Table 9 The isotherm constants of AA on the M-KOH-RH.

From: Improving adsorption performance of l-ascorbic acid from aqueous solution using magnetic rice husk as an adsorbent: experimental and RSM modeling

Model

Parameter

Temperature (°C)

15

25

35

Langmuir

qm,cal (mg/g)

19.157

31.34

38.75

KL (L/mg)

0.0396

0.0797

0.6218

R2

0.9982

0.9996

0.9985

Freundlich

RL

0.0498

0.0254

0.0033

KF (mg/g)

9.754

13.295

24.4005

n

9.727

6.622

10.384

R2

0.815

0.9168

0.8966

Temkin

β (J/mol)

1.7377

3.8101

3.4455

AT (L/g)

81.247

11.658

623.0956

R2

0.8229

0.9379

0.908

D-R

qD (mg/g)

18.25

29.07

38.67

K (mol2/J2)

0.0004

0.00005

0.00002

E (kJ/mol)

0.0353

0.1000

0.1580

R2

0.9001

0.9516

0.9959

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