Author details

adsorption of MB from the dye mixture is clear for the same reason of surface charge as discussed before. After adsorption and subjecting the dye solutions to illumination of simulated light, the degradation of MB was started (Figure 9b). According to postulates of any photocatalytic process, the catalyst will initially adsorb the reactant, catalyze the reaction, and finally leave the products. By the same concept, the adsorbed dye was degraded, while dyes in

Figure 8. Absorption spectra of MB dye (1 <sup>10</sup><sup>4</sup> M) in presence of (a) Co-doped TNT 1 calcined at 500C for 2 h and (b)

Co-doped TNT 1 at Au in dark and under illumination [13] (copyright 2018, Elsevier).

the solution remained without effect [13].

32 Photocatalysts - Applications and Attributes

Ayman Hassan Zaki\* and Waleed Mohamed Ali. El Rouby

\*Address all correspondence to: ayman\_h\_zaki@yahoo.com

Materials Science and Nanotechnology Department, Faculty of Postgraduate Studies for Advanced Sciences (PSAS), Beni-Suef University, Beni-Suef, Egypt
