Enhancement of water soluble PDI-NapSO3H on the photocatalytic performance of Fe-TiO2 under visible light
Enhancement of water soluble PDI-NapSO3H on the photocatalytic performance of Fe-TiO2 under visible light
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DOI：
10.1016/j.seppur.2022.122801
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发表时间：
2023-02
影响因子：
8.6
通讯作者：
Jie Zhao;Yunning Chen;Renquan Guan;Xueying Cheng;Zhengkai Wu;N. Zhao;Q. Shang;Yingnan Sun
中科院分区：
文献类型：
--
作者：
Jie Zhao;Yunning Chen;Renquan Guan;Xueying Cheng;Zhengkai Wu;N. Zhao;Q. Shang;Yingnan Sun
本文利用水溶性PDI衍生物与TiO 2或铁掺杂TiO 2键合，成功构建了两种复合光催化剂TiO 2 @ PDI-NapSO 3 H和Fe-TiO 2 @ PDI-NapSO 3 H。考察了它们在可见光下对苯酚和双氯芬酸钠的光催化降解性能。结果表明，PDI-NapSO 3 H能有效改善TiO 2的光吸收性能。此外，Fe掺杂在TiO 2中产生的氧空位有效地阻止了光生载流子的复合。PDI-NapSO_3 H较大的共轭面为光生载流子的迁移和分离提供了方便的通道。因此，Fe-TiO 2 @ PDI-NapSO 3 H可以分别在90或120 min内降解几乎99%的苯酚或DCF。而Fe-TiO 2 @ PDI-NapSO 3 H的光催化活性较好。苯酚的降解速率远高于TiO 2 @ PDI-NapSO 3 H。通过光电响应特性分析、自由基捕获实验和EPR测试，探讨了Fe-TiO 2@PDI-NapSO 3 H的能带结构、光生载流子分离效率对光催化性能的影响机理。此外，还提出了DCF可能的降解途径以及光催化降解后环境毒性明显降低的原因。
In this paper, we successfully constructed two composite photocatalysts TiO2@PDI-NapSO3H and Fe-TiO2@PDI-NapSO3H by utilizing water-soluble PDI derivatives to bond with TiO2or iron-doped TiO2. Their photocatalytic performance to degrade phenol and diclofenac sodium (DCF) under visible light were investigated. The results show that PDI-NapSO3H can effectively improve the optical absorption properties of TiO2. Furthermore, the oxygen vacancy produced by doping of Fe in TiO2prevents the recombination of photogenerated carriers effectively. The larger conjugate plane of PDI-NapSO3H provides a convenient channel for the migration and separation of photogenerated carriers. Thus almost 99 % of phenol or DCF can be degraded by Fe-TiO2@PDI-NapSO3H within 90 or 120 min, respectively. However, the photocatalytic activity of Fe-TiO2@PDI-NapSO3H is better. The rate of phenol degradation is much higher than that of TiO2@PDI-NapSO3H. Further, through the photoelectric response characteristic analysis, radical trapping experiment and EPR test, the effects mechanism of the energy band structure, photogenerated carrier separation efficiency on the photocatalytic performance of Fe-TiO2@PDI-NapSO3H were discussed. In addition, the possible degradation pathways of DCF and the reasons for the obvious reduction of environmental toxicity after photocatalytic degradation were proposed.