ZnS/CuS nanotubes are synthesized by using ZnO nanorods as the precursor, followed by sulfuration and subsequent cation exchange reaction. The deposition of CuS on ZnS nanotubes are confirmed by EDS analysis, XPS and UV-Vis diffuse reflectance spectroscopy. HRTEM images clearly display the heterojunctions between ZnS and CuS nanoparticles. ZnS/CuS nanotubes exhibit good photocatalytic activity for H2 generation without cocatalysts under visible light irradiation (λ > 420 nm). The H2 generation rate depends on the CuS content in the ZnS/CuS nanotubes. The highest H2 generation rate is 85 times higher than that of copper-free ZnS tubes. The highly improved performance for H2 evolution is supposed to originate from the formation of heterojunctions between ZnS and CuS nanoparticles.
Photocatalytic oxidation technology is a green and low carbon approach for degradation of mineral processing wastewater, which is extensively applied to ecological environment restoration. In this research, coal gangue-ZnS/CuS pyroelectric/photothermal composite photocatalyst is constructed by high temperature calcination method. The temperature difference between heat converted from light energy absorbed by CuS and the circulating condensate water provides the impelling force for the pyroelectric effect. The porous structure of coal gangue acts as a “heat capacitor”, which furnishes greater temperature fluctuation for pyroelectric effect. Furthermore, the hydroxyl groups on the surface of coal gangue can availably adsorb oxygen and facilely form superoxide radicals with electrons. The degradation efficiency of xanthate is as high as 99.5 % within 50 min. This research has significant implications for designing and developing highly efficient photocatalysts for the degradation of mining wastewater.
The tumor microenvironment (TME) poses significant challenges for achieving efficient cancer remission through monotherapy, making multimodal synergistic therapy a key strategy in tumor treatment. Here, we designed and constructed a hollow core–shell nanocage based on zeolitic imidazolate framework-8 (ZIF-8), zeolitic imidazolate framework-8@zinc sulfide@copper sulfide (ZIF-8@ZnS@CuS, denoted as ZZCS), for the combined application of chemodynamic therapy (CDT), photothermal therapy (PTT) and photocatalytic therapy (PCT). The Cu 2+ ions in ZZCS imparted peroxidase (POD)-like and catalase (CAT)-like activities, enabling the generation of toxic hydroxyl radicals ( OH) through POD-like catalysis to enhance CDT effect, while also reacting with overexpressed glutathione (GSH) to elevate intracellular reactive oxygen species (ROS) levels. To overcome the inhibitory effects of hypoxia on PCT in the TME, ZZCS catalyzed the production of O 2 from endogenous hydrogen peroxide (H 2 O 2 ) via CAT-like activity, alleviating hypoxia and enhancing the PCT effect. Furthermore, hollow core–shell heterojunction structure of ZZCS exhibited excellent near-infrared absorption and multiple light reflection effects. Under 808 nm laser irradiation, ZZCS showed a high photothermal conversion efficiency (η = 78.1 %) and generated significant amounts of ROS ( OH, O 2 − , 1 O 2 ), enabling the synergistic elimination of tumor cells via PTT and PCT. Benefiting from the combined CDT/PTT/PCT effects, ZZCS demonstrated excellent therapeutic efficacy in vivo, nearly eradicating tumors. This study may provide a promising foundation and potential direction for advancing multimodal tumor therapy. Future studies will focus on conducting long-term investigations to systematically evaluate the efficacy of ZZCS core–shell nanocages in achieving durable tumor eradication.
危险品化学品经营许可证（带存储）