Adsorption characteristics of 2,4-dichlorophenoxyacetic acid and 2,4-dinitrophenol in a fixed bed adsorber |
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Authors: | Sung Yong Cho Sook Jin Kim Tae Young Kim Hee Moon Seung Jai Kim |
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Affiliation: | (1) RRC for Photonic Materials and Devices, Chonnam National University, 500-757 Gwangju, Korea;(2) Department of Environmental Engineering, Chonnam National University, 500-757 Gwangju, Korea;(3) Faculty of Applied Chemistry, Chonnam National University, 500-757 Gwangju, Korea |
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Abstract: | The influence of temperature and initial pH of aqueous solution on adsorption has been discussed in detail using the Sips
equation. Single-component adsorption equilibria of 2,4-D and 2,4-DNP dissolved in water have been measured for three kinds
of GACs (F400, SLS103, and WWL). For 2,4-D, the magnitude of adsorption capacity was in the order of F400>SLS103>WWL, and
that for 2,4-DNP was SLS103>F400>WWL. These results may come from the effects of the pore size distribution, surface area,
surface properties, and difference in adsorption affinity. Kinetic parameters were measured in a batch adsorber to analyze
the adsorption rates of 2,4-D and 2,4-DNP. The internal diffusion coefficients were determined by comparing the experimental
concentration curves with those predicted from surface diffusion model (SDM) and pore diffusion model (PDM). The linear driving
force approximation (LDFA) model was used to simulate isothermal adsorption behavior in a fixed bed adsorber and successfully
simulated experimental adsorption breakthrough behavior under various operation conditions. Efficiency of desorption for 2,4-D
and 2,4-DNP was about 80% using distilled water at pH of 6. |
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Keywords: | Adsorption Desorption 2 4-Dichlorophenoxyacetic Acid 2 4-Dinitrophenol Equilibrium Fixed Bed |
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