Citation: Yue Zhao, Jie Zhang, Mingcan Wu, Li Zhao, Anan Wang, Kezhen Qi. Balancing photocatalytic efficiency and ecological safety: an S-scheme LaCoO₃/PTP-DABDT heterojunction for “Kill-and-Clean” algal bloom control without secondary pollution[J]. Acta Physico-Chimica Sinica, ;2026, 42(10): 100337. doi: 10.1016/j.actphy.2026.100337 shu

Balancing photocatalytic efficiency and ecological safety: an S-scheme LaCoO₃/PTP-DABDT heterojunction for “Kill-and-Clean” algal bloom control without secondary pollution

Yue Zhao ^1,2 ,
Jie Zhang ³ ,
Mingcan Wu ^3,, ,
Li Zhao ² ,
Anan Wang ⁴ ,
Kezhen Qi ^1,,

1.
College of Pharmacy, Dali University, Dali 671000, Yunnan Province, China;
2.
Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei University, Wuhan 430062, Hubei Province, China;
3.
College of Agriculture and Biological Science, Dali University, Dali 671003, Yunnan Province, China;
4.
School of Economics and Management, Dali University, Dali 671003, Yunnan Province, China

Corresponding author: Mingcan Wu, Kezhen Qi,
Received Date: 8 April 2026
Revised Date: 1 June 2026
Accepted Date: 1 June 2026

The conflict between high-efficiency algal inactivation and ecological safety represents a critical bottleneck in the photocatalytic control of harmful algal blooms (HABs). Conventional copper-based photocatalysts, although effective, often cause severe secondary pollution and aquatic toxicity. To address this trade-off, we constructed a biologically safe S-scheme heterojunction by covalently anchoring LaCoO₃ (LCO) octahedrons onto PTP-DABDT amide-imine functional polymers, which were fabricated via solvothermal polymerization of 2,4,6-trihydroxybenzene-1,3,5-tricarbaldehyde (TP) and 2,5-diamino-1,4-benzenedithiol dihydrochloride. Unambiguous spectroscopic evidence, including femtosecond transient absorption (fs-TA) spectroscopy and in-situ irradiated X-ray photoelectron spectroscopy (XPS), confirms the formation of an internal electric field (IEF). This field drives ultrafast S-scheme charge transfer, effectively suppressing charge-carrier recombination while preserving strong redox potentials. Consequently, the optimized 20LCO/PTP-DABDT composite exhibits a remarkable “Kill-and-Clean” effect, achieving 64.39% degradation of chlorophyll-a in Microcystis aeruginosa to suppress algal blooms while simultaneously degrading the released microcystins. More importantly, comparative toxicity analysis reveals a paradigm shift: unlike conventional Cu-based algicides, which induce 100% mortality in non-target organisms (Lateolabrax japonicus), our system maintains a survival rate exceeding 90%. This study presents a pioneering “ecological regulation” strategy, offering a sustainable solution that balances efficient algal inactivation with intrinsic environmental biosafety.
- Amide-imine functional polymer,
- Harmful algae,
- S-scheme heterojunction,
- Microcystis aeruginosa,
- Ecological safety assessment
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Balancing photocatalytic efficiency and ecological safety: an S-scheme LaCoO3/PTP-DABDT heterojunction for “Kill-and-Clean” algal bloom control without secondary pollution

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通讯作者: 陈斌, bchen63@163.com

Balancing photocatalytic efficiency and ecological safety: an S-scheme LaCoO₃/PTP-DABDT heterojunction for “Kill-and-Clean” algal bloom control without secondary pollution