Impact of pore structure in pitch-based activated carbon fibers on Cr(VI) adsorption behaviors

IF 8.7 Q1 CHEMISTRY, PHYSICAL

Applied Surface Science Advances Pub Date : 2025-09-01 DOI:10.1016/j.apsadv.2025.100835

Su-Bin Kim , Mantae Kim , Jaein Lee , Hokab Choi , Seul-Yi Lee , Soo-Jin Park

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Abstract

Hexavalent chromium (Cr(VI)) is a highly toxic pollutant widely used in various industrial processes, posing serious threats to human health and the environment. Herein, pitch-based activated carbon fibers (PACFs) were synthesized via steam activation of pitch precursors to achieve efficient Cr(VI) removal from aqueous solutions. PACF_800, activated at 800 °C, exhibited an exceptionally high specific surface area (1768 m² g^–1) and a micropore volume of 0.872 cm³ g^–1, accounting for 63.5 % of the total pore volume. The maximum adsorption capacity reached 93.2 mg g^–1 at pH 3, attributed to the synergistic effects of a highly developed microporous network and abundant oxygen-containing functional groups. Adsorption isotherm analysis showed excellent agreement with the Langmuir model (R² > 0.99), indicating a predominant monolayer adsorption mechanism, while kinetic analysis revealed a shift toward pseudo-second-order behavior at higher activation temperatures, consistent with enhanced chemisorption. Furthermore, PACFs demonstrated outstanding reusability, retaining 94.9 % of their initial adsorption capacity after five regeneration cycles. These results highlight the strong potential of PACFs as high-performance adsorbents for Cr(VI) removal in industrial wastewater treatment.

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沥青基活性炭纤维孔结构对Cr（VI）吸附行为的影响

六价铬（Cr(VI)）是一种剧毒污染物，广泛应用于各种工业过程中，对人类健康和环境构成严重威胁。本文通过蒸汽活化沥青前驱体合成了沥青基活性炭纤维（PACFs），以实现水溶液中Cr（VI）的高效去除。PACF_800在800℃活化后，表现出极高的比表面积（1768 m2 g-1），微孔体积为0.872 cm3 g-1，占总孔体积的63.5%。在pH为3时，由于微孔网络高度发达和含氧官能团丰富，吸附量达到93.2 mg g-1。吸附等温线分析结果与Langmuir模型非常吻合（R2 > 0.99），表明主要的单层吸附机制，而动力学分析显示在较高的活化温度下向伪二级吸附行为转变，与增强的化学吸附一致。此外，PACFs表现出出色的可重复使用性，在5次再生循环后仍保持94.9%的初始吸附容量。这些结果突出了PACFs作为工业废水处理中去除Cr（VI）的高性能吸附剂的强大潜力。

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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