HIGH EFFICIENT VISIBLE-LIGHT ACTIVATED PHOTO CATALYTIC SEMICONDUCTOR SnO2/Sn3O4 HETEROSTRUCTURE IN DIRECT BLUE 71 (DB71) DEGRADATION

Abstract

The SnO2/Sn3O4 were successfully prepared using a one-step hydrothermal method and exhibit the heterostructure formation. The heterostructure formation facilitates the enhancing of visible-light photoresponse of SnO2 which well known as the UV-light activated semiconductor. The heterostructure formation also exhibits high efficient photocatalytic performance by completely degrading 10 ppm of DB71 in 120 minutes after adding 50 mg of prepared-Tin oxide with a kinetic rate constant of 4.636 x 10 -2 min -1 . The kinetic constant rate of prepared-Tin oxide has 2.5 and 3 times faster compared to the kinetic constant rates of SnO2 and Sn3O4, respectively. The high efficient photocatalytic degradation was generated by the improvement of carrier mobilities through manipulating band alignment between SnO2 and Sn3O4 and prevented the recombination of photogenerated hole-electron which commonly generated in the intrinsic semiconductor. Heterostructure SnO2/Sn3O4 was not only forming high-efficiency photocatalytic degradation but also exhibiting blue shifting phenomenon. The UV-Vis adsorption response approaches were used to investigate and propose the photocatalytic degradation mechanism. After 120 minutes, there were only benzene adsorption peaks detected indicating the mineralization of DB71 dyes.

Preparation of S-Doped Tio2 via Sol-Gel/ Hydrothermal Method and Its Activity as Photodegradation of Rb05

“…The photoactivity of S-doped TiO control the temperature. The treatment was performed previously 15 . The obtained aliquots final concentration of imitated wastewater after treatment.…”

Flat-Band Potential Determination and Catalytical Properties of Sn3O4/SnO2 Heterostructures in the Photo-Electrooxidation of Small Organic Molecules under Ultraviolet (370 nm) and Blue (450 nm) Light

“…Despite this, the main disadvantage for the use of Sn 3 O 4 is that the potential of the valence band is not high enough for photo-oxidation reactions. To increase the efficiency of charge separation, composites of Sn 3 O 4 with electrically conductive materials based on graphene [10,35], graphene oxide [14,32], Ni foam [19], Sn [20] and heterostructures based on C 3 N 4 [17], SnO [36,37], SnO 2 [22,24,[38][39][40] and Si nanowires [41] are being studied intensively. Heterostructures based on high valence band oxidation potential of SnO 2 with an absorbance in the visible region of Sn 3 O 4 can increase the efficiency of photocatalytic reactions.…”