Investigating the role of the morphology of the Zn-Al LDH on the adsorption of humic acid from aqueous solutions

Flake Zn-Al layered double hydroxides (FLDHs) and microspheres of LDH (MLDHs) were fabricated with a simple hydrothermal method to investigate the role of the morphology of Zn-Al LDH for humic acid (HA) adsorption from synthetic solutions and natural water. The effect of process variables, i.e. cont...

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Autores principales:	Hamid Khoshalhan Davoudli, Solmaz Saadat, Mansour Rahsepar, Fatemeh Azadi
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	adsorption flake zn/al ldh humic acid water treatment zn/al ldh microspheres Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/5d14058393334315877a6edf9d3b82ac
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spelling	oai:doaj.org-article:5d14058393334315877a6edf9d3b82ac2021-11-06T11:24:17ZInvestigating the role of the morphology of the Zn-Al LDH on the adsorption of humic acid from aqueous solutions0273-12231996-973210.2166/wst.2021.373https://doaj.org/article/5d14058393334315877a6edf9d3b82ac2021-10-01T00:00:00Zhttp://wst.iwaponline.com/content/84/7/1663https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Flake Zn-Al layered double hydroxides (FLDHs) and microspheres of LDH (MLDHs) were fabricated with a simple hydrothermal method to investigate the role of the morphology of Zn-Al LDH for humic acid (HA) adsorption from synthetic solutions and natural water. The effect of process variables, i.e. contact time, initial concentration of HA, pH, and competitive ions on the adsorption was investigated. HA removal mechanism was also studied. The two adsorbents exhibited different adsorption behaviors for HA in the presence and absence of background ions, which may be highly correlated with the various adsorption mechanisms involved. Comparison of the HA removal capacity of these two adsorbents implies the superior adsorption capability of FLDH for removal of HA from synthetic solutions (9.5 mg/g), while the adsorption capacity of MLDH was higher for natural organic matters present in natural water samples containing co-existing ions (8.9 mg/g). The pseudo-second-order kinetics model and Longmuir isotherm model could adequately interpret the HA adsorption process for the studied adsorbents. Both LDHs exhibited good regeneration and recycling abilities. HIGHLIGHTS Morphology of LDH and presence of salts affect the removal mechanism of HA.; Presence of electrolytes in solution resulted in reducing the size of the HA.; In the absence of salts, removal of HA by MLDH was more through ligand exchange.; For FLDH, removal mechanism was an equal combination of both ligand and ion exchange.; MLDH could be a promising adsorbent for HA removal in multi-salt solutions.;Hamid Khoshalhan DavoudliSolmaz SaadatMansour RahseparFatemeh AzadiIWA Publishingarticleadsorptionflake zn/al ldhhumic acidwater treatmentzn/al ldh microspheresEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 7, Pp 1663-1677 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	adsorption flake zn/al ldh humic acid water treatment zn/al ldh microspheres Environmental technology. Sanitary engineering TD1-1066
spellingShingle	adsorption flake zn/al ldh humic acid water treatment zn/al ldh microspheres Environmental technology. Sanitary engineering TD1-1066 Hamid Khoshalhan Davoudli Solmaz Saadat Mansour Rahsepar Fatemeh Azadi Investigating the role of the morphology of the Zn-Al LDH on the adsorption of humic acid from aqueous solutions
description	Flake Zn-Al layered double hydroxides (FLDHs) and microspheres of LDH (MLDHs) were fabricated with a simple hydrothermal method to investigate the role of the morphology of Zn-Al LDH for humic acid (HA) adsorption from synthetic solutions and natural water. The effect of process variables, i.e. contact time, initial concentration of HA, pH, and competitive ions on the adsorption was investigated. HA removal mechanism was also studied. The two adsorbents exhibited different adsorption behaviors for HA in the presence and absence of background ions, which may be highly correlated with the various adsorption mechanisms involved. Comparison of the HA removal capacity of these two adsorbents implies the superior adsorption capability of FLDH for removal of HA from synthetic solutions (9.5 mg/g), while the adsorption capacity of MLDH was higher for natural organic matters present in natural water samples containing co-existing ions (8.9 mg/g). The pseudo-second-order kinetics model and Longmuir isotherm model could adequately interpret the HA adsorption process for the studied adsorbents. Both LDHs exhibited good regeneration and recycling abilities. HIGHLIGHTS Morphology of LDH and presence of salts affect the removal mechanism of HA.; Presence of electrolytes in solution resulted in reducing the size of the HA.; In the absence of salts, removal of HA by MLDH was more through ligand exchange.; For FLDH, removal mechanism was an equal combination of both ligand and ion exchange.; MLDH could be a promising adsorbent for HA removal in multi-salt solutions.;
format	article
author	Hamid Khoshalhan Davoudli Solmaz Saadat Mansour Rahsepar Fatemeh Azadi
author_facet	Hamid Khoshalhan Davoudli Solmaz Saadat Mansour Rahsepar Fatemeh Azadi
author_sort	Hamid Khoshalhan Davoudli
title	Investigating the role of the morphology of the Zn-Al LDH on the adsorption of humic acid from aqueous solutions
title_short	Investigating the role of the morphology of the Zn-Al LDH on the adsorption of humic acid from aqueous solutions
title_full	Investigating the role of the morphology of the Zn-Al LDH on the adsorption of humic acid from aqueous solutions
title_fullStr	Investigating the role of the morphology of the Zn-Al LDH on the adsorption of humic acid from aqueous solutions
title_full_unstemmed	Investigating the role of the morphology of the Zn-Al LDH on the adsorption of humic acid from aqueous solutions
title_sort	investigating the role of the morphology of the zn-al ldh on the adsorption of humic acid from aqueous solutions
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/5d14058393334315877a6edf9d3b82ac
work_keys_str_mv	AT hamidkhoshalhandavoudli investigatingtheroleofthemorphologyoftheznalldhontheadsorptionofhumicacidfromaqueoussolutions AT solmazsaadat investigatingtheroleofthemorphologyoftheznalldhontheadsorptionofhumicacidfromaqueoussolutions AT mansourrahsepar investigatingtheroleofthemorphologyoftheznalldhontheadsorptionofhumicacidfromaqueoussolutions AT fatemehazadi investigatingtheroleofthemorphologyoftheznalldhontheadsorptionofhumicacidfromaqueoussolutions
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Investigating the role of the morphology of the Zn-Al LDH on the adsorption of humic acid from aqueous solutions

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