Nanotechnostructured Catalysts TiO Nanoparticles for Water Purification - Nanotechnologies for Water Environment Applications - page 61

Figure 3.9 Schematic representation of a CPC reactor (Redrawn from Blanco et al.,
1999).
Several features of the solar CPC system can be recognized: (a) simple and cost-
effective; (b) allowing continuous operation with high efficiency; (c) full automation
with minimum maintenance; (d) maximizing usage of solar irradiation with small
construction space; (e) easy to be scale-up by additional reaction tubes; (f) flexible
component design, which can be combined with other advanced oxidation processes
AOPs processes, such as Fenton, H 2 O 2 or ozone; (g) centralized control allowing
addition and testing of diverse treatment variables; and (f) high modification potentials
(other reactor designs, e.g., thin film or fixed bed, can be integrated into the CPC
system).
3.4.1.3 Fixed Bed Reaction System
An alternative to suspended catalysts is the fixed bed reactors, which immobilize
TiO 2 on various media and support materials, including glass (Doong et al., 2001; Chan
et al., 2003; Noorjahan et al., 2003; Xie et al., 2003; Tang et al., 2004; Zhang et al., 2004;
Cernigoj et al., 2007; Xu et al., 2007), optical fiber (Danion et al., 2004; Lin et al., 2007;
Van Gerven et al., 2007), ceramic and polymer membrane/matrix ( Hoffmann et al.,
1995; Malati, 1995; Pozzo et al., 1997; Arabatzis et al., 2005; Teekateerawej et al., 2006;