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Title: Effect of solution-ph on methylene blue dye adsorption on hydrogen titanate nanotubes processed via hydrothermal method
Authors: Harsha, N
Shyama, P K
Shukla, S
Keywords: Adsorption capacity
Adsorption equilibrium
Adsorption isotherm
Adsorption kinetics
Issue Date: 2013
Publisher: American Scientific Publishers
Citation: Advanced Science Engineering and Medicine 5(1):63-72;January 2013
Abstract: Hydrothermally processed hydrogen titanate nanotubes (HTN) have been utilized for the removal of methylene blue (MB) dye from an aqueous solution via surface-adsorption mechanism. The HTN have been characterized using different analytical techniques such as the scanning electron microscope (SEM), transmission electron microscope (TEM), selected-area electron diffraction (SAED), X-ray diffraction (XRD), and Brunauer-EmmettTeller (BET) specific surface-area measurement techniques. The amount of MB dye adsorbed on the surface of HTN at equilibrium (qe ) has been examined as a function of contact time, initial dye-concentration, and initial solution-pH. A new model has been proposed to explain the observed variation in qe as a function of above variables. Within the investigated range of initial solution-pH (2.5–11), the MB dye adsorption on the surface of HTN has been observed to follow the pseudo-second-order kinetics with the dye-adsorption capacity of 105 mg • g–1observed at the initial solution-pH of ∼10. The adsorption equilibrium follows the Langmuir isotherm in a highly acidic solution (initial solution-pH ∼ 2.5) and Dubinin-Kaganer-Radushkevich (DKR) isotherm in a highly basic solution (initial solution-pH ∼11); while, within the intermediate range of initial solution-pH (∼7.5 and 10), it exhibits a transition from the Langmuir to DKR isotherm.
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