Marimo-Bead-Supported Core–Shell Nanocomposites of Titanium Nitride and Chromium-Doped Titanium Dioxide as a Highly Efficient Water-Floatable Green Photocatalyst

Abstract

The release of industrial untreated wastewater creates a hazardous impact on the environment. In this regard, the development of environment friendly catalyst is of paramount importance. Here, we report a highly efficient and reusable core-shell TiN/SiO2/Cr-TiO2 (TSCT) photocatalyst which is composed of SiO2-cladded titanium nitride (TiN) nanoparticles (NPs) decorated with Cr-doped TiO2 NPs for the removal of organic contaminant from water.The TiN NPs serve as the main light absorber component with excellent visible light absorption along with Cr-TiO2 NPs. The TSCT shows remarkable improvement in the photodecomposition of methylene blue (MB) over Cr-TiO2 and TiO2 NPs. An efficient structural design is proposed by adopting calcium alginate beads (P-Marimo beads) as transparent scaffold for supporting our TSCT which exhibits floatable nature on the water surface and realizes easy handling as well as excellent reusability for multipurpose water purification. Surprisingly, our TSCT is found to keep its catalytic activity even after the AUTHOR INFORMATION

Titanium Nitride-Supported Platinum with Metal–Support Interaction for Boosting Photocatalytic H2 Evolution of Indium Sulfide

“…As shown in Figure a, pure TiN exhibits the characteristic peaks at around 264, 372, 475, and 590 cm –1 , which can be assigned to acoustic and optical modes of TiN . The broad bands around 300 cm –1 can be associated with the Ti-vibrating modes, and the band around 550 cm –1 is due to the nitrogen-associated optical modes . After loading of Pt nanoparticles, all TiN peaks exhibit a blueshift, indicating that the nitride lattice is marginally perturbed due to the bonding with surface Pt atoms. , In addition, two new characteristic peaks at 174 and 721 cm –1 are observed, which belong to Pt–Pt stretching vibrations and Pt–O vibrations in Pt nanoparticles, respectively. − Figure S19 shows ultraviolet photoelectron spectroscopy (UPS) valence band spectra of TiN and TiN-Pt.…”

“…51 The broad bands around 300 cm −1 can be associated with the Ti-vibrating modes, and the band around 550 cm −1 is due to the nitrogen-associated optical modes. 52 After loading of Pt nanoparticles, all TiN peaks exhibit a blueshift, indicating that the nitride lattice is marginally perturbed due to the bonding with surface Pt atoms. 53,54 In addition, two new characteristic peaks at 174 and 721 cm −1 are observed, which belong to Pt−Pt stretching vibrations and Pt−O vibrations in Pt nanoparticles, respectively.…”

TiN Bridged All‐Solid Z‐Scheme CNNS/TiN/TiO2−x Heterojunction by a Facile In Situ Reduction Strategy for Enhanced Photocatalytic Hydrogen Evolution

“…As shown in Figure a, relative to the strong emission peak of CN, CNNS/TiN/TiO 2− x ‐3 showed a weak fluorescence signal, attributed to the Z‐scheme electrons transfer of from valance band of TiO 2− x to conduction band of CNNS across TiN electron mediator, which led to the PL quenching and reduction of electron–hole recombination. [ 50,51 ] Additionally, to investigate the charge transfer resistance, we acquired Nyquist plots of EIS spectra and analyzed the arc radius for all samples (Figure 6b). In general, in EIS diagrams, the high‐frequency regions were represented by semicircles, depending on the charge transfer, and the low‐frequency regions were represented by straight lines, depending on the mass transfer.…”

Minireview on Solar Desalination and Hydropower Generation by Water Evaporation: Recent Challenges and Perspectives in Materials Science

“…Because of increasing global water scarcity, research in water desalination has accelerated in the past decade. Solar energy conversion efficiency now exceeds 90%, and various hybrid nanomaterials and devices have been proposed. − For example, use of inexpensive transparent ceramics and plasmonic ceramics has been proposed. These can bridge the gap between current scientific work and industrial applications and will make this approach suitable for daily and practical use.…”