Electrospun CuAl2O4 hollow nanofibers as visible light photocatalyst with enhanced activity and excellent stability under acid and alkali conditions†,CrystEngComm

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Electrospun CuAl2O4 hollow nanofibers as visible light photocatalyst with enhanced activity and excellent stability under acid and alkali conditions†
CrystEngComm ( IF 2.6 ) Pub Date : 2017-11-23 00:00:00 , DOI: 10.1039/c7ce01545c
Jian Zhang _{1,

2,

3,

4,

5} , Changlu Shao _{1,

2,

3,

4,

5} , Xinghua Li _{1,

2,

3,

4,

5} , Jiayu Xin _{1,

2,

3,

4,

5} , Shu Yang _{1,

2,

3,

4,

5} , Yichun Liu _{1,

2,

3,

4,

5}

Affiliation

Photocatalysts with desirable and stable photocatalytic activity under visible light irradiation are of great significance for water purification. In this work, we prepared CuAl₂O₄ hollow nanofibers (HNFs) with diameters of 100–150 nm by combining electrospinning technique and subsequent annealing. The hollow structure could be obtained at appropriate heating rate (3–5 °C min⁻¹), probably because the existence of an oxygen concentration gradient resulted in the faster decomposition of polymer on the surface than the interior of the nanofibers. The CuAl₂O₄ HNFs had large specific surface area for photocatalytic reactions and narrow band gap for good visible light absorption. As expected, the CuAl₂O₄ HNFs exhibited desirable photocatalytic activity for degrading both rhodamine B and methyl orange under visible light irradiation and the calcination temperature strongly affected the photocatalytic performance. Importantly, the photocatalytic activity was very stable at pH 3–11 due to the excellent chemical stability. Moreover, the photocatalytic mechanism was investigated based on trapping experiments and it was found that e⁻, h⁺ and ˙O₂⁻ were the vital species in the reactions. Most of all, the CuAl₂O₄ HNFs could be easily recycled by sedimentation and separation because of their non-woven web structure and good mechanical stability. Therefore, the as-prepared CuAl₂O₄ HNFs as a promising photocatalyst may have good prospects for sustainable development and chemical engineering applications.

中文翻译：

电纺CuAl ₂ O ₄中空纳米纤维作为可见光光催化剂，在酸和碱条件下具有增强的活性和出色的稳定性†

在可见光照射下具有理想且稳定的光催化活性的光催化剂对于水净化具有重要意义。在这项工作中，我们通过结合电纺丝技术和随后的退火制备了直径为100–150 nm的CuAl ₂ O ₄中空纳米纤维（HNF）。中空结构可以在适当的加热速率（3-5°C min ^-1）下获得，这可能是由于氧浓度梯度的存在导致了表面上聚合物的分解比纳米纤维内部的分解更快。CuAl ₂ O ₄ HNFs具有较大的比表面积，可用于光催化反应，带隙窄，可吸收良好的可见光。不出所料，CuAl₂ O₄ HNFs在可见光照射下具有降解罗丹明B和甲基橙的良好光催化活性，并且煅烧温度强烈影响光催化性能。重要的是，由于出色的化学稳定性，在pH 3-11时光催化活性非常稳定。此外，光催化机理是基于捕获实验研究并发现，电子^-，H⁺和O₂^-是在反应中的重要物质。最重要的是，CuAl₂ O₄HNF由于其非织造纤维网结构和良好的机械稳定性，可以通过沉淀和分离轻松回收。因此，所制备的CuAl ₂ O ₄ HNF作为一种有前途的光催化剂可能具有可持续发展和化学工程应用的良好前景。

更新日期：2017-11-23

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