INSTITUTUL NAÅ¢IONAL DE CERCETARE-DEZVOLTARE - ICECHIM

4. Protection and environmental engineering - PSTUDY OF ADSORPTION KINETICS AND ZETA POTENTIAL OFPHOSPHATE AND NITRATE IONS ON A CELULOSIC MEMBRANEG.H. NECHIFOR 1 , PASCU D. E. 2 , PASCU (NEAGU) M. 2,3 , TRAISTARU G. A.1 Departament Chemistry Ingineering , Politehnica University of Bucharest, Faculty ofApplied Chemistry and Material Science; 1-5 Polizu St, 11061Bucharest2 Department Chemistry Ingineering , Politehnica University of Bucharest, Faculty of AppliedChemistry and Material Science; 1-5 Polizu St, 11061Bucharest3 SC HOFIGAL S.A. Analytical Research Department, 2 Intr. Serelor, Bucharest-4, 042124,RomaniaIn the context of process industries, membrane cleaning is one of the most important concernsfrom both economical and scientific points of view. The characterisation of membrane surfaceby using zeta potential technique provides a more appropriate tool to study the cleaningperformance and membrane integrity. The use of zeta potential technique to characterize thecleaning effect on membrane surfaces has very little precedence in literature. The effects ofconcentration, temperature and pH on membrane zeta potential were also investigated. Thetemperature was not found to have any significant effect on membrane zeta potential;however, the effect of pH and concentration of ions had pronounced effects on the surfacecharge and zeta potential.Also, we studied the kinetics adsorption of phosphate and nitrate ions on a cellulosicmembrane. Adsorption studies were performed according to two parameters: pH andconcentration solutions. Since the pseudo first order kinetics satisfactorily described theadsorption process Arrhenius equation was used to calculate apparent activationenergy. Langmuir equation characterized very well the experimental data for both nitrate ionand phosphate ion. Maximum adsorption capacity for nitrate ion was higher compared to thatof phosphate ion which means that cellulose membrane has a much higher adsorptioncapacity for nitrate ion than phosphate ion. The result of this study demonstrated that thepotential use of cellulosic membranes for nitrate and phosphate ions removal fromwastewater.References1. Afonso, M., Geraldes, V., Rosa, M., and De Pinho, M., "Nanofiltration Removal of Chlorinated OrganicCompounds from Alkaline Bleaching Effluents in a Pulp and Paper Plant", Water Research, 26, 1639 (1992);2. Zhaoan Chen, Maicun Deng, Yong Chen, Gaohong He, Ming Wu, Junde Wang, Preparation and performanceof cellulose acetate/ polyethyleneimine blend microfiltration membranes and their applications, Journal ofMembrane Science 235 (2004) 73–86;3. Mustafa Soylak, Nilgun Develioglu Erdo and Latif Elci, Membrane Filtration of Iron(III), Copper(II) andLead(II) Ions as1-(2-pyridylazo) 2-naphtol (PAN) for their Preconcentration and Atomic AbsorptionDeterminations, Journal of the Chinese Chemical Society, 2004, 51, 703-706;