Synthesis and Modification of Zn‐doped TiO₂ Nanoparticles for the Photocatalytic Degradation of Tetracycline

Abstract

The synthesis of Zn-doped TiO2 nanoparticles by solgel method was investigated in this study, as well as its modification by H2 O2 . The catalyst was characterized by transmission electron microscopy, X-ray diffraction, Brunauer-Emmett-Teller, UV-visible reflectance spectra and X-ray photoelectron spectroscopy (XPS). The results indicated that doping Zn into TiO2 nanoparticles could inhibit the transformation from anatase phase to rutile phase. Zn existed as the second valence oxidation state in the Zn-doped TiO2 . Zn-doped TiO2 that was synthesized by 5% Zn doping at 450°C exhibited the best photocatalytic activity. Then, the H2 O2 modification further enhanced the photocatalytic activity. Zn doping and H2 O2 modifying narrowed the band gap and efficiently increased the optical absorption in visible region. The optimal degradation rate of tetracycline by Zn-doped TiO2 and H2 O2 modified Zn-doped TiO2 was 85.27% and 88.14%. Peroxide groups were detected in XPS analysis of H2 O2 modified Zn-doped TiO2 , favoring the adsorption of visible light. Furthermore, Zn-doped TiO2 modified by H2 O2 had relatively good reusability, exhibiting a potential practical application for tetracycline's photocatalytic degradation.

Synthesis of Metal Doped TiO2 Nano-Composites by Sol-Gel Method and Their Structural Properties

“…The synthesis was done by the procedure explained by Shuo Pang et al [11]. In brief, sol-gel method was used to synthesis Zn doped TiO2 nanocomposites.…”

Tetracycline Removal Under Solar Illumination Over Ag3VO4/mpg‐C3N4 Heterojunction Photocatalysts

“…6c showed the kinetic curves of the miscellaneous samples, reflecting that the TC photodegradation follows the pseudo-first-order kinetics. The transparent rate constants are resolved as 0.00801, 0.00167, 0.00151, 0.00339, 0.00624, 0.01966 and 0.01185 min À1 for mpg-C 3 respectively. For comparison, the photocatalytic activity of the standard TiO 2 Degussa P-25 (P25) was evaluated under the same conditions (Fig.…”

“…Accordingly, the compounded semiconductor materials would accomplish with higher photocatalytic activities than their counterparts embracing wide bandgap semiconductors which show the contribution to the separation of charges. Recently, various g-C 3 N 4 -based hetero-structured (12) semiconductors such as g-C 3 N 4 /Ag 2 WO 4 (13), g-C 3 N 4 /MoS 2 (14), g-C 3 N 4 /TiO 2 (15), g-C 3 N 4 /Ag 2 O (16), g-C 3 N 4 /BiOBr (17) and g-C 3 N 4 /WO 3 (18,19) have been reported and demonstrated the improved photocatalytic activities. It should be noted that the photocatalyst particles were well dispersed into the mesoporous g-C 3 N 4 , being special important to transfer the photoexcited charges and inhibit the aggregation of the photocatalyst particles.…”

“…In addition, it is difficult to remove TC in aqueous solution by conventional water treatment due to its solubility and biotoxicity. Consequently, an efficient treatment technology is urgently needed to deal with TC residual . In recent years, on the basis of the general accepted objective to achieve competent utilization of solar‐light radiation to address the aqueous environmental antibiotics pollution, many trials have been made to develop visible‐light‐driven (VLD) semiconductor photocatalysts .…”

The first report of deep eutectic solvent (DES) nano‐photocatalyst (n‐TiO2‐P25@TDI@DES (urea: ZnCl2)) and its application on selective oxidation of benzyl alcohols to benzaldehydes

“…The high value of its band gap, however, has restricted the application of TiO 2 ‐P25 photocatalyst, as its activation will be achieved only by the ultraviolet (UV) radiations whose wavelength is below 400 nm. In this context, methods must be developed to reduce its band gap 45–47 . The fast photo‐generated (electron–hole pair) recombination rate of TiO 2 ‐P25 could also further limit its use.…”