Preparation of network-like ZnO–FeWO₄ mesoporous heterojunctions with tunable band gaps and their enhanced visible light photocatalytic performance

Abstract

The enhanced photocatalytic activity of ZnO–FeWO4 composites is ascribed to both heterojunction construction and their tunable band gaps.

Fabrication of FeWO4@ZnWO4/ZnO Heterojunction Photocatalyst: Synergistic Effect of ZnWO4/ZnO and FeWO4@ZnWO4/ZnO Heterojunction Structure on the Enhancement of Visible-Light Photocatalytic Activity

“…After the introduction of FeWO 4 on the surface of ZnWO 4 /ZnO substrates, almost all of the FeWO 4 @ZnWO 4 /ZnO composites showed prominent absorbance in the visible light region, and the visible light absorption abilities of the composites were gradually enhanced with the increase of loaded-FeWO 4 content. However, excessive loaded-FeWO 4 would lead the decreasing of the visible light absorption ability of the composites, which may be attributed to the well-known quantum confinement of nanoparticles. , …”

“…However, excessive loaded-FeWO 4 would lead the decreasing of the visible light absorption ability of the composites, which may be attributed to the well-known quantum confinement of nanoparticles. 34,42 Photocatalytic Properties. The photocatalytic performance of the prepared photocatalysts was evaluated by degradation of RhB under visible light irradiation.…”

“…Ferrous tungstate (FeWO 4 ), possessing a narrow band gap, has attracted considerable attention in recent years due to its outstanding visible light absorption ability . FeWO 4 -related heterojunction photocatalysts such as FeWO 4 /TiO 2 and FeWO 4 /ZnO presented excellent visible-light-driven photocatalytic activity. Therefore, coupling ZnWO 4 /ZnO substrate with FeWO 4 to form a FeWO 4 @ZnWO 4 /ZnO heterostructure might be a positive strategy to obtain high-efficiency visible light photocatalysts.…”

Construction of in situ self-assembled FeWO4/g-C3N4 nanosheet heterostructured Z-scheme photocatalysts for enhanced photocatalytic degradation of rhodamine B and tetracycline

“…For pure FeWO 4 , the positions of all peaks can be well indexed to the monoclinic phase of FeWO 4 (JCPDS card no. 46-1446) 51. It can also be found that the diffraction peaks of FeWO 4 /CNN composites consisted of the characteristic peaks of FeWO 4 and CNNs, which implied the coexistence of FeWO 4 and CNN phases in the as-prepared FeWO 4 /CNN composites.…”

“…FeWO 4 /CNN composites were synthesized through a solvothermal method. 47,51 First, an appropriate amount of the asprepared CNNs was dispersed in 36 mL of ethylene glycol by sonication for 30 min, to facilitate the uniform growth of FeWO 4 nanoparticles on their surface. Then, 5 mmol of FeCl 3 $6H 2 O dissolved in 2 mL double distilled water was added to the CNN suspension and stirred magnetically for 30 min.…”