Effect of Activated Carbon Fiber Properties on Ca2+ Removal by Capacitive Deionization

Qing Jun Gao; Xue Xin Liu; Lei Yuan; Kai Zhang

doi:10.4028/www.scientific.net/AMM.700.281

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 700Effect of Activated Carbon Fiber Properties on...

Effect of Activated Carbon Fiber Properties on Ca²⁺ Removal by Capacitive Deionization

Abstract:

Three activated carbon fibers, namely Sample A, B, and C, were used as electrodes for Ca²⁺ removal by capacitive deionization in this study. The physical properties of ACFs were comprehensively investigated with regard to surface area, pore volume, pore size distribution, specific capacitance, and contact angle. An internal correlation was intended to reveal between the ACF properties and their CDI performance. Pseduo-first-order adsorption kinetics model could successfully depict the Ca²⁺ removal with different ACF electrodes. Based on the fitting parameters, Sample B with the highest pore volume, specific capacitance, and hydrophilicity exhibited the highest equilibrium electrosorption capacity (9.977 mg-Ca²⁺/g-ACF). However, Sample A with the highest average pore diameter (2.4 nm) has the highest rate constant (0.074/min). Even though the abundant micropores with diameters less than 2 nm created large specific surface area in Sample C, its uptake of Ca²⁺ was not as good as that of Sample A.

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Periodical:

Applied Mechanics and Materials (Volume 700)

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281-285

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.700.281

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Online since:

December 2014

Authors:

Qing Jun Gao*, Xue Xin Liu, Lei Yuan, Kai Zhang

Keywords:

Activated Carbon Fiber, Capacitive Deionization, Hardness Ion Removal, Kinetic

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