Comparative studies on Cr(VI) ions by reduced graphene oxide and SBA-16 mesoporous silica and their composites with Cu-MOF
Abas, K., Mohamed, G., Sayed Ahmed, S., Fathy, N., abdelmoaty, A. (2025). Comparative studies on Cr(VI) ions by reduced graphene oxide and SBA-16 mesoporous silica and their composites with Cu-MOF. EKB Journal Management System, 68(11), 441-454. doi: 10.21608/ejchem.2025.365156.11383
Khadiga Abas; Ghada Mohamed; Sohair A. Sayed Ahmed; Nady A Fathy; alaa salah abdelmoaty. "Comparative studies on Cr(VI) ions by reduced graphene oxide and SBA-16 mesoporous silica and their composites with Cu-MOF". EKB Journal Management System, 68, 11, 2025, 441-454. doi: 10.21608/ejchem.2025.365156.11383
Abas, K., Mohamed, G., Sayed Ahmed, S., Fathy, N., abdelmoaty, A. (2025). 'Comparative studies on Cr(VI) ions by reduced graphene oxide and SBA-16 mesoporous silica and their composites with Cu-MOF', EKB Journal Management System, 68(11), pp. 441-454. doi: 10.21608/ejchem.2025.365156.11383
Abas, K., Mohamed, G., Sayed Ahmed, S., Fathy, N., abdelmoaty, A. Comparative studies on Cr(VI) ions by reduced graphene oxide and SBA-16 mesoporous silica and their composites with Cu-MOF. EKB Journal Management System, 2025; 68(11): 441-454. doi: 10.21608/ejchem.2025.365156.11383

Comparative studies on Cr(VI) ions by reduced graphene oxide and SBA-16 mesoporous silica and their composites with Cu-MOF

Egyptian Journal of Chemistry
Volume 68, Issue 11, November 2025, Pages 441-454    PDF (430.98 K)
Document Type: Original Article
DOI: 10.21608/ejchem.2025.365156.11383
Authors
Khadiga Abas1; Ghada Mohamed2; Sohair A. Sayed Ahmed3; Nady A Fathy* 4; alaa salah abdelmoaty5
1Researcher, Nrc
2Physical chemistry department, inorganic chemical industries, national research centre
3Physical Chemistry Department, NRC
4Physical Chemistry, Inorganic chemical industries division, National Research Centre,
5inorganic chemistry, faculty of science, national research centre.
Abstract
This work examines the adsorption performance of novel adsorbents such as reduced graphene oxide (GO) and mesoporous silica (SBA-16) which synthesized from rice husk ash, and then composited with Cu-metal organic framework (Cu-MOF) for the first time. XRD, FTIR, EDX, FE-SEM and N2 adsorption techniques were studied. The adsorption performance of investigated adsorbents toward removal of hexavalent chromium (Cr(VI)) ions was carried out as a function of pH and initial concentration of Cr(VI) ions. The obtained GO and SBA-16 samples exhibited a superior porosity than that of Cu-MOF, Cu-MOF/GO and Cu-MOF/SBA-16 that owed to close of internal pores in both GO and SBA-16 samples upon loading Cu-MOF particles. The Langmuir and Temkin models prescribed Cr(VI) adsorption more accurately. The maximum adsorption capacity of Cr(VI) was 86.1 mg/g by GO while 77 and 66.7 mg/g by Cu-MOF/GO and Cu-MOF/SBA-16, respectively. The adsorption Cr(VI) mechanism followed the pseudo-first order kinetic model. Therefore, the as-prepared GO and SBA-16 derived from rice husk ash and their composites with Cu-MOF can candidate as effective adsorbents for removal of Cr(IV) ions from their aqueous media.
Keywords
Rice husk ash; reduced graphene oxide; SBA-16; Cu-MOF; chromium (VI); adsorption
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