Photodegradation of rhodamine B and 4-chlorophenol using plasmonic photocatalyst of Ag–AgI/Fe3O4@SiO2 magnetic nanoparticle under visible light irradiation

Core–shell structured γ-Fe2O3@SiO2@AgBr:Ag composite with high magnetic separation efficiency and excellent visible light activity for acid orange 7 degradation

“…In contrast, immobilizing catalysts on the surface of magnetic nanoor microparticles is an effective way to solve the above problem, by which the catalysts can be easily separated by an external magnet under the premise of keeping photocatalytic activity [23]. Recently, Fe 3 O 4 @SiO 2 @AgX (X = Cl, Br, or I) photocatalysts have been prepared by immobilizing AgX on silica-coated magnetic Fe 3 O 4 particles [24][25][26]. These composite photocataltysts can be successfully separated by applying an external magnetic field.…”

“…These composite photocataltysts can be successfully separated by applying an external magnetic field. However, there are still some deficiencies, such as wide size distribution [24], irregular morphological structures [25], and low AgX loading amount [26], which are harmful to separation efficiency and photocatalytic activity. For instance, An et al [25] reported that the majority of Fe 3 O 4 @SiO 2 @AgCl nanoparticles can be magnetically separated within 1 min, but as long as 30 min is needed to completely harvest the nanoparticles.…”

Synthesis of magnetically separable N, La-doped TiO2 with enhanced photocatalytic activity

“…As can be seen from previous study [30], H 2 O 2 could form through the reaction of photo-generated electrons and holes with adsorbed oxygen/water, whereas O 2 ÀÅ and Å OH were possibly involved. Following this theory, several radical scavengers were used in the degradation of Rh B over FST.…”

Magnetically separable Fe3O4@SiO2@TiO2-Ag microspheres with well-designed nanostructure and enhanced photocatalytic activity

“…On the other hand, noble metal nanoparticles and especially silver nanoparticles are often applied to modify TiO 2 , because Ag nanoparticles can act as electron traps aiding electron-hole separation and facilitate electron excitation by creating a local electrical field. The relatively low cost as compared to other noble metals, bactericidal property, and special behavior for oxygen adsorption also make silver a better choice for modification of TiO 2 [21][22][23][24][25][26]. Enhancement of performance is an important task for applications of heterogeneous photocatalysts, therefore, it is expected that a magnetic composite of nanosized TiO 2 decorated with Ag nanoparticles may be a powerful photocatalyst.…”