Interaction of Fluoride Ions and Ground Glass

Abstract

A study of loss of fluoride ions, when solutions of fluorides are kept or concentrated in containers of borosilicate or soft glass, showed that fluoride ions are either adsorbed on the surface of the glass or bound on the lattice.The interacted fluorine ions are partially released when the glass is treated with dilute acid solutions containing ferric ion, and are completelyreleased by dilute sodium hydroxide solutions.

Synthesis of Mg/Al Layered Double Hydroxides for Adsorptive Removal of Fluoride from Water: A Mechanistic and Kinetic Study

“…Polypropylene conical flasks were used instead of glass vessels to avoid possible interaction of fluoride with glass as reported earlier. 28 The mixture was agitated in a thermostatic water bath shaker (NSW, Mumbai, India) at a constant speed of 200 rpm for a predetermined time interval. The adsorbents were then separated from the mixture by centrifugation at 10 000 rpm for 15 min, and the amount of fluoride remaining unadsorbed in the supernatant solution was determined spectrophotometrically (Agilent Cary60 spectrophotometer) using the SPADNS method.…”

“…The fluoride adsorption experiments were carried out in a 100 mL plastic conical flask by mixing a fixed amount of adsorbent with 10 mL of aqueous fluoride solution. Polypropylene conical flasks were used instead of glass vessels to avoid possible interaction of fluoride with glass as reported earlier . The mixture was agitated in a thermostatic water bath shaker (NSW, Mumbai, India) at a constant speed of 200 rpm for a predetermined time interval.…”

Formation of nanostructured silicas through the fluoride catalysed self-polymerization of Q-type functional silica cages

“…Silica (SiO 2 ) itself is usually chemically inert to F À salts, even with association. 24 Therefore, we expect that the cage itself would remain intact (Fig. 2a).…”