基于衰减全反射LED光谱的g-C3N4对亚甲基蓝表面的吸附
Adsorption of methylene blue surface by g-C3N4 based on attenuated total reflection LED spectroscopy
王思祺 1洪雯雯 1卜义夫 2邵梦莎 1李静怡 1刘思乐1
作者信息
- 1. 沈阳科技学院,辽宁沈阳 110167
- 2. 浙江秦燕科技股份有限公司,浙江绍兴 312000
- 折叠
摘要
以SiO2光导纤维为载体,通过溶胶-凝胶法将g-C3N4负载在SiO2光导纤维表面形成一层均匀的薄膜,采用X射线衍射(XRD)、红外光谱(FT-IR)、扫描电镜(SEM)、瞬态荧光光谱(PL)、荧光电镜(LSCM)、Zeta电位等表征技术对样品进行表征.结果表明:g-C3N4均匀分布在SiO2光导纤维表面,吸附亚甲基蓝分子后Zeta电位由-45.35 mV升高到-28.72 mV;FT-IR光谱中700 cm-1处的吸收峰移动到667 cm-1处,600 cm-1处的吸收峰消失;PL光谱典型发射峰明显下降,这都说明了g-C3N4对亚甲基蓝分子有较好的吸附能力.利用SiO2光导纤维对光全反射的特点并借助衰减全反射光谱原理,以红光LED为光源,光电倍增管为检测器,研究了g-C3N4对亚甲基蓝分子的表面吸附,采用Freundlich等温吸附模型和Langmuir等温吸附模型对实验结果进行了拟合.结果表明:g-C3N4对亚甲基蓝分子的吸附更符合Langmuir等温吸附模型,属于单分子层吸附而非多分子层吸附.
Abstract
With SiO2 photoconductive fiber as the carrier,g-C3N4 was loaded on the surface of SiO2 opti-cal fiber to form a uniform film by sol-gel method.The samples were characterized by X-ray diffraction(XRD),infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),transient fluorescence spectrosco-py(PL),fluorescence electron microscopy(LSCM),Zeta potential and other characterization techniques.The re-sults showed that g-C3N4 was evenly distributed on the surface of SiO2 optical fiber.After adsorption of meth-ylene blue molecules,the Zeta potential increased from-45.35 mV to-28.72 mV.The absorption peak at 700 cm-1 in FT-IR spectrum moved to 667 cm-1,and the absorption peak at 600 cm-1 disappeared.The typical emission peak of PL spectroscopy decreased significantly,indicating that g-C3N4 had good adsorption capacity for methylene blue molecules.The surface adsorption of methylene blue on g-C3N4 was studied using red LED as light source and photomultiplier tube as detector by using the characteristics of SiO2 optical fiber and the principle of attenuated total reflection spectroscopy.The experimental results were fitted by Freundlich iso-therm adsorption model and Langmuir isotherm adsorption model.The results showed that the adsorption of methylene blue molecules by g-C3N4 was more in line with the Langmuir isothermal adsorption model,which belonged to single-layer adsorption rather than multi-layer adsorption.
关键词
衰减全反射LED光谱/g-C3N4/SiO2光导纤维/亚甲基蓝/表面吸附Key words
attenuated total reflection LED spectroscopy/g-C3N4/SiO2 optical fiber/methylene blue/surface adsorption引用本文复制引用
基金项目
国家级大学生创新训练项目(202313621002)
沈阳科技学院创新创业孵化扶持项目(2023)()
出版年
2024
国家科技期刊平台
NSTL
万方数据