Abstract: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 Sb2O5moves from -30 mV to -56.8 mV with the addition of H3PO4as the stabilizer, zero point of charge of colloidal H3PO4-Sb2O5moves from pH=1.85 to more acidic regions, and colloidal H3PO4-Sb2O5is stable in wider pH range. The stable time of colloidal H3PO4-Sb2O5particles without coagulation is more than six months. The size of colloidal particles is smaller and their distribution is narrower by adding H3PO4as the stabilizer and decreasing reaction temperature, and the average diameter of H3PO4-Sb2O5particles prepared is 30 nm.

Key words: clloidal antimony pentoxide stability; Zeta potential; zero point of charge