Solar Photocatalytic Degradation of Azo Dye in Aqueous TiO_𝟐 Suspension Assisted by Fresnel Lens

Table 3

Polynomial regression equation of AO10 degradation on the basis of COD and TOC removal.

Polynomial regression equation	𝑟^2
^a𝑌COD= 81.0 + 𝑋1 + 9.7𝑋2 + 15.3𝑋3 – 3.9 𝑋1^2– 0.2 𝑋2^2 – 4.6 𝑋3^2 – 5𝑋1𝑋2 – 6.9𝑋1𝑋3 – 8.3𝑋2𝑋3	0.971
^a𝑌TOC= 74.1 − 5𝑋1 + 10.5𝑋2 + 18.7𝑋3 – 3.2𝑋1^2 – 2 𝑋2^2 – 5.7 𝑋3^2 – 2.6𝑋1𝑋2 – 3.7𝑋1𝑋3 – 1.3𝑋2𝑋3	0.997

^a𝑌_COD: the COD degradation efficiency of AO10 wastewater.
^b𝑌_TOC: the TOC degradation efficiency of AO10 wastewater.