| GO/TiO2-g-C3N4纳米复合材料的制备及可见光催化性能 |
| Preparation and Photocatalytic Properties of GO/TiO2-g-C3N4 Nanocomposites |
| 作者 | 单位 | E-mail | | 胡金娟 | 大连理工大学物理学院, 三束材料改性教育部重点实验室, 大连 116024 | | | 马春雨 | 大连理工大学物理学院, 三束材料改性教育部重点实验室, 大连 116024 | chunyuma@dlut.edu.cn | | 王佳琳 | 大连理工大学物理学院, 三束材料改性教育部重点实验室, 大连 116024 | | | 冷超 | 大连理工大学物理学院, 三束材料改性教育部重点实验室, 大连 116024 | | | 秦福文 | 大连理工大学物理学院, 三束材料改性教育部重点实验室, 大连 116024 | | | 张庆瑜 | 大连理工大学物理学院, 三束材料改性教育部重点实验室, 大连 116024 | |
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| 摘要: 以水热法制备的20% g-C3N4/TiO2（20%为质量分数）为基，将其与不同质量分数的氧化石墨烯（GO）复合制备出可见光催化性能优良的GO/TiO2-g-C3N4三元复合材料。利用X射线衍射（XRD）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、紫外-可见漫反射光谱（UV-Vis DRS）、光致荧光光谱（PL）、瞬态光电流响应等分析测试手段对样品的结构、形貌和光电性能进行表征。研究了不同质量分数GO的加入对GO/TiO2-g-C3N4在可见光下降解亚甲基蓝（MB）溶液的影响。结果表明： g-C3N4/TiO2与GO复合后，锐钛矿相TiO2颗粒形成小团簇附着在g-C3N4和GO片层表面，且当GO含量为15%时，TiO2形成的团簇最小，对可见光的吸收最多且光生电子-空穴对的复合率最低。可见光照射下，15% GO/TiO2-g-C3N4复合材料对MB的降解率在3 h内可达98.4%，且其降解速率常数（0.022 4 min-1）分别是纯TiO2（0.001 5 min-1）和g-C3N4/TiO2（0.002 5 min-1）的15倍和9倍。 |
| 关键词: g-C3N4/TiO2 GO 异质结 可见光催化 |
| 基金项目: 中央高校基本科研业务费专项资金（No.DUT19LAB14）资助项目。 |
| Abstract: GO/TiO2-g-C3N4 ternary composites having good visible light catalytic performances, which was based on the prepared 20%g-C3N4/TiO2 composites (the mass fraction of g-C3N4 was 20%) by hydrothermal process, were successfully synthesized by mixing graphene oxide (GO) dispersions with different mass fractions. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), photoluminescence spectroscopy (PL), and transient photocurrent analytical tests are used to characterize and analyze the crystal structures, morphologies and optical properties of g-C3N4/ TiO2-based photocatalysts. The effect of TiO2-g-C3N4 compounded with different GO mass fractions on the degradation of methylene blue (MB) solution under visible light was studied. The results show that with the optimized amount of GO of 15%, the smallest anatase phase TiO2 particles attached to the surface of g-C3N4 and GO sheets was found to be the enhancing photocatalytic efficiency, which can be attributed to higher light absorption and lower photoelectron-hole recombination rate in comparison with g-C3N4/TiO2 binary composites or pure TiO2. The degradation rate of MB by 15%GO/TiO2-g-C3N4 composite could reach 98.4% within three hours, and its degradation rate constant (0.022 4 min-1) was about 15 times and 9 times higher than those of pure TiO2 (0.001 5 min-1) and g-C3N4/ TiO2 (0.002 5 min-1), respectively. |
| Keywords: g-C3N4/TiO2 GO heterojunction visible light catalysis |
| 投稿时间：2020-04-15 修订日期：2020-09-17 |
| 摘要点击次数: 1977 |
| 全文下载次数: 889 |
| 胡金娟,马春雨,王佳琳,冷超,秦福文,张庆瑜.GO/TiO2-g-C3N4纳米复合材料的制备及可见光催化性能[J].无机化学学报,2020,36(12):2240-2248. |
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