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Table 3 Experimental independent variables and their coded levels for the central composite design

From: Biosynthesis, characterization and optimization of TiO2 nanoparticles by novel marine halophilic Halomonas sp. RAM2: application of natural dye-sensitized solar cells

Name

Code

Levels of coded variables

 

− α

− 1

0

 + 1

 + α

TiO2 concentration (M)

A

0.005

0.0141214

0.0275

0.0408786

0.05

pH

B

5

5.8

7

8.2

9

Reaction duration (min)

C

60

72

90

107

120