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FTIR spectra of homoionic Fe(III)-montmorillonite clay/pentachlorophenol self-supporting clay film exposed to vacuum as a function of time: 0 (a), 10 (b), 20 (c), 50 (d) and 120 min (e). After obtaining spectrum at t = 120 min, vacuum was closed and water was added to the cell, spectra were collected at 2 (f), 10 (g), 22 (h) and 35 (i) min after exposure to water vapor.
