焙烧条件对热聚合法制备石墨相氮化碳光催化性能的影响及其机理  

EFFECTS OF CALCINATION CONDITION ON PHOTOCATALYTIC PROPERTY OF G-CN PREPARED THROUGH THERMAL POLYMERIZATION AND ITS MACHANISM

作　　者：赵芳玉 胡筱敏[1] 郭鹏瑶 ZHAO Fang-yu;HU Xiao-min;GUO Peng-yao(College of Resources and Civil Engineering,Northeast University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,沈阳110819

出　　处：《环境工程》2021年第5期55-60,70,共7页Environmental Engineering

摘　　要：以三聚氰胺、硝酸为原料,采用热聚合法制备石墨相氮化碳(g-C_(3)N_(4)),研究了不同焙烧温度对石墨相氮化碳光催化性能的影响。利用扫描电镜(SEM)、X射线衍射(XRD)、X射线光电子能谱仪(XPS)、傅里叶变换红外光谱(FT-IR)、紫外-可见漫反射(UV-Vis DRS)以及光致发光光谱(PL)等技术对石墨相氮化碳样品的形貌、化学组成、晶体结构等理化性质进行表征,通过光催化降解实验探究石墨相氮化碳的催化活性。实验结果表明:当焙烧温度为550℃时,制备的石墨相氮化碳样品光催化性能最好。当催化剂投加量为0.04 g时,可见光照射50 min后,对50 mL浓度10 mg/L的罗丹明B(RhB)溶液的降解效率可达到91.7%。适宜的焙烧温度能够使光催化剂的光吸收能力增强,并促进光生电子(e^(-))和空穴(h^(+))分离。In this paper, graphite phase carbon nitride was prepared by thermal polymerization process using melamine and dilute nitric acid as raw materials. Effects of calcination temperature on the photocatalytic activity to degradation of Rhodamine B(RhB) of the graphite phase carbon nitride were researched. Their morphologies, crystal structure, chemical composition of as prepared graphite phase carbon nitride were characterized by means of SEM, X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectroscopy(FT-IR), UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS) and photoluminescence spectra(PL). The photocatalytic performance of g-C_(3)N_(4) was tested by photo-decomposition of RhB and the experiment result manifested that the prepared graphite phase carbon nitride samples showed best photocatalyst property when the calcination temperature was 550℃. The degradation rate of RhB in 50 min was about 91.7% after 50 min irradiation under visible light with the dosage of photocatalyst at 0.04 g. Appropriate calcination temperature would be beneficial to enhance light absorption capacity and promote the separation of photogenerated electrons(e^(-)) and holes(h^(+)).

关 键 词：焙烧温度 热聚合法 石墨相氮化碳 光催化剂 罗丹明B 

分 类 号：X703[环境科学与工程—环境工程] O644.1[理学—物理化学] O643.36[理学—化学]