Preparation of colloidal Sb2O5 and its stability

摘要

Colloidal antimony pentoxide was prepared by oxidation of antimony trioxide with hydrogen peroxide as oxidant and phosphoric acid as stabilizer. Effects of stabilizer, oxidant amount and reaction temperature on the diameter of colloidal particles and their size distribution were discussed. And static electricity effects on colloidal stability were studied by measurement of Zeta potential. Results show that Zeta potential of colloidal Sb2 O5 moves from -30mV to -56.8 mV with the addition of H3 PO4 as the stabilizer, zero point of charge of colloidal H3 PO4-Sb2 O5 moves from pH= 1.85 to more acidic regions, and colloidal H3 PO4-Sb2 O5 is stable in wider pH range. The stable time of colloidal H3 PO4-Sb2 O5 particles without coagulation is more than six months. The size of colloidal particles is smaller and their distribution is narrower by adding H3 PO4 as the stabilizer and decreasing reaction temperature, and the average diameter of H3 PO4-Sb2 O5 particles prepared is 30 nm.