从晶体生长角度优化高性能磷酸银粉体的合成工艺

Technological parameter optimization for high performance Ag_3PO_4 powders based on crystal growth mechanism

利用简单水热法处理快速沉淀获得的Ag3PO4粉体,从晶体生长角度探讨结晶质量以及比表面积这两个影响粉体光催化性能的重要因素。借助XRD分析手段引入结晶因子ξ来综合评价上述两个因素的影响,并对水热处理工艺进行优化,从而获得高光催化性能的Ag3PO4粉体。研究结果表明,结晶因子ξ值能够准确地评价Ag3PO4粉体的光催化性能,并能有效地优化粉体的合成工艺;ξ值越大时,粉体的光催化性能越好,且当水热处理工艺为148℃,12h时,产物的ξ值最大,其光催化性能最为优异。

A simple hydrothermal route is used to treat the Ag3 PO4 powders obtained by fast precipitation.Two key factors affecting the photocatalytic performance,crystallization qual-ity and specific surface area,are discussed based on crystal growth mechanism.Based on the XRD analysis,the crystallization factorξis introduced to evaluate the two factors,and the technological parameters are optimized for the synthesis of high performance Ag3 PO4 pow-ders.The results show,ξvalue is in good agreement with the photocatalytic performance of Ag3 PO4 powders,and it is very effective for technological parameter optimization.When the powders are treated under 148 ℃ for 12 h,ξvalue is the highest and the powders show excellent photocatalytic performance.