Research Article

Solar Photocatalytic Degradation of Azo Dye in Aqueous Suspension Assisted by Fresnel Lens

Table 4

Effect of Fresnel lens on the degradation rate constant of AO10 wastewater.

Solar photocatalytic process* a , h−1 b , h−1 , W/m2 cΔT, °C

Without fresnel lens0.7920.60639.9–44.8 (June)
0.4380.28923.9–26.9 (Dec.)

With fresnel lens2.3071.47796.8–112.1 (June)
1.7990.86648.5–53.8 (Dec.)

*Operation condition: pH0: 6.0, [ ]0 = 1.0 g/L; reaction time: 2 h;
a : pseudo-first order rate constant based on the degradation of COD in solution;
b : pseudo-first order rate constant based on the degradation of TOC in solution;
cΔT: final solution temperature—initial solution temperature.