Near Infrared Spectroscopy of Benzoic Acid Adsorbed on Montmorillonite |
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| Authors: | Longfei Lu Jingong Cai |
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| Affiliation: | 1. Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology , Brisbane, Queensland, Australia;2. State Key Laboratory of Marine Geology, Tongji University , Shanghai, China;3. State Key Laboratory of Marine Geology, Tongji University , Shanghai, China |
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| Abstract: | ABSTRACT The adsorption of benzoic acid on both sodium and calcium montmorillonites has been studied by near infrared spectroscopy complimented with infrared spectroscopy. Upon adsorption of benzoic acid, additional near-infrared bands are observed at 8665 cm?1 and assigned to an interaction of benzoic acid with the water of hydration. Upon adsorption of the benzoic acid on Na-Mt, the NIR bands are now observed at 5877, 5951, 6028, and 6128 cm?1 and are assigned to the overtone and combination bands of the CH fundamentals. Additional bands at 4074, 4205, 4654, and 4678 cm?1 are attributed to CH combination bands resulting from the adsorption of the benzoic acid. Benzoic acid is used as a model molecule for adsorption studies. The application of near-infrared spectroscopy to the study of adsorption has the potential for the removal of acids from polluted aqueous systems. |
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| Keywords: | adsorption benzoic acid montmorillonites near infrared spectroscopy structured water |
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