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96 O. HOROVITZ, M. TOMOAIA-COTIŞEL, C. RACZ, GH. TOMOAIA, L.-D. BOBOŞ, A. MOCANU 28. J.-S. Lee, A. K. R. Lytton-Jean, S. J. Hurst, C. A. Mirkin, Nano Letters, 2007, 7, 2112. 29. L. Hadad, N. Perkas, Y. Gofer, J. Calderon-Moreno, A. Hule, A. Gedanken, Journal of Applied Polymer Science, 2007, 104, 1732. 30. S. Li, G.-M. Zhou, D.-C. Yang, D.-N. H.-J. Yu,. X.-J. Peng, N. W. Wu, Spectroscopy and Spectral Analysis, 2007, 27, 711. 31. O. Horovitz, Gh. Tomoaia, A. Mocanu, T. Yupsanis, M. Tomoaia-Cotisel, Gold Bulletin, 2007, 40 (3), 213. 32. O. Horovitz, A. Mocanu, Gh. Tomoaia, L. Boboş, D. Dubert, I. Dăian, T. Yupsanis, M. Tomoaia-Cotisel, Studia Universitatis Babes-Bolyai, Chemia, 2007, 52 (1), 97. 33. I. Petean, Gh. Tomoaia, O. Horovitz, A. Mocanu, M. Tomoaia-Cotisel, Journal of Optoelectronics and Advanced Materials, 2008, 10, 2289. 34. L. Barbu-Tudoran, Gh. Tomoaia, O. Horovitz, A. Mocanu, M. Tomoaia-Cotisel, Journal of Optoelectronics and Advanced Materials, 2008, 10, 2293. 35. A. Mocanu, I. Cernica, Gh. Tomoaia, L. D. Bobos, O. Horovitz, M. Tomoaia-Cotisel, Colloids and Surfaces A, Physical and Engineering Aspects, 2009, 338, 93. 36. W. P. Hall, G. Hartland, R. Van Duyne, H. Petrova, Nanoscape, 2005, 2, 35. 37. G. P. Biewenga, G. R. M. M. Haenen, A. Bast, General Pharmacology: The Vascular System, 1997, 29(3), 315. 38. P. J. Randle, Diabetes / Metabolism Reviews, 1998, 14(4) 263. 39. G. P. Biewenga, G. R. M. M. Haenen, A. Bast, Drug Metabolism Reviews, 1997, 29(4) 1025. 40. L. A. Porter, Jr., D. Ji, S. L. Westcott, M. Graupe, R. S. Czernuszewicz, N. J. Halas, T. R. Lee, Langmuir, 1998, 14, 7378.
STUDIA UNIVERSITATIS BABEŞ-BOLYAI, CHEMIA, LIV, 3, 2009 OPTIMISATION OF COPPER REMOVAL FROM DILUTED SOLUTIONS FLORICA IMRE-LUCACI a , SORIN-AUREL DORNEANU, PETRU ILEA ABSTRACT. An experimental study concerning the copper removal from a simulated wastewater containing 10 ppm of Cu 2+ ions was performed in a continuous flow electrochemical reactor equipped with a rectangular threedimensional (3D) cathode made of reticulated vitreous carbon (RVC) with 100 ppi porosity. The influence of low supporting electrolyte concentrations and of the electrode polarisation potential was investigated. The reactor performance was evaluated considering the residual copper concentration and the specific energy consumption. After 90 min of electrolysis, the copper ion concentration was reduced to less than 0.1 ppm, permitting the discharge of the treated solutions to the drain system. With an operating cell voltage around 1.8 V, specific energy consumptions close to 0.18 kWh per cubic meter of treated wastewater was calculated. Keywords: removal, copper, reticulated vitreous carbon electrode, waste waters INTRODUCTION Wastewaters containing heavy metal ions (HMI), such as cadmium, chromium, copper, gold, lead, nickel, silver, tin and zinc, are generated in large quantities during electroplating, manufacturing of microelectronic parts, mining and processing of photographic materials. For environmental and economic reasons, these toxic metals should be removed from wastewater before discharge [1, 2]. The maximum admitted concentrations (MAC) of heavy metals is strictly regulated in EU, imposing a rigorous control and treatment of wastewaters. These limits are in the domain 0.05 – 1 ppm for HMI [3]. In order to respect the MAC, the removal by cathodic deposition presents a clear, versatile and efficient method. Depending on the heavy metals concentrations, the removal process can be done in different manners. For high concentration (grams per litre), two-dimensional cathodes can be used and the content of heavy metals can be reduced with one order magnitude. The resulting effluent can be reused in the process or it can be introduced in a new stage of chemical or electrochemical decontamination [2]. a Department of Physical Chemistry, “Babes-Bolyai” University, 11 Arany Janos, 400028 Cluj-Napoca, Romania; * fimre@chem.ubbcluj.ro
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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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42 ANA-MARIA CORMOS, JOZSEF GASPAR,
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150 CRISTINA MIHALI, GABRIELA OPREA
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152 D. MIHU, L. VLASE, S. IMRE, C.
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154 Intens. x105 1.5 1.0 0.5 0.0 x1
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D. MIHU, L. VLASE, S. IMRE, C. M. M
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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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A. PETER, M. BAIA, F. TODERAS, M. L
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BIOSORPTION OF PHENOL FROM AQUEOUS
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186 ANDREI ROTARU, MIHAI GOŞA, EUG
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194 OCTAVIAN STAICU, VALENTIN MUNTE
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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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CORROSION INHIBITION OF BRONZE BY A
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E / mV vs. SCE POTASSIUM-SELECTIVE
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POTASSIUM-SELECTIVE ELECTRODE BASED
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POTASSIUM-SELECTIVE ELECTRODE BASED
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256 CODRUTA VARODI, DELIA GLIGOR, L
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CODRUTA VARODI, DELIA GLIGOR, LEVEN
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PHARMACOKINETIC INTERACTION BETWEEN
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