Homojunction type of carbon nitride as a robust photo-catalyst for reduction conversion of CO2 in water vapor under visible light
Homojunction type of carbon nitride as a robust photo-catalyst for reduction conversion of CO2 in water vapor under visible light
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同质结型氮化碳作为强大的光催化剂，用于可见光下水蒸气中二氧化碳的还原转化
DOI：
10.1016/j.cej.2021.132668
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发表时间：
2022-02
影响因子：
15.1
通讯作者：
Youji Li
中科院分区：
文献类型：
--
作者：
Yi Yang;Yuanyuan Chen;Zhenhui Li;Youji Li
光催化还原CO2的增值转化被认为是解决当前能源和环境危机的潜在途径。在本文中，我们报告的机械混合物的热聚合的三聚氰胺（Me）-和3-氨基-1，2，4-三唑（AT）为基础的氮化物碳（MCN和TCN）可以变成同质结材料（MTCN）在空气中煅烧。一系列的表征和光催化测试，结合DFT计算，支持所构建的MTCN具有改善的孔隙率和光电转换效率。富氮结构不仅拓宽了可见光响应范围，而且为CO2在表面的吸附和活化提供了更强的刘易斯碱性位。结果表明，MTCN在可见光照射下对四环素的降解表现出最突出的性能。特别是在常温常压下，其对可见光触发CO2还原的光催化效率可达7.75 μmol·g-1·h-1，是单一MCN或TCN的13.8或16.1倍。该工作为构建CN基同质结光催化剂提供了一条简单的途径，可用于CO2的高效转化.
The value-added conversion of CO2by photocatalytic reduction is considered as a potential way to solve the current energy and environmental crisis. In this paper, we report that a mechanical mixture of the as-thermally polymerized melamine (Me)- and 3-amino-1,2,4-triazole (AT)-based nitride carbons (MCN and TCN) can turn into a homojunction material (MTCN) by a calcination under air. A series of characterizations and photo-catalytic tests, combined with DFT calculations, support that the constructed MTCN has an improved porosity and photoelectric conversion efficiency. And the nitrogen-rich structure not only broadens the visible light response range but also provides stronger Lewis basic sites for the adsorption and activation of CO2at the surface. As a result, MTCN exhibits the most outstanding performance on tetracycline degradation under visible light illumination. In particular, its photo-catalytic efficiency for the visible-triggered CO2reduction under normal temperature and pressure can reach 7.75 μmol·g−1·h−1, which is 13.8 or 16.1 times higher than the single MCN or TCN. This work provides a facile pathway to construct CN-based homojunction photocatalyst for the efficient conversion of CO2into valuable products.
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