Table 3 Thermodynamic parameters for Metformin adsorption on GO, CTOS-mGO and PFPA-rGO (Initial Metformin concentration = 20 mg/l, pH = 6, contact time = 120 min, adsorbent dosage = 5 mg, and temperature = 283, 293, 303 and 313 K).

From: Preparation of graphene based composites using silane and Pyracantha fortuneana and their application in Metformin adsorption from aqueous solution

Material

Temperature (K)

ln KT

ΔG0 (kJ/mol)

ΔH0 (kJ/mol)

ΔS0 (kJ/mol)

GO

283

0.957

− 2.254

− 5.948

− 4.149

293

1.104

− 2.692

  

303

0.977

− 2.462

  

313

0.805

− 2.096

  

CTOS-mGO

283

1.260

− 2.966

− 2.593

2.520

293

1.528

− 3.725

  

303

1.463

− 3.687

  

313

1.151

− 2.998

  

PFPA-rGO

283

0.834

− 1.963

− 1.193

3.117

293

0.893

− 2.177

  

303

0.942

− 2.376

  

313

0.758

− 1.973

  
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