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

• Published in: Applied surface science Vol. 349; pp. 897 - 903
• Main Authors: Sun, Yayue, Zhou, Jiabin, Cai, Weiquan, Zhao, Rusong, Yuan, Jinpeng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.09.2015
• Subjects: Adsorption; Aluminides; Citrates; Intermetallics; NiAl-LDH; Nickel base alloys; Nickel compounds; p-Nitrophenol; Sodium; Sodium citrate; Surface chemistry; p-Nitrophenol; Adsorption; NiAl-LDH; Sodium citrate
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2015.05.041

•Hierarchically porous LDH was prepared via surfactant-assisted hydrothermal route.•LDH showed high specific surface areas and interlayer hydrophobic property.•LDH nanoparticles exhibited strong affinity towards p-nitrophenol in water. 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 (108.7m2/g) and great pore volume (0.41cm3/g). Meanwhile, interlamellar spacing of NiAl-LDH was increased to 0.73nm, 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 2.316g exhibits excellent adsorption performance with the maximum p-nitrophenol adsorption capacity of 77.7mg/g.