Kinetic study of 2-nitrophenol photodegradation on Al-pillared montmorillonite doped with copper.

This work concerns the kinetic study of heterogeneous photocatalytic processes on copper adsorbed on aluminium-pillared montmorillonite. Photomineralization of 2-nitrophenol in aqueous medium was investigated as a function of the following experimental parameters: initial concentration of pollutant, light intensity, initial concentration of hydroperoxide, catalyst concentration, pH and temperature. The kinetic expression obtained can be described by the formula: V(NP) = k(0)exp(-Ea/RT)I(beta) x (K(NP)[NP]K(H2O2)[H2O2]/ [1+K(NP)[NP]0)(1+K(H2O2)[H2O2])] The apparent overall activation energy obtained for 2-nitrophenol was 28 kJ mol(-1). By fitting the above equation with the experimental data and values for beta (1.94), K(H2O2) (32.291 mol(-1)) and K(NP) (47.25 x 10(2)l mol(-1)), the kinetic equation can predict the concentration of 2-nitrophenol during the entire degradation process at pH 5 and a catalyst concentration of 0.5 g l(-1).

[1]  C. Minero.  Kinetic analysis of photoinduced reactions at the water semiconductor interface , 1999 .

[2]  G. Marcì,et al.  Preparation and characterisation of TiO2 (anatase) supported on TiO2 (rutile) catalysts employed for 4-nitrophenol photodegradation in aqueous medium and comparison with TiO2 (anatase) supported on Al2O3 , 1999 .

[3]  Dingwang Chen,et al.  Photodegradation kinetics of 4-nitrophenol in TiO2 suspension , 1998 .

[4]  N. Frini-Srasra,et al.  Catalytic wet peroxide oxidation (CWPO) of phenol over mixed (AlCu)-pillared clays , 1998 .

[5]  J. Lambert,et al.  Optimisation of the preparation of an Al-pillared clay: thermal stability and surface acidity , 1997 .

[6]  J. P. Percherancier,et al.  Semiconductor-sensitized photodegradation of pesticides in water: the case of carbetamide , 1995 .

[7]  K. Tennakone,et al.  Photocatalytic degradation of organic contaminants in water with TiO2 supported on polythene films , 1995 .

[8]  Y. Ku,et al.  The effect of light absorbance on the decomposition of chlorophenols by ultraviolet radiation and u.v./H2O2 processes , 1995 .

[9]  S. Martin,et al.  Environmental Applications of Semiconductor Photocatalysis , 1995 .

[10]  R. H. Davies,et al.  PHOTOMINERALIZATION OF SALICYLIC-ACID - A KINETIC-STUDY , 1994 .

[11]  P. Pichat,et al.  THE DEGRADATION OF NITROBENZENE IN WATER BY PHOTOCATALYSIS OVER TIO2 : KINETICS AND PRODUCTS ; SIMULTANEOUS ELIMINATION OF BENZAMIDE OR PHENOL OR PB2+ CATIONS , 1994 .

[12]  Y. Wada,et al.  TIO2-CATALYZED EXHAUSTIVE PHOTOOXIDATION OF ORGANIC COMPOUNDS IN PERFLUOROTRIBUTYLAMINE , 1994 .

[13]  C. Pulgarin,et al.  Integrated approach useful in the mineralization of nonbiodegradable, toxic p-nitrotoluenesulfoncic acid via photocatalytic-biological processes , 1994 .

[14]  G. Roam,et al.  Factors affecting the photocatalytic degradation of dichlorvos over titanium dioxide supported on glass , 1993 .

[15]  T. Chou,et al.  Kinetics of photodecolorization of methyl orange using titanium dioxide as catalyst , 1993 .

[16]  M. Graetzel,et al.  Beneficial effects of heterogeneous photocatalysis on the biodegradation of anthraquinone sulfonate observed in water treatment , 1993 .

[17]  E. Lipczynska-Kochany,et al.  Degradation of nitrobenzene and nitrophenols by means of advanced oxidation processes in a homogeneous phase: Photolysis in the presence of hydrogen peroxide versus the Fenton reaction☆ , 1992 .

[18]  J. Bolton,et al.  Mechanism of photodegradation of aqueous organic pollutants. 2. Measurement of the primary rate constants for reaction of hydroxyl radicals with benzene and some halobenzenes using an EPR spin-trapping method following the photolysis of hydrogen peroxide , 1992 .

[19]  Pierre Pichat,et al.  Semiconductor-sensitized photodegradation of 4-chlorophenol in water , 1991 .

[20]  L. Palmisano,et al.  Photocatalytic degradation of nitrophenols in aqueous titanium dioxide dispersion , 1991 .

[21]  P. Pichat,et al.  Photodegradation of 2- and 3-chlorophenol in titanium dioxide aqueous suspensions , 1990 .

[22]  J. Baxendale,et al.  The photolysis of hydrogen peroxide at high light intensities , 1957 .