Synthesis of C-N-S-Tridoped TiO₂ from Vietnam Ilmenite Ore and Its Visible Light-Driven-Photocatalytic Activity for Tetracyline Degradation

Abstract

In this study, C-N-S-tridoped TiO 2 composite was fabricated from TiO 2 prepared from ilmenite ore and thiourea by means of hydrothermal method. The obtained material was characterized by X-ray diffraction, Raman scattering spectroscopy, UV-Vis diffuse reflectance spectroscopy, nitrogen adsorption-desorption isotherms, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). It was found that C-N-S-tridoped TiO 2 material has a large specific surface area, showing good photocatalytic activity on the degradation of antibiotic tetracycline in visible light region. The study on the mechanism of tetracycline photodegradation using the liquid chromatography with mass spectrometry was performed. It was found that tetracycline has been degraded over C-N-S-tridoped TiO 2 catalyst into many different intermediates which can eventually be converted into CO 2 and H 2 O. The kinetics of photocatalytic decomposition of tetracycline were investigated. In addition, the obtained material could catalyze well the degradation of other antibiotics (ciprofloxacin and chloramphenicol) and dyes (rhodamine-B, methylene blue, and organe red). The catalyst was stable after five recycles with slight loss of catalytic activity, which indicates great potential for practical application of C-N-S-tridoped TiO 2 catalyst in treatment of wastewater containing tetracycline in particular or antibiotics in general.

Bio-Inspired C/N/TiO2 Hybrid Composite Heterostructure: Enhanced Photocatalytic Activity under Visible Light

“…Figure 3(c) shows the Raman spectra of C/N/TiO 2 hybrid composite. In particular, the Raman peaks at roughly 144 (E g ), 203 (E g ), 399 (B1 g ), 519 (B1 g ), and 639 (E g ) cm −1 and the spectral pattern fit well with the results that have been reported in the literature for typical anatase TiO 2 [50,51]. In addition to this, Figure 3(c) displays an additional feature in the vicinity of 560 cm −1 [51].…”

Environmental fate of tetracycline antibiotics: degradation pathway mechanisms, challenges, and perspectives

“…Visible light-driven photocatalysis has gained much attention recently in the remediation of environmental pollution. Novel photocatalysts are being developed to work in visible light spectra [74,75]. AgI/BiVO 4 heterostructured photocatalyst was synthesized in situ that has shown excellent photoactivity for TC decomposition under visible light complemented with structure transformation from double type (AgI/BiVO 4 ) to sandwichtype (AgI/Ag/BiVO 4 ).…”

Evaluation of polymeric g-C3N4 contained nonhierarchical ZnV2O6 composite for energy-efficient LED assisted photocatalytic mineralization of organic pollutant

“…8d. There is a negligible decrease in the intensity of peaks in the used catalyst but the structural integrity of the composite prepared is intact [46]. Hence, the 1:1 (ZnV 2 O 6 /g-C 3 N 4 ) seems promising for real-time TC degradation.…”