Uptake of decontaminating agent from aqueous solution: a study on adsorption behaviour of oxalic acid over Al-MCM-41 adsorbents |
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Authors: | N Gokulakrishnan A Pandurangan T Somanathan P K Sinha |
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Affiliation: | (1) Department of Chemistry, Anna University, Chennai, 600 025, India;(2) Centralized Waste Management Facility, BARC Facilities, Kalpakkam, 603 102, India |
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Abstract: | Hydrothermal method was followed to synthesis the mesoporous Al-MCM-41 (Si/Al = 25, 50, 75 and 100) and Si-MCM-41 molecular
sieves using a cetyltrimethylammonium bromide as a surfactant and the materials were unambiguously characterized by XRD, N2 sorption studies, 27Al MAS-NMR and TEM. The removal of oxalic acid from aqueous solution was studied through an adsorption process because oxalic
acid may cause complexes with radioactive cations during decontamination operation in nuclear industry, which resulting in
interferences in their removal by conventional treatment. Adsorption of oxalic acid over Al-MCM-41 shows the applicability
of Langmuir isotherm and follows first order kinetics. The effects of parameters such as contact time, concentration of oxalic
acid, adsorbents (various Si/Al ratios of Al-MCM-41, Si-MCM-41 and activated charcoal) and pH have been investigated to yield
higher removal of oxalic acid. The percentage of oxalic acid adsorbed per unit gram of adsorbent for Al-MCM-41 at Si/Al = 100,
75, 50 and 25, Si-MCM-41, and activated charcoal are 34.6, 40.9, 51.4, 61.3, 16.1 and 60, respectively. Retainment of crystallinity
and absence of structural collapse of Al-MCM-41 after desorption and adsorption of oxalic acid, respectively has been achieved
in this study. |
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