Preparation of Synthetic Clays to Remove Phosphates and Ibuprofen in Water

The main objective of this study consists in the synthesis of a layered double hydroxide (LDH) clay doped with magnesium and aluminum in order to test the removal of phosphates and ibuprofen in water. Two different LDH composites are assessed: oven-dried (LDH<sub>D</sub>) and calcined (L...

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Main Authors:	Rosa Devesa-Rey, Jesús del Val, Jorge Feijoo, José P. González-Coma, Gonzalo Castiñeira, Lorena González-Gil
Format:	Article
Language:	English
Published:	MDPI AG 2021-08-01
Series:	Water
Subjects:	eutrophication hydrotalcite adsorption kinetics
Online Access:	https://www.mdpi.com/2073-4441/13/17/2394

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spelling	doaj-a0e68eabfe5045128b295b226b1c49a62021-09-09T13:59:47ZengMDPI AGWater2073-44412021-08-01132394239410.3390/w13172394Preparation of Synthetic Clays to Remove Phosphates and Ibuprofen in WaterRosa Devesa-Rey0Jesús del Val1Jorge Feijoo2José P. González-Coma3Gonzalo Castiñeira4Lorena González-Gil5Defense University Center at the Spanish Naval Academy, University of Vigo, Plaza de España 2, Marín, 36920 Pontevedra, SpainDefense University Center at the Spanish Naval Academy, University of Vigo, Plaza de España 2, Marín, 36920 Pontevedra, SpainDefense University Center at the Spanish Naval Academy, University of Vigo, Plaza de España 2, Marín, 36920 Pontevedra, SpainDefense University Center at the Spanish Naval Academy, University of Vigo, Plaza de España 2, Marín, 36920 Pontevedra, SpainDefense University Center at the Spanish Naval Academy, University of Vigo, Plaza de España 2, Marín, 36920 Pontevedra, SpainDefense University Center at the Spanish Naval Academy, University of Vigo, Plaza de España 2, Marín, 36920 Pontevedra, SpainThe main objective of this study consists in the synthesis of a layered double hydroxide (LDH) clay doped with magnesium and aluminum in order to test the removal of phosphates and ibuprofen in water. Two different LDH composites are assessed: oven-dried (LDH<sub>D</sub>) and calcined (LDH<sub>C</sub>). Single adsorptions of phosphate and ibuprofen showed up to 70% and 58% removal in water, when LDH<sub>C</sub> was used. A poorer performance was observed for LDH<sub>D</sub>, which presented adsorption efficiencies of 52% and 35%, respectively. The simultaneous removal of phosphate and ibuprofen in water showed that LDH<sub>C</sub> allows a greater reduction in the concentration of both compounds than LDH<sub>D</sub>. Phosphate adsorption showed a close agreement between the experimental and theoretical capacities predicted by the pseudo-second-order model, whereas ibuprofen fitted to a first-order model. In addition, phosphate adsorption showed a good fit to an intraparticle diffusion model and to Bangham model suggesting that diffusion into pores controls the adsorption process. No other mechanisms may be involved in ibuprofen adsorption, apart from intraparticle diffusion. Finally, phosphate desorption could recover up to 59% of the initial concentration, showing the feasibility of the recuperation of this compound in the LDH.https://www.mdpi.com/2073-4441/13/17/2394eutrophicationhydrotalciteadsorptionkinetics
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Rosa Devesa-Rey Jesús del Val Jorge Feijoo José P. González-Coma Gonzalo Castiñeira Lorena González-Gil
spellingShingle	Rosa Devesa-Rey Jesús del Val Jorge Feijoo José P. González-Coma Gonzalo Castiñeira Lorena González-Gil Preparation of Synthetic Clays to Remove Phosphates and Ibuprofen in Water Water eutrophication hydrotalcite adsorption kinetics
author_facet	Rosa Devesa-Rey Jesús del Val Jorge Feijoo José P. González-Coma Gonzalo Castiñeira Lorena González-Gil
author_sort	Rosa Devesa-Rey
title	Preparation of Synthetic Clays to Remove Phosphates and Ibuprofen in Water
title_short	Preparation of Synthetic Clays to Remove Phosphates and Ibuprofen in Water
title_full	Preparation of Synthetic Clays to Remove Phosphates and Ibuprofen in Water
title_fullStr	Preparation of Synthetic Clays to Remove Phosphates and Ibuprofen in Water
title_full_unstemmed	Preparation of Synthetic Clays to Remove Phosphates and Ibuprofen in Water
title_sort	preparation of synthetic clays to remove phosphates and ibuprofen in water
publisher	MDPI AG
series	Water
issn	2073-4441
publishDate	2021-08-01
description	The main objective of this study consists in the synthesis of a layered double hydroxide (LDH) clay doped with magnesium and aluminum in order to test the removal of phosphates and ibuprofen in water. Two different LDH composites are assessed: oven-dried (LDH<sub>D</sub>) and calcined (LDH<sub>C</sub>). Single adsorptions of phosphate and ibuprofen showed up to 70% and 58% removal in water, when LDH<sub>C</sub> was used. A poorer performance was observed for LDH<sub>D</sub>, which presented adsorption efficiencies of 52% and 35%, respectively. The simultaneous removal of phosphate and ibuprofen in water showed that LDH<sub>C</sub> allows a greater reduction in the concentration of both compounds than LDH<sub>D</sub>. Phosphate adsorption showed a close agreement between the experimental and theoretical capacities predicted by the pseudo-second-order model, whereas ibuprofen fitted to a first-order model. In addition, phosphate adsorption showed a good fit to an intraparticle diffusion model and to Bangham model suggesting that diffusion into pores controls the adsorption process. No other mechanisms may be involved in ibuprofen adsorption, apart from intraparticle diffusion. Finally, phosphate desorption could recover up to 59% of the initial concentration, showing the feasibility of the recuperation of this compound in the LDH.
topic	eutrophication hydrotalcite adsorption kinetics
url	https://www.mdpi.com/2073-4441/13/17/2394
work_keys_str_mv	AT rosadevesarey preparationofsyntheticclaystoremovephosphatesandibuprofeninwater AT jesusdelval preparationofsyntheticclaystoremovephosphatesandibuprofeninwater AT jorgefeijoo preparationofsyntheticclaystoremovephosphatesandibuprofeninwater AT josepgonzalezcoma preparationofsyntheticclaystoremovephosphatesandibuprofeninwater AT gonzalocastineira preparationofsyntheticclaystoremovephosphatesandibuprofeninwater AT lorenagonzalezgil preparationofsyntheticclaystoremovephosphatesandibuprofeninwater
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Preparation of Synthetic Clays to Remove Phosphates and Ibuprofen in Water

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