Efficient Photocatalytic Degradation and Adsorption of Tetracycline over Type-II Heterojunctions Consisting of ZnO Nanorods and K-Doped Exfoliated g-C3N4 Nanosheets,Industrial & Engineering Chemistry Research

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Efficient Photocatalytic Degradation and Adsorption of Tetracycline over Type-II Heterojunctions Consisting of ZnO Nanorods and K-Doped Exfoliated g-C3N4 Nanosheets
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-02-10 , DOI: 10.1021/acs.iecr.9b06911
Chun Jin _{1,

2} , Wei Li _{1,

2} , Yasi Chen _{1,

2} , Rui Li _{1,

2} , Jiabin Huo _{1,

2} , Qinyu He _{1,

2} , Yinzhen Wang _{1,

2}

Affiliation

Here, we report a simple hydrothermal method and in situ calcination to synthesize ZnO/K-CN_x heterostructure nanocomposites. The optimized ZnO/K-CN_0.5 exhibits excellent photocatalytic degradation and adsorption efficiency of tetracycline under simulated sunlight, and the degradation rate reaches 90% (the adsorption removal rate is 50%). Moreover, ZnO/K-CN_0.5 also has high stability and recyclability. The excellent photocatalytic activity can be attributed to the following factors. (1) The K-doped exfoliated g-C₃N₄ nanosheet (K-CN) and the ZnO nanorod form a unique type-II heterojunction that promotes the separation of photogenerated carriers and provides very short photogenerated carrier diffusion distances. (2) The surface ζ-potential can enhance the adsorption capacity of tetracycline through electrostatic attraction and repulsion, resulting in synergistic effects of photocatalysis and adsorption. This work highlights the important role of integrating doping and exfoliation techniques into type-II heterojunctions to form nanocomposite photocatalyst materials, which have great potential in environmental water pollution treatment and the maintenance of human health.

中文翻译：

ZnO纳米棒和K掺杂脱落的gC ₃ N ₄纳米片组成的II型异质结上四环素的高效光催化降解和吸附作用

在这里，我们报告了一种简单的水热方法和原位煅烧以合成ZnO / K-CN _x异质结构纳米复合材料。优化的ZnO / K-CN _0.5在模拟阳光下表现出优异的光催化降解和四环素的吸附效率，降解率达到90％（吸附去除率为50％）。此外，ZnO / K-CN _0.5也具有高稳定性和可回收性。优异的光催化活性可以归因于以下因素。（1）掺K的剥落gC ₃ N ₄纳米片（K-CN）和ZnO纳米棒形成独特的II型异质结，可促进光生载流子的分离并提供非常短的光生载流子扩散距离。（2）表面ζ电位可通过静电吸引和排斥作用增强四环素的吸附能力，从而产生光催化和吸附的协同作用。这项工作强调了将掺杂和剥离技术集成到II型异质结中以形成纳米复合光催化剂材料的重要作用，这些材料在环境水污染处理和维护人类健康方面具有巨大潜力。

更新日期：2020-02-10

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