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Removal of Perchlorate in Water by Calcined MgAl‐CO 3 Layered Double Hydroxides
Author(s) -
Yiqiong Yang,
Naiyun Gao,
Yang Deng,
Guoping Yu
Publication year - 2013
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143013x13596524516103
Subject(s) - calcination , perchlorate , layered double hydroxides , adsorption , thermogravimetric analysis , freundlich equation , inorganic chemistry , coprecipitation , chemistry , langmuir , fourier transform infrared spectroscopy , differential thermal analysis , nuclear chemistry , chemical engineering , catalysis , organic chemistry , ion , physics , optics , diffraction , engineering
Perchlorate is widely known as an inorganic endocrine disruptor. In this study, MgAl‐CO 3 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 700°C. 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.