S-scheme heterojunction ZnO/g-C3N4 shielding polyester fiber composites for the degradation of MB
S-scheme heterojunction ZnO/g-C3N4 shielding polyester fiber composites for the degradation of MB
复制标题
S型异质结ZnO/g-C3N4屏蔽聚酯纤维复合材料降解MB
DOI：
10.1088/1361-6641/abea6e
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发表时间：
2021-04-01
影响因子：
1.9
通讯作者：
Li, Jin
中科院分区：
文献类型：
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作者：
Liu, Xiang Yu;Li, Jin
太阳能驱动的纳米半导体催化剂在解决环境污染和能源问题方面显示出巨大潜力。它们将太阳能转化为化学能，释放出强氧化性的羟基自由基（OH·），并彻底降解有机污染物。然而，这些光催化剂反过来也可能破坏一些有机载体。因此，我们使用石墨相氮化碳（g - C3N4）作为隔离层，以防止载体聚酯纤维（PET）被氧化锌（ZnO）氧化。通过水热法制备了ZnO - g - C3N4@PET复合材料，光致发光结果表明，ZnO - g - C3N4@PET具有较低的光生电荷复合率，而g - C3N4提高了复合材料的可见光响应，并表现出明显的光催化增强效果。在降解亚甲基蓝（MB）的实验中，与单独的ZnO@PET和g - C3N4@PET相比，ZnO - g - C3N4@PET复合材料的降解效率显著提高。此外，所制备的光催化剂还具有良好的重复使用性，在经过五次循环测试后仍保持较高的降解率。最后，提出了一种可能的光催化降解MB的机制和途径。总之，这是一种构建高效、环保且可持续的负载型光催化剂的可行方法。
Solar-driven nano-semiconductor catalysts have shown great potential in solving environmental pollution and energy issues. They convert solar energy into chemical energy, release strong oxidizing hydroxyl radicals (OH center dot), and thoroughly degrade organic pollutants. However, these photocatalysts in turn may also damage some organic carriers. Therefore, we have used graphite phase carbon nitride (g-C3N4) as the isolation layer to prevent the carrier polyester fiber (PET) from being oxidized by zinc oxide (ZnO). ZnO-g-C3N4@PET composite has been prepared by hydrothermal method, photoluminescence results indicated that ZnO-g-C3N4@PET has a low photo-generated charge recombination rate, while g-C3N4 improves the visible light response of the composite and exhibits an obvious photocatalytic enhancement effect. In the experiment of degrading methylene blue (MB), the degradation efficiency of ZnO-g-C3N4@PET composite has been significantly improved compared with ZnO@PET and g-C3N4@PET alone. In addition, the prepared photocatalyst also has good reusability and still maintains a high degradation rate after five cycles of tests. In the end, a possible mechanism and a pathway of photocatalytic degradation of MB were proposed. All in all, this is a feasible way to build a highly efficient, environmentally friendly and sustainable supported photocatalyst.