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[Display omitted] • SnS 2 flakes/CdS rods nanocomposite was synthesized by a two-step hydrothermal method. • Glutathione was introduced as both a structural guide and a hole absorber. • SnS 2 /CdS/GSH had optimal photocathode protection effect compared with SnS 2 /CdS. • The OCP of 304 SS coupled with SnS 2 /CdS/GSH decreased by 320 m V after light. An effective way to enhance photochemical performance can be achieved by optimizing the microstructure of composite semiconductor materials. Here, a two-step hydrothermal method was used to synthesize SnS 2 /CdS composite photoanodes for photocathode protection applications, and glutathione was introduced as a structure-directing agent to enhance the separation efficiency of photogenerated electron-hole pair of SnS 2 /CdS. In the presence of glutathione, SnS 2 became a smaller and thinner nanoflake and hexagonal CdS extended into a rod shape, the combination of them resulted in larger light collection area and higher charge transfer rate. The electrochemical test results demonstrated that the open circuit potential of 304 SS coupled with SnS 2 /CdS/GSH photoanode was negatively shifted to about −0.5 V under light, which not only far exceeded the self-corrosion potential of 304 SS (-0.18 V), but also improved from −0.42 V of SnS 2 /CdS. Further, the photogenerated current density of SnS 2 /CdS/GSH was nearly three times that of SnS 2 /CdS, EIS and polarization curve results also indicated that glutathione enhances the PEC performance of SnS 2 /CdS. Obviously, the type-II heterojunction formed by glutathione-sensitized SnS 2 /CdS provides more electrons for 304 SS, which is beneficial to achieve better photocathodic protection. [ABSTRACT FROM AUTHOR]

The novel magnetically recyclable direct Z-scheme Cd x Zn 1-x S-FG nanocomposites were synthesized by a simple hydrothermal method, which displayed the excellent photocatalytic hydrogen evolution and photocatalytic degradation activity under visible light irradiation. [Display omitted] • The Cd x Zn 1-x S-FG multifunctional photocatalysts were successfully synthesized by a simple hydrothermal method. • The photocatalytic hydrogen evolution and photocatalytic degradation properties of the samples were investigated under visible light irradiations. • The direct Z-scheme transfer of electron-hole pairs was confirmed in Cd x Zn 1-x S-FG nanocomposites. • An easy magnetically separable and recoverable process was achieved. In this paper, we reported a simple hydrothermal strategy to prepare the direct Z-scheme Cd x Zn 1-x S nanorods-Fe 2 O 3 quantum dots heterojunction/reduced graphene oxide (Cd x Zn 1-x S-FG) nanocomposites as the multifunctional photocatalysts for photocatalytic degradation of organic dyes and photocatalytic hydrogen evolution. By adjusting the molar mass ratio of Cd2+ and Zn2+ ions from 9:1 to 1:9, the bandgap of the Cd x Zn 1-x S-FG nanocomposites can be turned from 2.23 to 3.49 eV. The Cd 0.3 Zn 0.7 S-FG nanocomposites exhibited the highest H 2 evolution rate of 26.8 mmol h−1 g−1 and the highest degradation efficiency of 97.32% towards MB in 120 min under the visible light irradiation. The excellent photocatalytic activity can be attributed to the high-efficiency transportation and separation of the photogenerated electron-hole pairs, more catalytic active sites and large specific surface area. The mechanism of the photocatalytic hydrogen evolution and photocatalytic degradation had been investigated by ultraviolet photoelectron spectroscopy, scavenging experiment, and UV–Vis absorption spectra. Considering the unique structure, morphology, and excellent photocatalytic performances of the Cd x Zn 1-x S-FG nanocomposites, it will become a burning star in the field of photocatalysis. [ABSTRACT FROM AUTHOR]

[Display omitted] • SrFe 12 O 19 /MoS 2 heterojunction composite are synthesized via hydrothermal method. • The exposed interface reduce the recombination rate of the photogenerated carrier. • The composite achieved high degradation rate with magnetic recovery ability. Photocatalysis is one of the most promising technologies in wastewater treatment. Efficient degradation under visible light and the recovery capability of the photocatalyst are crucial in real-word applications. Herein, M−type SrFe 12 O 19 was integrated into the surface of flowerlike MoS 2 microsphere via the hydrothermal method. As-prepared SrFe 12 O 19 /MoS 2 composite photocatalyst has effective visible light response and magnetic recovery ability. The SrFe 12 O 19 /MoS 2 composite achieved 97% degradation rate for methylene blue under visible light. The photocatalytic reaction rate of the SrFe 12 O 19 /MoS 2 composite was nearly twice that of pure MoS 2. Transient steady-state fluorescence spectrometry and electrochemical spectrometry revealed that an appropriate amount of SrFe 12 O 19 effectively improves the charge transfer rate and accelerates photoinduced charge carrier separation. The possible photocatalytic degradation mechanism of the SrFe 12 O 19 /MoS 2 composite with the p–n heterojunction was also examined. [ABSTRACT FROM AUTHOR]

The novel magnetically recyclable direct Z-scheme GZxFy nanocomposites were synthesized by a simple hydrothermal method, which displayed the excellent photocatalytic activity under UV and visible light irradiation. • The GZxFy nanocomposites photocatalysts were successfully synthesized by a simple hydrothermal method. • The photocatalytic properties of the samples were investigated under UV and visible light irradiations. • The direct Z-scheme transfer of electron-hole pairs was confirmed in GZxFy nanocomposites. • An easy magnetically separable and recoverable process was achieved. A novel direct Z-scheme ZnS quantum dot (QD)-Fe 2 O 3 QD heterojunction/reduced graphene oxide (rGO) (GZxFy) nanocomposite was successfully synthesized by a simple hydrothermal method. The surface of ZnS and Fe 2 O 3 QDs was modified by COOH and OH groups, respectively. ZnS QDs can be covalently bonded with Fe 2 O 3 QDs by the dehydration reaction to form the ZnS QDs-Fe 2 O 3 QDs heterojunctions. The GZxFy nanocomposites displayed the highest photodegradation efficiency of 96.45% (40 min, UV light) and 90.17% (480 min, visible light) for methylene blue when the mass ratio of ZnS QDs to Fe 2 O 3 QDs was 1:3. The excellent photocatalytic activity could be attributed to the enhanced light-harvesting ability, high large specific surface area, efficient interfacial charge-carrier separation and transfer as well as the low charge transfer resistance. Ultraviolet photoelectron spectroscopy and radical trapping experiments were used to confirm the Z-scheme mechanism formed between ZnS QDs and Fe 2 O 3 QDs, and verify the electron transfer direction for UV or visible light-driven photocatalytic reactions. GZ1F3 nanocomposites showed the excellent superparamagnetic behavior, which enabled its rapid magnetic recycle from the solution within 95 s in a magnetic field. [ABSTRACT FROM AUTHOR]