Ultrafine particles of bismuth(III) compounds in the phase of crosslinked polymers: Precursors for new sorbents and catalysts

• Published in: Journal of applied polymer science 2010-12, Vol.118 (5), p.2674-2681
• Main Authors: Gutsanu, V, Cojocaru, L, Lisa, G, Volodina, G.F
• Format: Article
• Language: English
• Subjects: adsorption; Applied sciences; Cations; Crosslinking; electron microscopy; Exact sciences and technology; Exchange resins and membranes; Forms of application and semi-finished materials; Granular materials; Heating; ion exchangers; Polymer industry, paints, wood; Polymers; Reproduction; Sorption; Technology of polymers; thermal properties; X-ray
• ISSN: 0021-8995; 1097-4628; 1097-4628
• DOI: 10.1002/app.32615

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(NO₃)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 Na₂SO₄ solution, Bi(III)-containing ultrafine particles became relatively massive. Powder X-ray diffraction showed the existence of the crystalline phase of BiOCl and Bi₂O₃ on the surface and in the volume of the polymer granules. The behavior of the Bi(III)-containing polymer in the HCl, HNO₃, and H₂SO₄ 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 Bi³⁺ in the HNO₃ solution was much greater than in the HCl or H₂SO₄ solutions. Thermogravimetric investigation (in an N₂ 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.