Ag_3PO_4溶解热力学函数的晶面效应与温度效应  

Facet and Temperature Effects on Dissolution Thermodynamic Functions of Ag_3PO_4 Microcrystals

作　　者：贺子君 肖明 马祥英 邱江源 肖碧源 覃方红 黄在银 HE Zijun;XIAO Ming;MA Xiangying;QIU Jiangyuan;XIAO Biyuan;QIN Fanghong;HUANG Zaiyin(College of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530008, China;Guangxi Colleges and Universities Key Laboratory of Food Safety and Pharmaceutical Analytical Chemistry, Guangxi University for Nationalities, Nanning 530008, China)

机构地区：[1]广西民族大学化学化工学院,南宁530008 [2]广西民族大学广西高校食品安全与药物分析化学重点实验室,南宁530008

出　　处：《高等学校化学学报》2019年第5期959-964,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21273050;21573048;21873022);广西研究生教育创新计划项目(批准号:gxun-chx2s2018062)资助~~

摘　　要：在室温下制备了立方体{100}、四面体{111}、菱形十二面体{110}和块体Ag3PO4微晶,并进行了表征.测定了其在不同温度下水溶液中的电导率,结合强电解质溶液和溶解热力学理论,得到了Ag3PO4微晶的溶解热力学函数.以具有不同晶面的Ag3PO4微晶为模型,研究了纳米材料溶解热力学函数的晶面效应和温度效应.结果表明,具有{110}晶面的菱形十二面体Ag3PO4的标准摩尔溶解吉布斯自由能(ΔGm—0)、标准摩尔溶解焓(ΔHm—0)和标准摩尔溶解熵(ΔSm—0)最大,具有{100}晶面的立方体Ag3PO4次之,具有{111}晶面的四面体Ag3PO4最小;溶解平衡常数(KSP)和ΔGm—0随着温度的升高而增大.Ag3 PO4 microcrystals with different facets,such as { 100}(cubic),{ 111}(tetrahedron),{ 110}(rhombohedral dodecahedron),and bulk Ag3 PO4 microcrystals were synthesized at room temperature. Based on the difference of the conductivity between Ag3 PO4 microcrystals with different facets,the dissolution thermodynamic function of Ag3 PO4 microcrystals were derived via combining the theoretical formula of strong electrolyte solution and dissolution thermodynamics. According to this method,the dissolution thermodynamic functions such as standard dissolution Gibbs free energy, standard dissolution enthalpy and standard dissolution entropy of the prepared Ag3 PO4 microcrystals were gained. Moreover,the facet effect and temperature effect on these obtained dissolution thermodynamic functions were discussed. The results revealed that the dissolution thermodynamic function of rhombohedral dodecahedron Ag3 PO4 were maximum,followed by cubic and tetrahedron Ag3 PO4. Along with the increase of the temperature,dissolution equilibrium constant and standard dissolution Gibbs free energy increased.

关 键 词：磷酸银 溶解热力学 晶面效应 温度效应 

分 类 号：O645[理学—物理化学]