Periodic mesoporous titania with anatase and bronze phases – the new generation photocatalyst: synthesis, characterisation, and application in environmental remediation

Abstract

High-quality 2D-hexagonal ordered mesoporous titania with well-crystallized framework structure and high surface area was successfully synthesized, in a reproducible way, using Pluronic F127, Pluronic P123, Synperonic F108 and CTAB as...

Defect‐induced Ordered Mesoporous Titania Molecular Sieves: A Unique and Highly Efficient Hetero‐phase Photocatalyst for Solar Hydrogen Generation

“…The quantitative phase compositions of these materials were analyzed, and the refined structural parameters are listed in Table 1. The estimated phase composition of P‐25 Powder XRD diffraction data is also in good agreement with reported values [42,48,49] …”

“…EPR : Figure 7(b) and (c) shows the EPR spectra of two different batches of P‐25 and Figure 8 depicts the EPR spectra of N‐doped OMT. In general, the EPR signals at g <2.001 can be assigned to electrons trapped at oxygen vacancy and/or Ti 3+ centers which may be present, at the surface/subsurface and/or bulk, in the crystal lattice [42,63–68] . It is interesting to note that, even at room temperature, the EPR spectra for OMT show a prominent signal at g =1.999 and g =1.978 corresponding to the presence of anatase phase while g=2.019 and g =1.990 could be attributed to the bronze phase, and these assignments are in good agreement with literature data [63–69] .…”

“…The resulting materials were systematically characterized using various analytical, imaging, and spectroscopic techniques. At this juncture, it is also important to note that a cautious control of the slow aging process, which is crucial for the formation of TiO 2 anatase phase with an ordered pore structure, while the formation of TiO 2 (B) phase is due to a high nucleation rate, and possibly also due to the differences in the hydrolysis and the condensation rates of the precursors [42] . Hence, there is a clear distribution of the different phases in the final product and the details of which will be discussed subsequently.…”

“…Therefore, it is highly desirable to identify a synthesis methodology that produces mixed‐phase porous titania containing intrinsic defects. In this regard, Selvam et al [40–43] . have recently demonstrated the successful synthesis of ordered 2D‐hexagonal mesoporous titania in a reproducible way via the kinetically‐controlled EISA process.…”

Nanomaterials for Photocatalytic Degradations of Analgesic, Mucolytic and Anti-Biotic/Viral/Inflammatory Drugs Widely Used in Controlling SARS-CoV-2

“…In a recent study [133], using Pluronic P123, Pluronic F127, CTAB, and Synperonic F108 as structure-directing agents, excellent 2-dimensional hexagonal ordered mesoporous TiO 2 with a large surface area and a well-crystallized framework structure was synthesized properly in a repeatable manner, and the nanostructured matrix that resulted was developed as TMP-123, TMF-127, TMC-016/TMC-036, and TMF-108, respectively. By adjusting the pore structure, all of these materials display large quantities of inherent defects, such as electrons trapped in oxygen vacancies and/or Ti 3+ centers.…”