Fabrication of flexible EDTA-linked 3D graphene sponge for effective adsorption of copper

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2025-10-02 DOI:10.1016/j.diamond.2025.112885

Elif Erçarıkcı , Murat Alanyalıoğlu

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Abstract

Heavy metal contamination in water sources poses a significant environmental and health risk, necessitating the development of efficient technologies for their removal. In this study, we have fabricated a novel, self-standing, durable, compact, and effective adsorbent by modifying a graphene sponge with N-(trimethoxysilylpropyl) ethylenediamine triacetic acid (EDTA-silane) to enhance its affinity for copper ions (Cu²⁺) serving as a model. The structural, crystallographic, and morphological properties of the EDTA-silane functionalized graphene sponge were characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, Fourier-transform infrared spectroscopy, powder X-ray diffraction spectroscopy, and scanning electron microscopy. Batch adsorption experiments revealed exceptional Cu²⁺ uptake capacity, with a maximum adsorption capacity of 1058.6 ± 32.7 mg g⁻¹ for 72 h adsorption time. Kinetic studies demonstrated that the adsorption process followed a pseudo-second-order model, while isotherm analysis indicated multilayered adsorption consistent with the Freundlich model. The high adsorption capacity is attributed to the synergistic effects of the porous structure of the sponge and the strong chelation ability of EDTA groups. These results suggest that EDTA-silane modified graphene sponge is a promising and highly efficient material for copper ion removal.

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柔性edta连接三维石墨烯海绵的制备及其对铜的有效吸附

水源中的重金属污染构成重大的环境和健康风险，因此必须开发有效的清除技术。在这项研究中，我们用N-（三甲氧基硅丙基）乙二胺三乙酸（edta -硅烷）修饰石墨烯海绵，以增强其对铜离子（Cu2+）的亲和力作为模型，制备了一种新型的、独立的、耐用的、紧凑的、有效的吸附剂。采用x射线光电子能谱、拉曼光谱、傅里叶变换红外光谱、粉末x射线衍射光谱和扫描电镜对edta -硅烷功能化石墨烯海绵的结构、晶体学和形态特性进行了表征。批量吸附实验表明，在72 h的吸附时间内，其Cu2+的最大吸附量为1058.6±32.7 mg g−1。动力学研究表明，吸附过程符合拟二阶模型，等温线分析表明多层吸附符合Freundlich模型。高吸附量是由于海绵多孔结构的协同作用和EDTA基团的强螯合能力。这些结果表明，edta -硅烷改性石墨烯海绵是一种很有前途的高效铜离子去除材料。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.