Author/Authors :
Chergui، Ahmed نويسنده Laboratory of Electrochemistry-Corrosion, Metallurgy and Inorganic Chemistry, Faculty of Chemistry, Algiers, Algeria , , Madjene، Farid نويسنده Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry, Algiers, Algeria , , Trari، Mohamed نويسنده Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry, Algiers, Algeria , , Khouider، Ali نويسنده Laboratory of Electrochemistry-Corrosion, Metallurgy and Inorganic Chemistry, Faculty of Chemistry, Algiers, Algeria ,
Abstract :
Ni2+ is a highly toxic above 0.07 mg/L and its removal is of high significance. The biosorption of Ni2+ onto medlar
male flowers (MMF) was studied in relation with the physical parameters like pH, contact time, biosorbent
dosage, Ni2+ concentration and temperature. The interaction biosorbent-Ni2+ was examined by the FTIR
technique. The equilibrium was achieved within 40 min and the data were well fitted by the Langmuir and
Redlich-Peterson (R-P) models. The maximum Ni2+ uptake capacity was 17.073 mg/g at 25°C and the Ni2+
removal follows a pseudo-second order kinetic with activation energy of 13.3 kJ/mol. The thermodynamic
parameters: ?S°, ?H° and ?G° showed that the biosorption was spontaneous and endothermic. MMF was
used as a post treatment technique and the biosorption was coupled with the visible light driven Ni2+ reduction
over the spinel ZnMn2O4. The effect of the pH, ZnMn2O4 loading and light intensity on the photoactivity was
investigated. 77.5% of Ni2+ was reduced after ~140 min under optimal conditions. The Ni2+ removal reached
a rate conversion of 96% of with the coupled system biosorption/photocatalysis is very promising for the
water treatment.
