Adsorptive removal of chromium (VI) ions from solution using P-doped nanostructured carbon materials: Modelling of the adsorption isotherms, Thermodynamics and Kinetic investigation
Sadek, O., Khalil, K., Mahmoud, H., hamed, M. (2025). Adsorptive removal of chromium (VI) ions from solution using P-doped nanostructured carbon materials: Modelling of the adsorption isotherms, Thermodynamics and Kinetic investigation. EKB Journal Management System, 10(3), 423-429. doi: 10.21608/sjsci.2025.409045.1301
Omar Allam Sadek; Kamal M. S. Khalil; Hatem Ahmed Mahmoud; mervat asaad hamed. "Adsorptive removal of chromium (VI) ions from solution using P-doped nanostructured carbon materials: Modelling of the adsorption isotherms, Thermodynamics and Kinetic investigation". EKB Journal Management System, 10, 3, 2025, 423-429. doi: 10.21608/sjsci.2025.409045.1301
Sadek, O., Khalil, K., Mahmoud, H., hamed, M. (2025). 'Adsorptive removal of chromium (VI) ions from solution using P-doped nanostructured carbon materials: Modelling of the adsorption isotherms, Thermodynamics and Kinetic investigation', EKB Journal Management System, 10(3), pp. 423-429. doi: 10.21608/sjsci.2025.409045.1301
Sadek, O., Khalil, K., Mahmoud, H., hamed, M. Adsorptive removal of chromium (VI) ions from solution using P-doped nanostructured carbon materials: Modelling of the adsorption isotherms, Thermodynamics and Kinetic investigation. EKB Journal Management System, 2025; 10(3): 423-429. doi: 10.21608/sjsci.2025.409045.1301

Adsorptive removal of chromium (VI) ions from solution using P-doped nanostructured carbon materials: Modelling of the adsorption isotherms, Thermodynamics and Kinetic investigation

Sohag Journal of Sciences
Volume 10, Issue 3, September 2025, Pages 423-429    PDF (735.81 K)
Document Type: Regular Articles
DOI: 10.21608/sjsci.2025.409045.1301
Authors
Omar Allam Sadek* 1; Kamal M. S. Khalil2; Hatem Ahmed Mahmoud2; mervat asaad hamed3
1assistant researcher at Agricultural Research Center
2Chemistry Department, Faculty of Science, Sohag University
3Senior Researcher at Environment Department Soils, Water and Environment Research Institute Agricultural Research Centre
Abstract
A series of nanostructured phosphorous P-doped porous carbons synthesized from sorghum stalks biomass were investigated for Cr (VI) adsorptive removal. The adsorbent materials, which were activated at 400, 600 and 800 °C, are characterized by ultra-high surface area (SBET), mesoporous surface area (Smeso) and graphene-like structure with slit shaped porosity. The adsorbents showed adsorption capacity, (qads) in the order of SCP600 > SCP800 > SCP400, which was the same order for total pore volume (VT), and pore width (PW). The most active adsorbent, SCP600, showed qads of 120.1 mg/g at pH of 2. Modeling of the adsorption isotherms were investigated by a group of related isotherms, which showed the best fit with the Langmuir isotherm model. Kinetic of the adsorption process was investigated via three kinetic models and showed to follow the pseudo-second order model. Thermodynamic studies at different initial Cr (VI) concentrations resulted in negative ΔH°, ΔS°, and ΔG° values. Thus, indicating physicochemical and spontaneous adsorption. The present investigation emphasizes that qads, of P-doped porous carbon materials derived from sorghum stalks towards Cr (VI) is related not only to SBET and Smeso but also to the VT and Pw SCP of the adsorbent materials. 
Keywords
Biomass; type of isotherm; non-leaner fits; ATR_FTIR
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