A comparative study of electrocoagulation and coagulation of aqueous suspensions of kaolinite powders

2010-04-15
Kilic, Mehtap Guelsuen
Hoşten, Çetin
Removal of kaolinite particles from their synthetically prepared suspensions was studied by electrocoagulation and coagulation to investigate the effect of such operating parameters as initial pH, coagulant dosage, applied voltage, current density, and time. Coagulation was more effective in a wider pH range (pH 5-8) than electrocoagulation which yielded optimum effectiveness in a relatively narrower pH range around 9, where, in both methods, these pH values corresponded to near-zero zeta potentials of kaolinite particles. The mechanism for both coagulation methods was aggregation through charge neutralization and/or enmeshment in aluminum hydroxide precipitates. The kinetics of electrocoagulation was very fast (< 10 min) in approaching a residual turbidity, which could be modeled with a second-order rate equation.
JOURNAL OF HAZARDOUS MATERIALS

Suggestions

A parametric comparative study of electrocoagulation and coagulation using ultrafine quartz suspensions
Kilic, Mehtap Guelsuen; Hosten, Cetin; Demirci, Şahinde (2009-11-15)
This paper attempts to compare electrocoagulation using aluminum anodes and stainless steel cathodes with conventional coagulation by aluminum sulfate dosing on aqueous suspensions of ultrafine quartz. Several key parameters affecting the efficiency of electrocoagulation and coagulation were investigated with laboratory scale experiments in search of optimal parameter values. Optimal values of the parameters were determined on the basis of the efficiency of turbidity removal from ultrafine quartz suspension...
A THERMODYNAMIC STUDY OF THE SYSTEM MGCL2-NACL-CACL2
Karakaya, İshak (1986-10-01)
The reversible EMF for the formation of MgCl2 in fused salts containing NaCl and CaCl2 was studied with a view to furthering the understanding of electrolytes of use in industrial magnesium electrolysis. Measurements were carried out in a cell with pure chlorine gas and Mg-Bi alloy as active electrode materials. The data were used to infer the Gibbs energy of mixing, the enthalpy of mixing and the entropy of mixing. These properties were used with other data to construct the liquidus surface of the ternary ...
The effect of dissolved species on hydrophobic aggregation of fluorite
Hicyilmaz, C; Bilgen, S; Ozbas, KE (1997-03-10)
The hydrophobic aggregation of fluorite in the presence of Fe3+, Al3+, F- Ca2+, Mg2+ and Ba2+ ions was studied. Electrokinetic potentials were measured to interpret the effect of these ions on aggregation.
A theoretical study on coenzyme Q(10) and its reduced form. AM1 treatment
Türker, Burhan Lemi (2000-01-01)
Coenzyme Q(10) (CoQ(10)) and its reduced form, ubiquinol (CoQ(10)H(2)) were subjected to semiempirical quantum chemical treatment at the level of AM1-RHF type calculations. Both of the structures are stable having negative total and binding energies and exothermic heats of formation. The frontier molecular orbital characteristics, electrostatic contour diagrams and charge distributions of these structures were presented.
A quantum chemical study of nitric oxide reduction by ammonia (SCR reaction) on V2O5 catalyst surface
Soyer, Sezen; Uzun, Alper; Senkan, Selim; Önal, Işık (2006-12-15)
The reaction mechanism for the selective catalytic reduction (SCR) of nitric oxide by ammonia on (010) V2O5 surface represented by a V2O9H8 cluster was simulated by means of density functional theory (DFT) calculations performed at B3LYP/6-31G** level. The computations indicated that SCR reaction consisted of three main parts. For the first part, ammonia activation on V2O5 was investigated. Ammonia was adsorbed on Bronsted acidic V-OH site as NH4+ species by a non-activated process with an exothermic relati...
Citation Formats
M. G. Kilic and Ç. Hoşten, “A comparative study of electrocoagulation and coagulation of aqueous suspensions of kaolinite powders,” JOURNAL OF HAZARDOUS MATERIALS, pp. 735–740, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/57170.