Photocatalytic Properties and Graphene Oxide Additional Effects in TiO₂

Abstract

Photocatalytic activity in TiO2 attract great attention because it promising application in contaminations on degradation and energy conversation. However there is a need on TiO2 band gap modification to be equivalent with the visible light. Thus, inviting several method of addition certain elements including in this study, the additional of graphene oxide (GO) was investigated. GO were prepared by Hummer method before it was added into TiO2. The formation of GO from it graphite precursor had been confirmed by Raman spectroscopy. The existence of D-band at wavelength of 1328 cm-1 and G-band at 1573 cm-1 shows the formation of GO. The GO was then added in different concentration; 0.0 - 1.0 wt% into TiO2. The photocatalytic activity was determined using calculating the photodegradation efficiencies of methylene blue under UV light irradiation. The experimental results showed that the photodegradation of MB were increased with higher dopants concentration due to reduction of band gap energy of TiO2 from 3.2 eV to 3.0 eV for 1.0 wt% GO-with the photodegradation efficiency of GO doped TiO2 was 61.38%.

A Fast Adsorption of Azithromycin on Waste-Product-Derived Graphene Oxide Induced by H-Bonding and Electrostatic Interactions

“…The Raman spectrum of GO exhibits two prominent peaks (Figure S1) at around 1358 and 1594 cm –1 , corresponding to the D- and G-bands, respectively . The D-band represents the defects or disorder of the GO system, while the G-band indicates the first-order stretching of sp 2 -bonded carbon atoms. , The intensity ratio of the D- and G-bands ( I D / I G ) helps to measure the degree of disorder or functionalization. , The calculated I D / I G ratio of GO is 0.88, and this result has similarities with the previous reported values. , Moreover, the ratio of intensities of the D- and G-bands is also used to determine the number of layers. The I D / I G for GO was ∼1, indicating that prepared GO has a multilayer structure …”

“…The Raman spectrum of GO exhibits two prominent peaks ( Figure S1 ) at around 1358 and 1594 cm –1 , corresponding to the D- and G-bands, respectively. 56 The D-band represents the defects or disorder of the GO system, while the G-band indicates the first-order stretching of sp 2 -bonded carbon atoms. 30 , 56 The intensity ratio of the D- and G-bands ( I D / I G ) helps to measure the degree of disorder or functionalization.…”

“… 56 The D-band represents the defects or disorder of the GO system, while the G-band indicates the first-order stretching of sp 2 -bonded carbon atoms. 30 , 56 The intensity ratio of the D- and G-bands ( I D / I G ) helps to measure the degree of disorder or functionalization. 30 , 53 The calculated I D / I G ratio of GO is 0.88, and this result has similarities with the previous reported values.…”

Solvent Evaporation Rate as a Tool for Tuning the Performance of a Solid Polymer Electrolyte Gas Sensor

“…In the Raman spectrum of the carbon working electrode (the white square Figure 1 a), the two most important peaks are at around 1343 cm −1 and 1588 cm −1 , as seen in Figure 3 a (orange curve). These peaks can be assigned to the D-band and G-band of the carbon material, respectively [ 53 ]. The second most prominent peaks are located around 2662 cm −1 , representing the G’(2D) -band, and 2912 cm −1 , representing the D+G -band.…”

Effect of graphite oxide electrochemically exfoliated over a multimode interference filter

“…These bands correspondence to the D and G bands with a shift due to the presence of traces of H2SO4 that could not be removed completely from the exfoliation process. According to Ferrari et al [29] and Noor et al [30], in Raman graphite oxide any band dominates IG/ID ≈ 1, and in the case of high presence of graphene oxide the G band dominates with a ratio IG/ID = 3 [30]. In figure 5 it's possible to observe a G band increasing when the bias is 12 V, to confirm it a fitting using Lorentz function was realized over the bands and the ratio IG/ID was calculated.…”