Solar driven advanced oxidation processes for water decontamination and disinfection - Solar Energy Sciences and Engineering Applications - page 399

Figure 13.3.1 The solar spectrum.
process (300-500 nm) may be provided by solar radiation since it has been widely
reported that the sun is an important light source for driving photo-Fenton process in
the wavelength above 300 nm as shown in Figure 13.3.1.
13.3.1 Degradation of organic pollutants by solar driven
photo-Fenton processes
Several different types of organic pollutants have been tested for the application of
solar driven photo-Fenton processes including dyes and textile wastewater effluents,
surfactants and algal toxins, among many others.
The following are some of the most widely reported organic pollutants tested for
solar driven photo assisted Fenton and Fenton-like processes.
13.3.1.1 Pesticide degradation
Solar driven photo assisted Fenton (SDPAF) and Fenton-like processes have been
tested for pesticide degradation. Recently, Quiroz et al., (2011) published a complete
review on the application of advanced oxidation processes for pesticide removal in
aqueous media, including interesting tabulated data on references related with Fen-
ton and Fenton-like processes. Specifically, triazinic pesticides have been successfully
removed from water by using solar driven Fenton-like processes (Bandala et al., 2007;
Perez et al., 2006) as well as dimethylurea pesticides (Farre et al., 2007; Perez et al.,
2006); organophosphorous (Farre et al., 2007; Hincapié et al., 2005); chloracetic
acid (Bandala et al., 2007a); and phenol and phenolic derivatives (Farre et al., 2007).
An interesting effect that should be taken into account when applying homogeneous
photocatalysis for pesticide degradation is the presence of salt counterions. Inorganic
anions (Cl − ,SO 2 4 , HPO 2 4 ) present in the water or added as reagents have a signifi-
cant effect on the reaction rates of Fenton processes such as complexation with Fe 2 +