Comparing the Efficiency of N-Doped TiO2 and N-Doped Bi2MoO6 Photo Catalysts for MB and Lignin Photodegradation

Abstract

In this study, we tested the efficiency of nitrogen-doped titanium dioxide (N-TiO2) and nitrogen-doped bismuth molybdate (N-Bi2MoO6) compounds as photocatalysts capable of degrading methylene blue and lignin molecules under irradiation with ultraviolet (UV) and visible light (VIS). Moreover, we compared TiO2 and Bi2MoO6 catalysts with N-TiO2 and N-Bi2MoO6 compounds using chemical coprecipitation. The catalysts were prepared starting from Ti(OCH2CH2CH3)4, Bi(NO3)3·5H2O, and (NH4)6Mo7O24 reagents. N-doping was achieved in a continuous reflux system, using ethylene diamine as a nitrogen source. The resulting materials were characterized using Scanning Electron Microscopy (SEM), X-Ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). Additionally, we observed the decrease in particle size after processing the compounds in the reflux system. The results regarding photocatalytic degradation tests show a remarkable effect for nitrogen doped samples, achieving 90% of lignin degradation.

The Influence of pH on the Nitrogen-doped TiO2 Structure and Its Photocatalytic Activity on Methylene Blue Degradation

“…The dopednitrogen such as N in the O-Ti-N linkage mostly existed as nitrides species, attributed to the binding energy (BE) of 399.4 eV, and only small amounts were present as surface adsorbed ammonia, corresponding to the BE peak located at 396.0 eV. This result are in agreement with those reported in the XPS result of N-doped TiO2 (Boningari et al, 2018;Rangel et al, 2018;Yoshida et al, 2015). Zhang et al found a higher N1s binding energy as the N in the N-Ti-O due to higher electronegativity of O than N leads to the higher N electron density in the N-Ti-O structure than that of N in the N-Ti-N structure (Zhang et al, 2015).…”

Controllable Hydrothermal Synthesis and Photocatalytic Performance of Bi2MoO6 Nano/Microstructures

“…The value of valence band maximum (VBM) has shifted toward the lower energy (~1.1 eV) of BMO-CTAB (BMO, ~1.5 eV). It demonstrates that the process helps to reduce the separation of the valence band energy level from the Fermi level, which may reduce the concentration of electrons, and promote the generation of hydroxyl radicals (OH) in the photocatalytic process [40][41][42]. In order to further study the information of the crystal structure, infrared spectroscopy and Raman spectroscopy were performed, and the results are presented in Figure 5.…”

Green composites and their contribution toward sustainability: A review

“…Fibers are also susceptible to different types of degradation, such as ultraviolet (UV) and fire degradation due to lignin, as well as thermal degradation due to hemicellulose. 108 The degradation of green composites is also affected overall by the environmental conditions to which the material is exposed. Moisture, UV radiation, temperature, and microorganism activity can negatively impact the interfacial adhesion, causing micro-and macro-cracks in the material, accelerating the biodegradation of the composite.…”

“…Fibers are also susceptible to different types of degradation, such as ultraviolet (UV) and fire degradation due to lignin, as well as thermal degradation due to hemicellulose. 108…”