Phosphate capture by ultrathin MgAl layered double hydroxide nanoparticles

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	Phosphate capture by ultrathin MgAl layered double hydroxide nanoparticles
	Liu, Chen ; Zhang, Meiyi ; Pan, Gang ; Lundehoj, Laura ; Nielsen, Ulla Gro ; Shi, Yi ; Hansen, Hans Christian Bruun
刊名	APPLIED CLAY SCIENCE
	2019-09-01
卷号	177 页码:82-90
关键词	Phosphate removal Hydrotalcite-like compounds Nanosheets Adsorption Wastewater
ISSN号	0169-1317
英文摘要	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 degrees C in the presence of urea resulted in the desired LDH with variable admixtures of amorphous aluminum hydroxide (16-38%) quantified from solid state Al-27 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 similar to 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 P-31 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.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/43204]
专题	生态环境研究中心_环境纳米材料实验室
作者单位	1.Nottingham Trent Univ, Ctr Integrated Water Energy Food Studies iWEF, Southwell NG25 0QF, Notts, England 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Liu, Chen,Zhang, Meiyi,Pan, Gang,et al. Phosphate capture by ultrathin MgAl layered double hydroxide nanoparticles[J]. APPLIED CLAY SCIENCE,2019,177:82-90.
APA	Liu, Chen.,Zhang, Meiyi.,Pan, Gang.,Lundehoj, Laura.,Nielsen, Ulla Gro.,...&Hansen, Hans Christian Bruun.(2019).Phosphate capture by ultrathin MgAl layered double hydroxide nanoparticles.APPLIED CLAY SCIENCE,177,82-90.
MLA	Liu, Chen,et al."Phosphate capture by ultrathin MgAl layered double hydroxide nanoparticles".APPLIED CLAY SCIENCE 177(2019):82-90.