Cargando…
Glycine- and Alanine-Intercalated Layered Double Hydroxides as Highly Efficient Adsorbents for Phosphate with Kinetic Advantages
Phosphate is the main cause of eutrophication. Layered double hydroxides (LDH) are considered to be promising phosphate adsorbents due to their high affinity and large capacity. In this study, we partially intercalated zwitterionic glycine and alanine into Cl-LDH (corresponding to MgAl-LDH with inte...
Autores principales: | , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8878144/ https://www.ncbi.nlm.nih.gov/pubmed/35214914 http://dx.doi.org/10.3390/nano12040586 |
_version_ | 1784658592763215872 |
---|---|
author | Zhang, Qian Ji, Fangying Jiang, Lei Shen, Qiushi Mao, Yuanxiang Liu, Caocong |
author_facet | Zhang, Qian Ji, Fangying Jiang, Lei Shen, Qiushi Mao, Yuanxiang Liu, Caocong |
author_sort | Zhang, Qian |
collection | PubMed |
description | Phosphate is the main cause of eutrophication. Layered double hydroxides (LDH) are considered to be promising phosphate adsorbents due to their high affinity and large capacity. In this study, we partially intercalated zwitterionic glycine and alanine into Cl-LDH (corresponding to MgAl-LDH with interlayer anion Cl(−)) and synthesized efficient inorganic–organic nanohybrids for phosphate removal with kinetic advantages. Gly-Cl-LDH, Ala-Cl-LDH and Cl-LDH were characterized, and their phosphate adsorption performances under the influence of environment factors (e.g., solution pH, coexisting anions, contact time and phosphate concentration) were investigated. The results show that Gly-Cl-LDH and Ala-Cl-LDH had larger specific surface areas and larger interlayer spaces than Cl-LDH, and exhibited better adsorption performance at a lower pH and better adsorption selectivity against SO(4)(2−). Kinetic experiments indicated that Gly-Cl-LDH and Ala-Cl-LDH can reduce phosphate concentrations to a lower level in a shorter time. The pseudo-second-order kinetic constants of Gly-Cl-LDH and Ala-Cl-LDH were 1.27 times and 3.17 times of Cl-LDH, respectively (R(2) > 0.996). The maximum adsorption capacities derived from a Langmuir model of Cl-LDH, Gly-Cl-LDH and Ala-Cl-LDH are 63.2 mg-P/L, 55.8 mg-P/L and 58.2 mg-P/L, respectively, which showed superiority over the prevailing phosphate adsorbents. This research provides highly efficient adsorbents for removing phosphate from aqueous solutions. |
format | Online Article Text |
id | pubmed-8878144 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-88781442022-02-26 Glycine- and Alanine-Intercalated Layered Double Hydroxides as Highly Efficient Adsorbents for Phosphate with Kinetic Advantages Zhang, Qian Ji, Fangying Jiang, Lei Shen, Qiushi Mao, Yuanxiang Liu, Caocong Nanomaterials (Basel) Article Phosphate is the main cause of eutrophication. Layered double hydroxides (LDH) are considered to be promising phosphate adsorbents due to their high affinity and large capacity. In this study, we partially intercalated zwitterionic glycine and alanine into Cl-LDH (corresponding to MgAl-LDH with interlayer anion Cl(−)) and synthesized efficient inorganic–organic nanohybrids for phosphate removal with kinetic advantages. Gly-Cl-LDH, Ala-Cl-LDH and Cl-LDH were characterized, and their phosphate adsorption performances under the influence of environment factors (e.g., solution pH, coexisting anions, contact time and phosphate concentration) were investigated. The results show that Gly-Cl-LDH and Ala-Cl-LDH had larger specific surface areas and larger interlayer spaces than Cl-LDH, and exhibited better adsorption performance at a lower pH and better adsorption selectivity against SO(4)(2−). Kinetic experiments indicated that Gly-Cl-LDH and Ala-Cl-LDH can reduce phosphate concentrations to a lower level in a shorter time. The pseudo-second-order kinetic constants of Gly-Cl-LDH and Ala-Cl-LDH were 1.27 times and 3.17 times of Cl-LDH, respectively (R(2) > 0.996). The maximum adsorption capacities derived from a Langmuir model of Cl-LDH, Gly-Cl-LDH and Ala-Cl-LDH are 63.2 mg-P/L, 55.8 mg-P/L and 58.2 mg-P/L, respectively, which showed superiority over the prevailing phosphate adsorbents. This research provides highly efficient adsorbents for removing phosphate from aqueous solutions. MDPI 2022-02-09 /pmc/articles/PMC8878144/ /pubmed/35214914 http://dx.doi.org/10.3390/nano12040586 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Zhang, Qian Ji, Fangying Jiang, Lei Shen, Qiushi Mao, Yuanxiang Liu, Caocong Glycine- and Alanine-Intercalated Layered Double Hydroxides as Highly Efficient Adsorbents for Phosphate with Kinetic Advantages |
title | Glycine- and Alanine-Intercalated Layered Double Hydroxides as Highly Efficient Adsorbents for Phosphate with Kinetic Advantages |
title_full | Glycine- and Alanine-Intercalated Layered Double Hydroxides as Highly Efficient Adsorbents for Phosphate with Kinetic Advantages |
title_fullStr | Glycine- and Alanine-Intercalated Layered Double Hydroxides as Highly Efficient Adsorbents for Phosphate with Kinetic Advantages |
title_full_unstemmed | Glycine- and Alanine-Intercalated Layered Double Hydroxides as Highly Efficient Adsorbents for Phosphate with Kinetic Advantages |
title_short | Glycine- and Alanine-Intercalated Layered Double Hydroxides as Highly Efficient Adsorbents for Phosphate with Kinetic Advantages |
title_sort | glycine- and alanine-intercalated layered double hydroxides as highly efficient adsorbents for phosphate with kinetic advantages |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8878144/ https://www.ncbi.nlm.nih.gov/pubmed/35214914 http://dx.doi.org/10.3390/nano12040586 |
work_keys_str_mv | AT zhangqian glycineandalanineintercalatedlayereddoublehydroxidesashighlyefficientadsorbentsforphosphatewithkineticadvantages AT jifangying glycineandalanineintercalatedlayereddoublehydroxidesashighlyefficientadsorbentsforphosphatewithkineticadvantages AT jianglei glycineandalanineintercalatedlayereddoublehydroxidesashighlyefficientadsorbentsforphosphatewithkineticadvantages AT shenqiushi glycineandalanineintercalatedlayereddoublehydroxidesashighlyefficientadsorbentsforphosphatewithkineticadvantages AT maoyuanxiang glycineandalanineintercalatedlayereddoublehydroxidesashighlyefficientadsorbentsforphosphatewithkineticadvantages AT liucaocong glycineandalanineintercalatedlayereddoublehydroxidesashighlyefficientadsorbentsforphosphatewithkineticadvantages |