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Table 2 Independent variables and their levels employed in the central composite design

From: Semi-empirical study of ortho-cresol photo degradation in manganese-doped zinc oxide nanoparticles suspensions

Variables

Units

Level of variables

Low

High

X1

Irradiation time

minute

120

360

X 2

pH

-

6.6

9.8

X3

Photo catalyst amount

g/L

0.5

2.5

X4

Concentration of o-cresol

mg/L

15

55

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BMC Chemistry

ISSN: 2661-801X

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