Alüminyum elektrotlar kullanılarak elektrokoagülasyon ile sulu çözeltilerden florür giderimi: İzoterm ve kinetik çalışmaları

Öz

Bu çalışmanın ana amacı, alüminyum elektrotlar kullanılarak elektrokoagülasyon tekniği ile sulu çözeltilerden florürün giderilmesidir. Çalışma koşullarını optimize etmek için akım yoğunluğu, zaman ve giriş florür konsantrasyonu gibi çeşitli parametrelerin etkisi üzerine çalışmalar yürütülmüştür. Deneysel çalışmalar, 11 mA/cm² akım yoğunluğu, 30 dk reaksiyon süresi ve 10 mg/L giriş florür konsantrasyonu koşullarında %87,4 maksimum giderim veriminin elde edildiğini göstermiştir. Elektrokoagülasyon mekanizması ve prosesin karakteristik parametreleri isoterm (Langmuir and Freundlich) ve kinetik modeller (1. ve 2. Derece) ile analiz edilmiştir. Deneysel veriler Langmuir ve Freundlich izoterm denklemleri ile uyum sağlamıştır. Kinetik çalışma sonuçları, farklı koşullar altında 2. derece kinetik modelin daha yüksek korelasyon katsayısı sağladığını göstermiştir.

Anahtar Kelimeler

• Elektrokoagülasyon,Florür giderimi,İzoterm ve kinetik modeller

Fluoride removal from aqueous solution by electrocoagulation using aluminium electrodes: Isotherm and kinetic studies

Öz

The main objective of the present study was the removal of fluoride from aqueous solution by electrocoagulation technique using aluminum electrodes. The effect of various parameters such as current density, time and initial fluoride concentration were studied to optimize the conditions. Experimental study showed that maximum removal efficiency (87.4%) was achieved at the conditions of current density 11 mA/cm², reaction time 30 min and initial fluoride concentration 10 mg/L. Isotherm models (Langmuir and Freundlich) and kinetic models (pseudo-first order and pseudo-second order) were used to analyze the electrocoagulation mechanism and characterize the process parameters. Experimental data well fitted with Langmuir and Freundlich isotherm equations and results of the kinetic study indicated that pseudo-second order kinetic model give higher correlation coefficients for different conditions.

Anahtar Kelimeler

• Electrocoagulation,Fluoride removal,Isotherm and kinetic models

Kaynakça

1. Miretzky P, Cirelli AF. “Fluoride removal from water by chitosan derivatives and composites: A review”. Journal of Fluorine Chemistry, 132(4), 231-240, 2011.
2. Yu X, Tong S, Ge M, Zuo J. “Removal of fluoride from drinking water by cellulose @ hydroxyapatite nanocomposites”. Carbohydrate Polymers, 92(1), 269-275, 2013.
3. Meenakshi S, Viswanathan N. “Identification of selective ion-exchange resin for fluoride sorption”. Journal of Colloid and Interface Science, 308(2), 438-450, 2007.
4. Liu JX, Hu Z, Zhu C, Wen G, Meng X. “Removal of fluoride and total dissolved solids from coalbed methane produced water with a movable ultra-low pressure reverse osmosis system” Desalination and Water Treatment, 51(22-24), 4359-4367, 2013.
5. Sujana MG, Mishra A, Acharya BC. “Hydrous ferric oxide doped alginate beads for fluoride removal: Adsorption kinetics and equilibrium studies”. Applied Surface Science, 270, 767-776, 2013.
6. Gong WX, Qu JH, Liu RP, Lan HC. “Effect of aluminum fluoride complexation on fluoride removal by coagulation”. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 395, 88-93, 2012.
7. Bazrafshan E, Ownagh KA, Mahvi AH. “Application of electrocoagulation process using iron and aluminum electrodes for fluoride removal from aqueous environment” E-Journal of Chemistry, 9(4), 2297-2308, 2012.
8. Amor Z, Bariou B, Mameri N, Taky M, Nicolas S, Elmidaoui A. “Fluoride removal from brackish water by electrodialysis”. Desalination, 133(3), 215-223, 2001.

