Adsorptive removal of fluoride from water by activated carbon derived from CaCl2-modified Crocus sativus leaves: Equilibrium adsorption isotherms, optimization, and influence of anions

被引:111
作者
Dehghani, Mohammad Hadi [1 ,2 ]
Farhang, Mansoureh [1 ]
Alimohammadi, Mahmood [1 ]
Afsharnia, Mojtaba [3 ]
Mckay, Gordon [4 ]
机构
[1] Univ Tehran Med Sci, Sch Publ Hlth, Dept Environm Hlth Engn, Enqelab St,Quds St,Poursina St, Tehran, Iran
[2] Univ Tehran Med Sci, Ctr Solid Waste Res, Inst Environm Res, Tehran, Iran
[3] Gonabad Univ Med Sci, Sch Publ Hlth, Dept Environm Hlth Engn, Gonabad, Iran
[4] Hamad Bin Khalifa Univ, Qatar Fdn, Coll Sci & Engn, Div Sustainabil, Doha, Qatar
关键词
Activated carbon; central composite design; Crocus sativus; fluoride; response surface methodology; RESPONSE-SURFACE METHODOLOGY; ZINC-OXIDE NANOPARTICLES; AQUEOUS-SOLUTION; DRINKING-WATER; WASTE-WATER; DEFLUORIDATION; CHITOSAN; IONS; ADSORBENT; REACTOR;
D O I
10.1080/00986445.2018.1423969
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
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 (R-2 = 0.99) for the adsorption of fluoride on AC-CMCSL. The maximum adsorption capacity from the Langmuir model (q(max)) was 2.01 mg g(-1). The influence of the co-existing anions on fluoride adsorption was in the following order: PO43-> SO42-> 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.
引用
收藏
页码:955 / 965
页数:11
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