Bi^(3+)掺杂Ag_3PO_4多面体的水热合成及其光催化性能

Hydrothermal Synthesis and Photocatalytic Activity of Bi^(3+)-doped Polyhedral Ag_3PO_4

采用水热法制备了Ag_3PO_4以及Bi^(3+)离子掺杂的多面体Ag_3PO_4光催化剂,通过XRD、SEM、紫外漫反射、光致发光光谱等对其结构、形貌、吸光特性进行了表征.以亚甲基蓝溶液为模拟废液考查了其光催化活性,探讨了掺杂不同量的Bi^(3+)离子对产物催化性能的影响.结果表明:Bi^(3+)掺杂后的样品为立方晶相多面体状Ag_3PO_4,由于Bi^(3+)在Ag_3PO_4禁带内形成杂质能级,Bi^(3+)掺杂Ag_3PO_4样品吸收带边红移,降低禁带能量,提高了光生电子一空穴对的分离效率.0.08g样品经过可见光催化降解200 mL (8mg/L)的亚甲基蓝溶液6 min后,掺杂2%Bi^(3+)的Ag_3PO_4样品其降解率为93.41%,三次循环降解后,降解率达90.34%.

The Bi3+-doped Ag3PO4 polyhedral photocatalyst was synthesized by hydrothermal method;and characterized by XRD, SEM, UV-Vis DRS and PL. The photocatalytic activity of Ag3PO4 doped Bi3+ with different molarmass was tested by the photocatalytic degradation of methylene blue aqueous solution. The results showed that the synthesized samples were pure cubic polyhedral Ag3PO4. The Bi3+-doped polyhedral Ag3PO4 samples exhibit a visible-light absorption capability much higher than undoped Ag3PO4;which mainly due to the doping process with the formation of new energy level of Bi3+ between conduction band and valence band of Ag3PO4 to reduce the energy gap and the electron-hole recombination rate. The degradation rate of methylene blue can reached 93.41%;using 0.08 g 2% Bi3+-doped Ag3PO4;as the initial methylene blue was 200 ml( 8 mg/L);illumination time was6 min;and 90.34% after cycled for three times.