【摘要】 用水热法将CdS与煅烧的g-C₃N₄复合制备出g-C₃N₄/CdS S型异质结复合光催化材料，使用SEM、XRD、PL和XPS等手段对其表征并进行功函数测试和自由基捕获实验，研究了这种材料的光催化性能。结果表明，在模拟太阳光（氙灯）的照射下，这种光催化材料（g-C₃N₄质量分数为1%）对甲基蓝污染物（MB）的降解率为99.62%（是纯g-C₃N₄降解效率的12倍）；循环降解三次后其降解率仍然达到82.64%，表明其稳定性良好。其原因是，在这种材料的g-C₃N₄和CdS之间形成了S型异质结，电子通过其界面从CdS转移到g-C₃N₄上产生了内建电场，实现了光生电子和空穴在空间上的高速转移，使催化剂具有较强的氧化还原性能。更多还原

【Abstract】 A S-type heterojunction composite photocatalyst of g-C₃N₄/CdS was synthesized by hydrothermal method. The composite material was characterized by SEM, XRD, PL, and XPS. Its photocatalytic performance was evaluated by work function test and free radical trapping test. Under a simulated sunlight irradiation（Xenon lamp）, the degradation rate of methylene blue reached 99.62% when in a 10 mg/L methyl blue suspension with addition of with photocatalytic material* containing g-C₃N₄-1%CdS, which was 12.11 times higher than that of blank g-C₃N₄. After three cycles, the photocatalytic degradation rate of the catalyst still reached 82.64%, indicating good stability. The enhanced photocatalytic activity may be attributed to the formation of a S-type heterojunction between g-C₃N₄ and CdS, where electrons transfer from CdS to g-C₃N₄, creating a built-in electric field that facilitates rapid separation of photogenerated electrons and holes in space, resulting in a strong redox capability of the catalyst. This study may provide a valuable reference for the design and development of high-performance photocatalytic materials.更多还原