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<p>Many studies have focused on improving the adsorption capacity and selectivity of activated carbons (ACs), while fewer studies emphasize the correlation between the physical–chemical properties of activated carbon and the adsorption capacity, as well as the activation energy of desorption. To explore the mechanisms behind the elimination of m-xylene, which is one of the major oil gas VOCs species contributing synergistically to O<sub>3</sub> and SOA, a total of six kinds of commercially available ACs made of shell, coal, and wood materials were selected from the market. The characterization results showed that the ACs belonged to the micro-mesoporous structure and possessed good thermal stability. The surface alkaline functional groups were dominant for shell carbon and coal carbon, while the surface acidic oxygen-containing functional groups were rich for wooden carbon. Among them, wooden carbon W-2# had the lowest desorption activation energy, which was conducive to m-xylene desorption. Dynamic adsorption experiments conducted at room temperature (298&#xa0;K) showed that the saturation adsorption capacity towards m-xylene of six ACs agreed well with the results of specific surface area and pore volume. Noteworthy the correlation between pore volume and adsorption capacity was stronger, especially the pore volume in the range of 4.2–6.3&#xa0;nm. Notably, among three oxygen-containing functional groups, the relevance of carboxyl groups to equilibrium adsorption was as high as 0.94 due to the strong Π-electron donor–acceptor effect, which could form a complex with m-xylene to improve the adsorption capacity. Furthermore, m-xylene desorption process was also analyzed for the six ACs materials. The obtained results revealed that the desorption capacity was lower than the adsorption capacity, meanwhile W-2# exhibited the minimum activation energy (2.76&#xa0;kJ/mol) for m-xylene desorption, which is consistent with the fact that the larger of Δd, the worse of the adsorption affinity, and the lower of the activation energy for desorption. In addition, W-2# demonstrated good cyclic stability. Modeling of dynamics and equilibrium fitting revealed that the mechanism of adsorbent-adsorbate interaction was monolayer physical adsorption controlled by inter-particle diffusion during adsorption process.</p>

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Efficient Removal of M-Xylene from Gasoline Vapor Achieved on Activated carbon: Unraveling the Structure-Adsorption Relationship

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Wenjun Liang,
  • Dan Lu,
  • Wei Hu,
  • Jia Liu

摘要

Many studies have focused on improving the adsorption capacity and selectivity of activated carbons (ACs), while fewer studies emphasize the correlation between the physical–chemical properties of activated carbon and the adsorption capacity, as well as the activation energy of desorption. To explore the mechanisms behind the elimination of m-xylene, which is one of the major oil gas VOCs species contributing synergistically to O3 and SOA, a total of six kinds of commercially available ACs made of shell, coal, and wood materials were selected from the market. The characterization results showed that the ACs belonged to the micro-mesoporous structure and possessed good thermal stability. The surface alkaline functional groups were dominant for shell carbon and coal carbon, while the surface acidic oxygen-containing functional groups were rich for wooden carbon. Among them, wooden carbon W-2# had the lowest desorption activation energy, which was conducive to m-xylene desorption. Dynamic adsorption experiments conducted at room temperature (298 K) showed that the saturation adsorption capacity towards m-xylene of six ACs agreed well with the results of specific surface area and pore volume. Noteworthy the correlation between pore volume and adsorption capacity was stronger, especially the pore volume in the range of 4.2–6.3 nm. Notably, among three oxygen-containing functional groups, the relevance of carboxyl groups to equilibrium adsorption was as high as 0.94 due to the strong Π-electron donor–acceptor effect, which could form a complex with m-xylene to improve the adsorption capacity. Furthermore, m-xylene desorption process was also analyzed for the six ACs materials. The obtained results revealed that the desorption capacity was lower than the adsorption capacity, meanwhile W-2# exhibited the minimum activation energy (2.76 kJ/mol) for m-xylene desorption, which is consistent with the fact that the larger of Δd, the worse of the adsorption affinity, and the lower of the activation energy for desorption. In addition, W-2# demonstrated good cyclic stability. Modeling of dynamics and equilibrium fitting revealed that the mechanism of adsorbent-adsorbate interaction was monolayer physical adsorption controlled by inter-particle diffusion during adsorption process.