製備含有銀粒子的中空二氧化鈦球及應用

Preparation and application Ag/TiO2 hollow spheres

李仁傑(Ren-Jie Li)

指導教授 ： 許克瀛

中原大學/工學院/化學工程研究所/碩士(2012年)

https://doi.org/10.6840/cycu201200593

摘要

利用無乳化劑乳化聚合法製備出單一散度的聚苯乙烯顆粒(Polystyrene , PS)，再以靜電自組裝及水解縮合法將二氧化鈦包覆在聚苯乙烯上，最後使用還原劑NaBH4將銀粒子還原在二氧化鈦顆粒表面。添加非離子型分散劑聚乙烯基吡咯烷酮(Polyvinylpyrrolidone, PVP)將聚苯乙烯顆粒均勻地分散，可降低二氧化鈦因水解縮合而造成自行團聚的現象。添加十六烷基三甲基溴化铵(Hexadecyl trimethyl ammonium bromide, CTAB)處理聚苯乙烯表面使帶有正電性，而二氧化鈦前驅物帶負電才能順利包覆聚苯乙烯顆粒。將硝酸銀溶液(Silver nitrate, AgNO3)加入TiO2/PS複合顆粒的溶液中，利用還原劑製備出Ag/TiO2/PS複合顆粒，藉由高溫鍛燒移除聚苯乙烯和改變二氧化鈦的晶相。將二氧化鈦複合顆粒加入亞甲基藍溶液中，並使用紫外線燈箱照射，進行光催化反應。
使用的儀器包括SEM、DLS、TGA、UV/vis等儀器，SEM，可觀察到複合顆粒的表面型態，以DLS來分析聚苯乙烯顆粒的大小，藉由TGA可分析，不同溫度下樣品的熱重損失，最後以UV/vis圖譜分析複合顆粒因降解亞甲基藍溶液而產生吸收度的變化。

關鍵字

二氧化鈦 ； 光催化反應 ； 二氧化鈦複合顆粒

並列摘要

The mono-disperse Polystyrene particle were prepared by Free-emulsion polymerization, and coating with titanium on the polystyrene particles vis self-assembly technology, final, the silver particle will reduced on the TiO2 particle surface by reducing agnet. The added nonionic surfactant polyvinylpyrrolidone can dispersed polystyrene particle and to avoid aggregate phenomenon of titanium dioxide due to the hydrolysis-condensation process. In addition, by adding CTAB solution to polystyrene particle solution, because the polystyrene particle have positively charged on particle surface, therefore, the precursor of titanium dioxide can be coated on polystyrene surface. The silver nitrate solution was added to the solution of the TiO2/PS, and Ag/TiO2/PS composite particles were prepared by reducing agnet. In order to remove PS particle and improve TiO2 crystalline, high temperature to calcine core-shell particles was used. The composite particle were added to methylene blue solution, it’s carried out photocatalytic reaction and UV lamp was used.

There are many instruments of analysis to be used, including DLS, SEM, UV/vis and TGA. From the DLS results, the particle size distribution of PS particle was analyzed. From the SEM results, the core-shell materials and its structure were observed. From the TGA results, the thermal weight loss of PS particles was obtained. And from the UV/vis results, the absorbance change of methylene blue solution was analyzed.

並列關鍵字

composite materials of TiO2 ； TiO2 ； Photocatalytic reaction

參考文獻

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