Enhanced photocatalytic activities of TiO2-reduced graphene oxide nanocomposites controlled by Ti O C interfacial chemical bond

2018 ◽  
Vol 99 ◽  
pp. 29-36 ◽  
Author(s):  
Ying Chen ◽  
Hongyan Gao ◽  
Junjie Xiang ◽  
Xinju Dong ◽  
Yan Cao
NANO ◽  
2017 ◽  
Vol 12 (03) ◽  
pp. 1750032 ◽  
Author(s):  
H.-Y. He

Reduced graphene oxide-SnSe (rGO-SnSe) nanohybrids were synthesized with a solution chemical reaction at room temperature. The nanohybrids were characterized by various techniques for their microstructural and photocatalytic activities in photodegradation of alkaline dye malachite green in the water. The effects of rGO/SnSe ratio, initial solution pH, and H2O2 concentration on the photodegradation efficiency were studied. The SnSe nanocrystallines with nanoscale size and narrow bandgap were formed and uniformly adhered on the rGO surface. Raman analysis confirmed the reduction of GO. The experimental results indicated that the nanohybrids showed excellent sunlight-excited photocatalytic activity in degrading malachite green in the water. Significantly, the nanohybrids showed remarkable photo-Fenton-like catalytic activity. The photodegradation rates of the hybrids were greater than that of SnSe nanoparticles, increased with increasing rGO/SnSe ratio, and related to operation parameters. High photocatalytic activities were ascribed to the efficiency interface effect that was confirmed by the calculations of band energy level and photoconductivity. The TOC measurement further verified the photodegradation results. The nanoparticles and nanohybrids also showed excellent reusability.


2018 ◽  
Vol 5 (8) ◽  
pp. 180613 ◽  
Author(s):  
Haijin Liu ◽  
Peiyao Li ◽  
Haokun Bai ◽  
Cuiwei Du ◽  
Dandan Wei ◽  
...  

Anatase TiO 2 with {001} facets is much more active than that with {101} facets, which has been verified via experiments and theoretical calculations. Graphene has garnered much attention since it was initially synthesized, due to its unique properties. In this study, reduced graphene oxide (RGO)/{001} faceted TiO 2 composites were fabricated via a solvothermal method. The composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectrophotometry, photoluminescence and Raman analysis. The results revealed that the graphene oxide was reduced during the preparation process of the {001} faceted TiO 2 , and combined with the surface of {001} TiO 2 . The photocatalytic activities of the composites were evaluated through the degradation of basic violet, under both white light ( λ > 390 nm) and visible light ( λ = 420 nm) irradiation. The results indicated that the photocatalytic activities of the {001} faceted TiO 2 were significantly improved following the incorporation of RGO, particularly under visible light irradiation. Theoretical calculations showed that the band structure of the {001} faceted TiO 2 was modified via graphene hybridization, where the separation of photoinduced electron–hole pairs was promoted; thus, the photocatalytic activity was enhanced.


2019 ◽  
Vol 19 (5) ◽  
pp. 2664-2670 ◽  
Author(s):  
Brindha Appavu ◽  
Sivakumar Thiripuranthagan ◽  
Thamaraiselvi Kanagaraj ◽  
Sakthivel Kumaravel ◽  
Elangovan Erusappan

RSC Advances ◽  
2014 ◽  
Vol 4 (108) ◽  
pp. 63238-63245 ◽  
Author(s):  
Hua Lv ◽  
Yumin Liu ◽  
Jiayuan Hu ◽  
Zijin Li ◽  
Yan Lu

Due to the synergistic contributions of graphene and ionic liquid, the as-prepared RGO–Bi2WO6 samples exhibited the remarkably enhanced photocatalytic activities under visible light irradiation.


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