有机聚合物修饰的纳米结构冷凝凝胶从水溶液中吸附铅的动力学研究

IF 1.4 4区 化学 Q4 CHEMISTRY, PHYSICAL Colloid Journal Pub Date : 2024-05-30 DOI:10.1134/S1061933X24600131
T. S. Kuznetsova, A. E. Burakov, O. A. Ananyeva, I. V. Burakova, A. E. Memetova, V. O. Yarkin, A. G. Tkachev
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引用次数: 0

摘要

摘要 文章提出了一种基于氧化碳纳米管和还原氧化石墨烯的聚苯胺改性纳米复合低温凝胶的生产方法。酚醛树脂被用作交联剂。低温凝胶通过真空冷冻干燥获得。然后,对材料进行后处理,即在管式炉中进行碳化。获得的纳米复合材料通过扫描和透射电子显微镜、红外光谱、X 射线衍射分析和拉曼光谱等方法进行了综合诊断。通过氮吸附法估算了孔隙的参数。研究发现,碳化纳米复合低温凝胶是一种介孔材料,比表面积为 299 m2/g。将初始材料的红外光谱、拉曼光谱和 X 射线衍射图谱与碳化冷凝凝胶的光谱进行了比较。结果表明,纳米复合材料呈现出所有起始材料的峰值。以模型水溶液中重金属铅离子的吸附为例,对材料的吸附能力进行了评估。为了确定吸附机制和吸附时间,对有限体积内的吸附进行了动力学研究。结果表明,在最初的 15 分钟内,99% 的污染物被吸附,吸附容量达到 295 毫克/克。埃洛维奇模型、伪一阶和伪二阶模型以及内扩散模型被用来证实所提出的吸附机理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Kinetics of Lead Sorption from Aqueous Solutions on Nanostructured Cryogel Modified with Organic Polymers

The article proposes a method for producing polyaniline-modified nanocomposite cryogel based on oxidized carbon nanotubes and reduced graphene oxide. Phenol–formaldehyde resin has been used as a crosslinking agent. Cryogel has been obtained by freeze drying in vacuum. Then, the material has been subjected to a post-processing, i.e., the carbonization in a tubular furnace. The obtained nanocomposite has been subjected to the comprehensive diagnostics by the methods of scanning and transmission electron microscopy, IR spectroscopy, X-ray diffraction analysis, and Raman spectroscopy. The parameters of the pore space have been estimated by nitrogen adsorption. It has been found that the carbonized nanocomposite cryogel is a mesoporous material with a specific surface area of 299 m2/g. IR and Raman spectra and X-ray diffraction patterns of the starting materials have been compared with the spectra of the carbonized cryogel. According to the results obtained, the nanocomposite exhibits peaks of all starting materials. The sorption capacity of the material has been evaluated by the example of the sorption of ions of a heavy metal, lead, from model aqueous solutions. Kinetic studies of adsorption in a limited volume have been carried out to determine the mechanism and time of the adsorption. It has been revealed that 99% of the contaminant is sorbed during the first 15 min, while an adsorption capacity of 295 mg/g is reached. The Elovich model, pseudo-first- and pseudo-second-order models, and an intradiffusion model have been employed to confirm the proposed adsorption mechanism.

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来源期刊
Colloid Journal
Colloid Journal 化学-物理化学
CiteScore
2.20
自引率
18.20%
发文量
36
审稿时长
6-12 weeks
期刊介绍: Colloid Journal (Kolloidnyi Zhurnal) is the only journal in Russia that publishes the results of research in the area of chemical science dealing with the disperse state of matter and surface phenomena in disperse systems. The journal covers experimental and theoretical works on a great variety of colloid and surface phenomena: the structure and properties of interfaces; adsorption phenomena and structure of adsorption layers of surfactants; capillary phenomena; wetting films; wetting and spreading; and detergency. The formation of colloid systems, their molecular-kinetic and optical properties, surface forces, interaction of colloidal particles, stabilization, and criteria of stability loss of different disperse systems (lyosols and aerosols, suspensions, emulsions, foams, and micellar systems) are also topics of the journal. Colloid Journal also includes the phenomena of electro- and diffusiophoresis, electro- and thermoosmosis, and capillary and reverse osmosis, i.e., phenomena dealing with the existence of diffusion layers of molecules and ions in the vicinity of the interface.
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