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104 FLORICA IMRE-LUCACI, SORIN-AUREL DORNEANU, PETRU ILEA • The evolution in time of the currents recorded in potentiostatic mode encouraged us to also test RCu in galvanostatic mode; • The galvanostatic tests show us that increased volume flow rates and/or electrolyse time are required to attain the MAC. The optimisation of galvanostatic operating parameters involves additional experiments. These promising obtained results prove the feasibility of copper removal from diluted solutions simulating wastewaters. The validation of the obtained results requires additional measurements at scaling-up level, using pilot installation and real wastewaters samples. EXPERIMENTAL SECTION Reagents The simulated solutions were prepared starting from analytical grade reagents (CuSO4, NaCl and Na2SO4, all from Chimopar, Romania) and doubledistilled water. The tested solution contained 10 mg/L Cu 2+ and different concentrations of NaCl or Na2SO4. Experimental setups A Plexiglas home made electrochemical reactor (ER) previously described [2], a Reglo-Digital peristaltic pump (Ismatec, Switzerland) and a HP72 potentiostat (Wenking, Germany) were used for RCu tests. A parallelepiped (L x W x H = 45 mm x 25mm x 25 mm) of 100 ppi RVC was used as working electrode. Four graphite cylindrical bars (Ф = 10 mm, L = 25 mm) were used as counter electrodes. Two Ag/AgCl/KClSAT reference electrodes (RE) were used to record the cathode’s and anode’s potentials. The LabView 6.1 software and a PCI 6024 E data acquisition board (National Instruments, USA) were used for process control. The AAS measurements of Cu concentration in the electrolyte samples were performed with an Avanta PM Spectrometer (GBC, Australia). ACKNOWLEDGEMENTS The financial support within the CNCSIS Project no. 495 / 2464 / 2009 is gratefully acknowledged. REFERENCES 1. A. Al.-Shammari, S.U. Rahman, D.-T. Chin, J. Appl. Electrochem., 2004, 34, 447. 2. S.A. Dorneanu, F.-L. Beke, P. Ilea, Studia Univ. Babes-Bolyai, Chemia, 2008, 53, 97.
OPTIMISATION OF COPPER REMOVAL FROM DILUTED SOLUTIONS 3. Romanian Government Decision no. 352 from 11.05.2005. 4. P. Ilea, S.A. Dorneanu, Tratarea apelor reziduale cu conţinut de ioni de metale grele, A X Ediţie a Zilelor academice timişene, 2007. 5. C. Ponce de Leoon, D. Pletcher, Electrochim. Acta, 1996, 41, 533. 6. J.Y. Choi, D.S. Kim, J. Hazard. Mater., 2003, B99, 147. 7. A. Dutra, A. Espiinola, P. Borges, Minerals Eng., 2000, 13, 1139. 8. E. Munoz, S. Palmero, M. A. Garcia-Garcia, Electroanalysis, 2000, 10, 12. 9. G.W. Reade, A.H. Nahle, P. Bond, J.M. Friedrich, F.C. Walsh, J. Chem. Techn. Biotech., 2004, 79, 935. 10. G. W. Reade, P. Bond, C. Ponce de Leon, F.C. Walsh, J. Chem. Techn. Biotech., 2004, 79, 946. 11. F.A. Lemos, L.G.S. Sobral, A.J.B. Dutra, Minerals Eng., 2006, 19, 388. 12. S.C. Varvara, L.M. Muresan, Metode electrochimice de investigare a electrodepunerii metalelor, Casa Cărţii de Ştiinţă, Cluj-Napoca, 2008, 31. 105
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R /(mol m -2 s -1 ) 0.06 0.05 0.04
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ANA-MARIA CORMOS, JOZSEF GASPAR, AN
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Studia Universitatis Babes-Bolyai C
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6 PROFESSOR IOAN BÂLDEA AT HIS 70
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MARCELA ACHIM, DANA MUNTEAN, LAURIA
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STUDIA UNIVERSITATIS BABEŞ-BOLYAI,
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STUDIES ON WO3 THIN FILMS PREPARED
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PREPARATION AND CHARACTERIZATION OF
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32 C. CĂŢĂNAŞ, M. MOGOŞ, D. HO
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34 C. CĂŢĂNAŞ, M. MOGOŞ, D. HO
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C. CĂŢĂNAŞ, M. MOGOŞ, D. HORVA
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38 ANA-MARIA CORMOS, JOZSEF GASPAR,
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ANA-MARIA CORMOS, JOZSEF GASPAR, AN
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50 EUGEN DARVASI, LADISLAU KÉKEDY-
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158 D. MIHU, L. VLASE, S. IMRE, C.
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160 D. MIHU, L. VLASE, S. IMRE, C.
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162 A. PETER, M. BAIA, F. TODERAS,
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164 (a) V relative [%] (c) V relati
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BIOSORPTION OF PHENOL FROM AQUEOUS
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186 ANDREI ROTARU, MIHAI GOŞA, EUG
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ln(τ i / s) OCTAVIAN STAICU, VALEN
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204 MARIA ŞTEFAN, IOAN BÂLDEA, RO
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EXPERIMENTAL SECTION 210 MARIA ŞTE
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EQUILIBRIUM STUDY ON ADSORPTION PRO
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STRATEGIES OF HEAVY METAL UPTAKE BY
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E / mV vs. SCE POTASSIUM-SELECTIVE
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PHARMACOKINETIC INTERACTION BETWEEN
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