Binder-free TiO2 hydrophilic film covalently coated by microwave treatment

Abstract

A binder-free attachment method for TiO 2 on a substrate has been sought to retain high active photocatalysis. Here, we report a binder-free covalent coating of phase-selectively disordered TiO 2 on a hydroxylated silicon oxide (SiO 2 ) substrate through rapid microwave treatment. We found that Ti–O–Si and Ti–O–Ti bonds were formed through a condensation reaction between the hydroxyl groups of the disordered TiO 2 and Si substrate, and the disordered TiO 2 nanoparticles themselves, respectively. This covalent coating approach can steadily hold the active photocatalytic materials on the substrates and provide long-term stability. The binder-free disordered TiO 2 coating film can have a thickness (above 38 μm) with high surface integrity with a strong adhesion force (15.2 N) against the SiO 2 substrate, which leads to the production of a rigid and stable TiO 2 film. This microwave treated TiO 2 coating film showed significant volatile organic compounds degradation abilities under visible light irradiation. The microwave coated selectively reduced TiO 2 realized around 75% acetaldehyde degradation within 12 h and almost 90% toluene degradation after 9 h, also retains stable photodegradation performance during the cycling test. Thus, the microwave coating approach allowed the preparation of the binder-free TiO 2 film as a scalable and cost-effective method to manufacture the TiO 2 film that shows an excellent coating quality and strengthens the application as a photocatalyst under severe conditions.

Present and Future of Phase-Selectively Disordered Blue TiO2 for Energy and Society Sustainability

“…To further boost the microbial pathogens inactivation performance of TiO 2 , we need to strengthen the producing amount of ROS species. In the authors’ group previous reports, BTO can generate a higher amount of ROS species under UV, visible or solar light illumination, which is represented by the higher peak intensity of BTO than pristine TiO 2 in electron paramagnetic resonance analysis [ 31 , 48 ]. Therefore, BTO could act as a broad-spectrum antimicrobial agent and outperform pristine TiO 2 by generating sufficient antibacterial and viricidal ROS at different band positions, as depicted in Fig.…”

Pseudo-capacitive and kinetic enhancement of metal oxides and pillared graphite composite for stabilizing battery anodes

“…TiO 2 reveals the enriched –OH and self-doping of Ti 3+ species in A d rTiO 2 , as shown in Supplementary Fig. S1 and Supplementary Table S1 of Supporting Information 22 . Additionally, the phase transformation of Ana.…”

“…2 f, the FT-IR spectrum of SnO 2 [O]rTiO 2 -PGN displays the transmittance peaks of Ti–O–C (795 cm −1 ), Ti–O–Sn (1030 cm −1 ), C=C of PGN (1560 and 1635 cm −1 ), which again evidence the essential chemical interconnections in SnO 2 [O]rTiO 2 -PGN composite. The detailed FT-IR vibration peak assignments are summarized in Table S3 using values from the literature 22 , 31 , 36 – 39 . Moreover, Raman data reveals the E g (151 and 621 cm −1 ), B 1g (395 cm −1 ) and A 1g (508 cm −1 ) bands of TiO 2 , D (1347 cm −1 ), G (1586 cm −1 ), and 2D (2600–3000 cm −1 ) bands of PGN, as shown in Fig.…”