Photocatalytic degradation of methylene blue under visible light by cobalt ferrite nanoparticles/graphene quantum dots.

IF 2.6 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Beilstein Journal of Nanotechnology Pub Date : 2024-04-29 eCollection Date: 2024-01-01 DOI:10.3762/bjnano.15.43
Vo Chau Ngoc Anh, Le Thi Thanh Nhi, Le Thi Kim Dung, Dang Thi Ngoc Hoa, Nguyen Truong Son, Nguyen Thi Thao Uyen, Nguyen Ngoc Uyen Thu, Le Van Thanh Son, Le Trung Hieu, Tran Ngoc Tuyen, Dinh Quang Khieu
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引用次数: 0

Abstract

A simple approach was developed to synthesize cobalt ferrite nanoparticles/graphene quantum dots (CF/GQDs). The material was prepared from a homogeneous mixture of iron nitrate, cobalt nitrate, and starch at 140, 180 and 200 °C in a 24 h thermal hydrolysis process. The obtained materials were characterised by using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, ultraviolet-visible diffuse reflectance spectroscopy, Fourier-transform infrared spectroscopy, photoluminescence spectroscopy, vibrating-sample magnetometry, and nitrogen adsorption/desorption isotherms. Cobalt ferrite crystals of around 8-10 nm and graphene quantum dots formed directly at 200 °C. Stacking GQDs sheets onto the CF nanoparticles resulted in CF/GQDs nanoparticles. The nanocomposite exhibits satisfactory fluorescent and superparamagnetic properties, which are vital for catalytic applications. The CF/GQDs catalyse significantly the degradation of methylene blue (MB) under visible light. The catalyst can be recycled with an external magnetic field and displays suitable stability. Also, it was reused in three successive experiments with a loss of efficiency of about 5%. The CF/GQDs are considered as an efficient photocatalyst for MB degradation and other dyes.

钴铁氧体纳米颗粒/石墨烯量子点在可见光下光催化降解亚甲基蓝。
我们开发了一种简单的方法来合成钴铁氧体纳米粒子/石墨烯量子点(CF/GQDs)。该材料由硝酸铁、硝酸钴和淀粉的均质混合物在 140、180 和 200 ℃ 下通过 24 小时的热水解过程制备而成。利用 X 射线衍射、扫描电子显微镜、透射电子显微镜、紫外可见光漫反射光谱、傅立叶变换红外光谱、光致发光光谱、振动样品磁力计和氮吸附/解吸等温线对所获得的材料进行了表征。约 8-10 纳米的钴铁氧体晶体和石墨烯量子点在 200 °C 下直接形成。将 GQDs 片堆积到 CF 纳米粒子上,就形成了 CF/GQDs 纳米粒子。这种纳米复合材料具有令人满意的荧光和超顺磁性能,这对于催化应用至关重要。在可见光下,CF/GQDs 能显著催化亚甲基蓝(MB)的降解。该催化剂可在外部磁场作用下循环使用,并显示出适当的稳定性。此外,该催化剂在连续三次实验中被重复使用,效率损失约为 5%。CF/GQDs 被认为是降解甲基溴和其他染料的高效光催化剂。
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来源期刊
Beilstein Journal of Nanotechnology
Beilstein Journal of Nanotechnology NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
5.70
自引率
3.20%
发文量
109
审稿时长
2 months
期刊介绍: The Beilstein Journal of Nanotechnology is an international, peer-reviewed, Open Access journal. It provides a unique platform for rapid publication without any charges (free for author and reader) – Platinum Open Access. The content is freely accessible 365 days a year to any user worldwide. Articles are available online immediately upon publication and are publicly archived in all major repositories. In addition, it provides a platform for publishing thematic issues (theme-based collections of articles) on topical issues in nanoscience and nanotechnology. The journal is published and completely funded by the Beilstein-Institut, a non-profit foundation located in Frankfurt am Main, Germany. The editor-in-chief is Professor Thomas Schimmel – Karlsruhe Institute of Technology. He is supported by more than 20 associate editors who are responsible for a particular subject area within the scope of the journal.
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