Diclofenac sodium adsorption in aqueous media by activated carbon obtained from einkorn (Triticum monococcum L.) husk

IF 3 4区工程技术 Q3 CHEMISTRY, PHYSICAL

Adsorption Pub Date : 2024-05-09 DOI:10.1007/s10450-024-00479-2

Barış Kocabıyık, Osman Üner, Ünal Geçgel

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Abstract

The uncontrolled release of waste diclofenac with low biodegradability is considered to be a potential threat for the environment and creatures. To find effective solution for this issue, this study reports the adsorption performance of diclofenac sodium salt (DCF) by using activated carbon (EHAC) obtained from einkorn (Triticum monococcum L.) husk in aqueous solution under various circumstances. It was found that DCF adsorption on EHAC was highly solution pH dependent, and DCF adsorption by EHAC decreased with increasing adsorption temperature. Equilibrium data showed that fitted isotherm model with the experiment results of DCF adsorption on EHAC followed the order of Langmuir > Temkin > Freundlich > Dubinin-Radushkevich. Adsorption capacity of EHAC for DCF adsorption in aqueous solution was calculated to be 147.06 mg/g at 25 °C. The adsorption kinetic of DCF adsorption on EHAC was determined to obey the pseudo-second-order kinetic model. By utilizing FTIR and pH data obtained from DCF adsorption on EHAC, DCF adsorption mechanisms with some interactions such as π-π stacking, electrostatic interactions, and hydrogen bonding were suggested at diverse pH values. Additionally, intraparticle diffusion model was applied to kinetic results to further recognize the kinetic mechanism of DCF adsorption on EHAC. Furthermore, thermodynamic parameters for DCF adsorption on EHAC were calculated and evaluated, in which DCF adsorption process by EHAC was determined to be exothermic, spontaneous, and feasible.

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从裸麦（Triticum monococcum L.）谷壳中提取的活性炭在水介质中对双氯芬酸钠的吸附作用

生物降解性低的废物双氯芬酸的无节制释放被认为是对环境和生物的潜在威胁。为了找到解决这一问题的有效方法，本研究报告了在不同条件下，使用从裸麦（Triticum monococcum L.）谷壳中提取的活性炭（EHAC）在水溶液中对双氯芬酸钠（DCF）的吸附性能。研究发现，DCF在EHAC上的吸附与溶液的pH值高度相关，且EHAC对DCF的吸附随吸附温度的升高而降低。平衡数据表明，DCF在EHAC上的吸附实验结果与等温线模型的拟合顺序为Langmuir > Temkin > Freundlich > Dubinin-Radushkevich。在 25 °C 时，计算得出 EHAC 在水溶液中吸附 DCF 的吸附容量为 147.06 mg/g。确定了 DCF 在 EHAC 上的吸附动力学符合假二阶动力学模型。利用傅立叶变换红外光谱和 EHAC 上 DCF 吸附的 pH 值数据，提出了 DCF 在不同 pH 值下的π-π 堆积、静电作用和氢键等相互作用的吸附机理。此外，还将粒子内扩散模型应用于动力学结果，以进一步认识 DCF 在 EHAC 上吸附的动力学机制。此外，还计算和评估了 DCF 在 EHAC 上吸附的热力学参数，确定了 DCF 在 EHAC 上的吸附过程是放热、自发和可行的。

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来源期刊

Adsorption 工程技术-工程：化工

CiteScore

8.10

自引率

3.00%

发文量

审稿时长

2.4 months

期刊介绍： The journal Adsorption provides authoritative information on adsorption and allied fields to scientists, engineers, and technologists throughout the world. The information takes the form of peer-reviewed articles, R&D notes, topical review papers, tutorial papers, book reviews, meeting announcements, and news. Coverage includes fundamental and practical aspects of adsorption: mathematics, thermodynamics, chemistry, and physics, as well as processes, applications, models engineering, and equipment design. Among the topics are Adsorbents: new materials, new synthesis techniques, characterization of structure and properties, and applications; Equilibria: novel theories or semi-empirical models, experimental data, and new measurement methods; Kinetics: new models, experimental data, and measurement methods. Processes: chemical, biochemical, environmental, and other applications, purification or bulk separation, fixed bed or moving bed systems, simulations, experiments, and design procedures.