Res. Chem. Intermed.
, Vol. 27, No. 4,5, pp. 343–358 (2001)
Comparison of radiation and photoinduced degradation of
pollutants in water: synergistic effect of O
A Short Review
Ludwig Boltzmann Institute for Radiation Chemistry and Radiation Biology,
c/ o The University of Vienna A-1090 Wien, Althanstraße 14, UZA II, Ebene 5, Austria
Abstract—The radiation- and photoinduced degradation of water pollutants such as trichloroethylene
(TCE), ethylenediaminotetraacetic acid (EDTA) and 4-chlorobenzaldehyde(4-ClBA) in the absence
and presence of O
and/ or TiO
were reviewed and compared. The application of sunlight as
energy source for photocatalytic processes is brie y mentioned. The electron beam treatment of large
quantities of water seems to be the most economic method.
As a consequence of the increase in world population, and the expansion of various
industries and the application of fertilizers and pesticides in modern agriculture,
water resources have become heavily polluted. The same is true for air and soil.
Hence, new measures are needed in order to reduce the emission of pollutants and
to preserve the environment for the next generation.
A crucial problem is the achievement of an ef cient puri cation and sterilization
of water for drinking purposes. There are several methods for degradation of water
pollutants reported in the literature (e.g. Refs. [1– 12]). The most important are
compiled in Scheme 1. Their ef ciency and applicability depends on the chemical
nature and concentration of the pollutants.
In most cases, ozonation treatment or electron beam processing or a combination
of both can lead to acceptable results in water puri cation. The synergistic effect
of catalysts (e.g. TiO
) can contribute essentially in this respect. For puri cation of
small quantities of water, the ionizing radiation can be replaced by UV-light or even
by solar energy.