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In the social context of increasing water pollution, we conducted an in-depth study to prepare ZnFe2O4@g-C3N4 heterojunction nanocomposites by hydrothermal method. The microscopic morphology and structure were analyzed using XRD, SEM, TEM, UV–Vis, and other characterization methods. The photo-Fenton activity of the highly concentrated antibiotic tetracycline was tested under visible light irradiation in combination with the presence of H2O2, and the catalytic mechanism was investigated. The results showed that the construction of heterojunction significantly improved the catalytic activity of ZnFe2O4@g-C3N4 catalyst prepared by hydrothermal method. The degradation rate of tetracycline at 40 mg L−1 was 92.6% within 60 min, and the degradation rate was 0.06 min−1, which was nearly six times higher than that of pure ZnFe2O4. The results of free radical trapping experiments and electron spin resonance technique indicated that hydroxyl radicals (·OH) and superoxide radicals (·O2−) played important roles in the photo-Fenton degradation of tetracycline. Notably, the catalyst maintained a high degradation rate (87.2%) after five cycles. The heterojunction designed in this thesis may provide a promising strategy for achieving maximum light absorption and is authoritative in meeting environmental requirements in the future. [ABSTRACT FROM AUTHOR]

Flower-shaped BiOI@SnS2 nanocomposites were synthesized by the coprecipitation method. The effects of different composite ratios on the chemical composition, microstructure, morphology, optical properties, photoelectric chemical properties and photocatalytic properties of the samples were discussed. And the photocatalytic performance of the samples were evaluated by the photodegradation of Rhodamine B (RhB) in an aqueous solution under the xenon lamp. The experimental results demonstrated that BiOI@SnS2 nanocomposites were three-dimensional nanoflower-like microsphere structures with good crystallization. BiOI@SnS2 nanocomposites can improve visible light absorption due to their larger specific surface area and optimized energy band structure. BiOI@SnS2 heterojunction can effectively broaden the light visible light response range, accelerate the separation of photogenerated carriers and inhibit the recombination of electron-hole pairs. BiOI@SnS2 Z-scheme heterojunction exhibit excellent photocatalytic activity compared with pure BiOI and SnS2 photocatalysts in the degradation of RhB and the photocatalytic degradation rate of BiOI@SnS2-2 reached 76.8% after 90 min. In addition,.O2− and OH as the main active species in the photocatalytic degradation of RhB. [ABSTRACT FROM AUTHOR]

In recent years, the development of MoS2 as supercapacitor electrode material has been widely reported, and most of them adopt a single method to improve the electrochemical performance of MoS2. Pure MoS2 has poor intrinsic conductivity and easy aggregation, which impedes its electrochemical performance and greatly limits its practical application. In this paper, Co-doped MoS2 was used as the substrate to compound with g-C3N4 to improve the electrochemical performance of MoS2. Mo0.7Co0.3S2/g-C3N4 nanocomposites with different mass ratio were successfully synthesized via solvothermal method. The effects of different ratios on the microstructure and electrochemical properties of samples were studied by a series of tests. The experimental results indicate that Mo0.7Co0.3S2/g-C3N4 nanocomposites are hexagonal structure with good crystallization, the morphologies are mainly nanosheet structure, and Mo0.7Co0.3S2 nanoparticles are uniformly embedded on the surface of g-C3N4 nanosheets. Mo0.7Co0.3S2/g-C3N4 nanocomposites show pseudocapacitance behavior and excellent electrochemical performance, in particular, MCS/CN-2 electrodes (mass ratio of Mo0.7Co0.3S2:g-C3N4 is 9:1) exhibit the best electrochemical performance. This work improves the performance of MoS2 as electrode material of supercapacitor material through doping modification and composite of carbon material and provides reference value for subsequent research. [ABSTRACT FROM AUTHOR]