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. 2023 Aug 30;9(9):e19551. doi: 10.1016/j.heliyon.2023.e19551

Table 1.

Factors together with theis notations and levels for the central composite design.

Factor names -α* −1 0 +1 +αa
A Interaction time (min) 0.3 3 9.5 16 18.7
B CQD/En ratio (%) 1.5 4 10 16 18.5
C CQD Type Pure S-doped P-doped
a

α = 0.2.