A facile hydrothermal approach for construction of carbon coating on TiO2 nanoparticles

Abstract

Herein a facile hydrothermal approach is used to construct carbon coated TiO2 nanoparticles employing dextrose as the source of carbon. The procedure is operated at a low temperature of 200 °C. Fourier infrared spectroscopy demonstrated the successful coating of carbon on TiO2 nanoparticles. The phase composition of TiO2 and carbon coated TiO2 nanoparticles were studied using X-ray diffraction and the surface morphology was analyzed by scanning and transmission electron microscopy. The existence of carbon coating on TiO2 nanoparticles was revealed by thermogravimetric analysis through different thermograms exhibited for TiO2 and carbon coated TiO2 nanoparticles. The reported method offers a simple and efficient approach for production of carbon coating TiO2 nanoparticles.

An In Situ Polymerization‐Encapsulation Approach to Prepare TiO2–Graphite Carbon–Au Photocatalysts for Efficient Photocatalysis

“…As illustrated in Scheme , the reference plasmonic photocatalyst consists of Au NPs randomly deposited at the surface of TiO 2 NBs (structure I, Figure S3, Supporting Information). Various methods have been developed to synthesize TiO 2 –C hybrids, e.g., hydrothermal carbonization (HTC) of biomass and ultraviolet (UV) light/HTC reduction of graphene oxide . However, these approaches usually do not allow for facile colocalization of both C and Au.…”

“…Surprisingly, depollution tests and photoelectrochemical cell (PEC) tests and incident photo to current efficient (IPCE) results under visible light (λ > 420 nm) point toward an entirely different conclusion. The photodegradation of methylene blue (MB) as test pollutant was used to assess the catalytic activity of the TiO 2 –Au–C nanostructures under visible light ( Figure ), which also has been widely used for the assessment of the catalytic activity of semiconductor photocatalyst . The plots of C / C 0 versus time ( t ), where C 0 and C are the concentrations of MO at initial reaction time ( t = 0) and at time t , respectively, are shown in Figure a.The activity of the three TiO 2 –Au–C samples is appreciably higher than the one of TiO 2 , TiO 2 @C, and TiO 2 –Au samples.…”

“…The photodegradation of methylene blue (MB) as test pollutant was used to assess the catalytic activity of the TiO 2 -Au-C nanostructures under visible light (Figure 4), which also has been widely used for the assessment of the catalytic activity of semiconductor photocatalyst. [17][18][19][20] The plots of C/C 0 versus time (t), where C 0 and C are the concentrations of MO at initial reaction time (t = 0) and at time t, respectively, are shown in Figure 4a.The activity of the three TiO 2 -Au-C samples is appreciably higher than the one of TiO 2 , TiO 2 @C, and TiO 2 -Au samples. This photodegradation reaction kinetics follows a first-order rate law, [17][18][19][20][21] as shown by a highly linear ln(C 0 /C) versus t plot (R 2 > 0.992, Figure 4b) with the slope corresponding to the reaction rate constant k. The TiO 2 @C-Au@C sample has a photocatalytic activity (k = 9.37 × 10 −3 min −1 ) which is ≈13 times higher than TiO 2 NBs (k = 6.81 × 10 −4 min −1 ) and ≈5 times higher than TiO 2 @C (k = 1.87 × 10 −3 min −1 ).…”

“…[17][18][19][20] The plots of C/C 0 versus time (t), where C 0 and C are the concentrations of MO at initial reaction time (t = 0) and at time t, respectively, are shown in Figure 4a.The activity of the three TiO 2 -Au-C samples is appreciably higher than the one of TiO 2 , TiO 2 @C, and TiO 2 -Au samples. This photodegradation reaction kinetics follows a first-order rate law, [17][18][19][20][21] as shown by a highly linear ln(C 0 /C) versus t plot (R 2 > 0.992, Figure 4b) with the slope corresponding to the reaction rate constant k. The TiO 2 @C-Au@C sample has a photocatalytic activity (k = 9.37 × 10 −3 min −1 ) which is ≈13 times higher than TiO 2 NBs (k = 6.81 × 10 −4 min −1 ) and ≈5 times higher than TiO 2 @C (k = 1.87 × 10 −3 min −1 ). These results suggest that the combination of Au NPs and graphene-like carbon coating on TiO 2 surface introduces a strong synergistic effect for catalysis under visible light radiation as their k values are far greater than the sum of the individual contributions from TiO 2 @C and TiO 2 -Au samples.…”

Evaluación de un reactor para la degradación fotocatalítica de glifosato empleando un catalizador de TiO2-Mn

“…En esta se observan las bandas correspondientes a los bordes Ti-OH, que se encuentran en el rango entre 3391 -3438 cm -1 y corresponden a estiramientos simétricos y asimétricos del grupo hidroxilo [20,21]. Además, se observa una banda amplia alrededor de 3400 cm -1 y un pico en 1640 cm -1 , que han sido reportados como agua adsorbida en la superficie, [22]. Finalmente, se encuentra en el espectro una banda de absorción débil en 2300 -2400 cm -1 correspondiente al enlace Ti-O del dióxido de titanio [21].…”