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Phosphate capture by ultrathin MgAl layered double hydroxide nanoparticles
https://orcid.org/0000-0003-0920-3018
https://orcid.org/0000-0003-1377-6644
https://orcid.org/0000-0002-2336-3061
Abstract Capture of phosphorus from runoff and wastewater is of high priority in order to reclaim phosphorus for food security and to prevent water pollution. Here we report an environmentally friendly method to synthesize ultrathin MgAl layered double hydroxide (LDH) nanoparticles for phosphorus adsorption. Fast co-precipitation of magnesium and aluminum at 25–80 °C in the presence of urea resulted in the desired LDH with variable admixtures of amorphous aluminum hydroxide (16–38%) quantified from solid state 27Al MAS NMR. Freshly synthesized particles appeared as exfoliated single layers that upon drying stacked to form particles with thickness of 3 to 5 nm (four to six LDH layers) and lateral sizes of ~30 nm, as seen by XRD, SEM, TEM, and AFM. Phosphate adsorption on LDH nanoparticles synthesized at room temperature (LDHns-U25) was very fast and reaction reached equilibrium within 15 min at pH 8.5. The freeze-dried LDHns-U25 nanoparticles exhibited phosphate sorption capacity of 98 ± 15 mg P·g−1, which is 55% higher than for conventional LDH. Phosphate was bound to LDH electrostatically and via inner-sphere surface complexation as evidenced from a combination of 31P MAS NMR spectroscopy, surface potential measurements, IR spectroscopy, and ionic strength effects on phosphate sorption. This study demonstrates that urea-facilitated synthesis of LDH nanoparticles provides high capacity phosphate sorbents with potentials for phosphate recovery from waste waters.
Graphical abstract Display Omitted
Highlights Fast one-step synthesis of 3–5 nm thick LDH nanoparticles using urea as a dispersing agent LDH nanoparticles exhibits fast phosphate sorption (minutes) and high adsorption capacity (98 mg P g−1) Phosphate binds to LDH by inner-sphere surface complexation and by intercalation
Phosphate capture by ultrathin MgAl layered double hydroxide nanoparticles
https://orcid.org/0000-0003-0920-3018
https://orcid.org/0000-0003-1377-6644
https://orcid.org/0000-0002-2336-3061
Abstract Capture of phosphorus from runoff and wastewater is of high priority in order to reclaim phosphorus for food security and to prevent water pollution. Here we report an environmentally friendly method to synthesize ultrathin MgAl layered double hydroxide (LDH) nanoparticles for phosphorus adsorption. Fast co-precipitation of magnesium and aluminum at 25–80 °C in the presence of urea resulted in the desired LDH with variable admixtures of amorphous aluminum hydroxide (16–38%) quantified from solid state 27Al MAS NMR. Freshly synthesized particles appeared as exfoliated single layers that upon drying stacked to form particles with thickness of 3 to 5 nm (four to six LDH layers) and lateral sizes of ~30 nm, as seen by XRD, SEM, TEM, and AFM. Phosphate adsorption on LDH nanoparticles synthesized at room temperature (LDHns-U25) was very fast and reaction reached equilibrium within 15 min at pH 8.5. The freeze-dried LDHns-U25 nanoparticles exhibited phosphate sorption capacity of 98 ± 15 mg P·g−1, which is 55% higher than for conventional LDH. Phosphate was bound to LDH electrostatically and via inner-sphere surface complexation as evidenced from a combination of 31P MAS NMR spectroscopy, surface potential measurements, IR spectroscopy, and ionic strength effects on phosphate sorption. This study demonstrates that urea-facilitated synthesis of LDH nanoparticles provides high capacity phosphate sorbents with potentials for phosphate recovery from waste waters.
Graphical abstract Display Omitted
Highlights Fast one-step synthesis of 3–5 nm thick LDH nanoparticles using urea as a dispersing agent LDH nanoparticles exhibits fast phosphate sorption (minutes) and high adsorption capacity (98 mg P g−1) Phosphate binds to LDH by inner-sphere surface complexation and by intercalation
Phosphate capture by ultrathin MgAl layered double hydroxide nanoparticles
https://orcid.org/0000-0003-0920-3018
https://orcid.org/0000-0003-1377-6644
https://orcid.org/0000-0002-2336-3061
Abstract Capture of phosphorus from runoff and wastewater is of high priority in order to reclaim phosphorus for food security and to prevent water pollution. Here we report an environmentally friendly method to synthesize ultrathin MgAl layered double hydroxide (LDH) nanoparticles for phosphorus adsorption. Fast co-precipitation of magnesium and aluminum at 25–80 °C in the presence of urea resulted in the desired LDH with variable admixtures of amorphous aluminum hydroxide (16–38%) quantified from solid state 27Al MAS NMR. Freshly synthesized particles appeared as exfoliated single layers that upon drying stacked to form particles with thickness of 3 to 5 nm (four to six LDH layers) and lateral sizes of ~30 nm, as seen by XRD, SEM, TEM, and AFM. Phosphate adsorption on LDH nanoparticles synthesized at room temperature (LDHns-U25) was very fast and reaction reached equilibrium within 15 min at pH 8.5. The freeze-dried LDHns-U25 nanoparticles exhibited phosphate sorption capacity of 98 ± 15 mg P·g−1, which is 55% higher than for conventional LDH. Phosphate was bound to LDH electrostatically and via inner-sphere surface complexation as evidenced from a combination of 31P MAS NMR spectroscopy, surface potential measurements, IR spectroscopy, and ionic strength effects on phosphate sorption. This study demonstrates that urea-facilitated synthesis of LDH nanoparticles provides high capacity phosphate sorbents with potentials for phosphate recovery from waste waters.
Graphical abstract Display Omitted
Highlights Fast one-step synthesis of 3–5 nm thick LDH nanoparticles using urea as a dispersing agent LDH nanoparticles exhibits fast phosphate sorption (minutes) and high adsorption capacity (98 mg P g−1) Phosphate binds to LDH by inner-sphere surface complexation and by intercalation
Phosphate capture by ultrathin MgAl layered double hydroxide nanoparticles
Liu, Chen (author) / Zhang, Meiyi (author) / Pan, Gang (author) / Lundehøj, Laura (author) / Nielsen, Ulla Gro (author) / Shi, Yi (author) / Hansen, Hans Christian Bruun (author)
Applied Clay Science ; 177 ; 82-90
2019-04-17
9 pages
Article (Journal)
Electronic Resource
English
MgAl- Layered Double Hydroxide Nanoparticles for controlled release of Salicylate
| British Library Online Contents | 2016
MgAl- Layered Double Hydroxide Nanoparticles for controlled release of Salicylate
| British Library Online Contents | 2016
MgAl- Layered Double Hydroxide Nanoparticles for controlled release of Salicylate
| British Library Online Contents | 2016
MgAl- Layered Double Hydroxide Nanoparticles for controlled release of Salicylate
| British Library Online Contents | 2016
MgAl- Layered Double Hydroxide Nanoparticles for controlled release of Salicylate
| British Library Online Contents | 2016