Bi_2S_3-BiOCl/煤矸石复合光催化剂的制备及光催化性能

以表面改性煤矸石粉、Bi(NO_3)_3·5H_2O和NH_4Cl为原料,采用超声化学法制备了BiOCl/煤矸石前驱体;并通过BiOCl/煤矸石前驱体和硫代乙酰胺(TAA)的阴离子交换反应,原位制备了Bi_2S_3-BiOCl/煤矸石复合光催化剂。利用XRD和SEM对Bi_2S_3-BiOCl/煤矸石复合光催化材料的结构及表面形貌进行了表征,并以可见光为光源,甲基橙为目标降解物,对其光催化活性进行了研究。结果表明:在可见光辐照下,Bi_2S_3-BiOCl/煤矸石复合光催化剂表现出较高的光催化降解能力,这是由于Bi_2S_3与BiOCl复合后形成的异质结促进了光生电子和光生空穴的分离,抑制了它们的复合。

Preparation and photocatalytic properties of Bi2S3-BiOCl/coal gangue composite photocatalysts

BiOCl/coal gangue precursor was prepared by using sonochemical method with the raw materials of modified coal gangue,Bi(NO3)·5H2O and NH4Cl.Bi2S3BiOCl/coal gangue composite photocatalysts were in-situ synthesized through an anion exchange reaction between BiOCl/coal gangue precursor and thioacetamide (TAA).The crystal structure and morphology of Bi2S3-BiOCl/coal gangue composite photocatalysts were investigated by XRD and SEM.The photocatalytic activity of the as-prepared sample was evaluated by degradation of methyl orange under visible light.The results show that the Bi2S3-BiOCl/coal gangue composite photoeatalysts exhibit an pronounced photocatalytic activity.The high photocatalytic activity could be mainly attributed to the formation of the hetero structures between Bi2S3 and BiOCl,which effectively separate the photoinduced electron-hole pairs and suppress their recombination.