Synthesis and characterization of activated carbon from Asphodelus microcarpus in two steps

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-11-29 DOI:10.4314/bcse.v38i1.15

Ourred Mohammed, Kaid Mhamed, Merine Houaria

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Abstract

The aim of the present work was to prepare an activated carbon from new precursor Asphodelus microcarpus using KOH as an impregnating agent, in two steps and in the absence of nitrogen. Its preparation requires a pre-carbonization at 500 °C for 60 min in order to obtain the char. Then activation of the char is realized by using KOH using as activating agent variable impregnation ratio: char/activating agent. Calcination is then carried out at 750 °C and 850 °C for 1 hour without azote. The determination of the optimum conditions is carried out by measuring the iodine number and that of methylene blue. The characterization of the chosen product is carried out by the following techniques: BET, FTIR-ATR, SEM and DRX. Under optimum conditions with mass ratio 1:4 at 750 °C (the calcination temperature), the specific surface area is equal to 1025.75 m2.g-1 and we obtain micro-meso activated carbon. The adsorption kinetics of dye chosen agrees with the pseudo-second-order model, and it appears that Freundlich (two parameters model) and Redlich-Peterson (three parameters model) describe better the adsorption data. Error analysis also showed that the Freunlich model better described the adsorption of Eriochrome Black T compared with the three parameter models. KEY WORDS: Asphodelus microcarpus, Two-stage activation process, Chemical activation, Adsorption, Dye Bull. Chem. Soc. Ethiop. 2024, 38(1), 199-212. DOI: https://dx.doi.org/10.4314/bcse.v38i1.15

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分两步从小檗中合成活性炭并确定其特性

本研究的目的是使用 KOH 作为浸渍剂，在无氮条件下分两步从新的前驱体 Asphodelus microcarpus 中制备活性炭。制备过程需要在 500 °C 下预碳化 60 分钟，以获得炭。然后使用 KOH 作为活化剂，以不同的浸渍比例（炭/活化剂）对炭进行活化。然后在 750 °C 和 850 °C 下煅烧 1 小时，不使用偶氮。通过测量碘值和亚甲基蓝的碘值来确定最佳条件。通过以下技术对所选产品进行表征：BET、FTIR-ATR、SEM 和 DRX。在 750 °C （煅烧温度）、质量比为 1:4 的最佳条件下，比表面积等于 1025.75 m2.g-1，我们得到了微米级活性炭。所选染料的吸附动力学符合伪二阶模型，Freundlich（二参数模型）和 Redlich-Peterson（三参数模型）似乎能更好地描述吸附数据。误差分析也表明，与三参数模型相比，Freundlich 模型能更好地描述褐变黑 T 的吸附情况。关键词：Asphodelus microcarpus、两阶段活化过程、化学活化、吸附、染料 Bull.Chem.Soc.2024, 38(1), 199-212.DOI: https://dx.doi.org/10.4314/bcse.v38i1.15

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.