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182 T. PERNYESZI, K. HONFI, B. BOROS, K. TÁLOS, F. KILÁR, C. MAJDIK covered to prevent photodegradation. All adsorption experiments were conducted in the dark to avoid formation of photodegradation products. Tubes were agitated on a shaker at 150 rpm and a constant temperature (22.5 ± 2 °C). Samples were taken at given time intervals, and then centrifuged at 10 000 rpm for 10 min. The supernatant was used for analysis of the residual phenol. The amount of phenol adsorbed at equilibrium, q (mg/g), was obtained as follows: ( c0 − c V q = e) (1) m where, c0 and ce are the initial and equilibrium liquid phase concentrations (mg/L) V is the volume of the solution (L) and m is the weight of the dry biomass used (g). Analysis Phenol concentration in supernatant was determined by HPLC. The HPLC system containes a liquid chromatograph (LC-10 ADVP, Shimadzu), a micro vacuum degasser (DGU-14 A, Shimadzu), a system controller (SCL-10 AVP, Shimadzu), a diode array detector (SPD-M 10 AVP, Shimadzu) and an injector (7725i, Rheodyne). The LCMS solution software was applied on the HPLC system. The measurements were performed on the UV/VIS-photo diode array detector with detection at 270 nm. Chromatographic separations were performed on a Phenomenex C18 column (150×4.6 mm i.d., 5 μm, Phenomenex, USA). For separations the mobile phase A, water and mobile phase B, methanol and gradient system (0.03 min 42 % B eluent, 8.00 min 60 % B eluent, 8.10 min 42 % B eluent and 11.00 min 42 % B eluent) were used. Operating conditions were as follows: flow rate 1.0 mL/min, column temperature ambient and injection volumes 20 μL of the standard and samples. Calibration curve of the standard was made by diluting stock solution of standard in water to yield 10-100 mg/L. ACKNOWLEDGEMENT Timea Pernyeszi, Ferenc Kilár and Cornelia Majdik gratefully acknowledge support for this research from the Hungarian-Romanian Intergovernmentals & Cooperation Programme between University of Pécs and University of Babes- Bolyai for 2008-2009.
BIOSORPTION OF PHENOL FROM AQUEOUS SOLUTIONS BY FUNGAL BIOMASS ... REFERENCES 1. M. Iqbal, A. Saeed, Process Biochemistry, 2007, 42, 1160. 2. N. Calace, E. Nardi, B.M. Petronio, M. Pietronio, M. Pietroletti, Environ. Pollut., 2002, 118(3), 315. 3. G. Bülbül, Z. Aksu, Turkish J. Eng. Envir. Sci., 1997, 21, 175. 4. A. Denizli, N. Cihangir, A.Y. Rad, M. Taner, G. Alsancak, Process Biochemistry, 2004, 39, 2025. 5. H. Volesky, Z.R. Holan, Biotechnol. Prog., 1995, 11, 239. 6. Z. Aksu, J. Yener, Process Biochem., 1998, 33, 649. 7. Z. Ning, K.J. Kennedy, L. Fernandes, Water Res., 1996, 30(9), 2039. 8. I.R. Rao, T. Viraraghavan, Bioresour. Technol., 2002, 85(2), 165. 9. J.L. Wang, Y. Qian, N. Horan, E. Stentiford, Bioresourcs Technol., 2002, 65, 165. 10. M. Tsezos, J.P. Bell., Water Res. 1989, 23, 561. 11. O. Yesilda, K. Fiskin, E. Yesilda, Envir. Techn., 1995, 16, 95. 12. J. Wu, H-Q. Yu, Process Biochemistry, 2006, 41, 44. 13. J. Wu, H-Q. Yu, Journal of Haradous Materials B., 2006, 137, 498. 14. C.G. Silva, J.L.Faria, J. of Molecular Catalysis, 2009, 305, 147. 15. P. Benoit, E. Barriuso, R. Calvet, Chemosphere, 1998, 37(7), 1271. 16. S. Lagergren, Zur theorie der sogenannten adsorption geloster stoffe: Kungliga Svenska vetenskapsakademiens, Handlingar 1998, 24, 1. 17. D. Batabyal, A. Sabu, S.K. Chaudhuri, Separations Technol., 1995, 5(4), 179. 18. Z. Aksu, S. Tezer, Process Biochemistry, 2000, 36(5), 431. 19. G. Mckay, Y.S. Ho, Process Biochem., 1999, 34, 451. 20. T.K. Kirk, E. Schultz,cW.J. Connors, Arch Microbiol., 1978, 117, 227. 21. B. Antizar-Ladislao, N.J. Galil, Water Res., 2004, 38(2), 267. 183
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ANA-MARIA CORMOS, JOZSEF GASPAR, AN
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Studia Universitatis Babes-Bolyai C
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MARCELA ACHIM, DANA MUNTEAN, LAURIA
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STUDIES ON WO3 THIN FILMS PREPARED
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