Efficient photocatalytic degradation of ciprofloxacin using floating α-NiMoO4/mpg-C3N4/EP under visible light

被引：2

作者：

Truong, Hai Bang ^{[1
,2
]}

Dao, Duy Quang ^{[3
,4
]}

Do, Ha Huu ^{[5
]}

Van Tran, Vinh ^{[6
]}

Nguyen, Chi Van ^{[7
,8
]}

Rabani, Iqra ^{[9
]}

Hur, Jin ^{[10
]}

机构：

[1] Optical Materials Research Group, Science and Technology Advanced Institute, Van Lang University, Ho Chi Minh City

[2] Faculty of Applied Technology, School of Technology, Van Lang University, Ho Chi Minh City

[3] Institute of Research and Development, Duy Tan University, Da Nang

[4] School of Engineering and Technology, Duy Tan University, Da Nang

[5] NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City

[6] Department of Mechanical Engineering, Gachon University, Seongnam

[7] Center for Innovative Materials and Architectures, Ho Chi Minh City

[8] Vietnam National University, Ho Chi Minh City

[9] Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul

[10] Department of Environment and Energy, Sejong University, Seoul

来源：

Chemosphere | 2024年 / 366卷

关键词：

Antibiotics; DFT computation; Floating catalyst; Photocatalysis; Water treatment;

D O I：

10.1016/j.chemosphere.2024.143413

中图分类号：

学科分类号：

摘要：

Conventional water treatment processes often fail to effectively remove antibacterial drugs, necessitating advanced strategies. This study presents the synthesis of novel floating, visible light-active α-NiMoO4/mpg-C3N4/EP composites for the removal of ciprofloxacin (CFX), a widely used quinolone antibiotic, from water. These composites are easily recoverable, highly stable, and demonstrate excellent reusability. The optimal photocatalyst, NC-101/EP (α-NiMoO4/mpg-C3N4 = 10:1), achieved 96.2 ± 1.1% degradation of CFX at 1.6 g L−1 within 80 min under visible light, significantly outperforming previous benchmarks. This high efficiency is attributed to the formation of interfacial junctions and a built-in electric field, which enhanced charge transfer and hydroxyl radical generation through an S-scheme mechanism. Fluorescence spectroscopy provided precise monitoring of CFX degradation without interference from coexisting intermediates. Density functional theory (DFT) calculations revealed that hydroxyl radicals initiated highly favorable and spontaneous oxidation of CFX, with a reaction rate constant of 6.04 × 109 M−1 s−1. The preferred oxidation pathway followed the sequence: HO-addition > H-abstraction > single electron transfer. Four degradation pathways were identified, with key intermediates confirmed by high-resolution mass spectrometry. The process also significantly reduced CFX toxicity, ensuring minimal environmental impact. These findings position NC-101/EP as a promising photocatalyst for large-scale water treatment applications targeting antibiotic contamination. © 2024 Elsevier Ltd

引用

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