Controlled syntheses of cubic and hexagonal ZnIn2S4 nanostructures with different visible-light photocatalytic performance

Abstract

Cubic ZnIn(2)S(4) nanoparticles and hexagonal ZnIn(2)S(4) flower-like microspheres were controlled synthesized via a facile hydrothermal method by simply changing the metal precursors. The as-prepared samples were characterized by XRD, SEM, TEM and UV-vis DRS. It was found that the metal precursors influenced the final ZnIn(2)S(4) polymorphs, i.e., metal nitrates led to the formation of cubic ZnIn(2)S(4), while metal chlorides resulted in the formation of the hexagonal phase. The formation processes of the cubic ZnIn(2)S(4) nanoparticles and hexagonal ZnIn(2)S(4) flower-like microspheres were investigated and the mechanism of the phase formation was proposed. Although both cubic and hexagonal ZnIn(2)S(4) polymorphs exhibited photocatalytic activity for the degradation of methyl orange (MO) under visible light irradiation, the photocatalytic performances over cubic and hexagonal ZnIn(2)S(4) were different.

Facile Synthesis of Novel Redox-Mediator-free Direct Z-Scheme CaIn2S4 Marigold-Flower-like/TiO2 Photocatalysts with Superior Photocatalytic Efficiency

“…shows that the microspheres are composed of numerous, very thin, densely packed petals which lead to the marigold flower-like morphology. Similar morphologies have been reported by Shen et al 41 and Chen et al 42 in the synthesis of ZnIn 2 S 4 . However, previous reports for CIS have described a mixture of nanoparticles and nanosheet-like morphologies.…”

Preparation of NiS/ZnIn2S4 as a superior photocatalyst for hydrogen evolution under visible light irradiation

“…2 shows the TEM image of our previous studies that the hydrothermally prepared ZnIn 2 S 4 sample was composed of microspheres with dimension in the range of 2–6 μm assembled by densely packed petals [16]. However, the TEM image of the current NiS/ZnIn 2 S 4 sample shows that the ZnIn 2 S 4 microspheres were partially decomposed after the second hydrothermal process (Fig.…”

“…All the reagents are analytical grade and used without further purifications. Hexagonal ZnIn 2 S 4 powder was synthesized according to our previously reported method [16]. In a typical synthesis of 0.5 wt % NiS/ZnIn 2 S 4 photocatalyst, 0.2 g ZnIn 2 S 4 , 2.8 mg nickel acetate and 0.9 mg thioacetamide (TAA) were dispersed in 70 mL of de-ionized water by stirring and ultra-sonication for 2 h. The resultant solution was transferred to a 100 mL Teflon liner, sealed in the stainless steel autoclave and heated at 120 °C for 4 h. After the autoclave was cooled to room temperature, the product was collected and washed with de-ionized water several times before it was dried at 60 °C to obtain the final product.…”

“…ZnIn 2 S 4 is a ternary chalcogenide with a suitable band gap (2.34–2.48 eV) well corresponding to the visible light absorption. ZnIn 2 S 4 exhibits two distinct polymorphs based on cubic and hexagonal lattices [16], which can be controlled synthesized via a facile hydrothermal method using different precursors. Previous studies revealed that both polymorphs of ZnIn 2 S 4 are active for photocatalytic hydrogen generation under visible light irradiations and show considerable chemical stability [17–19].…”

Tuning Two-Dimensional Layer to Three-Dimensional Pillar-Layered Metal–Organic Frameworks: Polycatenation and Interpenetration Behaviors

“…The slight shift in the range of 420−428 nm relative to the free bpydbH 2 ligand (436 nm) for 1−3 may arise from interaction between the ligand and metal ion which is in good agreement with other reported Zn MOFs. 48 There are two ligands coexisting in the framework of 2 and 3, as free bpy ligand only shows weak photoluminescence emission at 486 nm, and the Zn(II) ion do not tend to be oxidized or reduced for its d 10 electronic configuration, so the emissions of 2−3 could neither be owing to metal-to-ligand charge transfer (MLCT) nor attributed to ligand-to-metal charge transfer (LMCT). The fluorescent emissions of 1−3 may originate from the intraligand charge transfer as similar emissions are observed for the free bpydbH 2 .…”