Removal of perchlorate in water by calcined MgAl-CO3 layered double hydroxides

Yang Yiqiong, Gao Naiyun, Deng Yang, Yu Guoping

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Perchlorate is widely known as an inorganic endocrine disruptor. In this study, MgAl-CO3 layered double hydroxides with different Mg/Al molar ratios were prepared using a coprecipitation method and followed by a calcination process at a temperature range of 300 to 7008C. Results showed that the best synthesis conditions were a calcination temperature of 550°C and Mg/Al molar ratio of 3. Further, the adsorbent and its adsorption product were characterized by x-ray diffraction, Fourier transform-infrared spectroscopy, and thermogravimetric-differential thermal analysis. The layered double hydroxides structures in the adsorbent were lost during calcination at 550°C but were reconstructed subsequent to adsorption of perchlorate, indicating that the "memory effect" appeared to play an important role in perchlorate adsorption. The perchlorate adsorption pattern was best described by the pseudo-second-order kinetics model, while the Freundlich isotherms appropriately explained perchlorate adsorption data.

Original languageEnglish
Pages (from-to)331-339
Number of pages9
JournalWater Environment Research
Volume85
Issue number4
DOIs
StatePublished - Apr 2013

Keywords

  • Calcination
  • Layered double hydroxides
  • Perchlorate removal

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