Preparation of magnetic Fe3O4/SiO2/Bi2WO6 microspheres and their application in photocatalysis

Improvement of TiO2 photocatalytic properties under visible light by WO3/TiO2 and MoO3/TiO2 composites

“…A typical H1 hysteresis loop can be observed, resulting from the occurrence of capillary condensation phenomenon just as shown in Fig. 2 [31,32]. On the other hand, the BET surface area, pore volume and BJH desorption average pore diameter of all samples are listed in Table 1.…”

Enhanced sunlight-driven photocatalytic activity of graphene oxide/Bi2WO6 nanoplates by silicon modification

“…The incorporated Si atoms could compete with W atoms during the growth of Bi 2 WO 6 crystals, resulting in another crystalline structure Bi 12 SiO 20 peaking at 25.31 and 42.61 [23]. In addition, a broad peak at around 231 was observed for Si-modified GO/BWO sample, which indicates the formation of amorphous SiO 2 [21]. This amorphous SiO 2 is supposed to not only influence the growth of Bi 2 WO 6 crystals, but also act as a bridge for bonding different oxides together.…”

“…Hou et al [19,20] reported that SiO 2 could enlarge the surface area of TiO 2 by forming a porous texture and thus enable the improved photocatalytic efficiency. Chen et al [21] demonstrated a magnetic Fe 3 O 4 / SiO 2 /Bi 2 WO 6 microspheres by using SiO 2 as the bonding bridge of Fe 3 O 4 and Bi 2 WO 6 . The resultant ternary composite exhibited high photocatalytic activity and stability.…”

Superparamagnetic Fe3O4 nanoparticles, synthesis and surface modification

“…Most of these authors have encapsulated the mineral Fe 3 O 4 in a polymer shell in order to obtain a nanostructures "core-shell" with a promising superparamagnetic property. The potential applications of such materials are numerous: photocatalysis [16][17][18], heavy metal ion pollution [19][20], immunological test [21], extraction of phenolic compounds [13,22], magnetic resonance imaging and drug delivery [23][24][25][26], proteins separation [27], magnetic storage media, improving the efficiency of energy conversion in the solar cells [28], rechargeable lithium batteries and photoelectrochemical solar cells using nanomaterial's electrodes [29].…”