Insight into the adsorption behaviors of siloxane on activated carbon fibers

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2025-01-27 DOI:10.1016/j.micromeso.2025.113527

Linhong Wen , Jiahao Liu , Junhao Wang , Mengyan Wang , Jianxiao Yang , Yue Liu , Xin Zhang

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Abstract

A series of activated carbon fibers (ACFs) are employed to evaluate the adsorption capacity of octamethylcyclotetrasiloxane (D4). The pore structure and surface chemistry properties are well characterized, and the effects on D4 adsorption are explored. The results suggest that the viscose-based ACFs exhibit the highest dynamic adsorption capacity of 933 mg/g and static adsorption capacity of 656 mg/g at 25 °C. In particular, the D4 adsorption capacity on ACFs is related to the micropore structure of ACFs. In addition, the phenolic hydroxyl group of ACFs also play an important role in the adsorption process. Furthermore, the adsorption behavior obeyed the Freundlich model and that the diffusion of D4 in the pores rather than external diffusion is the rate-determining step during the mass transfer process at low temperature and low D4 concentration. More importantly, ACFs have abundant active sites, and the adsorption kinetics are dominated by adsorption onto active sites.

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活性炭纤维对硅氧烷的吸附行为研究

采用一系列活性炭纤维（ACFs）对八甲基环四硅氧烷（D4）的吸附性能进行了评价。表征了其孔隙结构和表面化学性质，并探讨了对D4吸附的影响。结果表明，在25℃时，粘基ACFs的动态吸附容量最高，为933 mg/g，静态吸附容量最高，为656 mg/g。特别是ACFs对D4的吸附能力与ACFs的微孔结构有关。此外，ACFs的酚羟基在吸附过程中也起着重要作用。低温低D4浓度传质过程中，吸附行为符合Freundlich模型，D4在孔内扩散而非外部扩散是传质过程的速率决定步骤。更重要的是，ACFs具有丰富的活性位点，吸附动力学以在活性位点上的吸附为主。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.