Zhao Wan, Yang Xiuru, Liu Chunxi, Qian Xiaoxiao, Wen Yanru, Yang Qian, Sun Tao, Chang Wenya, Liu Xin, Chen Zhi
College of Materials and Chemistry, China Jiliang University, 258 Xueyuan Street, Xiasha Higher Education District, Hangzhou 310018, China.
College of Standardization, China Jiliang University, 258 Xueyuan Street, Xiasha Higher Education District, Hangzhou 310018, China.
Nanomaterials (Basel). 2020 Mar 25;10(4):600. doi: 10.3390/nano10040600.
The increasing discharge of dyes and antibiotic pollutants in water has brought serious environmental problems. However, it is difficult to remove such pollutants effectively by traditional sewage treatment technologies. Semiconductor photocatalysis is a new environment-friendly technique and is widely used in aqueous pollution control. TiO is one of the most investigated photocatalysts; however, it still faces the main drawbacks of a poor visible-light response and a low charge-separation efficiency. Moreover, powder photocatalyst is difficult to be recovered, which is another obstacle limiting the practical application. In this article, g-CN/TiO heterojunction is simply immobilized on a glass substrate to form an all-solid-state Z-scheme heterojunction. The obtained thin-film photocatalyst was characterized and applied in the visible-light photodegradation of colored rhodamine B and tetracycline hydrochloride. The photocatalytic performance is related to the deposited layers, and the sample with five layers shows the best photocatalytic efficiency. The thin-film photocatalyst is easy to be recovered with stability. The active component responsible for the photodegradation is identified and a Z-scheme mechanism is proposed.
水中染料和抗生素污染物排放的增加带来了严重的环境问题。然而，传统污水处理技术难以有效去除此类污染物。半导体光催化是一种新型环保技术，广泛应用于水污染控制。TiO是研究最多的光催化剂之一；然而，它仍然面临可见光响应差和电荷分离效率低的主要缺点。此外，粉末光催化剂难以回收，这是限制其实际应用的另一个障碍。在本文中，g-CN/TiO异质结简单地固定在玻璃基板上，形成全固态Z型异质结。对所得薄膜光催化剂进行了表征，并将其应用于罗丹明B和盐酸四环素的可见光光降解。光催化性能与沉积层数有关，五层样品表现出最佳的光催化效率。该薄膜光催化剂易于回收且具有稳定性。确定了负责光降解的活性成分，并提出了Z型机理。
