Novel Green Approach for Fabrication of Ag₂CrO₄/TiO₂/Au/r-GO Hybrid Biofilm for Visible Light-Driven Photocatalytic Performance

Abstract

Development of cutting edge materials using a benevolent ecologically cordial methodology is an ideal approach for heterogeneous visible light photocatalysis. A new biogenic photocatalyst was developed by coupling titanium dioxide (TiO 2 ) decorated elongated rhombic shape silver chromate (Ag 2 CrO 4 ) with gold (Au) and reduced graphene oxide (r-GO) for dye degradation applications under visible light. An ecologically positive methodology was utilized to develop the quaternary Ag 2 CrO 4 /TiO 2 /Au/r-GO nanostructures biofilm with gold and reduced graphene oxide (r-GO) via impregnation and in situ reduction technique in the presence of acacia gum. The structural properties and morphology of the Ag 2 CrO 4 /TiO 2 /Au/r-GO nanostructures were described by several spectroscopic and microscopic methods such as XRD, XPS, ATR-FTIR, Raman spectroscopy, FE-SEM, etc. Alteration with Au and r-GO decreased the band vitality and essentially improved the visible light ingestion of the quaternary Ag 2 CrO 4 /TiO 2 /Au/r-GO composite biofilm photocatalyst and slowed down the recombination process of the photogenerated electrons and holes. To demonstrate how such a unique heterostructured biofilm might produce more outstanding photocatalytic activity, we examined a comparison of the photocatalytic performances of Ag 2 CrO 4 /TiO 2 /Au/r-GO hybrid biofilm with different inner structures. The photocatalytic debasement of MB reached almost 97% within 52 min, and it has been found that the Ag 2 CrO 4 /TiO 2 /Au/r-GO biofilm increased the degradation rate of MB by a factor of 10.8, 6.5, and 3.1 in comparison with exposed Ag 2 CrO 4 , Ag 2 CrO 4 /TiO 2 , and Ag 2 CrO 4 / TiO 2 /Au biofilms, individually. Further, the high electron movement capacity of Ag 2 CrO 4 /TiO 2 /Au/r-GO biofilm was explored by photoelectrochemical investigation and TCSPC to comprehend the mechanistic insight of the superior activity of this composite nanostructures under visible light illumination. Hence, the present investigation describes a facile, eco-friendly, and biomimetic approach for the fabrication of Ag 2 CrO 4 /TiO 2 /Au/r-GO biofilm based photocatalyst using acacia gum.

Recent Advances in Plasmonic Photocatalysis Based on TiO2 and Noble Metal Nanoparticles for Energy Conversion, Environmental Remediation, and Organic Synthesis

“…In another study, a green approach has been utilized for the synthesis of VIS light active Au-TiO 2 nanocomposite modified with Ag 2 CrO 4 and RGO biofilm. [233] The quaternary Ag 2 CrO 4 / TiO 2 /Au/RGO nanostructures biofilm has been synthesized by using the impregnation approach and further in situ reduction was applied in the presence of acacia gum. To examine the photocatalytic properties of the synthesized unique heterostructure, MB degradation was studied under VIS light irradiations.…”

Interfacial Engineering of CuCo2S4/g-C3N4 Hybrid Nanorods for Efficient Oxygen Evolution Reaction

“…In ATR-FTIR spectra of as-synthesized PDTC (Figure a), the peaks appearing at 2932 and 2867 cm –1 are due to pyrrolidine–CH 2 stretching vibrations in an asymmetric and symmetric manner . The C–N stretching vibration bands of the NCS were observed at 1465 and 1328 cm –1 . − Peaks at 978 cm –1 can be correlated with CS of the −CSS – group, ,− whereas the C–S vibration band was found to be centered at 887 cm –1 . Further, the characteristic peaks at 549 and 483 cm –1 due to the stretching vibration of the Cu–S bond strongly support the formation of the Cu­[PDTC] 2 complex (Figure c).…”

Graphitic Carbon Nitride Composites with MoO3-Decorated Co3O4 Nanorods as Catalysts for Oxygen and Hydrogen Evolution

“…The ATR-FTIR spectrum of g-C 3 N 4 [Figure a­(i)] shows the peaks at 808 and 887 cm –1 , which are due to the breathing modes of the triazine ring and the deformation mode of N–H bonds, respectively . The peaks at 1236.47, 1316, 1359.76, 1410, and 1467 cm –1 were assigned to the aromatic sp 3 C–N bonds while the peak at 1647.7 cm –1 corresponds to the sp 2 CN stretching vibration modes. − However, the spectrum [Figure a­(ii)] of Co 3 O 4 /MoO 3 /g-C 3 N 4 shows a strong peak at 995.03 cm –1 , which is attributed to the terminal Mo–O stretching vibration of the orthorhombic MoO 3 phase. The ATR-FTIR spectrum also shows a broad and sharp peak in the region 1000–900 cm –1 attributed to the stretching vibration of molybdenyl bond ν s (MO).…”