Kuznetsova Tatiana S, Burakov Alexander E, Burakova Irina V, Pasko Tatiana V, Dyachkova Tatiana P, Mkrtchyan Elina S, Memetova Anastasia E, Ananyeva Oksana A, Shigabaeva Gulnara N, Galunin Evgeny V
Department of Technology and Methods of Nanoproducts Manufacturing, Tambov State Technical University, 106/5, Building 2, Sovetskaya St., 392000 Tambov, Russia.
Department of Organic and Ecological Chemistry, Institute of Chemistry, University of Tyumen, 6 Volodarskogo St., 625003 Tyumen, Russia.
Polymers (Basel). 2023 Feb 22;15(5):1101. doi: 10.3390/polym15051101.
This paper considers the synthesis of a novel nanocomposite based on reduced graphene oxide and oxidized carbon nanotubes modified with polyaniline and phenol-formaldehyde resin and developed through the carbonization of a pristine aerogel. It was tested as an efficient adsorbent to purify aquatic media from toxic Pb(II). Diagnostic assessment of the samples was carried out through X-ray diffractometry, Raman spectroscopy, thermogravimetry, scanning and transmission electron microscopy, and infrared spectroscopy. The carbonized aerogel was found to preserve the carbon framework structure. The sample porosity was estimated through nitrogen adsorption at 77 K. It was found that the carbonized aerogel predominantly represented a mesoporous material having a specific surface area of 315 m/g. After carbonization, an increase in smaller micropores occurred. According to the electron images, the highly porous structure of the carbonized composite was preserved. The adsorption capacity of the carbonized material was studied for liquid-phase Pb(II) extraction in static mode. The experiment results showed that the maximum Pb(II) adsorption capacity of the carbonized aerogel was 185 mg/g (at pH 6.0). The results of the desorption studies showed a very low desorption rate (0.3%) at pH 6.5 and a rate of about 40% in a strongly acidic medium.
本文考虑了一种新型纳米复合材料的合成，该材料基于还原氧化石墨烯和用聚苯胺及酚醛树脂改性的氧化碳纳米管，并通过原始气凝胶的碳化制备而成。它被测试为一种从有毒的Pb(II)中净化水生介质的高效吸附剂。通过X射线衍射、拉曼光谱、热重分析、扫描和透射电子显微镜以及红外光谱对样品进行诊断评估。发现碳化气凝胶保留了碳骨架结构。通过在77 K下的氮气吸附来估计样品的孔隙率。发现碳化气凝胶主要是一种比表面积为315 m/g的介孔材料。碳化后，较小的微孔有所增加。根据电子图像，碳化复合材料的高孔隙结构得以保留。研究了碳化材料在静态模式下对液相Pb(II)萃取的吸附容量。实验结果表明，碳化气凝胶对Pb(II)的最大吸附容量为185 mg/g（在pH 6.0时）。解吸研究结果表明，在pH 6.5时解吸率非常低（0.3%），在强酸性介质中解吸率约为40%。
