TY - JOUR
T1 - Removal of perchlorate in water by calcined MgAl-CO3 layered double hydroxides
AU - Yiqiong, Yang
AU - Naiyun, Gao
AU - Yang, Deng
AU - Guoping, Yu
PY - 2013/4
Y1 - 2013/4
N2 - 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.
AB - 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.
KW - Calcination
KW - Layered double hydroxides
KW - Perchlorate removal
UR - http://www.scopus.com/inward/record.url?scp=84878757559&partnerID=8YFLogxK
U2 - 10.2175/106143013X13596524516103
DO - 10.2175/106143013X13596524516103
M3 - Article
C2 - 23697237
AN - SCOPUS:84878757559
SN - 1061-4303
VL - 85
SP - 331
EP - 339
JO - Water Environment Research
JF - Water Environment Research
IS - 4
ER -