Z-Scheme membrane CdZnS/TiO2 heterojunction photocatalyst for efficient photocatalytic removal of Microcystis aeruginosa under simulated sunlight: Adjustable suspended depth and flexible assembly

doi:10.1016/j.jmst.2024.08.021

J. Mater. Sci. Technol. ›› 2025, Vol. 217: 70-79.DOI: 10.1016/j.jmst.2024.08.021

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Z-Scheme membrane CdZnS/TiO₂ heterojunction photocatalyst for efficient photocatalytic removal of Microcystis aeruginosa under simulated sunlight: Adjustable suspended depth and flexible assembly

Jing Tian^a, Feng Qian^a, Yanguang Zhang^a,c, Weibing Li^a, Jiarun Li^a,*, Shiqiang Chen^b,*, Lei Wang^a

^aSchool of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
^bInstitute of Marine Science and Technology, Shandong University, Qingdao 266237, China
^cQingdao Ruyi Environmental Protection Technology Co., Ltd., Qingdao 266042, China

Received:2024-03-14 Revised:2024-06-04 Accepted:2024-08-17 Published:2025-05-10 Online:2025-05-10
Contact: ^*E-mail addresses: lijiarun@qust.edu.cn (J. Li), chenshiqiang@sdu.edu.cn (S. Chen).

Abstract

Abstract: The application of photocatalytic technology in algae killing is limited by the non-floatability and difficulty in recycling of the photocatalysts. Loading photocatalyst on magnetic or floatable carriers is the most popular method for overcoming the above inadequacies. In this work, a CdZnS/TiO₂ membrane photocatalyst with adjustable suspended depth (include floating) and flexible assembly is designed, which is less prone to dislodgement due to in situ synthesis and has a wider range of applicability than previously reported photocatalysts. The photocatalytic removal of Microcystis aeruginosa revealed that the suspended depth and distribution format of the CdZnS/TiO₂ membrane photocatalysts have striking effects on the photocatalytic removal performance of Microcystis aeruginosa, the photocatalytic removal efficiency of CdZnS/TiO₂-2 membrane photocatalysts for Microcystis aeruginosa could reach to 98.6 % in 60 min when the photocatalysts assembled in the form of 3 × 3 arrays suspended at a depth of 2 cm from the liquid surface. A tiny amount of TiO₂ loading allows the formation of Z-Scheme heterojunction, resulting in accelerating the separation efficiency of photogenerated carriers, preserving the photogenerated electrons and holes with stronger reduction and oxidation ability and inhabiting the photo-corrosion of CdZnS.

Key words: Suspended, Flexible assembly, CdZnS/TiO₂, Membrane photocatalyst, Photocatalytic removal of Microcystis aeruginosa

Jing Tian, Feng Qian, Yanguang Zhang, Weibing Li, Jiarun Li, Shiqiang Chen, Lei Wang. Z-Scheme membrane CdZnS/TiO₂ heterojunction photocatalyst for efficient photocatalytic removal of Microcystis aeruginosa under simulated sunlight: Adjustable suspended depth and flexible assembly[J]. J. Mater. Sci. Technol., 2025, 217: 70-79.

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Z-Scheme membrane CdZnS/TiO₂ heterojunction photocatalyst for efficient photocatalytic removal of Microcystis aeruginosa under simulated sunlight: Adjustable suspended depth and flexible assembly

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