A novel biomass coated Ag–TiO2 composite as a photoanode for enhanced photocurrent in dyesensitized solar cells
a mixture of glucose (3g), PVP (1 g) and deionized water (50 ml) was adjusted to pH =11 with 1 M NaOH and stirred in a water bath maintained at 70uC. The resultant TiO2 and AgNO3 suspension was added to the
glucose solution drop-wise over a 2 h reaction period. 2 g of TiO2 powder in an aqueous solution of AgNO3 (2 M, 125 ml) was completely mixed with 100 mL of H2O to form the 1.3 wt% Ag photo-deposited on TiO2. The suspension was illuminated by a Hg lamp (125 W) for 30 min and the precipitate which formed was filtered, washed with deionized water and dried at 80 uC for 24 h.
Natural Light Source Assisted Synthesis of Self-decorated Ag/TiO2 Nanoparticles for Enhanced Photocatalytic Degradation of Fluorescein Dye
P-25 (Degussa) TiO2 nanoparticles with a particle size of ~27 nm were used in all experiments. A freshly prepared 1 M aqueous AgNO3 solution was wrapped with alumina paper to protect it from sunlight. A suspension of TiO2 (0.05% wt) was aged for 30 min in an ultrasonic bath to which the required quantity of a silver nitrate (AgNO3 (99.99%), Aldrich) solution was added. An excess (5 g) of the 1 M aqueous AgNO3 solution was mixed with 3g of the 0.05% TiO2 suspension in 100 g of methanol, an organic solvent. After mixing in an ultrasonic water bath for 5 min, the mixed solution was continuously stirred at room temperature for 3 h using a magnetic stir bar at 300 rpm. During the reaction, the white colored TiO2 nanoparticles became gray over time. At the end of the 3 h reaction time, the dark gray Ag-decorated TiO2 nanoparticles were isolated by filtration. The Ag/TiO2 photocatalyst were washed with excess methanol followed by double distilled (DD)
water to remove excess reactant ions and other dissolved impurities.
Annealed at 100 200 300