TiO2-chabazite semiconductor composites for photocatalytic degradation of rhodamine under sunlight irradiation

Chabazite Synthesis and Its Exchange with Ti, Zn, Cu, Ag and Au for Efficient Photocatalytic Degradation of Methylene Blue Dye

“…It is observed that with an increase in the time of irradiation with UV light, the peak of maximum absorption at ~664 nm gradually decreases, and a more pronounced change is observed for CuCHA, AuCHA and TiCHA. The change in the color of the MB solution in the AuCHA and TiCHA samples during 30 min of darkness can be explained by the adsorption of MB molecules on the exposed open surface of the chabazite microcrystals [31]. Furthermore, in all photodegradation experiments, it can be observed that absorption bands change slightly at lower wavelengths over time.…”

“…On the XRD diffraction patterns of all ion-exchanged powders, chabazite was found as the main phase. Additionally, a diffraction peak for TiO2 in the anatase phase, with a plane (1 1 1) at 25.3° was identified in the TiCHA sample [31]. It should also be noted that the intensities of the peaks of the TiCHA and AuCHA samples significantly decreased in comparison with the synthesized initial chabazite and other ion-exchange samples.…”

“…Zeolites are an important group of heterogeneous industrial catalysts with large-scale applications in oil refining and petrochemistry and a growing potential for environmental catalysis [30]. For example, zeolites such as chabazite, zeolite Y, mordenite, faujasite and LTA have already been studied as catalyst carriers for the degradation of organic dyes [31][32][33]. In addition to the zeolite ZSM-12, which has been used in the photodegradation of MB with relatively low removal results [34], the synthesis of composite materials such as Zn-ZSM-5 [35], TiO 2 /Ni-ZSM-5 [36], g-C 3 N 4 -H-ZSM-5 [37] and clinoptilolite [38] improves the adsorption of MB to the zeolite surface, obtaining high photodegradation efficiencies.…”

Transformation of Nanostructures Cu2O to Cu3Se2 through Different Routes and the Effect on Photocatalytic Properties

“…Then, the beakers were placed under sunlight, and the samples were periodically taken every hour to measure their optical absorption spectra. The photodegradation efficiency of methylene blue in solution ( D ) was calculated using the following equation 8 , 29 where D is the decolorization efficiency of the catalyst (CuSe-A and CuSe-H), C o is the initial concentration of MB, and C is the concentration of MB at a different time. The MB concentrations were determined from the optical UV–vis absorption spectra.…”

Hydrothermal synthesis of a two‐dimensional g‐C3N4/MoS2/MnOOH composite material and its potential application as photocatalyst

“…Environmental pollution and energy crisis are nowadays considered among the biggest problems facing humanity Among the alternatives explored to redress them, photocatalytic processes are becoming relevant owing to their advantages in terms of cleanliness, economy and safety . In this context, several semiconductor materials have been proposed as photocatalysts for these applications, metal oxides being the most frequently reported, particularly titanium dioxide (TiO 2 ), because it is stable, noncorrosive, environmentally friendly, abundant and inexpensive However, TiO 2 presents some limitations, as its wide band gap energy (3.2 eV) means it is active only in the UV region of the solar spectrum. In order to increase the photocatalytic response in the visible light region of the spectrum, other materials are being studied, such as graphite‐like carbon nitride (g‐C 3 N 4 ), a metal‐free material with interesting characteristics such as its ease of synthesis, its low cost of production, the feasibility of controlling its morphology, and its chemical and thermal stability .…”