One-step synthesis of magnetic N-doped carbon nanotubes derived from waste plastics for effective Cr(Ⅵ) removal

IF 5.3 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY Arabian Journal of Chemistry Pub Date : 2024-08-10 DOI:10.1016/j.arabjc.2024.105956

Song Cheng , Xiangwang Zeng , Peng Liu

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Abstract

The magnetic nitrogen-doped carbon nanotube is prepared by one-pot using waste plastics as feedstock in the existence of the urea and Fe(NO₃)₃ for Cr(Ⅵ) removal form wastewater. The characterization analysis indicates that the nitrogen is successfully doped on the magnetic nitrogen-doped carbon nanotube with specific surface area of the 158.71 m²/g and saturation magnetization of the 36.47 emu g⁻¹. The existence of the nitrogen group and Fe₃C contributes to Cr(Ⅵ) removal by complexation and reduction with adsorption capacity of the 27.47 mg g⁻¹. The adsorption data is fitting well with the Pseudo-second order model, demonstrating chemisorption of Cr(Ⅵ). The Cr(Ⅵ) removal mechanism analysis indicates that Fe⁰, Fe²⁺, H*, oxygen-containing group and nitrogen-containing group are crucial to Cr(Ⅵ) removal. The key mechanism of the enhanced Cr (VI) removal is the reductive capacity by dissolved Fe²⁺, which accounts for 23.6 % of the overall Cr(VI) removal. The magnetic nitrogen-doped carbon nanotube is prepared from waste plastic for Cr (VI) removal from wastewater.

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从废塑料中一步合成掺杂 N 的磁性碳纳米管，有效去除 Cr(Ⅵ)

以废塑料为原料，在尿素和Fe(NO3)3存在的条件下，通过一锅法制备了磁性掺氮碳纳米管，用于去除废水中的铬（Ⅵ）。表征分析表明，氮成功掺杂到磁性氮掺杂碳纳米管上，其比表面积为 158.71 m2/g，饱和磁化率为 36.47 emu g-1。氮基团和 Fe3C 的存在有助于通过络合和还原作用去除 Cr（Ⅵ），其吸附容量为 27.47 mg g-1。吸附数据与伪二阶模型非常吻合，证明了 Cr（Ⅵ）的化学吸附作用。铬（Ⅵ）去除机理分析表明，Fe0、Fe2+、H*、含氧基团和含氮基团对铬（Ⅵ）的去除至关重要。增强铬（Ⅵ）去除的关键机制是溶解的 Fe2+ 的还原能力，占整个铬（Ⅵ）去除的 23.6%。利用废塑料制备的磁性掺氮碳纳米管可用于去除废水中的六（Cr）。

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来源期刊

Arabian Journal of Chemistry CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

10.80

自引率

3.30%

发文量

763

审稿时长

63 days

期刊介绍： The Arabian Journal of Chemistry is an English language, peer-reviewed scholarly publication in the area of chemistry. The Arabian Journal of Chemistry publishes original papers, reviews and short reports on, but not limited to: inorganic, physical, organic, analytical and biochemistry. The Arabian Journal of Chemistry is issued by the Arab Union of Chemists and is published by King Saud University together with the Saudi Chemical Society in collaboration with Elsevier and is edited by an international group of eminent researchers.