Comparative Study on Adsorption Isotherm and Kinetics of Defluoridation Using Aluminum and Iron Electrodes in Electrocoagulation

被引：8
|
作者：
Nyangi, Magori J. [1 ,2 ]
Chebude, Yonas [1 ]
Kilulya, Kessy F. [3 ]
Salim, Catherine J. [2 ]
机构：
[1] Addis Ababa Univ, Africa Ctr Excellence Water Management, POB 1176, Addis Ababa, Ethiopia
[2] Water Inst, Dept Water Resources, POB 35059, Dar Es Salaam, Tanzania
[3] Univ Dar Es Salaam, Coll Nat & Appl Sci, Dept Chem, POB 35061, Dar Es Salaam, Tanzania
来源：
CHEMISTRY AFRICA-A JOURNAL OF THE TUNISIAN CHEMICAL SOCIETY | 2021年 / 4卷 / 02期
关键词：
Electrocoagulation; Remediation; Adsorption; Defluoridation; WATER; FLUOROSIS; REMOVAL; MODELS;
D O I：
10.1007/s42250-021-00228-w
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Adsorption equilibrium and kinetics of fluoride removal by aluminum and iron electrodes in electrocoagulation technology were investigated and compared in a batch reactor. Adsorption equilibrium for Al-EC and Fe-EC were conducted at a range of current density (J) 19-38 and 10-18.50 mA/cm(2), respectively, while the treatment time was at a range of 15-60 min to study the adsorption kinetics. The surfaces of flocs produced were characterized using Fourier transform infrared spectroscopy. The adsorption equilibrium and kinetics of fluoride in both Al-EC and Fe-EC fitted well to the Freundlich model and pseudo second order. The removal mechanisms of fluoride were through ion exchange and electrostatic attraction in Al-EC and Fe-EC, respectively both occurred spontaneously and were physical in nature. The Al(OH)(3) and Fe(OH)(2) exhibited monolayer adsorption capacities of 131 and 0.08 mg/g, respectively. Thus, the Al(OH)(3) in Al-EC is a better candidate for defluoridation compared to Fe(OH)(2) of Fe-EC during electrocoagulation technology.
引用
收藏
页码：391 / 398
页数：8
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