Verma Panchraj, Das Subrata, Raj Shubham, Schneider Raphaël
Applied Chemistry Lab, Department of Chemistry, National Institute of Technology Patna, Bihar 800005, India.
LRGP, CNRS, Université de Lorraine, F-54000 Nancy, France.
Nanomaterials (Basel). 2025 Jun 20;15(13):953. doi: 10.3390/nano15130953.
In this study, a simple and efficient hydrothermal strategy was developed to modify reduced graphene oxide (rGO) with copper (II) oxide (CuO) nanoparticles by varying the weight ratio of rGO relative to CuO (rGO@CuO, rGO@CuO, and rGO@CuO). The obtained materials were further characterized using analytical tools. Photocatalytic performance was assessed using adsorption-photocatalysis experiments under a household LED light source (10 W, λ > 400 nm), and the degree of degradation of doxycycline (DOX) was evaluated using UV-Vis spectrophotometer. The highest efficiency of 100% was achieved with a DOX concentration of 70 ppm, rGO@CuO dosage of 1 mg/mL, and pH 7 within 30 min of irradiation. The degradation kinetics followed the pseudo-first-order model (R ~0.99) and the Langmuir adsorption isotherm, indicating that DOX on the surface is governed by a dynamic equilibrium between adsorption and degradation rates. Furthermore, efficacy was tested using real water samples, and the recyclability of the catalyst was evaluated in up to five cycles.
在本研究中，开发了一种简单有效的水热策略，通过改变还原氧化石墨烯（rGO）与氧化铜（CuO）纳米颗粒的重量比（rGO@CuO、rGO@CuO和rGO@CuO）来修饰还原氧化石墨烯。使用分析工具对所得材料进行进一步表征。在家用LED光源（10 W，λ>400 nm）下通过吸附-光催化实验评估光催化性能，并使用紫外-可见分光光度计评估多西环素（DOX）的降解程度。在DOX浓度为70 ppm、rGO@CuO用量为1 mg/mL且pH为7的条件下，在30分钟的辐照时间内实现了100%的最高效率。降解动力学遵循准一级模型（R~0.99）和朗缪尔吸附等温线，表明表面上的DOX受吸附和降解速率之间的动态平衡控制。此外，使用实际水样测试了有效性，并评估了催化剂在多达五个循环中的可回收性。
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