“…The textual parameters, including the BET surface area, pore volume, and pore diameter, were tabulated in Table . According to the classification of IUPAC, the as‐prepared composites exhibit type IV isotherms with H3 hysteresis loop, indicating the presence of mesoporous structure . Obviously, the surface areas of C/CN‐P123‐ x increase firstly and then decrease with the addition of P123.…”
“…The textual parameters, including the BET surface area, pore volume, and pore diameter, were tabulated in Table . According to the classification of IUPAC, the as‐prepared composites exhibit type IV isotherms with H3 hysteresis loop, indicating the presence of mesoporous structure . Obviously, the surface areas of C/CN‐P123‐ x increase firstly and then decrease with the addition of P123.…”
“…There is no obvious diffraction peak of chitin: this may result from the hydrogen bond between TiO 2 and chitin that interferes with the crystallization of chitin, indicating that TiO 2 is completely embedded in the matrix of chitin as the inorganic phase. The characteristic peaks of TiO 2 are at 25.2°, 37.7°, 48.1°, 53.9°, 55.1°, and 62.8°, corresponding to the (101), (004), (200), (105), (211), and (204) crystal faces of anatase TiO 2 (JCPDS 21–1272) as they appear in the so-prepared photocatalyst 35 . Hence, the prepared photocatalytic material exhibits a high photocatalytic activity.Figure 1XRD patterns of chitin, T/CF, and the prepared composites.…”
To improve the catalyst properties of TiO2 under visible light irradiation, chitin-modified TiO2 was synthesized via a hydrothermal method on the surface of carbon fibers. The microstructure and interface properties of the so-prepared photocatalyst were investigated via X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and UV-visible diffuse reflectance spectroscopy. Our results indicated that the synergetic effect of the crystal phase of TiO2, carbon fiber, and chitin is the main reason leading to the improvement of the photocatalytic activity of the composite catalyst. The modified TiO2 sample with chitin content of 0.6 wt% exhibited the highest photocatalytic activity under visible light irradiation when RhB was chosen as the target degradation product. Compared to the pure TiO2/carbon fiber, the sample of TiO2/carbon fiber with 0.6 wt% of chitin exhibits enhanced visible light activity with an apparent rate of degradation about 2.25 times. The enhancement of the photocatalytic performance of the sample with chitin can be attributed to the relatively high adsorption capacity of the particular network structure and photosensitivity of chitin, which can effectively separate the photoelectron-hole pair recombination. Furthermore, the new composite photocatalyst shows excellent catalytic stability after multiple degradation cycles, indicating that it is a promising photocatalytic material for degrading organic pollutants in wastewater.
“…3d showed several strong bands from 1130 cm −1 to 1639 cm −1 , which were associated with stretching and rotation vibrations of C-N and C = N in heterocycles 8 . The band at 805 cm −1 was related to s-triazine ring vibrations and the wide absorption peak at 2000–3500 cm −1 was attributed to the N-H bond 8, 10, 11, 31, 43 . The main characteristic peaks of C 3 N 4 were reduced and several peaks disappeared after loading on TiO 2 .…”
Nanocomposites (CNTi) with different mass ratios of carbon nitride (C3N4) and TiO2 nanoparticles were prepared hydrothermally. Different characterization techniques were used including X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), transmission electron spectroscopy (TEM) and Brunauer-Emmett-Teller (BET). UV-Vis DRS demonstrated that the CNTi nanocomposites exhibited absorption in the visible light range. A sun light - simulated photoexcitation source was used to study the kinetics of phenol degradation and its intermediates in presence of the as-prepared nanocomposite photocatalysts. These results were compared with studies when TiO2 nanoparticles were used in the presence and absence of H2O2 and/or O3. The photodegradation of phenol was evaluated spectrophotometrically and using the total organic carbon (TOC) measurements. It was observed that the photocatalytic activity of the CNTi nanocomposites was significantly higher than that of TiO2 nanoparticles. Additionally, spectrophotometry and TOC analyses confirmed that degraded phenol was completely mineralized to CO2 and H2O with the use of CNTi nanocomposites, which was not the case for TiO2 where several intermediates were formed. Furthermore, when H2O2 and O3 were simultaneously present, the 0.1% g-C3N4/TiO2 nanocomposite showed the highest phenol degradation rate and the degradation percentage was greater than 91.4% within 30 min.
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