Enhanced photocatalytic inactivation of Cylindrospermopsis raciborskii by modified TiO2/Ag3PO4: Efficiency and mechanism
Enhanced photocatalytic inactivation of Cylindrospermopsis raciborskii by modified TiO2/Ag3PO4: Efficiency and mechanism
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DOI：
10.1016/j.cej.2023.141464
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发表时间：
2023-02
影响因子：
15.1
通讯作者：
Li Zhou;Xu Zhang;Mingxiu Cai;Naxin Cui;G. Zou;Zhiyong Zhao
中科院分区：
文献类型：
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作者：
Li Zhou;Xu Zhang;Mingxiu Cai;Naxin Cui;G. Zou;Zhiyong Zhao
为有效抑制新出现的有害藻类拉氏金鱼藻，采用茶多酚还原法和化学沉积法制备了具有氧空位的改性TiO 2/Ag 3 PO 4（T-P25/A），并在可见光下进行了除藻实验。氧空位的产生影响了P25的能带结构，提高了T-P25/A复合材料的光催化性能。光生空穴（h+）和超氧自由基（·O2-）是T-P25/A光催化体系中的主要活性物种，可见光照射5 h后，T-P25/A对拉氏毛藻（Drospermopsis raciborskii）的灭活率为91.75%。其降解率分别是P25/A和Ag 3 PO 4的1.5倍和1.7倍。此外，T-P25/A在可见光下的藻失活机制表明，形态特征的变化，细胞内容物降解，氧化物种积累，和酶活性。本研究为真实的水体中有害藻类细胞的灭活提供了有价值的应用前景信息。
To effectively inhibit the emerging harmful algaeCylindrospermopsis raciborskii, modified TiO2/Ag3PO4(T-P25/A) with oxygen vacancies was successfully synthesized by tea polyphenol (TP) reduction and chemical deposition methods for algae removal under visible light. The creation of oxygen vacancies affected the band structure of P25 and improved the photocatalytic performance of the T-P25/A composite. The photogenerated holes (h+) and superoxide radicals (·O2–) are dominant reactive species in the photocatalytic system of T-P25/A, which yielded a 91.75 % inactivation rate toCylindrospermopsis raciborskii(cyanobacteria cells) after 5 h of visible light irradiation. This degradation rate was about 1.5 and 1.7 times that of P25/A and Ag3PO4, respectively. Furthermore, the algal inactivation mechanism by T-P25/A under visible light was indicated by changes in morphological characteristics, cellular content degradation, oxidative species accumulation, and enzyme activity. This research provides valuable information about applicational prospects for the inactivation of harmful algal cells in real water bodies.