Adsorption characteristics of carbon tetrachloride from aqueous solution onto polyacrylonitrile-based activated carbon fiber

• Published in: Journal of Central South University of Technology. Science & technology of mining and metallurgy Vol. 17; no. 5; pp. 972 - 978
• Main Authors: Liu, Wen-xia, Guan, Bao-hong, Yu, Jie
• Format: Journal Article
• Language: English
• Published: Heidelberg Central South University 01.10.2010
• Subjects: Engineering; Metallic Materials; adsorption; isotherm; breakthrough curve; carbon tetrachloride; kinetics; activated carbon fiber
• ISSN: 1005-9784; 1993-0666
• DOI: 10.1007/s11771-010-0586-1

The isotherm, mechanism and kinetics of carbon tetrachloride (CT) adsorption by polyacrylonitrile-based activated carbon fiber (PAN-ACF) were investigated in batch reactors and a continuous flow reactor, and the regeneration of PAN-ACF was also studied. Freundlich and Dubinin-Radushkevich (D-R) adsorption equations can well describe the adsorption isotherm. CT is mainly adsorbed on the exterior surface of PAN-ACF with low boundary layer effect and rate-controlling step of intra-particle diffusion. The adsorption dynamics in the batch reactor well fits with the pseudo-first-order model, and the breakthrough curves in the continuous flow reactor can be well described by the Yoon-Nelson model. The ACF can be recycled through thermal regeneration, whereas the adsorption capacity decreases from 7.87 to 4.98 mg/g after the fourth regeneration. 78%–94% of CT can be removed from the wastewater of a fluorine chemical plant on a pilot scale, which confirms the efficacy of ACF under industrial conditions. The results indicate that PAN-ACF is applicable to CT removal from wastewater.