Sensitively monitoring photodegradation process of organic dye molecules by surface-enhanced Raman spectroscopy based on Fe₃O₄@SiO₂@TiO₂@Ag particle

Abstract

Photodegradation of organic dye molecules has attracted extensive attention because of their high toxicity to water resources. Compared with traditional UV-visible spectroscopy, SERS technology can reflect more sensitively the catalytic degradation process occurring on the surface of the catalysts. In this paper, we report the synthesis and structure of Fe3O4@SiO2@TiO2@Ag composite, which integrates SERS active Ag nanostructure with catalytically active titania. The degradation of the typical dye molecule crystal violet (CV), as an example, is investigated in the presence of the as-prepared Fe3O4@SiO2@TiO2@Ag composite structure, which exhibits high catalytic activity and good SERS performance. At the same time, renewable photocatalytic activity was also investigated.

Optimization of Malachite Green Removal from Water by TiO2 Nanoparticles under UV Irradiation

“…TiO 2 particles were prepared according to a classical hydrothermal method [ 19 ]. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) images demonstrated that the TiO 2 particles were sphere-shaped and had a uniform size distribution, with a diameter around 600 nm ( Figure 1 and Figure S1 ).…”

“…The principle of TiO 2 photocatalytic properties is straightforward: When TiO 2 absorbs energy greater than the band gap (approximately 3.2 eV) of itself, electrons can be excited to create electron-hole pairs. These electron-hole pairs migrate to the surface and form hydroxyl groups, which can react with chemicals adsorbed there [ 18 , 19 ]. Therefore, simple, low-cost, and high-efficiency TiO 2 used as a photocatalyst to degrade pollutants is considered an attractive and promising treatment for water pollution.…”

A magnetically separable SO4/Fe-Al-TiO2 solid acid catalyst for biodiesel production from waste cooking oil

“…More importantly, the potential recovery and reusability of these catalysts from the (trans)esterification reaction make them preferable for industrial biodiesel production [13][14][15][16]. Numerous synthetic routes are emerging for the preparation of solid acid catalysts for different applications [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Sulfated metal oxides have been recently used as typical solid acid catalysts for the (trans)esterification process and we have also recently reported the synthesis of a novel titanium sulphate oxide [Ti(SO4)O] catalyst for the (trans)esterification of waste cooking oil (WCO) to form biodiesel [5].…”

“…coating of the surface with different metal oxides and polymers [28,30,39]. Therefore, it is necessary to develop a novel magnetic solid material as a potential catalyst candidate that could fulfil all requirements for the industrial (trans)esterification process.…”

NaYF4:Yb,Tm@TiO2 core@shell structures for optimal photocatalytic degradation of ciprofloxacin in the aquatic environment

“…Among the most photocatalysts, titanium dioxide (TiO 2 ) has aroused the increasing concern due to the extraordinary chemical stability, high photocatalytic activity, biocompatible features, low cost, wide application and environmental friendliness. [8][9][10] However, the photons absorption capacity of TiO 2 is poor due to the broad band gap of ca. 3.2 eV, which requires ultraviolet (UV) light activation.…”