Hydrothermal Synthesis of High-Efficiency Carbon Sorbent Based on Renewable Resources

IF 0.8 4区物理与天体物理 Q4 PHYSICS, APPLIED Technical Physics Letters Pub Date : 2023-12-29 DOI:10.1134/s106378502370013x

A. E. Burakov, T. S. Kuznetsova, I. V. Burakova, O. A. Ananyeva, E. S. Mkrtchyan, T. P. Dyachkova, A. G. Tkachev

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Abstract

A technique of synthesis of new sorption materials by hydrothermal carbonization of sunflower meal (HTS) with the addition of graphene oxide (GO) and subsequent carbonization (C) has been developed. To assess morphological and phase changes during carbonization, the materials have been characterized by scanning electron microscopy and IR spectroscopy. According to the results obtained, carbonization facilitates the development of latent porosity and reduces the amount of oxygen-containing and alkyl groups. Kinetic sorption studies have also been carried out by the example of extraction of Pb²⁺ ions and organic dye molecules (methylene blue (MB)). The experimental results show that the adsorption capacities of the HTS, HTS/C, HTS/GO, and HTS/GO/C composites were 82.9, 108.6, 168.9, and 148.3 mg/g, respectively, for extraction of Pb²⁺ ions and 1481.8, 1601.1, 1920.3, and 2283 mg/g, respectively, for extraction of MB molecules. It is established that, during the absorption of MB molecules, carbonization affects significantly the contact time. Carbonized samples exhibit high sorption activity, which results in the equilibrium contact time of 15 min (this value is 60 min for noncarbonized samples). The equilibrium time during the adsorption of Pb²⁺ ions is 60 min for all samples. The adsorption kinetics is described using the following models: the pseudo-first-order model, pseudo-second-order model, Elovich model, and intraparticle diffusion model. It is found that the adsorption process is limited by the chemical-exchange reaction and runs in a mixed-diffusion mode.

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基于可再生资源的水热合成高效碳吸附剂

摘要开发了一种通过水热碳化葵花籽粉（HTS）并添加氧化石墨烯（GO）和后续碳化（C）合成新型吸附材料的技术。为了评估碳化过程中的形态和相变，对材料进行了扫描电子显微镜和红外光谱表征。根据所获得的结果，碳化促进了潜在孔隙率的发展，并减少了含氧基团和烷基基团的数量。此外，还以萃取 Pb2+ 离子和有机染料分子（亚甲基蓝 (MB)）为例进行了动力学吸附研究。实验结果表明，HTS、HTS/C、HTS/GO 和 HTS/GO/C 复合材料对 Pb2+ 离子的吸附容量分别为 82.9、108.6、168.9 和 148.3 mg/g，对 MB 分子的吸附容量分别为 1481.8、1601.1、1920.3 和 2283 mg/g。这表明，在吸收甲基溴分子的过程中，碳化会显著影响接触时间。碳化样品具有很高的吸附活性，因此平衡接触时间为 15 分钟（未碳化样品的平衡接触时间为 60 分钟）。所有样品吸附 Pb2+ 离子的平衡时间均为 60 分钟。吸附动力学采用以下模型进行描述：伪一阶模型、伪二阶模型、埃洛维奇模型和颗粒内扩散模型。结果发现，吸附过程受到化学交换反应的限制，并以混合扩散模式运行。

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来源期刊

Technical Physics Letters 物理-物理：应用

CiteScore

1.50

自引率

0.00%

发文量

审稿时长

2-4 weeks

期刊介绍： Technical Physics Letters is a companion journal to Technical Physics and offers rapid publication of developments in theoretical and experimental physics with potential technological applications. Recent emphasis has included many papers on gas lasers and on lasing in semiconductors, as well as many reports on high Tc superconductivity. The excellent coverage of plasma physics seen in the parent journal, Technical Physics, is also present here with quick communication of developments in theoretical and experimental work in all fields with probable technical applications. Topics covered are basic and applied physics; plasma physics; solid state physics; physical electronics; accelerators; microwave electron devices; holography.