PDF file - Facultatea de Chimie şi Inginerie Chimică

More documents

Recommendations

Info

GROWTH AND CHARACTERISATION OF ZINC-CADMIUM SULPHIDE THIN FILMS … 5. Z. Khefaca, M. Mnari, M. Dachraoui, Physical&Chemical News, 2003, 14(1), 77. 6. T. B. Nasr, N. Kamoun, C. Guasch, Applied Surface Science, 2008, 254, 5039. 7. R.S. Mane, C.D. Lochande, Materials Chemistry Physics, 2000, 65, 1. 8. L.X. Shao, K.H. Chang, H.L.Hwang, Applied Surface Science, 2003, 212-213, 305. 9. C.T. Hsu, Thin Solid Films, 1998, 335, 284. 10. M. P. Valkonen, S. Lindroos, T. Kanniainen, M. Leskalä, U. Tapper, E. Kauppinen, Applied Surface Science, 1997, 120, 58. 11. S.Yano, R.Schroeder, B.Ullrich, H. Sakai, Thin Solid Films, 2003, 423, 273. 12. L. Zhou, Y. Xue, J. Li, Journal of Environmental Sciences Supplement, 2009, S76. 13. M. Ichimura, T. Furukawa, K. Shirai, F. Goto, Materials Letters, 1997, 33, 51. 14. J. M. Dona, J. Herrero, Thin Solid Films, 1995, 268, 5. 15. I. O. Oladeji, L. Chow, Thin Solid Films , 2005, 474, 77. 16. M. Lădar, E.J. Popovici, I. Baldea, R. Grecu, E. Indrea, Journal of Alloys and Compounds, 2007, 434-435, 697. 17. D. S. Boyle, O. Robbe, D. P. Halliday, M. R. Heinrich, A. Bayer, P. O’Brien, D. J. Otway, M. D. G. Potter, Journal of Materials Chemistry, 2000,10, 2439. 18. M. Lădar, E- J. Popovici, L Pascu, R. Grecu, I.C. Popescu, E. Indrea, Studia Universitatis Babes-Bolyai, seria Physica, 2003, 2, XLVIII, 469. 19. R. Grecu, E. J. Popovici, M. Lădar, L. Silaghi-Dumitrescu, E. Indrea, Studia Universitatis Babes-Bolyai, seria Physica, 2003, 2, XLVIII, 472. 20. R. Grecu, E. J. Popovici, M. Lǎdar, L. Pascu, E. Indrea, Journal of Optoelectronics and Advanced Materials, 2004, 6, 127. 211
STUDIA UNIVERSITATIS BABEŞ-BOLYAI, CHEMIA, LIV, 3, 2009 EQUILIBRIUM STUDY ON ADSORPTION PROCESSES OF 4-NITROPHENOL AND 2, 6-DINITROPHENOL ONTO GRANULAR ACTIVATED CARBON MIHAELA-CLAUDIA TERTIŞ a , FLORINA IONESCU a , MARIA JITARU a ABSTRACT. Adsorption of 4-nitrophenol and 2, 6-dinitrophenol onto granular activated carbon has been studied. Adsorption experiments were carried out in a batch system and were followed by UV-Visible spectroscopy over a period of 120 min. Adsorption isotherms were derived at 25 o C and the isotherm data were treated according to Langmuir, Freundlich and Tempkin isotherm equations. The fitting of experimental data was tested and the parameters of these equations were determined. Based on the correlation coefficients both Langmuir and Freundlich models are suitable for the study (the squares of correlation coefficients are all > 0.97). Based on the values of normalized percent deviation P, the Freundlich model is suitable for 4-NP and the Langmuir model is suitable 2,6-DNP adsorption onto granular activated carbon type NORIT GAC 1240W (value of P less than 5). The calculated adsorption capacity values (qmax) are: 277.77 mg g -1 for 4-NP, respective 41.15 mg g -1 for 2, 6-DNP. Keywords: adsorption, nitrophenols, isotherm, activated carbon INTRODUCTION Among the environmentally concerned substances, nitrophenols represent one of the most common groups of highly toxic water pollutants. The monosubstituted 4-nitrophenol is found in wastewaters discharged from various industrial activities such as pulp and paper industries, textile mills, steel plants, oil refineries, etc. [1]. This compound is also associated with agricultural activities as an intermediate for the production of pesticides, herbicides and insecticides [2]. Phenol and some of its derivatives are considered priority pollutants with a permissible limit of 0.1 mg mL -1 in wastewater [3-6] and must be removed from industrial effluents before discharge into environment. Particular attention has been given to 4-nitrophenol which presents some undesired effects and has a permissible limit of 0.06 mg mL -1 [3, 6]. a Research Centre LAF-INT-ECOL, Faculty of Chemistry and Chemical Engineering, “Babes- Bolyai” University, 11 Arany Janos Street, 400028
