N-Doped K3Ti5NbO14@TiO2 Core-Shell Structure for Enhanced Visible-Light-Driven Photocatalytic Activity in Environmental Remediation

Abstract

A novel N-doped K3Ti5NbO14@TiO2 (NTNT) core-shell heterojunction photocatalyst was synthesized by firstly mixing titanium isopropoxide and K3Ti5NbO14 nanobelt, and then calcinating at 500 °C in air using urea as the nitrogen source. The samples were analyzed by X-ray diffraction pattern (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis absorption spectroscopy and X-ray photoelectron spectroscopic (XPS) spectra. Anatase TiO2 nanoparticles were closely deposited on the surface of K3Ti5NbO14 nanobelt to form a nanoscale heterojunction structure favorable for the separation of photogenerated charge carriers. Meanwhile, the nitrogen atoms were mainly doped in the crystal lattices of TiO2, resulting in the increased light harvesting ability to visible light region. The photocatalytic performance was evaluated by the degradation of methylene blue (MB) under visible light irradiation. The enhanced photocatalytic activity of NTNT was ascribed to the combined effects of morphology engineering, N doping and the formation of heterojunction. A possible photocatalytic mechanism was proposed based on the experimental results.

Biolubricants from Rapeseed and Castor Oil Transesterification by Using Titanium Isopropoxide as a Catalyst: Production and Characterization

“…These alcohols were chosen on account of their different structure, with different branching levels (see Table 4), in order to obtain different viscosity values for the products obtained. On the other hand, titanium isopropoxide was chosen due to its effectiveness and the use of titanium catalysts in industry, especially as the precursor of other catalysts such as TiO2 [27][28][29]. As can be observed in Figure 6, methanol was released along with the biolubricant and its removal contributes to better biolubricant production.…”

Synthesis of Novel Iron Porphyrin/Titanoniobate Nanocomposite for Electrochemical Detection of Uric Acid

“…However, the potassium titanium niobate layer distance is relatively small, and its electrochemical activity is quite low. 8 Thus, an improvement method is to insert a functional molecule to replace the potassium ion to increase its electrochemical activity. 9 As shown in Fig.…”