Table 1 Coded independent variables (factors) along with their ranges and levels for RSM optimization using CCD.optimization through CCD.

From: Response surface methodology for the design of malachite green dye removal by γ-Fe2O3 dispersed on reduced graphene oxide sheets

Coded Independent variables

Name

Units

-α(2)

-1

0

+ 1

+α(2)

A: Dose

mg/100 mL

50

100

150

200

250

B: MG dye concentration

ppm

20

40

60

80

100

C: pH

-

2

4

6

8

10

D: Contact time

min.

30

60

90

120

150

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