TY - JOUR
T1 - Adsorption of fluoride by waste iron oxide
T2 - The effects of solution pH, major coexisting anions, and adsorbent calcination temperature
AU - Huang, Yao Hui
AU - Shih, Yu Jen
AU - Chang, Chia Chi
N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/2/28
Y1 - 2011/2/28
N2 - In this study, a waste iron oxide material (BT3), which is a by-product of the fluidized-bed Fenton reaction (FBR-Fenton), was thermally treated between 200 and 900°C and was used as an efficient adsorbent for the removal of fluoride ions in an aqueous system. The highest fluoride adsorption capacity occurred at the termination of the BT3 goethite dehydroxylation phase at about 300°C calcination where both the volume of nanopores formed by dehydroxylation and the specific surface area reached their maximum values. Above 300°C, BT3 transformed to the hematite phase in which fluoride adsorption capacity decreased as calcination temperature increased. On the other hand, the effect of pH on the fluoride adsorption capacity of BT3 for various initial fluoride concentrations was examined. The optimum pH value was found to be about 4. After that efficiency decreased as pH became more alkaline. Finally, coexisting anions affected the fluoride adsorption capacity of BT3 at pH 3.9±0.2 in this order: PO43->SO42->Cl->NO3-.
AB - In this study, a waste iron oxide material (BT3), which is a by-product of the fluidized-bed Fenton reaction (FBR-Fenton), was thermally treated between 200 and 900°C and was used as an efficient adsorbent for the removal of fluoride ions in an aqueous system. The highest fluoride adsorption capacity occurred at the termination of the BT3 goethite dehydroxylation phase at about 300°C calcination where both the volume of nanopores formed by dehydroxylation and the specific surface area reached their maximum values. Above 300°C, BT3 transformed to the hematite phase in which fluoride adsorption capacity decreased as calcination temperature increased. On the other hand, the effect of pH on the fluoride adsorption capacity of BT3 for various initial fluoride concentrations was examined. The optimum pH value was found to be about 4. After that efficiency decreased as pH became more alkaline. Finally, coexisting anions affected the fluoride adsorption capacity of BT3 at pH 3.9±0.2 in this order: PO43->SO42->Cl->NO3-.
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U2 - 10.1016/j.jhazmat.2010.12.025
DO - 10.1016/j.jhazmat.2010.12.025
M3 - Article
C2 - 21195545
AN - SCOPUS:79751523979
VL - 186
SP - 1355
EP - 1359
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
SN - 0304-3894
IS - 2-3
ER -