Template-free synthesis of an eco-friendly flower-like Mg/Al/Fe-CLDH for efficient arsenate removal from aqueous solutions

Ruiyue Li, Wei Zhan, Yanqing Song, Jirong Lan, Li Guo, Tian C. Zhang, Dongyun Du

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Mg/Al-LDH is widely used in the removal of aqueous pollutants due to the large surface and high anion exchange capacity, but the traditional Mg/Al-LDH for arsenic removal has a narrow range of pH application. The present study focused on the modifying of the lamellar Mg/Al-LDH to synthesize flower-like nanoparticles for arsenate removal in a wide pH range. Results showed that Mg/Al/Fe-CLDH (calcined Mg/Al/Fe-LDH) exhibited an extremely high arsenate removal efficiency (e.g., reducing As(V) from 10 mg/L to 1 µg/L) in a wide pH range (2–12). Furthermore, it can keep excellent removal efficiency for arsenate under a complex anions environment (co-existing with CO32−, SO42−, PO43−, and F), and maintain 80% removal efficiency for arsenate after 4 regeneration cycles. SEM, XRD, and XPS results unveiled the following enhancing mechanism for arsenate removal by using this modified Mg/Al-LDH: 1) partial content of ferric ions were successfully insert into the layers of Mg/Al-LDH and substituted by aluminium ions, which produce more affiliative sites for arsenate and expand its feasibility in a wide pH ranges; 2) the flower-like structures facilitate to offer more adsorption sites for arsenate due to its larger specific surface area. In brief, this flower-like Mg/Al/Fe-CLDH has great application potential for eco-friendly purity of arsenate from complicated industrial wastewater.

Original languageEnglish (US)
Article number120011
JournalSeparation and Purification Technology
Volume282
DOIs
StatePublished - Feb 1 2022

Keywords

  • Adsorption
  • As(V)
  • Flower-like structure
  • Spinel-type mixed oxide
  • Template-free synthesis

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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