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Frontiers of Chemical Science and Engineering >> 2017, Volume 11, Issue 3 doi: 10.1007/s11705-017-1646-y

The preparation and performance of lignin-based activated carbon fiber adsorbents for treating gaseous streams

. Key Laboratory of Energy Thermal Conversion and Control (Ministry of Education), School of Energy and Environment, Southeast University, Nanjing 210096, China.. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China.. Brook Byers Institute for Sustainable System, School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0595, USA

Accepted: 2017-05-23 Available online: 2017-08-23

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Abstract

Two types of lignin-based carbon fibers were prepared by electrospinning method. The first was activated with Fe O (LCF-Fe), and the second was not activated with Fe O (LCF). Gas phase adsorption isotherms for toluene on LCF-Fe and LCF were studied. The gas phase adsorption isotherm for 0% RH showed LCF-Fe have about 439 mg/g adsorption capacity which was close to that of commercially available activated carbon (500 mg/g). The Dubinin-Radushkevich equation described the isotherm data very well. Competitive adsorption isotherms between water vapor and toluene were measured for their RH from 0 to 80%. The effect of humidity on toluene gas-phase adsorption was predicted by using the Okazaki et al. model. In addition, a constant pattern homogeneous surface diffusion model (CPHSDM) was used to predict the toluene breakthrough curve of continuous flow-packed columns containing LCF-Fe, and its capacity was 412 mg/g. Our study, which included material characterization, adsorption isotherms, kinetics, the impact of humidity and fixed bed performance modeling, demonstrated the suitability of lignin-based carbon fiber for volatile organic compound removal from gas streams.

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