An efficient removal of heavy metal ions in water by photocatalysis

研究了钛氧化物（Ti0_2,BaTi_40_9）与α-FeOOH细颗粒复合的光电沉积对铅离子的去除效果。这些材料在光照射下对铅离子表现出较高的光电沉积能力。结果表明，α-FeOOH细颗粒与氧化物颗粒的共存有助于光辐照产生的空穴和电子的有效分离。高分辨率扫描电镜观察表明，细小的α-FeOOH颗粒支撑在氧化物颗粒表面，有利于空穴与电子之间的电荷分离。提出了一种有效去除水中有害重金属离子的可能机理

The photoelectrodeposition effect of titanium oxides(Ti0_2，BaTi_40_9) combined with α-FeOOH fine particles on the removal of lead ions has been investigated. These matelials showed a high photoelectrodeposition ability for lead ions tmder the photo inadiation. The present result indicates that the coexistence of fine α-FeOOH fine particles with the oxide particles contributes to an efficient separation of holes and electrons generated by the photo irradiation. The high-resolution scanning electron microscopic observation revaled that fine α-FeOOH palticles supported on the surface of the oxide particles are effective for the charge separation between holes and electrons. A possible mechanism for the efficient removal of hazardous heavy metal ions dissolved in an aqueous environment is presented