Dehydration,Water Vapor Adsorption and Desorption Behavior of Zn[B3O3(OH)5] · H2O and Zn[B3O4(OH)3] |
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| Authors: | Burcu Alp Mehmet Gönen Sevdiye Atakul Savr?k Semra Ülkü |
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| Affiliation: | Chemical Engineering Department , ?zmir Institute of Technology, Engineering Faculty , Gülbah?e, Urla , ?zmir , Turkey |
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| Abstract: | The dehydration behaviors of two different hydrated zinc borate species, ZnB3O3(OH)5] · H2O and ZnB3O4(OH)3], which are industrially important flame retardants, were studied by thermal gravimetric(TG) analysis and in situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. Dehydration onset temperatures of ZnB3O3(OH)5] · H2O and ZnB3O4(OH)3] were 129 and 320°C, respectively, at a 10°C/min ramp rate. A very small amount of boric acid was volatilized in addition to water vapor when both samples were heated at 250°C. A significant amount of water vapor was adsorbed by ZnB3O3(OH)5] · H2O from air at 25°C. However, ZnB3O4(OH)3] adsorbed a very small amount of water under the same conditions. Both zinc borates did not have a tendency to cake during storage. |
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| Keywords: | Caking Dehydration DRIFT spectroscopy Water vapor adsorption Zinc borate |
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