聚吡咯纳米复合材料的制备与光电、吸附性能研究

发布时间：2018-04-27 08:05

  本文选题：聚吡咯 + 硫化镉　； 参考：《苏州科技学院》2015年硕士论文

【摘要】：作为典型的本征型导电聚合物,聚毗咯(PPy)具有合成简单、导电性能好、不易被氧化、热稳定性能高等特点,备受研究人员关注。PPy已被广泛应用在二次电池、生物感应器、非线性光学装置、电致变色显示器、功能分子膜等领域。聚吡咯／纳米半导体复合物兼具PPy和纳米粒子的性能,有待深入研究与应用。本文合成了PPy/CdS复合材料,着重研究其光电和吸附性能。(1)通过界面聚合-原位法制备了PPy/CdS复合薄膜材料,用红外光谱(FTIR)、扫描电镜(SEM-EDAX)、X射线衍射(XRD)、热重分析(TGA)、紫外吸收(UV-vis)等方法对产物进行了表征。制备的PPy/CdS薄膜结构平整,投料比对CdS纳米棒尺度有明显影响。Z-扫描技术(Z-scan)研究结果表明,PPy/CdS的三阶非线性光学(NLO)性质表现为饱和吸收和非线性负折射。PPy/CdS (10:1)薄膜的非线性折射率是PPy薄膜的2.4倍,三阶非线性极化率是PPy的2.1倍。该复合材料在光限幅等光电领域具有潜在的应用价值。(2)研究了PPy/CdS复合物光催化降解亚甲基蓝的特性。与CdS相比,PPy/CdS复合物具有较高的光催化效率,亚甲基蓝的初始浓度、反应时间、催化剂用量、pH值、反应温度等因素影响光催化降解效率。当亚甲基蓝的浓度为5mg/L,PPy/CdS复合物的用量为15g/L,溶液的pH值为7左右,反应时间为15min,光强度为200W时,PPy/CdS对亚甲基蓝的光催化降解率可达到97.51%。(3)用PPy及其复合材料去除水中的Cr(Ⅵ)。探讨了pH值、温度、吸附时间、Cr(Ⅵ)浓度、PPy用量对Cr(Ⅵ)去除效率的影响。PPy／玻璃纤维膜器件对Cr(Ⅵ)具有更好的去除效果,当Cr(Ⅵ)的初始浓度为50mg/L,pH值为3,PPy的用量为6 g/L,反应时间为15min时,Cr(Ⅵ)的去除率为82.5%。
[Abstract]:As a typical intrinsic conductive polymer, Polymeric pyrrolidone (PPy) has been widely used in secondary batteries and biosensors for its advantages of simple synthesis, good conductivity, low oxidation resistance and high thermal stability. Nonlinear optical device, electrochromic display, functional molecular film and other fields. The polypyrrole / nanometer semiconductor composite has the properties of both PPy and nanoparticles, so it needs further research and application. In this paper, PPy/CdS composite materials were synthesized, and the optoelectronic and adsorption properties of PPy/CdS composite films were studied. (1) PPy/CdS composite films were prepared by interfacial polymerization-in-situ method. The products were characterized by FTIR, SEM, SEM, TGA, UV-vis). The products were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and UV-vis-vis (UV-vis). The structure of the prepared PPy/CdS thin films is flat, The results show that the third-order nonlinear optical properties of CdS / CdS are saturated absorption and nonlinear negative refraction. The nonlinear refractive index of PPy thin films is 2.4 times that of PPy thin films. The third order nonlinear polarizability is 2.1 times higher than that of PPy. The composite has potential application value in optoelectronic fields such as optical limiting, etc.) the photocatalytic degradation of methylene blue by PPy/CdS complex has been studied. Compared with CdS, the Py / CDs complex has higher photocatalytic efficiency. The initial concentration of methylene blue, reaction time, the amount of catalyst and pH value, the reaction temperature and other factors affect the photocatalytic degradation efficiency. When the concentration of methylene blue was 5 mg 路L ~ (-1) / L ~ (-1), the dosage of PPy-CdS complex was 15 g / L, the pH value of solution was about 7, the reaction time was 15 min and the light intensity was 200 W, the photocatalytic degradation rate of methylene blue could reach 97.51% with PPy and its composite material. The effects of pH value, temperature, adsorption time and concentration of PPy on the removal efficiency of Cr (鈪，

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