Page 1 and 2:
R /(mol m -2 s -1 ) 0.06 0.05 0.04
Page 3 and 4:
ANA-MARIA CORMOS, JOZSEF GASPAR, AN
Page 5 and 6:
Studia Universitatis Babes-Bolyai C
Page 7 and 8:
6 PROFESSOR IOAN BÂLDEA AT HIS 70
Page 9 and 10:
MARCELA ACHIM, DANA MUNTEAN, LAURIA
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
STUDIA UNIVERSITATIS BABEŞ-BOLYAI,
Page 17 and 18:
STUDIES ON WO3 THIN FILMS PREPARED
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
PREPARATION AND CHARACTERIZATION OF
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
32 C. CĂŢĂNAŞ, M. MOGOŞ, D. HO
Page 33 and 34:
34 C. CĂŢĂNAŞ, M. MOGOŞ, D. HO
Page 35 and 36:
C. CĂŢĂNAŞ, M. MOGOŞ, D. HORVA
Page 37 and 38:
38 ANA-MARIA CORMOS, JOZSEF GASPAR,
Page 39 and 40:
ANA-MARIA CORMOS, JOZSEF GASPAR, AN
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
50 EUGEN DARVASI, LADISLAU KÉKEDY-
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
MATHEMATICAL MODELING FOR THE CRYST
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
STUDY OF THE CHROMATOGRAPHIC RETENT
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
LOWER RIM SILYL SUBSTITUTED CALIX[8
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
THE INTERACTION OF SILVER NANOPARTI
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
OPTIMISATION OF COPPER REMOVAL FROM
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
MELINDA-HAYDEE KOVACS, DUMITRU RIST
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
IRON DOPED CARBON AEROGEL AS CATALY
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
128 ANDRADA MĂICĂNEANU, HOREA BED
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
ANDRADA MĂICĂNEANU, HOREA BEDELEA
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
CRISTINA MIHALI, GABRIELA OPREA, EL
Page 139 and 140:
144 CRISTINA MIHALI, GABRIELA OPREA
Page 141 and 142:
146 Interfering ion, J - I - DBS -
Page 143 and 144:
CONCLUSIONS 148 CRISTINA MIHALI, GA
Page 145 and 146:
150 CRISTINA MIHALI, GABRIELA OPREA
Page 147 and 148:
152 D. MIHU, L. VLASE, S. IMRE, C.
Page 149 and 150:
154 Intens. x105 1.5 1.0 0.5 0.0 x1
Page 151 and 152:
D. MIHU, L. VLASE, S. IMRE, C. M. M
Page 153 and 154: 158 D. MIHU, L. VLASE, S. IMRE, C.
Page 155 and 156: 160 D. MIHU, L. VLASE, S. IMRE, C.
Page 157 and 158: 162 A. PETER, M. BAIA, F. TODERAS,
Page 159 and 160: 164 (a) V relative [%] (c) V relati
Page 161 and 162: A. PETER, M. BAIA, F. TODERAS, M. L
Page 167 and 168: STUDIA UNIVERSITATIS BABEŞ-BOLYAI,
Page 169 and 170: BIOSORPTION OF PHENOL FROM AQUEOUS
Page 179 and 180: 186 ANDREI ROTARU, MIHAI GOŞA, EUG
Page 183 and 184: ANDREI ROTARU, MIHAI GOŞA, EUGEN S
Page 187 and 188: 194 OCTAVIAN STAICU, VALENTIN MUNTE
Page 189 and 190: ln(τ i / s) OCTAVIAN STAICU, VALEN
Page 197 and 198: 204 MARIA ŞTEFAN, IOAN BÂLDEA, RO
Page 203: EXPERIMENTAL SECTION 210 MARIA ŞTE
Page 207 and 208: EQUILIBRIUM STUDY ON ADSORPTION PRO
Page 217 and 218: STRATEGIES OF HEAVY METAL UPTAKE BY
Page 229 and 230: CORROSION INHIBITION OF BRONZE BY A
Page 241 and 242: E / mV vs. SCE POTASSIUM-SELECTIVE
Page 243 and 244: POTASSIUM-SELECTIVE ELECTRODE BASED
Page 245 and 246: POTASSIUM-SELECTIVE ELECTRODE BASED
Page 247 and 248: 256 CODRUTA VARODI, DELIA GLIGOR, L
Page 249 and 250: CODRUTA VARODI, DELIA GLIGOR, LEVEN
Page 255 and 256:
Page 257 and 258:
PHARMACOKINETIC INTERACTION BETWEEN
Page 259 and 260:
Page 261:
show all

PDF file - Facultatea de Chimie şi Inginerie Chimică

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?