pH (2–8) and free radical scavengers (acetic acid) on the dissolved ozone decay rate are evaluated at laboratory scale. Results show that the ozone decay rate increases in the presence of natural materials tested here. Under alkaline conditions, the effect of free radical scavengers on ozone self-decomposition is significantly reduced when such materials were present, particularly in the case of volcanic sand. Results suggest that ozone aqueous decomposition in the presence of zeolite and volcanic sand take place mainly on the natural material surface. The presence of metal oxides in zeolite and volcanic sand might catalyse ozone decomposition into more active radicals, thus enhancing the oxidation of organic pollutant.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2008.10.093