Ultrafine particles of bismuth(III) compounds in the phase of crosslinked polymers: Precursors for new sorbents and catalysts
✍ Scribed by V. Gutsanu; L. Cojocaru; G. Lisa; G. F. Volodina
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 570 KB
- Volume
- 118
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
In this article, we show that strongly basic anion exchangers (AV-17 and Purolite A-400) are able to retain Bi(III)-containing cations from Bi(NO 3 ) 3 solutions. The sorption isotherms of the cations at 30 and 50 C were obtained. The sorption increased with increasing temperature. Scanning electron microscopy showed that in the polymer phase, ultrafine particles of Bi(III)-containing compounds were formed. On heating (87 C) in water and in an Na 2 SO 4 solution, Bi(III)-containing ultrafine particles became relatively massive. Powder X-ray diffraction showed the existence of the crystalline phase of BiOCl and Bi 2 O 3 on the surface and in the volume of the polymer granules. The behavior of the Bi(III)-containing poly-mer in the HCl, HNO 3 , and H 2 SO 4 solutions (pH 0-2.5) was investigated. The Bi(III)-containing compounds in the polymer phase were stable at pH > 2. The desorption degree of Bi 3þ in the HNO 3 solution was much greater than in the HCl or H 2 SO 4 solutions. Thermogravimetric investigation (in an N 2 atmosphere) in the range 25-1000 C of the Bi(III)-containing polymer was also carried out. The Bi(III)-containing polymer was stable up to 120 C. V