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采用超声工艺与硫酸水热改性相结合,在无模板剂条件下制备出多孔g-C3N4材料。通过粒径分析、X射线衍射仪、扫描电镜、比表面积测试和紫外-可见漫反射光谱等表征手段,系统研究了超声时间、水热条件等对其粒径大小、晶体结构、表面形貌、孔结构以及光吸收性能的影响,并考察了超声处理和水热改性g-C3N4对甲基橙和罗丹明B的可见光催化行为。结果表明:超声处理与水热改性工艺结合有利于提高g-C3N4材料多孔性,增强其对污染物的吸附能力,并在一定程度上提高光生载流子的分离-转移效率,从而提高了g-C3N4的可见光催化活性。
The porous g-C3N4 material was prepared in the absence of templating agent by the combination of ultrasonic and hydrothermal modification of sulfuric acid. Through particle size analysis, X-ray diffraction, scanning electron microscopy, specific surface area measurement and UV-Vis diffuse reflectance spectroscopy, the effects of ultrasonic time, hydrothermal conditions and so on on the particle size, crystal structure, Pore structure and light absorption properties were investigated. The visible light photocatalytic activity of methyl orange and rhodamine B by sonication and hydrothermally modified g-C3N4 was investigated. The results show that the combination of ultrasonic treatment and hydrothermal modification process is beneficial to improve the porosity of g-C3N4 material and enhance its adsorption capacity for pollutants, and to some extent, improve the separation-transfer efficiency of photo-generated carriers, Visible photocatalytic activity of g-C3N4.