Improved photodegradation of anionic dyes using a complex graphitic carbon nitride and iron-based metal–organic framework material,Faraday Discussions

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Improved photodegradation of anionic dyes using a complex graphitic carbon nitride and iron-based metal–organic framework material
Faraday Discussions ( IF 3.3 ) Pub Date : 2021-04-19 , DOI: 10.1039/d1fd00010a
Huan V Doan _{1,

2} , Hoa Thi Nguyen ₂ , Valeska P Ting ₃ , Shaoliang Guan _{4,

5} , Jean-Charles Eloi ₁ , Simon R Hall ₁ , Xuan Nui Pham ₂

Affiliation

Introducing heterostructures to graphitic carbon nitrides (g-C₃N₄) can improve the activity of visible-light-driven catalysts for the efficient treatment of multiple toxic pollutants in water. Here, we report for the first time that a complex material can be constructed from oxygen-doped g-C₃N₄ and a MIL-53(Fe) metal–organic framework using facile hydrothermal synthesis and recycled polyethylene terephthalate from plastic waste. The novel multi-walled nanotube structure of the O-g-C₃N₄/MIL-53(Fe) composite, which enables the unique interfacial charge transfer at the heterojunction, showed an obvious enhancement in the separation efficiency of the photochemical electron–hole pairs. This resulted in a narrow bandgap energy (2.30 eV, compared to 2.55 eV in O-g-C₃N₄), high photocurrent intensity (0.17 mA cm⁻², compared to 0.12 mA cm⁻² and 0.09 mA cm⁻² in MIL-53(Fe) and O-g-C₃N₄, respectively) and excellent catalytic performance in the photodegradation of anionic azo dyes (95% for RR 195 and 99% for RY 145 degraded after 4 h, and only a minor change in the efficiency observed after four consecutive tests). These results demonstrate the development of new catalysts made from waste feedstocks that show high stability, ease of fabrication and can operate in natural light for environmental remediation.

中文翻译：

使用复合石墨氮化碳和铁基金属有机骨架材料改善阴离子染料的光降解

将异质结构引入石墨氮化碳 (gC ₃ N ₄ ) 可以提高可见光驱动催化剂的活性，以有效处理水中的多种有毒污染物。在这里，我们首次报道了一种复合材料可以由掺氧 gC ₃ N ₄和 MIL-53(Fe) 金属-有机骨架使用简便的水热合成和从塑料废物中回收的聚对苯二甲酸乙二醇酯构建而成。OgC ₃ N ₄的新型多壁纳米管结构/MIL-53(Fe) 复合材料能够在异质结处实现独特的界面电荷转移，显着提高了光化学电子 - 空穴对的分离效率。这导致窄带隙能量（2.30 eV，与 OgC ₃ N _{4 中的}2.55 eV 相比）、高光电流强度（0.17 mA cm ^-2，与MIL-53 中的0.12 mA cm ^-2和 0.09 mA cm ^-2相比（ Fe) 和 OgC ₃ N ₄分别）和优异的阴离子偶氮染料光降解催化性能（RR 195 的 95% 和 RY 145 的 99% 在 4 小时后降解，并且在连续四次测试后观察到的效率变化很小）。这些结果证明了由废物原料制成的新型催化剂的开发，该催化剂具有高稳定性、易于制造并且可以在自然光下操作以进行环境修复。

更新日期：2021-04-19

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