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Table 1 Adsorption factors with their levels under full factorial design

From: Optimization of Cr (VI) removal from aqueous solution with activated carbon derived from Eichhornia crassipes under response surface methodology

Factors

Levels

Low (−)

Middle (0)

High ( +)

pH

4

5

6

Adsorbent dose (g)

1

2

3

Initial concentration (mg/L)

0.5

2.25

4

Contact time (min)

60

90

120

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BMC Chemistry

ISSN: 2661-801X

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