基于衰减全反射LED光谱的g-C_(3)N_(4)对亚甲基蓝表面的吸附  

Adsorption of methylene blue surface by g-C_(3)N_(4) based on attenuated total reflection LED spectroscopy

作　　者：王思祺 洪雯雯 卜义夫 邵梦莎 李静怡 刘思乐 WANG Siqi;HONG Wenwen;BU Yifu;SHAO Mengsha;LI Jingyi;LIU Sile(Shenyang Institute of Science and Technology,Shenyang 110167,China;Zhejiang Qinyan Technology Co.Ltd.,Shaoxing 312000,China)

机构地区：[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

出　　处：《印染助剂》2024年第3期32-37,共6页Textile Auxiliaries

基　　金：国家级大学生创新训练项目(202313621002);2023年沈阳科技学院创新创业孵化扶持项目。

摘　　要：以SiO_(2)光导纤维为载体,通过溶胶-凝胶法将g-C_(3)N_(4)负载在SiO_(2)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-C_(3)N_(4)均匀分布在SiO_(2)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-C_(3)N_(4)对亚甲基蓝分子有较好的吸附能力。利用SiO_(2)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-C_(3)N_(4)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-C_(3)N_(4)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。With SiO_(2) photoconductive fiber as the carrier,g-C_(3)N_(4) was loaded on the surface of SiO_(2) optical 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 spectroscopy(PL),fluorescence electron microscopy(LSCM),Zeta potential and other characterization techniques.The results showed that g-C_(3)N_(4) was evenly distributed on the surface of SiO_(2) optical fiber.After adsorption of methylene blue molecules,the Zeta potential increased from-45.35 mV to-28.72 mV.The absorption peak at 700cm^(-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-C_(3)N_(4) had good adsorption capacity for methylene blue molecules.The surface adsorption of methylene blue on g-C_(3)N_(4) was studied using red LED as light source and photomultiplier tube as detector by using the characteristics of SiO_(2) optical fiber and the principle of attenuated total reflection spectroscopy.The experimental results were fitted by Freundlich isotherm adsorption model and Langmuir isotherm adsorption model.The results showed that the adsorption of methylene blue molecules by g-C_(3)N_(4) 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-C_(3)N_(4) SiO_(2)光导纤维 亚甲基蓝 表面吸附 

分 类 号：O643[理学—物理化学]