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The Application of Zeolites in Ozonation Processes for the Enhanced Removal of Organic Pollutants from Aqueous Solutions, pp. 361-373 $100.00
Authors:  (Yi-Hung Chen, Neng-Chou Shang - Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan and others)
Abstract:
Conventional ozonation treatment is inefficient and restricted to the oxidation of
refractory pollutants. Recently, the application of zeolites in ozonation processes encompasses
adsorption and catalysis mechanisms that increase and accelerate the removal of pollutants
from aqueous solutions. In adsorptive ozonation, ozone molecules and hydrophobic pollutants
such as trichloroethylene or 2-methylisoborneol are simultaneously adsorbed in the pores of
high-silica zeolites, significantly increasing their elimination rates. On the other hand, lowsilica
zeolites acting as heterogeneous catalysts can chemically modify ozone molecules into
new reactive oxygen species such as hydroxyl radicals, resulting in the vigorous oxidation of
pollutants. This is termed catalytic ozonation. Catalytic ozonation can overcome the
limitations of the conventional ozonation process, and is significantly effective in destroying
refractory pollutants. In addition, adsorption of pollutants on hydrophilic zeolites may
increase during ozonation due to the smaller molecular size and higher polarity of the
ozonation products. Obviously, the chemical composition of the zeolites and the
hydrophobicity of the pollutant strongly affect the adsorptive and catalytic circumstances
during ozonation processes. This article can provide useful information about the choice and
utilization of the zeolites to achieve the remarkable enhancement of ozonation efficiency. 


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The Application of Zeolites in Ozonation Processes for the Enhanced Removal of Organic Pollutants from Aqueous Solutions, pp. 361-373