Adsorption of strontium (II) metal ions using phosphonate-functionalized polymer

Abstract

Diethyl[3-(methoxydimethylsilyl)propyl]phosphonate (DMPP) polymer was synthesized for the strontium (II) metal ion recovery using diethylallylphosphonate as staring material. Diethylallylphosphonate was reacted with poly(methylhydro)siloxane (MW 1900-2000 g mol −1) in the presence of Speier's catalyst. The synthesized monomer was characterized by IR, 1 H NMR, 13 C NMR and FT-IR spectroscopy techniques, and the synthesized polymers were characterized by IR and NMR spectroscopy, differential scanning calorimetry, thermogravimetric analysis and solubility. The synthesized polymer was used for sequestering strontium metal from the aqueous solution. The metal binding was examined by the energy dispersive spectroscopy and scanning electron microscopy for the adsorbed Sr(II). Batch adsorption studies were performed by varying three parameters, namely initial pH, adsorbent dose and the contact time. The reaction kinetics was determined by the Langmuir, Freundlich, and pseudo-firstand second-order models. Results of this study indicate that the synthesized polymer DMPP has been effective in removing Sr(II) from the aqueous solution.

Polymer sequestrants for biological and environmental applications

“…Additionally, recovering and recycling these materials maximize efficiency and limit cost. Current methods of wastewater treatment for radionuclides include filtration, precipitation, adsorption, membrane separation processes, electrochemical techniques and chemical reactions …”

“…A maximum adsorption of 50% was observed at pH 3. The Sr(II) ion uptake varied directly with polymer concentration, showing a maximum adsorption of 0.015 mg of Sr(II) per milligram of polymer …”

An alternative C–P cross-coupling route for the synthesis of novel V-shaped aryldiphosphonic acids

“…Phosphonates and phosphonic acids are a very interesting class of compounds and examples of their use can be found in a number of different areas, including pharmaceuticals [ 1 – 6 ], metal chelation [ 7 – 9 ], anti-corrosion coatings [ 10 – 12 ], fertilizers [ 13 – 14 ], proton conduction [ 15 – 17 ], and catalysis [ 18 ], amongst others. Phosphonates can also be employed as organic linkers in combination with metal ions to afford coordination polymers and metal-organic frameworks (MOFs), or more aptly, metal phosphonate frameworks [ 19 – 20 ].…”

An improved C-P cross-coupling route for the synthesis of novel V-shaped aryldiphosphonic acids

“…Phosphonates and phosphonic acids are a very interesting class of compounds and examples of their use can be found in a number of different areas, including pharmaceuticals [1][2][3][4][5][6], metal chelation [7][8][9], anti-corrosion coatings [10][11][12], and fertilisers [13][14], amongst others. Phosphonates can also be employed as organic linkers in combination with metal ions to afford coordination polymers and metalorganic frameworks (MOFs), or more aptly, metal phosphonate frameworks.…”