Sol synthesis from zirconyl chloride octahydrate in NTA-ammonia solution

Add time:08/04/2019    Source:sciencedirect.com

This work first synthesized sol of the precursor of zirconium oxide by reacting zirconyl chloride octahydrate (ZrOCl2 · 8H2O) with nitrilotriacetic acid (NTA) in ammonia solution. NTA (R(COO−)n), acts as the complex compound, reacts with ammonium hydroxide to produce an ionized complex agent R(COO−)n. Reaction of ZrOCl2 · 8H2O and R(COO−)n was achieved through sequential hydrolysis and condensation, i.e., tetramer product ([Zr4(OH)8(OH2)16]8+) was produced via hydrolysis and a large complex molecule ([Zr4(OH)8 − n(OH2)16(−OOC)nR]8+ or [Zr4(OH)8(OH2)16 − n(OOC-)nR]8+) was generated via condensation. In addition, the effects of the reaction conditions including the temperature, the molar concentration of ZrOCl2 · 8H2O, the amount of ammonia and the agitation speed on the average size of sol particle and the viscosity of the sol were investigated. Rational reaction mechanism, accounting for the formation, growth of the particles, and the viscosity of the sol, was also proposed to satisfactorily account for the experimental results.

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