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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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 |
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