摘要
以柠檬酸为碳源,3-氨丙基三乙氧基硅烷(APTES)为功能化试剂,乙二醇为溶剂,溶剂热法制备了具有上下转换发光性质的有机硅功能化的碳纳米球(SiCNs)。利用X射线衍射(XRD)、透射电镜(TEM)、红外光谱(FTIR)、X射线光电子能谱(XPS)、紫外可见漫反射光谱(UV-Vis DRS)和光致发光光谱(PL)等对合成的SiCNs进行了表征。结果表明,在APTES与柠檬酸质量比为2.0时,180℃反应5 h可以制备出尺寸分布在30~50 nm之间均一球形的SiCNs。可见光辐射下,以亚甲基蓝(MB)为目标降解物研究了SiCNs样品的光催化降解活性,通过活性物种的分析对催化降解体系的光催化机理进行了探讨。结果表明,可见光照射120 min,SiCNs样品对MB溶液的降解率可以达到99%,经过5次循环使用降解率仍保持在96%以上。SiCNs样品展现了优异的可见光催化活性及良好的稳定性。
Organosilane-functionalized carbon nanospheres （SiCNs）with excellent up-and down-converted photoluminescence properties were prepared by the one-pot solvothermal method in ethylene glycol from citric acid and （3-aminopropyl）triethoxysilane （APTES）. The as-prepared SiCNs were characterized by X-ray powder diffraction （XRD）, transmission electron microscopy （TEM）, Fourier-transform infrared spectroscopy （FTIR）, X-ray photoelectron spectroscopy （XPS）, UV-Vis diffuse reflection spectroscopy （DRS）and photoluminescence spectra （PL）. The results indicate that uniform spherical SiCNs with diameter of about 30~50 nm were synthesized at 180℃ for 5 h when the mass proportion of APTES and citric acid is 2.0. The visible-driven photocatalytic activity of SiCNs toward the degradation of methylene blue （MB）was investigated. The photocatalytic mechanism was discussed based on the active species during photocatlytic process. The results show that after 120 min visible light irradiation, the degradation rate of MB reached 99% by using SiCNs. The decomposition rate of MB was still above 96% even after 5 recycling uses, thus SiCNs show high visible light photocatalytic activity and excellent stability.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2017年第2期299-306,共8页
Chinese Journal of Inorganic Chemistry
基金
辽宁省自然科学基金(No.201602708)资助项目
关键词
碳纳米球
发光
光催化剂
光降解
carbon nanospheres
luminescence
photocatalyst
photodegradation
