合成二氧化鈦奈米粒子及其應用於生質廢水脫色處理與光電化學水解製氫

Preparation of TiO2 Nanoparticles and Its Applications in Decolorization and Photoelectrochemical Hydrogen Evolution Using Biomass Wastewater

張偉玲(Chang, Weiling)

指導教授 ： 李元堯

國立中正大學/工學院/化學工程學系/碩士(2012年)

摘要

本研究主要目的為生質廢水的脫色處理，另外於生質溶液中結合光電化學法製氫與脫色之處理，以達到廢水處理與產氫的雙重功能。脫色處理以UV/TiO2及UV/H2O2兩種程序在光照下進行反應，利用UV-vis檢測生質廢液吸收光譜，並配合生質廢液成分分析，其結果顯示UV/TiO2程序主要處理生質廢水中的小分子有機物；而UV/H2O2程序主要則是處理廢水中的蛋白質及氨基酸部份，且在反應7天後，廢水之真色色度已達可排放之標準。
以溶膠-凝膠法所合成之二氧化鈦奈米粒子經由SEM、XRD、TGA及UV-vis的分析可知，在350℃-550℃鍛燒過後為具有結晶性之混合晶相二氧化鈦，其能隙值約為3.0 eV，且隨著鍛燒溫度不同，所含Rutile與Anatase比例亦跟著變化；若將各溫度下所合成之二氧化鈦製備成電極，以檢測其光電化學法水解製氫之效能，則以在500℃下鍛燒，含有27%Rutile之二氧化鈦，展現出最佳效能。
在生質溶液中的水解製氫實驗，則是結合產氫實驗與脫色處理程序，以500℃鍛燒下之二氧化鈦為工作電極，於生質溶液中進行水解製氫反應，並另外加入H2O2以配合脫色之程序，實驗結果發現加入不僅可大量提升氫氣產量，亦可同時進行脫色處理。

關鍵字

二氧化鈦 ； 生質廢水 ； 光催化水解製氫

並列摘要

This study is to investigate the decolorization of biomass wastewater using a variety of processes, TiO2 nanoparticles was employed to act as a role of decolorization and photoelectrochemical hydrogen evolution using biomass wastewater. The decolorization of biomass wastewater was investigated under Xenon light irradiation in the presence of TiO2 and H2O2 under different conditions. The result of UV-vis spectrum and the component analysis of biomass wastewater showed that, in UV/TiO2 process, TiO2 primarily reacted with organic compounds with low molecular weight in wastewater; while H2O2 mainly reacted with proteins and amino acids, which are the main components of the wastewater. The true color of biomass wastewater met the effluent standards after reaction for 7 days.
With SEM, XRD, TGA and UV-vis analysis, TiO2 nanoparticles were confirmed as a mixture phases of anatase and rutile after calcination at 350℃-550℃. The band gap of TiO2 nanoparticles was about 3.0 eV. The synthesized TiO2 nanoparticles were then prepared as a work electrode to evaluate the efficiency of hydrogen evolution in methanol solution. It was found that the as prepared TiO2 containing 27% rutile exhibited the highest efficiency.
Hydrogen evolution and decolorization were combined using photoelectrochemical process with biomass wastewater. The TiO2 nanoparticles calcinated at 500℃ were used as the working electrode and H2O2 were employed in to the solution. The result indicated that, with the presence of H2O2, the amount of hydrogen evolution was increased, and the biomass wastewater was decolorized.

並列關鍵字

Titanium dioxide ； Biomass wastewater ； water splitting

參考文獻

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