分子印迹TiO2的制备及其对抗生素磺胺甲氧嘧啶的光催化降解

摘要采用分子印迹聚合物对 TiO2 进行改性，以磺胺甲氧嘧啶（SMD）为模板分子、甲基丙烯酸为功能单体，采用表面分子印迹技术在纳米二氧化钛表面合成 SMD-分子印迹 TiO2，得到分子印迹 TiO2 以提高 TiO2 的光催化性能和选择性。优化了模板分子、功能单体、交联剂和 TiO2 的比例。采用傅里叶红外光谱（FT-IR）、扫描电镜(SEM)、X-射线衍射（XRD）对分子印迹 TiO2 进行表征, 并探讨了它对磺胺甲氧嘧啶的光催化性能。结果显示，最佳制备条件为：模板分子：功能单体：交联剂为 1:4:8、TiO2 的用量为 0。05g。红外光谱显示分子印迹 TiO2 合成成功，从扫描电镜图可以看出分子印迹 TiO2 颗粒表面变得光滑，粒径变大，证明分子印迹分子确实成功包覆在 TiO2 表面，X-射线衍射表明，MIP-TiO2 仍保持了和 TiO2 一样的锐钛矿型结构。83158

MIP-TiO2 对 SMD 表现出良好的光催化效果，对 SMD 的降解速率是 TiO2 对 SMD 光催化降解速率的 1。4 倍。MIP-TiO2 光催化降解 SMD 的最适 pH 为 5、光降解时间为 100min，在催化剂用量为 0。4g/L 的条件下，对浓度 5mg/L 的 SMD 的光催化降解效率可达 100%。MIP-TiO2 对 SMD 具有较好的选择性光催化能力，与 SMD 的结构类似物磺胺甲恶唑和磺胺噻唑相比，SMD 的光催化选择系数分别为 1。54 和 1。35。

毕业论文关键词：分子印迹；磺胺甲氧嘧啶；光催化降解；光催化剂；TiO2

Abstract In this paper，using molecularly imprinted polymers（MIPs） to modify titanium dioxide，using sulfamethoxydiazine（SMD）as template，choosing proper functional monomers，using molecularly imprinting technology to synthesize SMD-MIPs on the

surface of nano titanium dioxide, to improve the Photocatalytic Properties of nano titanium dioxide。the influence of technological conditions on the photocatalytic properties of nano titanium dioxide ， such as ratio of reactant,reacting

temperature,reacting time,has been investigated, the optimal preparation condition has been determined。 Using Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), X-ray diffraction (XRD) to characterize MIPs, and its photocatalytic properties has been researched。 The results is that the best preparation condition is :the mole ratio of template, monomer and crosslinking agent is 1:4:8,the dose of titanium dioxide is 0。05g。 Infrared spectroscopy shows that MIPs was synthesized successfully, SEM analysis shows that the surface of MIPs was smooth and the particle size was bigger, proves that the molecularly imprinted polymer was successfully grafted onto the surface of TiO2。X-ray diffraction results showed that MIP-TiO2 exited in the identical anatase phase as TiO2 。

The MIP-TiO2 exhibited excellent photocatalytic selectivity for SMD。 The degradation rate of MIP-TiO2 for SMD is 1。4 times that of TiO2。 The optimal Ph condition of photocatalytic degration on SMD was 5 and photocatalytic degration time was 100 min。 The degradation rate of SMD with initial concentration of 5mg/L could reach 100% under the condition of pH 5 and MIP-TiO2 concentration of 0。4g/L。

The MIP-TiO2 exhibited excellent photocatalytic selectivity for SMD。 The photocatalytic selectivity coefficient of SMD respect to SMO and ST were 1。54 and 1。35, respectively。

Key words : molecularly imprinted polymers; sulfamethoxydiazine; photocatalyst; titanium dioxide;

第一章绪论 1

1。1 抗生素对环境的污染现状 1

1。2 抗生素污染治理方法的研究现状 1

1。2。1 物理法分子印迹TiO2的制备及其对抗生素磺胺甲氧嘧啶的光催化降解:http://www.youerw.com/huaxue/lunwen_97865.html