2,4,6-三氨基嘧啶修饰的生物质多孔碳负载 g-C3N4 的复合材料增强土霉素去除率,Journal of Applied Polymer Science

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2,4,6-三氨基嘧啶修饰的生物质多孔碳负载 g-C3N4 的复合材料增强土霉素去除率
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-05-01 , DOI: 10.1002/app.54027
Hekun Ding ₁ , Qiongyue Zhang ₁ , Xingjin Yang ₁ , Qingge Feng _{1,

2} , Dongbo Wang _{1,

2} , Zheng Liu _{1,

2}

Affiliation

由于传统的gC ₃ N ₄光催化剂存在电荷转移率低、光吸收能力低等严重问题，不可避免地限制了其在环境污染治理中的应用。在此，将 2,4,6-三氨基嘧啶 (TAP) 掺杂的三聚氰胺与生物质多孔碳 (BPC) 混合，通过一步热缩合合成了具有理想导电性的 TAP-BPC/CN 复合材料。即用TAP的碳原子部分取代gC ₃ N _{4的三均三嗪结构中的氮原子}，并减小了石墨层状结构的层间距离，从而提高了材料的导电性并抑制了光生载流子的复合。同时，BPC的加入也有助于增加材料的活性位点，提高光生载流子的分离效率。此外，TAP-BPC/CN 中 pn 同质结的形成在界面处构建了内部电场，从而诱导能带弯曲并有效改善电荷分离和转移。因此，TAP-BPC/CN 样品在土霉素 (OTC) 的降解中表现出优异的吸附和光催化活性。

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A composite of biomass porous carbon supported g-C3N4 by 2,4,6-triaminopyrimidine modification for enhancing oxytetracycline removal

Since the traditional g-C₃N₄ photocatalyst was severely affected by low charge transfer rates and light absorption capacity, which inevitably limited its application in environmental pollution treatment. Herein, mixing the 2,4,6-triaminopyrimidine (TAP) doped melamine and biomass porous carbon (BPC), the TAP-BPC/CN composite with desirable conductivity was synthesized by one step thermal condensation. That is, the carbon atom of TAP was used to partially replace the nitrogen atom of tri-s-triazine structure of g-C₃N₄, and decreased the interlayer distance of graphite lamellar structure, then improved the electrical conductivity of the materials and suppressed the recombination of photogenerated carriers. At the same time, the incorporation of BPC also contributed to increase the active sites of the material and enhance the separation efficiency of photogenerated carriers. Furthermore, the formation of p-n homojunction in TAP-BPC/CN built the construction of an internal electric field at the interface, which induced the band bending and improved charge separation and transfer effectively. As a result, the sample of TAP-BPC/CN exhibited an excellent adsorption and photocatalytic activities in the degradation of oxytetracycline (OTC). This research provides a new strategy for efficient photocatalysts with high absorption and photocatalysis in the antibiotic wastewater treatment.

更新日期：2023-05-01

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