基于十二烷基硫酸钠(SDS)、环己烷、异戊醇和水溶液构建的反相微乳液体系,以硝酸银、磷酸二氢钾为原料,通过改变水与表面活性剂物质的量比值(W)调控制备出棒状、纺锤状及四面体状磷酸银(Ag3PO4)纳米材料.利用XRD、SEM、TEM和UV-Vis-DRS光谱对样品结构、形貌以及可见光响应特性进行了表征,探讨了不同形貌Ag3PO4的形成机理,并以次甲基蓝(MB)降解效果评价了样品光催化性能.实验结果表明:制备的系列纳米Ag3PO4均为体心立方结构晶体,其形貌受W值影响明显;Ag3PO4形貌的不同主要由于SDS量的变化改变了含有产物水核的直径与界面膜强度.此外,制备的样品均表现出好的可见光催化降解MB性能,其中,具有完整四面体形貌的Ag3PO4光催化性能最佳,这与其能够裸露出多的{111}晶面有关.
Silver phosphate (Ag3PO4) materials with different nanostructures including rod, cambiform and tetrahe-dron with round edges and corners were synthesized by adjusting the molar ratio (W) of water to surfactant in a reverse microemulsion, which consists of sodium dodecyl sulfate (SDS), isopentyl alcohol, cyclohexane, and aqueous solution, using silver nitrate and potassium dihydrogen phosphate as starting materials. The structure, morphology and visi-ble-light-response of the obtained samples were characterized by XRD, SEM, HRTEM, and UV-Vis-DRS spectra. The formation mechanisms of nanostructured Ag3PO4 were discussed. Moreover, the photocatalytic activity was also eva-luated by means of degradation of organic dye methylene blue (MB) in water. The results show that all the samples have body-centred cubic crystal structure, and the W value has an obvious effect on morphologly of nanostructured Ag3PO4. The varied morphologies can be attributed to the change of diameter and interfacial film strength of water nu-clear influenced by SDS content. In addition, all the obtained samples exhibit excellent efficient photocatalytic activity for the photo-degradation of methylene blue (MB) under visible light irradiation, and the tetrahedral Ag3PO4 with ex-posed many {111} facets exhibits the best photocatalytic activity.
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