One-Step High-Temperature Solvothermal Synthesis of TiO₂/Sulfide Nanocomposite Spheres and Their Solar Visible-Light Applications

Abstract

A one-step high-temperature hydrated-sulfate assisted solvothermal method has been developed to synthesize TiO(2)/sulfide nanocomposite spheres. Different hybrid spheres of TiO(2)/CdS, TiO(2)/Cu(2)S, TiO(2)/FeS, TiO(2)/Co(9)S(8), and TiO(2)/ZnS were readily prepared by exploiting different hydrated sulfate. The hydrated sulfate has been proved to play multifunctional roles during the synthetic process, such as spherical template, water supplier, and composition controller. Nanocrystal CdS can be reduced from CdSO(4) at a high solvothermal temperature of 350 °C, and the TiO(2)/CdS nanocomposite spheres prepared by this method exhibit superior visible-light-driven photocatalytic efficiency because of its effective heterointerface and high crystallinity.

State‐of‐the‐Art Progress in Diverse Heterostructured Photocatalysts toward Promoting Photocatalytic Performance

“…The narrow bandgap semiconductors were often coupled with TiO 2 to form a type-II heterostructures such as CdS/ TiO 2 , [67][68][69][70][71][72] WO 3 /TiO 2 , [73][74][75] Fe 2 O 3 /TiO 2 , [ 76,77 ] AgBr/TiO 2 , [ 78 ] CeO 2 /TiO 2 , [ 79 ] which is an effective approach to extend the photoresponse to the visible-light region. Typically, the visiblelight generated electron of CdS/TiO 2 transfered from the CB of CdS to the CB of TiO 2 , while the photoinduced hole of CdS remained in the VB of CdS, resulting in improvement of electron-hole separation and high effi ciency for photodegradation of MB dye under visible-light irradiation.…”

A New Synergetic Nanocomposite for Dye Degradation in Dark and Light

“…Many research groups have attempted to reduce the band gap of wide band gap semi-conductors from UV-region to visible region in order to harness maximum region of solar spectrum. Such attempts include doping/co-doping with metal/non-metal ions21222324, compositing with activated carbon/CNT/fullerenes/graphene2526 and coupling with narrow band gap semiconductors272829. It has been established that dopants act as trapping sites for photocharge carriers, lowering the efficiency.…”

Hydrothermal synthesis of visible light active zinc-doped tin disulfide photocatalyst for the reduction of aqueous Cr(VI)

“…As the absorption coefficient (α) is proportional to the Kubelka-Munk function (F(R ∞ )), F(R ∞ ) can be used instead of α for estimating the E g values [34][35][36][37][38]. So, the curves of (F(R ∞ ) ν) 2 versus ( ν) for Zn-SnS 2 and SnS 2 were plotted in Fig.…”