Adsorptive removal of P(V) and Cr(VI) by calcined Zn-Al-Fe ternary LDHs

The present study deals with the preparation and structural and adsorbent characterization of the ternary layered double hydroxides (LDHs; ZFA-HT) with molar ratio Zn2+/Al3+/Fe3+ = 2/0.5/0.5 and its product calcined (ZFA-350) at 350 °C, which is examined for the removal of phosphate P(V) and chromat...

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Autores principales:	Nacera Rezak, Abdellah Bahmani, Nourredine Bettahar
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	adsorption chromate hydrotalcite layered double hydroxides phosphate pollutant Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/ac0a9d66f92c46fc83beec3b0c43b89f
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spelling	oai:doaj.org-article:ac0a9d66f92c46fc83beec3b0c43b89f2021-11-06T11:05:39ZAdsorptive removal of P(V) and Cr(VI) by calcined Zn-Al-Fe ternary LDHs0273-12231996-973210.2166/wst.2021.123https://doaj.org/article/ac0a9d66f92c46fc83beec3b0c43b89f2021-05-01T00:00:00Zhttp://wst.iwaponline.com/content/83/10/2504https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732The present study deals with the preparation and structural and adsorbent characterization of the ternary layered double hydroxides (LDHs; ZFA-HT) with molar ratio Zn2+/Al3+/Fe3+ = 2/0.5/0.5 and its product calcined (ZFA-350) at 350 °C, which is examined for the removal of phosphate P(V) and chromate Cr(VI) from aqueous media. The as-obtained materials are characterized by X-ray diffraction (XRD), Fourier-transform infrared (FT-IR), thermogravimetric analysis-differential scanning calorimetry (TGA–DSC), scanning electron microscopy-X-ray energy dispersion (SEM-EDX) and Brunauer–Emmett–Teller (BET). Structural characterizations show that the LDHs is successfully synthesized and its calcined product is a mixed oxide. Batch sorption studies are conducted to investigate the effects of various experimental parameters such as contact time, solution pH, adsorbent amount, initial P(V) or Cr(VI) concentration and temperature. The isotherms, kinetics and thermodynamic parameters of adsorption of phosphate and chromium are studied. The adsorption processes are well described by the pseudo-second-order kinetic model than the other models examined. The adsorption isotherms data fit best to the Langmuir isotherm model instead of Freundlich and Dubinin–Radushkevich models. The maximum monolayer adsorption capacity of ZFA-350 was found to be 140.85 mg/g for P(V) and 52.63 mg/g for Cr(VI). The positive ΔH and ΔS and negative ΔG values reveal that the P(V) and Cr(VI) sorption onto ZFA-350 is endothermic, irreversible and spontaneous in nature. HIGHLIGHTS Synthesis and characterization of [Zn-Al-Fe-CO3] LDHs and its calcined product.; Adsorption of P(V) and Cr(VI) follow the Langmuir isotherm model and pseudo-second-order kinetics.; Thermodynamic analysis exhibits the spontaneous and endothermic nature of the sorption process.; Improvement of the adsorption capacities of P(V) and Cr(VI) compared to other adsorbents used.;Nacera RezakAbdellah BahmaniNourredine BettaharIWA Publishingarticleadsorptionchromatehydrotalcitelayered double hydroxidesphosphatepollutantEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 10, Pp 2504-2517 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	adsorption chromate hydrotalcite layered double hydroxides phosphate pollutant Environmental technology. Sanitary engineering TD1-1066
spellingShingle	adsorption chromate hydrotalcite layered double hydroxides phosphate pollutant Environmental technology. Sanitary engineering TD1-1066 Nacera Rezak Abdellah Bahmani Nourredine Bettahar Adsorptive removal of P(V) and Cr(VI) by calcined Zn-Al-Fe ternary LDHs
description	The present study deals with the preparation and structural and adsorbent characterization of the ternary layered double hydroxides (LDHs; ZFA-HT) with molar ratio Zn2+/Al3+/Fe3+ = 2/0.5/0.5 and its product calcined (ZFA-350) at 350 °C, which is examined for the removal of phosphate P(V) and chromate Cr(VI) from aqueous media. The as-obtained materials are characterized by X-ray diffraction (XRD), Fourier-transform infrared (FT-IR), thermogravimetric analysis-differential scanning calorimetry (TGA–DSC), scanning electron microscopy-X-ray energy dispersion (SEM-EDX) and Brunauer–Emmett–Teller (BET). Structural characterizations show that the LDHs is successfully synthesized and its calcined product is a mixed oxide. Batch sorption studies are conducted to investigate the effects of various experimental parameters such as contact time, solution pH, adsorbent amount, initial P(V) or Cr(VI) concentration and temperature. The isotherms, kinetics and thermodynamic parameters of adsorption of phosphate and chromium are studied. The adsorption processes are well described by the pseudo-second-order kinetic model than the other models examined. The adsorption isotherms data fit best to the Langmuir isotherm model instead of Freundlich and Dubinin–Radushkevich models. The maximum monolayer adsorption capacity of ZFA-350 was found to be 140.85 mg/g for P(V) and 52.63 mg/g for Cr(VI). The positive ΔH and ΔS and negative ΔG values reveal that the P(V) and Cr(VI) sorption onto ZFA-350 is endothermic, irreversible and spontaneous in nature. HIGHLIGHTS Synthesis and characterization of [Zn-Al-Fe-CO3] LDHs and its calcined product.; Adsorption of P(V) and Cr(VI) follow the Langmuir isotherm model and pseudo-second-order kinetics.; Thermodynamic analysis exhibits the spontaneous and endothermic nature of the sorption process.; Improvement of the adsorption capacities of P(V) and Cr(VI) compared to other adsorbents used.;
format	article
author	Nacera Rezak Abdellah Bahmani Nourredine Bettahar
author_facet	Nacera Rezak Abdellah Bahmani Nourredine Bettahar
author_sort	Nacera Rezak
title	Adsorptive removal of P(V) and Cr(VI) by calcined Zn-Al-Fe ternary LDHs
title_short	Adsorptive removal of P(V) and Cr(VI) by calcined Zn-Al-Fe ternary LDHs
title_full	Adsorptive removal of P(V) and Cr(VI) by calcined Zn-Al-Fe ternary LDHs
title_fullStr	Adsorptive removal of P(V) and Cr(VI) by calcined Zn-Al-Fe ternary LDHs
title_full_unstemmed	Adsorptive removal of P(V) and Cr(VI) by calcined Zn-Al-Fe ternary LDHs
title_sort	adsorptive removal of p(v) and cr(vi) by calcined zn-al-fe ternary ldhs
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/ac0a9d66f92c46fc83beec3b0c43b89f
work_keys_str_mv	AT nacerarezak adsorptiveremovalofpvandcrvibycalcinedznalfeternaryldhs AT abdellahbahmani adsorptiveremovalofpvandcrvibycalcinedznalfeternaryldhs AT nourredinebettahar adsorptiveremovalofpvandcrvibycalcinedznalfeternaryldhs
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Adsorptive removal of P(V) and Cr(VI) by calcined Zn-Al-Fe ternary LDHs

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