Zn-M-CO3 Layered Double Hydroxides (M=Fe, Cr, or Al): Synthesis, Characterization, and Removal of Aqueous Indigo Carmine
Salima Bouteraa1*, Fatiha Boukraa Djelllal Saiah1, Sarah Hamouda1,2,
Nourredine Bettahar1
1Laboratory of Inorganic Materials Chemistry and Application, University of Sciences and Technology of Oran – USTO BP. 1505 Oran, Algeria.
2Center of Scientific Research and Technique in Physicochemical Analysis (CRAPC), Bou-Smail, Tipaza, Algeria.
Abstract
In this approach, Zn-M+3 layered double hydroxides (LDHs) with M+3 = Fe, Cr, or Al were synthesized by the co-precipitation method from the aqueous solution at a constant solution pH. The as-synthesized samples were char-acterized by XRD analysis, FTIR spectra, BET techniques and simultaneous thermogravimetric-differential scan-ning calorimetry (TGA/DSC). XRD analysis showed that Zn-Fe-CO3 had the greatest lattices parameters. BET sur-face area of Zn-Fe-CO3 was calculated as 52.24 m2.g-1 and was higher than Zn-Cr-CO3 and Zn-Al-CO3 with 46.70 and 49.99 m2.g-1, respectively. The FTIR spectra clearly confirmed the presence of carbonate anions in the struc-ture of the LDHs. Adsorption experiments for Indigo Carmine (IC), as the main model organic pollutant in this study from aqueous solution onto synthetized samples were carried out in terms of solution pH, contact time and initial dye concentration. Experimental results indicate that the capacity of dye uptake augmented rapidly within the first 15, 40, and 55 minuts for Zn-Fe-CO3, Zn-Cr-CO3 and Zn-Al-CO3 respectively and then stayed practically the same regardless of the concentration. Adsorption kinetics studies revealed that the adsorption process followed pseudo-second order kinetics model instead of a pseudo-first-order model. The adsorption isotherm data follow the Langmuir equation in which parameters are calculated. The maximum Langmuir monolayer adsorption capacities were 94.87, 21.79, and 66.71 mg.g-1 for Zn-Fe-CO3, Zn-Cr-CO3, and Zn-Al-CO3, respectively. The adsorption capaci-ties were slightly influenced by the pH variations from 5 to 10, showing the advantage of using these materials in water treatments in a wide pH range. Finally, the IC removal is proven by the presence of IC functional groups in IR spectra and thermograms. TGA/DSC of Zn-Fe-CO3 obtained after removal of IC indicate that the LDHs stabiliz-es IC and delays the combustion of adsorbed molecules. Copyright © 2020 BCREC Group. All rights reserved
Keywords: Layered Double Hydroxide; Coprecipitation; Characterization; Adsorption; Indigo Carmine
How to Cite: Bouteraa, S., Saiah, F.B.D., Hamouda, S., Bettahar, N. (2020). Zn-M-CO3 Layered Double Hydrox-ides (M=Fe, Cr, or Al): Synthesis, Characterization, and Removal of Aqueous Indigo Carmine. Bulletin of Chemical Reaction Engineering & Catalysis, 15(1): 43-54 (doi:10.9767/bcrec.15.1.5053.43-54)
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