Novel visible-light-driven direct Z-scheme CdS/CuInS2 nanoplates for excellent photocatalytic degradation performance and highly-efficient Cr(VI) reduction

One‐Step Transformation from Cu2S Nanocrystal to CuS Nanocrystal with Photocatalytic Properties

“…Moreover, one of the most notable merit of metal sulfides is their relatively smaller bandgaps, which make sure that many of them can directly utilize visible light . Especially in recent years, the metal sulfide based photocatalysts (CuS, ZnS, CdS et al) have been extensively used in wastewater treatment field because of its greater light absorption range and excellent photocatalytic performance …”

Synthesis of Z‐Scheme CuInS2@BiOBr Heterojunction Composite with Visible‐Light Activity

“…CuInS 2 has strong visible optical absorption, and the absorption edge of CuInS 2 is about 890 nm. [27] In addition, the gradual red shift of the optical absorption edge of the composite is caused by the load of CuInS 2 with visible light absorption, and as the amount of CuInS 2 increases, the absorption intensity of the composite material in the visible light region is significantly enhanced, indicating that the CuInS 2 photocatalyst is supported on the surface of BiOBr. The band gap energy (Eg) of CuInS 2 @BiOBr composite, pure BiOBr and CuInS 2 samples can be estimated by According to the literature, the band gap energy of CuInS 2 is 1.4 eV.…”

“…The band gap energy (Eg) of CuInS 2 @BiOBr composite, pure BiOBr and CuInS 2 samples can be estimated by According to the literature, the band gap energy of CuInS 2 is 1.4 eV. [27] The band gaps of 3 %-CIB, 5 %-CIB, 7 %-CIB, and 9 %-CIB were counted to be 2.52 eV, 2.39 eV, 2.59 eV, 2.62 eV, respectively. The composite sample has an annual color change from white to yellow, which is caused by the coupling with CuInS 2 , which has a strong visible light response.…”

“…By calculation, the valence band (VB) potential and conduction band (CB) potential of CuInS 2 are 0.58 V and À 0.82 V, respectively, while the CB and VB of BiOBr À . [25][26][27] Therefore, the photocatalytic mechanism of this complex forms a Z-type heterojunction. The holes in the VB of BiOBr and the electrons in the CB of CuInS 2 with high redox activity can be retained, which overcomes the disadvantage of fast photoelectron-hole recombination rate and improves the photocatalytic activity of the composite.…”

Smart Assembly of Sulfide Heterojunction Photocatalysts with Well‐Defined Interfaces for Direct Z‐Scheme Water Splitting under Visible Light

“…The introduction of another semiconductor with suitable energy band potentials to form a Z‐scheme hybrid photocatalyst can overcome these barriers simultaneously . Following this mechanism, some half‐reaction photocatalysts, such as WO 3 , BiVO 4 , Fe 2 O 3 , CuInS 2 , and CoS 2 , have been merged into CdS to assemble direct Z‐scheme hybrid photocatalysts by various methods in recent years. To establish Z‐scheme heterojunctions, cation exchange has attracted considerable attention because it provides a predictable means to design high‐quality interfacial contacts with atomic precision .…”