Effect of Surface-Exposed Chemical Groups on Calcium-Phosphate Mineralization in Water-Treatment Systems Academic Article uri icon


  • Calcium-phosphate-scale formation on reverse osmosis (RO) membranes is a major limiting factor for cost-effective desalination of wastewater. We determined the effects of various organic chemical groups found on membrane surfaces on calcium-phosphate scaling. Langmuir films exposing different functional groups were equilibrated with a solution simulating the ionic profile of secondary effluent (SSE). Surface pressure− area (Langmuir) isotherms combined with ICP elemental analyses of the interfacial precipitate suggested acceleration of calcium-phosphate mineralization by the surface functional groups in the order: PO4> COOH∼ NH2> COOH: NH2 (1: 1)> OH> ethylene glycol. Immersion of gold- coated silicon wafers self-assembled with different alkanethiols in SSE solution showed formation of a hydroxyapatite precipitate by X-ray diffraction and ATR-IR analysis. Data …

publication date

  • September 27, 2010