Table 6: Equivalent value related to the cost of 3 h of ZnO photoirradiated reaction.

Equipment and reagentsQuantity used (3 h)*Cost for the process (3 h) (US$)*

Pump energy consumption (kW-h)0.02870.008323***
Reagents
H2SO4 + NaOH (g)
0.020.0008105**

Total cost:0.0164

*US$ 1,00 = R$ 1.71; Cotações UOL.
**Quote N° 212712 from Labsynth Produtos of Laboratórios Ltda.
***1 kW-h = US$ 0.29; the third most expensive electricity in Brazil—Portal Business Brasil.