Potassium Poly(heptazine imide) Coupled with Ti(3)C(2) MXene-Derived TiO(2) as a Composite Photocatalyst for Efficient Pollutant Degradation.
Potassium Poly(heptazine imide) Coupled with Ti(3)C(2) MXene-Derived TiO(2) as a Composite Photocatalyst for Efficient Pollutant Degradation.
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DOI：
10.1021/acsomega.3c00150
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发表时间：
2023-03-28
期刊：
影响因子：
4.1
通讯作者：
Yao, Kaisheng
中科院分区：
文献类型：
--
作者：
Chen, Binbin;Lu, Weiwei;Xu, Peng;Yao, Kaisheng
光催化降解污染物是解决环境问题的有效和可持续的途径，而开发高效、低成本、稳定的光催化剂是其关键。聚七嗪酰亚胺钾（K-PHI）是一种新型的氮化碳材料，但具有高电荷复合率的特点。为了解决这个问题，K-PHI与MXene Ti 3C 2衍生的TiO 2原位复合以构建II型异质结。采用TEM、XRD、FT-IR、XPS、UV-vis反射光谱等技术对K-PHI/TiO 2复合光催化剂的形貌和结构进行了表征。复合材料的两个组件之间的强大的异质结构和紧密的相互作用进行了验证。在可见光照射下，K-PHI/TiO 2光催化剂对罗丹明6 G具有良好的去除活性。当K-PHI与Ti 3C 2的混合物中K-PHI的质量分数为10%时，制备的K-PHI/TiO 2复合光催化剂的光催化降解效率最高，可达96.3%。电子顺磁共振表征表明，·OH自由基是降解罗丹明6 G的活性物种。
The photocatalytic degradation of pollutants is an effective and sustainable way to solve environmental problems, and the key is to develop an efficient, low-cost, and stable photocatalyst. Polymeric potassium poly(heptazine imide) (K-PHI), as a new member of the carbon nitride family, is a promising candidate but is characterized by a high charge recombination rate. To solve this problem, K-PHI was in-situ composited with MXene Ti3C2-derived TiO2 to construct a type-II heterojunction. The morphology and structure of composite K-PHI/TiO2 photocatalysts were characterized via different technologies, including TEM, XRD, FT-IR, XPS, and UV–vis reflectance spectra. Robust heterostructures and tight interactions between the two components of the composite were verified. Furthermore, the K-PHI/TiO2 photocatalyst showed excellent activity for Rhodamine 6G removal under visible light illumination. When the weight percent of K-PHI in the original mixture of K-PHI and Ti3C2 was set to 10%, the prepared K-PHI/TiO2 composite photocatalyst shows the highest photocatalytic degradation efficiency as high as 96.3%. The electron paramagnetic resonance characterization indicated that the·OH radical is the active species accounting for the degradation of Rhodamine 6G.
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