Page - 85 - in Advanced Chemical Kinetics

converted in tomore stable, harmless inorganic species such as carbon dioxide, water and mineral salts. AOPs are categorized as ozonation (O3), H2O2, O3/H2O2/photocatalysis, and O3/H2O2/UV photocatalysis [39, 40]. TiO2 photocatalysis is considered as more auspicious andefficient techniqueamongsemiconductorphotocatalysis [41, 42].TiO2photoactivemate- rialhas shownagreatpotential inmanyapplications, includingwater splitting togenerateO2 andH2 [43, 44]water andwastewater treatment [45, 46], gasphase treatment [47, 48], aswell as in solar cells [49]. So, in this case the degradation of BZFwas performed byVUVphoto activematerialwithexposed {001} facetedTiO2/Timaterial. Formeasurement of absolute bimolecular rate constant of•OHwithBZF,para-chlorobenzoic acid (p-CBA) was used as probe molecule was calculated using para-chlorobenzoic acid (p-CBA) as probemolecule and by employing competition kinetics technique established by Pereiraetal. [50]andgiven inEq. (15). k•OH sð Þ ¼ ks UV=H2O2ð Þ�ks UVð Þ kref UV=H2O2ð Þ�kref �k•OH refð Þ (17) Where, k•OH,kUV=H2O2ð Þ andk(UV) represent thesecondorder rate constantofhydroxyl radical, UV/H2O2, fluence based rate constant of UV/hydrogen peroxide process and UV, fluence based rate constant of direct photolysis, respectively. The notations “s” and “ref” represents thesubstrateandreferencecompounds,which inourcase isBZFandp-CBA, respectively.For thedeterminationof•OHrate constantwithBZF, twosetsof experimentswereperformed. In onesetofexperiments, thesolutioncontaining27.63μMofBZF,27.63μMofp-CBAand1mM Figure 2. Determination of bimolecular rate constant of BZFwith •OH; inset shows the degradation kinetics of BZF alone,p-CBAalone,BZF+H2O2,pCBA+H2O2exposed toUV-irradiation. Competition Kinetics: An Experimental Approach http://dx.doi.org/10.5772/intechopen.70483 85