SYNTHESIS AND CHARACTERIZATION OF ACTIVATED BENTONITE / Fe3O4 COMPOSITE FOR DECONTAMINATING HEAVY METALS FROM WASTEWATER
Elnagar, R., Hewehy, M., Mohamed, S. (2020). SYNTHESIS AND CHARACTERIZATION OF ACTIVATED BENTONITE / Fe3O4 COMPOSITE FOR DECONTAMINATING HEAVY METALS FROM WASTEWATER. EKB Journal Management System, 49(4), 1-23. doi: 10.21608/jes.2020.163861
Ramy S. Elnagar; Mahmoud A. Hewehy; Sherif F. Mohamed. "SYNTHESIS AND CHARACTERIZATION OF ACTIVATED BENTONITE / Fe3O4 COMPOSITE FOR DECONTAMINATING HEAVY METALS FROM WASTEWATER". EKB Journal Management System, 49, 4, 2020, 1-23. doi: 10.21608/jes.2020.163861
Elnagar, R., Hewehy, M., Mohamed, S. (2020). 'SYNTHESIS AND CHARACTERIZATION OF ACTIVATED BENTONITE / Fe3O4 COMPOSITE FOR DECONTAMINATING HEAVY METALS FROM WASTEWATER', EKB Journal Management System, 49(4), pp. 1-23. doi: 10.21608/jes.2020.163861
Elnagar, R., Hewehy, M., Mohamed, S. SYNTHESIS AND CHARACTERIZATION OF ACTIVATED BENTONITE / Fe3O4 COMPOSITE FOR DECONTAMINATING HEAVY METALS FROM WASTEWATER. EKB Journal Management System, 2020; 49(4): 1-23. doi: 10.21608/jes.2020.163861

SYNTHESIS AND CHARACTERIZATION OF ACTIVATED BENTONITE / Fe3O4 COMPOSITE FOR DECONTAMINATING HEAVY METALS FROM WASTEWATER

Journal of Environmental Science
Article 1, Volume 49, Issue 4, April 2020, Page 1-23  XML PDF (1.02 MB)
Document Type: Original Article
DOI: 10.21608/jes.2020.163861
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Authors
Ramy S. Elnagar* 1; Mahmoud A. Hewehy2; Sherif F. Mohamed3
1Head of Environmental Measurements Branch, Egyptian Armed Forces
2Environmental Basic Science Department, Institute of Environmental Studies and Research, Ain Shams University
3Head of Chemical Analysis Branch, Egyptian Armed Forces
Abstract
In this work, modification of calcium bentonite was carried out by three chemical methods converted calcium bentonite to sodium bentonite then acid activation by sulfuric acid (3M) and finally combined activated bentonite to Fe3O4 nano composite was prepared by chemical co-precipitation method. The prepared samples were characterized by Energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Fourier Transformation Infrared (FTIR) spectroscopy, (BET) surface area, scanning electron microscope (SEM) and High resolution transmission electron microscope (TEM). The characterization study demonstrated a substantial improvement in several adsorptive parameters of modified bentonite, like surface area, surface morphology, and active sites where increase in surface area of the modified bentonite was recorded as 25.259 m²/g, 31.86 m²/g, 62.194 m²/g and 107.998 m²/g by Ca- bentonite, Na-bentonite, acid activated bentonite and nano composite bentonite, respectively. Effects of pH, initial concentration, mass of the adsorbent and the contact time on the adsorption capacity were studied. The results showed that the best pH for adsorption was at pH=6, optimum dose of modified bentonite at 0.5 g and contact time at 15 min. The maximum removal for heavy metals were obtained by bentonite nano composite as (98.4 %) for chromium, (98.8 %) for arsenic, (91.3 %) for selenium, (90.8 %) for molybdenum, (79.1 %) for antimony, (75.3 %) for barium .
Keywords
Adsorption; Heavy metals; Activated bentonite / Fe3O4 nano composite
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