Nanocomposite matrix conjugated with carbon nanomaterials for photocatalytic wastewater treatment
Nanocomposite matrix conjugated with carbon nanomaterials for photocatalytic wastewater treatment
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DOI：
10.1016/j.jhazmat.2020.124657
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发表时间：
2021-03-26
影响因子：
13.6
通讯作者：
Matsuda, Atsunori
中科院分区：
文献类型：
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作者：
Abd Elkodous, M.;El-Sayyad, Gharieb S.;Matsuda, Atsunori
危险废水修复问题是一个复杂的问题，也是一个全球性的挑战。在此，制备了层状Co0.5Ni0.5Fe2O4/SiO2/TiO2复合基质，并与三种不同尺寸的碳纳米材料、碳点（C点，0D）、单壁碳纳米管（1D）和还原氧化石墨烯（2D）结合，试图创建有效的光催化纳米复合材料，用于去除水中的氯胺-T。微观结构分析证实了纳米复合材料的形成并揭示了它们的化学和结构。元素分布图揭示了元素在整个纳米复合材料基质中的均匀分布，且不含杂质。基质颗粒的球形形状（平均直径约为90 nm）及其与碳纳米材料的结合得到了证实。氮气吸附-解吸等温线表明纳米复合材料是介孔的，但也含有大孔。研究了纳米复合材料的表面化学成分，并显示了一系列可用的结合能。研究了该系统的光催化动力学，并研究了不同参数（如光催化剂剂量和载流子清除剂）对氯胺-T降解效率的影响。负载 10% 碳点的纳米复合材料表现出高紫外线辅助光催化氯胺-T 降解活性（去除效率为 65%）。
The problem of hazardous wastewater remediation is a complicated issue and a global challenge. Herein, a layered Co0.5Ni0.5Fe2O4/SiO2/TiO2 composite matrix was prepared and incorporated with three carbon nanomaterials having different dimensionalities, carbon dots (C-dots, 0D), single-walled carbon nanotubes (1D), and reduced graphene oxide (2D), in an effort to create effective photocatalytic nanocomposites for chloramine-T removal from water. Microstructural analyses confirmed the formation of nanocomposites and revealed their chemistry and structure. Elemental mapping revealed a uniform distribution of elements throughout the nanocomposite matrix that was free of impurities. The spherical shape of the matrix particles (average diameter similar to 90 nm) and their conjugation with the carbon nanomaterials were confirmed. Nitrogen adsorption-desorption isotherms revealed that the nanocomposites were mesoporous but also contained macropores. The surface chemical compositions of the nanocomposites were investigated and showed a range of available binding energies. The kinetics of photocatalysis by the system were studied, and the effects of different parameters (such as photocatalyst dose and charge-carrier scavengers) on the efficiency of chloramine-T degradation were also investigated. The nanocomposite loaded with 10% C-dots exhibited high UV-assisted photocatalytic activity for chloramine-T degradation (65% removal efficiency).