Autonomous self-propelled reduced graphene oxide hydrogel-CuO@rGO micromotors for high-efficiency removal of organic dye pollutant

IF 3.5 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology Pub Date : 2025-06-13 DOI:10.1016/j.jconhyd.2025.104650

Zengze Liu , Ziwei Zheng , Yanlin Liu , Xiaoqiu Yang , Yangwei Chen , Fang Tan

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引用次数: 0

Abstract

This study featured about the synthesis of graphene oxide hydrogel-CuO@reduced graphene oxide (rGH-CuO@rGO) micromotors with core-shell structure via an ultrasonication-assisted chemical precipitation method and their application for catalytic dye degradation. The micromotors were comprehensively characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), spectroscopic techniques (Fourier transform infrared (FTIR), Raman), surface area measurement (BET), and X-ray photoelectron spectroscopy (XPS) to determine their microstructure, composition, and chemical states. Degradation performance for methylene blue (MB) was evaluated under varying conditions: reaction time (0–120 min), peroxymonosulfate (PMS) concentration (0–5 g·L⁻¹), pH (3–8), quantity of micromotors (12–24), and MB concentration (5–100 mg·L⁻¹). The removal rate of MB was achieved over 90 % within 120 min at pH 8. The micromotors demonstrated excellent catalytic efficiency, reusability and stability over four cycles. In the dual oxidant system (H₂O₂/PMS) the micromotors exhibited effective self-propulsion and stable MB removal. The generation of hydroxyl (•OH) and sulfate (•SO₄⁻) free radicals in the system was confirmed by electron paramagnetic resonance spectrometer (EPR). Ultra High Performance Liquid Chromatography Quadrupole Time-of-Flight Mass Spectrometry (UHPLC-QTOF/MS) was used to identify the degradation intermediates, and the possible MB degradation pathways were proposed. Moreover, the micromotors showed satisfactory performance in removing mixed dye wastewater and phenolic compound. Additionally, the low ecotoxicity of the micromotors was demonstrated by cytotoxicity assessment. This study provided a novel and valuable route to synthesizing self-driving micromotors with potential extensive applications in environmental remediation.

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用于高效去除有机染料污染物的自主自推进还原氧化石墨烯hydrogel-CuO@rGO微电机

本文研究了超声辅助化学沉淀法合成氧化石墨烯（rGH-CuO@rGO）核壳结构微电机hydrogel-CuO@reduced及其在催化染料降解中的应用。采用x射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、光谱技术（傅里叶变换红外（FTIR）、拉曼光谱）、表面积测量（BET）和x射线光电子能谱（XPS）对微电机进行了综合表征，确定了微电机的微观结构、组成和化学状态。考察了亚甲基蓝（MB）在不同条件下的降解性能：反应时间（0-120 min）、过氧单硫酸根（PMS）浓度（0-5 g·L−1）、pH（3-8）、微电机数量（12-24）和MB浓度（5-100 mg·L−1）。在pH为8的条件下，120 min内MB的去除率达到90%以上。在四个循环中，微电机表现出优异的催化效率、可重复使用性和稳定性。在双氧化体系（h2o2 /PMS）中，微电机表现出有效的自推进和稳定的MB去除效果。电子顺磁共振谱仪（EPR）证实了体系中羟基（•OH）和硫酸盐（•SO₄−）自由基的生成。采用超高效液相色谱-四极杆飞行时间质谱法（UHPLC-QTOF/MS）鉴定降解中间体，提出了MB可能的降解途径。此外，微电机在去除混合染料废水和酚类化合物方面表现出满意的效果。此外，细胞毒性评价表明，微马达具有较低的生态毒性。本研究为合成具有广泛应用前景的自驾车微电机提供了一条新颖而有价值的途径。

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来源期刊

Journal of contaminant hydrology 环境科学-地球科学综合

CiteScore

6.80

自引率

2.80%

发文量

129

审稿时长

68 days

期刊介绍： The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide). The journal''s scope embraces a wide range of topics including: experimental investigations of contaminant sorption, diffusion, transformation, volatilization and transport in the surface and subsurface; characterization of soil and aquifer properties only as they influence contaminant behavior; development and testing of mathematical models of contaminant behaviour; innovative techniques for restoration of contaminated sites; development of new tools or techniques for monitoring the extent of soil and groundwater contamination; transformation of contaminants in the hyporheic zone; effects of contaminants traversing the hyporheic zone on surface water and groundwater ecosystems; subsurface carbon sequestration and/or turnover; and migration of fluids associated with energy production into groundwater.