TY - JOUR
T1 - Adsorptive removal of fluoride from water by activated carbon derived from CaCl2-modified Crocus sativus leaves
T2 - Equilibrium adsorption isotherms, optimization, and influence of anions
AU - Dehghani, Mohammad Hadi
AU - Farhang, Mansoureh
AU - Alimohammadi, Mahmood
AU - Afsharnia, Mojtaba
AU - Mckay, Gordon
N1 - Publisher Copyright:
© 2018, © 2018 Taylor & Francis.
PY - 2018/7/3
Y1 - 2018/7/3
N2 - A central composite design using response surface methodology was applied for the experimental design and optimization of fluoride adsorption on an activated carbon derived from calcium chloride-modified Crocus sativus leaves (AC-CMCSL). Fluoride removal efficiency as function of independent variables, such as initial fluoride concentration, pH, adsorbent dose, and time has been investigated. The maximum percentage removal of fluoride at optimum conditions (initial fluoride concentration = 6.5 mg L−1, pH = 4.5, adsorbent dose = 15 g L−1 and time = 70 min) was 85.43%. By comparing adsorption isotherm, the Freundlich model provided the best correlation (R2 = 0.99) for the adsorption of fluoride on AC-CMCSL. The maximum adsorption capacity from the Langmuir model (qmax) was 2.01 mg g−1. The influence of the co-existing anions on fluoride adsorption was in the following order: PO4 3− > SO4 2− > Cl− > NO3 −. The results of the present study showed that activated carbon derived from the leaves of calcium chloride-modified Crocus sativus has a good potential for fluoride removal from aqueous solution.
AB - A central composite design using response surface methodology was applied for the experimental design and optimization of fluoride adsorption on an activated carbon derived from calcium chloride-modified Crocus sativus leaves (AC-CMCSL). Fluoride removal efficiency as function of independent variables, such as initial fluoride concentration, pH, adsorbent dose, and time has been investigated. The maximum percentage removal of fluoride at optimum conditions (initial fluoride concentration = 6.5 mg L−1, pH = 4.5, adsorbent dose = 15 g L−1 and time = 70 min) was 85.43%. By comparing adsorption isotherm, the Freundlich model provided the best correlation (R2 = 0.99) for the adsorption of fluoride on AC-CMCSL. The maximum adsorption capacity from the Langmuir model (qmax) was 2.01 mg g−1. The influence of the co-existing anions on fluoride adsorption was in the following order: PO4 3− > SO4 2− > Cl− > NO3 −. The results of the present study showed that activated carbon derived from the leaves of calcium chloride-modified Crocus sativus has a good potential for fluoride removal from aqueous solution.
KW - Activated carbon
KW - Crocus sativus
KW - central composite design
KW - fluoride
KW - response surface methodology
UR - http://www.scopus.com/inward/record.url?scp=85043515835&partnerID=8YFLogxK
U2 - 10.1080/00986445.2018.1423969
DO - 10.1080/00986445.2018.1423969
M3 - Article
AN - SCOPUS:85043515835
SN - 0098-6445
VL - 205
SP - 955
EP - 965
JO - Chemical Engineering Communications
JF - Chemical Engineering Communications
IS - 7
ER -