TY - JOUR
T1 - Enhancing Free Cyanide Photocatalytic Oxidation by rGO/TiO2 P25 Composites
AU - Albiter, Elim
AU - Barrera-Andrade, Jose M.
AU - Calzada, Lina A.
AU - García-Valdés, Jesús
AU - Valenzuela, Miguel A.
AU - Rojas-García, Elizabeth
N1 - Publisher Copyright:
© 2022 by the authors.
PY - 2022/8
Y1 - 2022/8
N2 - Graphene-TiO2 composites have been investigated in various photocatalytic reactions showing successful synergy compared to pristine TiO2. In the present work, graphene oxide (GO) was synthesized by the Hummers method and then reduced graphene oxide-TiO2 composites (rGO/TiO2) were obtained by an in situ GO photoreduction route. X-ray diffraction, FTIR, Raman, UV–vis DRS, and photoluminescence were the main characterization techniques. The obtained composites containing 1 and 3 wt.% rGO were evaluated in the cyanide (50 mg/L) oxidation and Au-cyanide complex (300 mg/L) degradation under UV-A light. The composites showed higher photocatalytic activity than TiO2, mainly with the 1% rGO content. Cyanate and gold nanoparticles, deposited on the photocatalyst’s surface, were the main byproducts during the photocatalyst assessment. The improved photocatalytic activity of the composites was attributed to a higher rate of electron transfer and a lower rate of charge recombination due to the chemical interaction of rGO with TiO2.
AB - Graphene-TiO2 composites have been investigated in various photocatalytic reactions showing successful synergy compared to pristine TiO2. In the present work, graphene oxide (GO) was synthesized by the Hummers method and then reduced graphene oxide-TiO2 composites (rGO/TiO2) were obtained by an in situ GO photoreduction route. X-ray diffraction, FTIR, Raman, UV–vis DRS, and photoluminescence were the main characterization techniques. The obtained composites containing 1 and 3 wt.% rGO were evaluated in the cyanide (50 mg/L) oxidation and Au-cyanide complex (300 mg/L) degradation under UV-A light. The composites showed higher photocatalytic activity than TiO2, mainly with the 1% rGO content. Cyanate and gold nanoparticles, deposited on the photocatalyst’s surface, were the main byproducts during the photocatalyst assessment. The improved photocatalytic activity of the composites was attributed to a higher rate of electron transfer and a lower rate of charge recombination due to the chemical interaction of rGO with TiO2.
KW - Au–cyanide complex
KW - FTIR
KW - Raman
KW - free cyanide
KW - graphene-TiO composites
KW - photocatalytic oxidation
KW - photoluminescence
UR - http://www.scopus.com/inward/record.url?scp=85137141767&partnerID=8YFLogxK
U2 - 10.3390/ma15155284
DO - 10.3390/ma15155284
M3 - Artículo
C2 - 35955219
AN - SCOPUS:85137141767
SN - 1996-1944
VL - 15
JO - Materials
JF - Materials
IS - 15
M1 - 5284
ER -