A facile surfactant-assisted ion-exchange method has been developed to prepare rhombic dodecahedral Ag3PO4 sub-microcrystals which are ca. 250–600 nm in size through employing uniform Ag2CO3 sub-microrods which are ca. 250–450 nm in diameter and 1–2 μm in length as a precursor for the first time. A series of contrast experiments indicates that the dosages and types of surfactants and different anion sources have a great influence on the formation of the Ag3PO4 rhombic dodecahedra. Based on time-dependent experiments, a reasonable so-called precipitation–dissolution–recrystallization growth mechanism for the Ag3PO4 rhombic dodecahedra has been proposed. The as-prepared sample exhibits higher photocatalytic activity than both commercial TiO2 (P25) and irregular Ag3PO4 particles toward degradation of rhodamine B (RhB) aqueous solution under visible light irradiation. The pseudo-first-order rate constant for RhB photodegradation by the rhombic dodecahedral Ag3PO4 (0.164 min−1) is about 7 and 2.5 times that of P25 and irregular Ag3PO4, respectively.
我们开发了一种简便的表面活性剂辅助离子交换法,通过使用尺寸约为 250-600 nm 的均匀 Ag2CO3 亚微晶来制备菱形十二面体
Ag3PO4 亚微晶。通过使用直径约 250-450 nm 的均匀 Ag2CO3 亚微晶和直径约 250-450 nm 的均匀 Ag2CO3 亚微晶,制备出尺寸约为 250-600 nm 的菱形十二面体 亚微晶。通过使用直径约 250-450 nm、长度为 1-2 μm 的均匀 Ag2CO3 亚微晶作为前驱体,首次获得了尺寸约为 250-600 nm 的 亚微晶。一系列对比实验表明,表面活性剂的用量和类型以及不同的阴离子源对 菱形十二面体的形成有很大影响。根据时间依赖性实验,提出了一种合理的所谓 菱形十二面体的沉淀-溶解-再结晶生长机制。与商用
二氧化钛(P25)和不规则的 颗粒相比,制备的样品在可见光照射下降解
罗丹明 B(RhB)
水溶液的光催化活性更高。菱形十二面体 降解 RhB 的伪一阶速率常数(0.164 min-1)分别是 P25 和不规则 的 7 倍和 2.5 倍。