Abstract
The thermal degradation of some sulfonic cationites namely Amberlite IR-120, Indion-223 and In-dion-225 was investigated using instrumental techniques like thermal analysis (TG) and Scanning Electron Microscopy (SEM). Fourier Transform Infrared Spectroscopy (FTIR) was used to characterize the resins degradation steps. The sulfonic cationites undergo degradation through dehydration, followed by decomposition of sulfonic acid functional groups liberating SO2. The thermogravimetric analysis of above cationites at higher temperature up to 520oC, show mass loss of 61.61% and 25.43% respectively for Indion-223 and Indion-225, while Amberlite IR-120 cationite get burned off completely.
Highlights
Ion-exchange resins are produced and commercialized in a wide range of formulations with different characteristics, and have a large practical applicability in various industrial processes, such as chemical, and nuclear industry for treatment of liquid waste [1-16]
The following commercial cationites were used: · Strongly acidic gel-type resin with sulfonic acid functionality based on styrene-divinylbenzene matrix: Amberlite IR-120 (Rohm and Haas Co, USA). · Nuclear grade strongly acidic gel-type resin with sulfonic acid functionality based on styrene-divinylbenzene matrix: Indion-223 (Ion Exchange India Ltd., Mumbai). · Strongly acidic gel-type resin with sulfonic acid functionality based on styrene-divinylbenzene matrix: Indion-225 (Ion Exchange India Ltd., Mumbai)
Since in the thermal analysis, the major weight loss was observed between 200 ̊C - 400 ̊C, the resin samples were heated in an oven for 3h at 10 ̊C higher temperatures above the maximum operating temperature, and at 200 and 400 ̊C
Summary
Ion-exchange resins are produced and commercialized in a wide range of formulations with different characteristics, and have a large practical applicability in various industrial processes, such as chemical, and nuclear industry for treatment of liquid waste [1-16] For their versatile properties, the cationic resins are used both in the ion exchange area and in the heterogeneous catalysis field [17]. The cationic resins, produced with a high degree of purity, became important as catalysts in various food technologies [18] and for purification in heavy-water moderated nuclear reactors in nuclear industries [19-21]. In many cases their use is limited by the relatively low thermal stability [22]. In the present investigation thermal degradation of strongly acidic sulfonic cationites was performed to understand the degradation steps and to compare the relative thermal stability
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