Photocatalytic decolorization of reactive red 198 dye by a TiO2–activated carbon nano-composite derived from the sol–gel method

Abstract

In this research, a TiO 2 -activated carbon nano-composite was prepared by a sol-gel method and characterized by XRD, FE-SEM, EDS, FTIR, BET surface area, photoluminescence spectroscopy and UV-Vis diffuse reflectance spectroscopy. The photocatalytic activity of the nano-composite was evaluated through degradation of reactive red 198 (RR 198) under UV light, and was compared to unsupported TiO 2 . The XRD result indicated that the TiO 2 nano-composite contained only anatase phase. The surface area of the TiO 2 increased from 48 to 100 m 2 /g through the fabrication of the nano-composite. The photocatalytic results indicated that the RR 198 was decolorized around 42 and 38 % during a 210-min irradiation period in the presence of nano-composite and TiO 2 , respectively. It means that nano-composite enhanced the photocatalytic activity of the TiO 2 nanoparticles. After 20 h of irradiation in the presence of the nano-composite, 97 % of RR 198 had degraded.

TiO2/g-C3N4 nanosheets hybrid photocatalyst with enhanced photocatalytic activity under visible light irradiation

“…In the spectrum of g-C 3 N 4 , the absorption band near 1640 cm -1 is attributed to C-N stretching, and the three at 1240, 1320, and 1403 cm -1 to aromatic C-N stretching [33,34]. The band near 807 cm -1 corresponds to the out-of-plane bending vibration of the triazine units [2,35]. A broad band near 3140 cm -1 corresponds to the stretching modes of terminal NH 2 or NH groups at the defect sites of the aromatic ring [36].…”

“…5a and b, in the case of g-C 3 N 4 , a rapid weight loss region occurring from about 680°C is observed, which can be assigned to the combustion of g-C 3 N 4 . It was reported that the tri-s-triazine ring structure and the high temperature condensation make g-C 3 N 4 have a high thermal stability up to 600°C [35]. The weight of the 20 %TiO 2 /g-C 3 N 4 sample decreases rapidly in the temperature range 450-600°C, indicating that the combustion of g-C 3 N 4 occurred in this temperature range.…”

Spectroscopic and Electrical Properties of Sodium Alginate/TiO2-Carbon Nanotube Composite

“…But these were accommodated like clusters of grains at different spots of the polymer films. Particularly, the shape of grains almost seemed to be like stones [28]. Nanocomposite showed new interwoven structure acting as conductive pathway and leading to high conductivity as compared to that of pure NaAlg [29].…”

Photocatalytic Degradation Performance of Fluorine and Nitrogen Co‐doped TiO2/AC Composites over Printing and Dyeing Wastewater under Visible‐Light Irradiation

“…[34] The absorption peaks near 1500 cm À 1 were related to the skeletal vibrations and the absorption peaks at 1640 and 3400 cm À 1 were the bending vibrations of the HÀ OÀ H bonds and stretching vibrations of the OÀ H bonds, respectively. [35] The existence of the characteristic peak of TiÀ O proved that TiO 2 was successfully loaded in the composite material and the existence of Ti-OÀ C bonds indicated that the TiO 2 particles were adhered to the surface of AC in a chemical way, which was firm and could not be easily separated. After fluorine and nitrogen doping, although the absorption peak at 1500 cm À 1 was shifted, the original functional groups did not change and the absorption peak intensity increased.…”