9. Sandoval MA, Fuentes R, Nava JL, Rodríguez I. “Fluoride removal from drinking water by electrocoagulation in a continuous filter press reactor coupled to a flocculator and clarifier”. Separation and Purification Technology, 134, 163-170, 2014.
10. Maleki A, Mahvi AH, Daraei H, Rezaei R, Meihami N, Mohammadi K, Zandia SS. “Influence of selected anions on fluoride removal in electrocoagulation/electroflotation”. Research Report Fluoride, 48(1), 23-47, 2015.
11. Rajeshwar K, Ibanez J, Swain GW. “Electrochemistry and the environment”. Journal of Applied Electrochemistry, 24 (11), 1077-1091, 1994.
12. Valero D, Ortiz JM, Garcia V, Exposito E, Montiel V, Aldaz A. “Electrocoagulation of wastewater from almond industry”. Chemosphere, 84(9), 1290-1295, 2011.
13. Kitagaki T, Hoshino T, Sambommatsu Y, Yano K, Takeuchi M, Igarashi T, Suzuki T. “Fission product separationfrom seawater by electrocoagulation method”. Journal of Radioanalytical and Nuclear Chemistry, 296, 975-979, 2013.
14. Kamaraj R, Vasudevan SS. “Evaluation of electrocoagulation process for theremoval of strontium and cesium from aqueous solution”. Chemical Engineering Research and Design, 93, 522-530, 2015.
15. Hu CY, Lo SL, Kuan WH. “Effects of co-existing anions on fluoride removal inelectrocoagulation (EC) process using aluminum electrodes”. Water Research, 37(18), 4513-4523, 2003.
16. Zuo Q, Chen X, Li W, Chen G. “Combined electrocoagulation and electroflotation for removal of fluoride from drinking water”. Journal of Hazardous Materials, 159(2-3), 452-457, 2008.
17. Ghanizadeh G, Shariati neghab G, Salem M, Khalagi K. “Taguchi experimental design for electrocoagulation process using alternating and direct current on fluoride removal from water”. Desalination and Water Treatment, 57(27), 12675-12683, 2015.
18. Zhang C, Tan S, Niu X, Su P. “Treatment of geothermal water with high fluoride content by electrocoagulation”. Desalination and Water Treatment, 54(8), 2223-2227, 2015.
19. Sridhar R, Sivakumar V, Immanuel VP, Maran JP “Treatment of pulp and paper industry bleaching effluent by electrocoagulant process”. Journal of Hazardous Material, 186(2-3), 1495-1502, 2011.
20. Emamjomeh MM ve Sivakumar M “Fluoride removal by a continuous flow electrocoagulation reactor”. Journal of Environmental Management, 90(2), 102-1212.
21. Chen X, Chen G, Yue PL. “Separation of pollutants from restaurant wastewater by electrocoagulation”. Separation and Purification Technology, 19(1-2), 65-76, 2000.
22. Chen G. “Electrochemical technologies in wastewater treatment”. Separation and Purification Technology, 38(1), 11-41, 2004.
23. Sekman E, Top S, Uslu E, Varank G, Bilgili MS. “Treatment of oily wastewater from port waste reception facilities by electrocoagulation”. International Journal Environmental Research, 5(4), 1079-1086, 2011.
24. Bensadok K, Benammara S, Lapicque F, Nezzal G. “Electrocoagulation of cutting oil emulsions using aluminium plate electrodes”. Journal of Hazardous Material, 152(1), 423-430, 2008.
25. Sathishkumar M, Binupriya AR, Vijaraghavan K, Yun S. “Two and three parameter ısothermal modeling for liquid-phase sorption of procion blue h-b by ınactive mycelial biomass of panus fulvus”. Journal of Chemistry Technology and Botechnology, 82, 389-398, 2007.
26. Hamdaoui Q, Naffrechoux E. “Modelling of adsorption ısotherms of phenol and chlorophenols onto granular activated carbon; Part I. Two-parameter models and equations allowing determinations of thermodynamic parameters”. Journal of Hazardous Materials, 147(1-2), 381-394, 2007.
27. Donat R, Akdogan A, Erdem E, Çetişli H. “Thermodynamics of Pb2+ and Ni2+ adsorption onto natural bentonite from aqueous solutions”. Journal of Colloid and Interface Science, 286(1), 43-52, 2005.