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Furthermore, as shown in Figure 8, the straight line represented by a plot of ln (C0/Ct) as a function of t indicates that the HA degradation kinetics follow approximately a pseudo first order model. Indeed, the degradation of HA by metal oxide photocatalysts typically follows pseudo first order kinetics. It was reported that the degradation of HA by Ag-doped ZnO under UVA light followed a pseudo first order model with excellent correlation coefficient values (Ghaneian et al. 2014). Under solar light with TiO2, the HA degradation kinetics also followed approximately a pseudo first order model, which can be described by the Langmuir–Hinshelwood model reasonably well (He 2013). As seen in Table 3, based on kapp obtained, at lower concentrations of HA, TiO2 shows better performance.
Table 3

Parameters of pseudo first order kinetics of HA degradation by TiO2 at various initial HA concentrations

Initial HA concentrationUVA
UVC
kapp (1/min)R2kapp (1/min)R2
0.052 0.812 0.074 0.768 
0.030 0.899 0.038 0.833 
11 0.022 0.806 0.037 0.968 
14 0.016 0.915 0.027 0.959 
Initial HA concentrationUVA
UVC
kapp (1/min)R2kapp (1/min)R2
0.052 0.812 0.074 0.768 
0.030 0.899 0.038 0.833 
11 0.022 0.806 0.037 0.968 
14 0.016 0.915 0.027 0.959 
Figure 8

Pseudo first order kinetics of HA degradation by TiO2 at various initial HA concentration under UVA (a) and UVC (b) light (catalyst dose = 0.3 g/L, UVA light intensity = 0.131 mW/cm2, UVC light intensity = 0.196 mW/cm2).

Figure 8

Pseudo first order kinetics of HA degradation by TiO2 at various initial HA concentration under UVA (a) and UVC (b) light (catalyst dose = 0.3 g/L, UVA light intensity = 0.131 mW/cm2, UVC light intensity = 0.196 mW/cm2).

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