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Hierarchically porous NiAl-LDH nanoparticles as highly efficient adsorbent for p-nitrophenol from water

2015; Elsevier BV; Volume: 349; Linguagem: Inglês

10.1016/j.apsusc.2015.05.041

1873-5584

Yayue Sun, Jiabin Zhou, Weiquan Cai, Ru‐Song Zhao, Yuan Jinpeng,

Supercapacitor Materials and Fabrication

Nickel aluminum layered double hydroxides (LDHs) fabricated via sodium citrate (SC) assistant hydrothermal route were evaluated for removing p-nitrophenol from aqueous solutions. The characterization results indicate that the NiAl-LDHs nanoparticles have well-ordered layer structure with highly crystalline nature. The NiAl-LDH possessed hierarchically porous nanoarchitectures with high surface area (108.7 m2/g) and great pore volume (0.41 cm3/g). Meanwhile, interlamellar spacing of NiAl-LDH was increased to 0.73 nm, demonstrating that the citric acid ion was intercalated into NiAl-LDH in vertical alignment. The morphology of NiAl-LDH changed from a series of disordered growth hexagon nanosheets to the flower-like microspheres with modification of variable sodium citrate. The adsorption isotherms of p-nitrophenol on NiAl-LDHs obey the Langmuir equation. It is worthy to note that the NiAl-LDH modified by sodium citrate with the addition of 2.316 g exhibits excellent adsorption performance with the maximum p-nitrophenol adsorption capacity of 77.7 mg/g.