层状多孔氮化碳的光催化降解有机物及机理分析
Study on Photocatalytic Properties and Mechanism of Layered Porous Carbon Nitride for Organic Compound Degradation
郑帅 1陈浩 2马龙渤 2谢亮 1曾玉彬 2杨萍萍 1杜富滢2
作者信息
- 1. 中油(新疆)石油工程有限公司,新疆 克拉玛依 834000
- 2. 武汉大学动力与机械学院,湖北 武汉 430072
- 折叠
摘要
石墨相氮化碳(g-C3N4)因其合适的带隙结构、较好的光响应、稳定的物化属性、低廉的制备价格而备受关注,但是由于材料的比表面积较小、光生载流子分离效率较低,因而展现出较低的光催化活性.以尿素为前驱体合成氮化碳,通过调控合成过程中的温度和压力,通过一步煅烧法直接合成了质地轻薄、表面呈现层状多孔结构的氮化碳,g-C3N4 的比表面积由原本的8.13 m2·g-1 提高到了94.75 m2·g-1,且明显提高了材料的光生载流子分离效率.层状多孔氮化碳(L-CN)在6 min之内对20 mg·L-1的罗丹明B的降解率达到 100%,降解速度是体相g-C3N4 的 7.7 倍,L-CN降解四环素的降解速度是体相g-C3N4 的 3.0 倍,最大降解率达到85%.
Abstract
Graphite phase carbon nitride(g-C3N4)has attracted much attention due to its suitable band gap structure,good photoresponse,stable physicochemical properties,and low preparation price.However,due to its small specific surface area and low photocarrier separation efficiency,the material exhibits low photocatalytic activity.Urea was used as the precursor to synthesize carbon nitride.Through regulating the temperature and pressure in the synthesis process,carbon nitride with thin texture and layered porous surface was directly synthesized by one-step calcination method successfully.As a result,the specific surface area of g-C3N4 was increased from 8.13 m2·g-1 to 94.75 m2·g-1.Moreover,the photogenerated carrier separation efficiency of the material was obviously improved.In the experiment of degradation of organic compound,the degradation rate of 20 mg·L-1 Rhodamine B by layered porous carbon nitride(L-CN)reached 100%within 6 min,and the degradation rate was 7.7 times that of the bulk phase g-C3N4.The degradation rate of tetracycline by L-CN was 3.0 times that of g-C3N4,and the maximum degradation rate reached 85%.
关键词
光催化/g-C3N4/层状多孔/罗丹明B/四环素Key words
Photocatalysis/g-C3N4/Layered porous/Rhodamine B/Tetracycline引用本文复制引用
基金项目
2022年度新疆维吾尔自治区科学技术厅天山英才计划(2022TSYCJC0002)
出版年
2024
NETL
NSTL
万方数据