Abstract
In the adsorption of electron-donating compounds such as phenol, aniline,L-phenylalanine, andL-tyrosine from aqueous solution, irreversibility was observed on activated carbon and graphite. The compounds, exceptL-tyrosine, were reversibly adsorbed on a synthetic adsorbent. In the case where the carbonaceous adsorbents contacted the aqueous solution containing electron-donating compounds for a long time, the irreversible amount adsorbed increased with the contact time. A two-state adsorption model was used to explain why the irreversible adsorption of electron-donating compound appears in aqueous solution. First, the compound is adsorbed in theprecursor statefor irreversible adsorption, and then moves into itsirreversible stateover a potential energy barrier after a long contact time. The appearance of irreversible adsorption was qualitatively explained by the two-state adsorption model.
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