Rational design of the Z-scheme hollow-structure Co9S8/g-C3N4 as an efficient visible-light photocatalyst for tetracycline degradation,Physical Chemistry Chemical Physics

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Rational design of the Z-scheme hollow-structure Co9S8/g-C3N4 as an efficient visible-light photocatalyst for tetracycline degradation
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2021-1-12 , DOI: 10.1039/d0cp04739b
Xueying Wang _{1,

2,

3} , Rui Han _{1,

2,

3} , Hao Liu _{1,

2,

3} , Ximei Wang _{1,

2,

3} , Qin Wei _{1,

2,

3} , Chuannan Luo _{1,

2,

3}

Affiliation

The development of photocatalysts with high catalytic activity that are capable of full utilization of solar energy is a challenge in the field of photocatalysis. Accordingly, in the present study, an efficient Z-scheme cage-structured Co₉S₈/g-C₃N₄ (c-CSCN) photocatalyst was constructed for the degradation of tetracycline antibiotics under visible-light irradiation. The Z-scheme charge-transfer mechanism accelerates the separation of photogenerated charge carriers and effectively improves photocatalytic activity. Moreover, c-CSCN has a hollow structure, allowing light to be reflected multiple times inside the cavity, thereby effectively improving the utilisation efficiency of solar energy. As a result, the photocatalytic activity of c-CSCN is 1.5-, 2.5-, and 5.8-times higher than those of sheet-type Co₉S₈/g-C₃N₄ (s-CSCN), c-Co₉S₈, and g-C₃N₄, respectively, for the degradation of tetracycline. c-CSCN maintains favourable photocatalytic activity over five consecutive degradation cycles, demonstrating its excellent stability. In addition, c-CSCN performs efficient tetracycline removal in different water substrates. Moreover, c-CSCN exhibits excellent ability to remove tetracycline under direct natural sunlight. This work fully demonstrates that c-CSCN has high catalytic activity and the potential for practical application as a wastewater treatment material.

中文翻译：

Z方案空心结构Co9S8 / g-C3N4的合理设计，作为四环素降解的有效可见光光催化剂

能够完全利用太阳能的具有高催化活性的光催化剂的开发是光催化领域中的挑战。因此，在本研究中，一种有效的Z型笼结构Co ₉ S ₈ / gC ₃ N ₄（c-CSCN）光催化剂用于在可见光照射下降解四环素类抗生素。Z方案的电荷转移机制可加速光生载流子的分离，并有效提高光催化活性。而且，c-CSCN具有中空结构，允许光在腔体内多次反射，从而有效地提高了太阳能的利用效率。结果，c-CSCN的光催化活性比片状Co ₉ S ₈ / gC ₃ N ₄（s-CSCN），c-Co ₉ S ₈的光催化活性高1.5、2.5和5.8倍。和gC ₃ N ₄分别用于降解四环素。c-CSCN在五个连续的降解循环中均保持良好的光催化活性，证明了其出色的稳定性。此外，c-CSCN可在不同的水底物中高效去除四环素。此外，c-CSCN在直接的自然阳光下显示出优异的去除四环素的能力。这项工作充分证明了c-CSCN具有很高的催化活性，并有可能作为废水处理材料实际应用。

更新日期：2021-01-27

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