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石墨相氮化碳负载碳微球光催化性能研究
安徽理工大学材料科学与工程学院,安徽 淮南 232001
Study on Photocatalytic Performance of Graphitic Carbon Nitride Loading Carbon Microspheres
Department of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
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摘要 为了提高石墨相氮化碳(g-C3N4)的光催化性能,将g-C3N4与聚乙烯醇(PVA)溶液共混制备了g-C3N4负载碳微球复合材料,并采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅立叶红外光谱仪(FTIR)和紫外-可见光光度计(UV-Vis)对复合材料进行了表征。将得到的复合材料用于催化降解废水以测试其光催化性能。结果表明,在0.3 g的g-C3N4中添加0.2 mL质量浓度为30 g/L的聚乙烯醇溶液,高温煅烧后能够在g-C3N4片层表面形成碳微球。与原始g-C3N4相比,g-C3N4负载碳微球复合催化剂的光催化亚甲基溶液降解速率明显提高,催化剂CN-0.2的一级降解速率常数为0.047 8 min-1,约为催化剂CN的2.8倍。光催化性能的提高是因为碳微球提高了催化剂对可见光的吸收,增加了复合材料的比表面积和促进了光生电子的转移。
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杨 宽
李慧琴
任欣欣
潘 佳
于清波
关键词 石墨相氮化碳聚乙烯醇碳微球光催化剂    
Abstract:In order to improve the photocatalytic performance of graphitic carbon nitride (g-C3N4), g-C3N4 supported carbon microsphere composites were prepared by blending g-C3N4 with polyvinyl alcohol (PVA) solution. The composites were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier infrared spectroscopy (FTIR) and ultraviolet-visible spectrophotometer (UV-Vis). The composite materials were used to catalyze the degradation of wastewater to test their photocatalytic performance. The results showed that the addition of 0.2 mL of 30 g/L polyvinyl alcohol to 0.3 g g-C3N4 could be used to form carbon microspheres on the surface of the g-C3N4 sheet after high temperature calcination (CN-0.2). Compared with the original g-C3N4 (CN), the photocatalytic degradation rate of the methylene solution catalyzed with the g-C3N4 supported carbon microsphere composite catalyst was obviously improved. The first order degradation rate constant of CN-0.2 was 0.047 8 min-1, about 2.8 times of that of CN. Because the carbon microspheres increased the absorption of visible light by the catalysts, the specific surface area of the composite material was improved and the transfer of photogenerated electronics was promoted.
Key wordsgraphitic carbon nitride    polyvinyl alcohol    carbon microspheres    photocatalyst   
收稿日期: 2019-12-25     
基金资助:国家自然科学基金资助项目(21401001)。
作者简介: 杨 宽(1996—),男,硕士研究生;于清波(1978—),女,教授,通讯联系人。E-mail:24003526@qq.com。
引用本文:   
杨 宽,李慧琴,任欣欣等. 石墨相氮化碳负载碳微球光催化性能研究[J]. 化学反应工程与工艺, 2020, 36(2): 170-176.
YANG Kuan,LI Huiqin,REN Xinxin et al. Study on Photocatalytic Performance of Graphitic Carbon Nitride Loading Carbon Microspheres[J]. 化学反应工程与工艺, 2020, 36(2): 170-176.
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