二甲苯在微纤复合硫掺杂碳纳米管上的吸附过程强化机理研究

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关键词：二甲苯；固定床吸附；硫掺杂碳纳米管；无效床层厚度；Yoon-Nelson模型 中图分类号：TQ424 文献标志码：A DOI：10.3969/j.issn.1003-9015.2025.03.004

Mechanistic study on the enhanced adsorption of xylene on sulfur doped carbon nanotube membrane coated paper-like stainless steel fibers

ZHUANG Chaojun¹， YAN Ying1，² （1.School of Chemistryand Chemical Engineering，South China University of Technology，Guangzhou 510640，China；2.SCUT-Zhuhai Institute of Modern Industrial Innovation，Zhuhai 519175，China）

Abstract：Carbon nanotubes（CNT）are widelyregardedaseffctive adsorbents forvolatile organic compounds （VOCs）due to their exceptional physical properties.However，the adsorption performance of CNTs is often hindered by masstransfer resistance causedby aggregation effects.Microfiber composites，as anovel structural materials，effctively overcome this limitation.In this study，CNTand sulfur-doped CNT（SCNT）membrane weredirectlygrown onthe surface of paper-like sintered stainless steel fibers（PSSF）via chemical vapor deposition（CVD）， successfully fabricating CNT/PSSF and SCNT/PSSF compositeswith gradient porous structures.These composites were thoroughly characterized using SEM，TEM，TG，Raman，FT-IR，and XPS.Adsorption experiments in a fixed-bed reactor demonstrated that SCNT/PSSF exhibited superior dynamic adsorption performance，atributed to the abundant surface defects and acid-base functional groups.By constructing a mixed structurd fixed bed with granular CNT bed and SCNT/PSSF bed，the masstransfer enhancement mechanism during xylene adsorption was investigated. Compared to a 5 cm granular CNT bed，the utilization efficiency（ ΔZ ）of the 4 cm granular CNT +∣ cm SCNT/PSSF bed was improved by 8.1% ． Additionally，the adsorption process in the structured fixed bed was well-fitted by the Yoon-Nelsonmodel.

Key words：xylene；adsorption in fixed bed；sulfur doped carbon nanotube；length of unused bed；YoonNelson model

1前言

挥发性有机化合物（VOCs）通常来源于各种日常生活和工业活动，如汽车尾气、石油冶炼和家具生产等[1-2]。（剩余18115字）