含鉭焦綠石奈米顆粒的成分調控與其於光催化水分解之研究

Tantalum-based Pyrochlore Nanoparticles with Components Controlling for Photocatalytic Water Splitting

蔡億泰(I-Tai Tsai)

指導教授 ： 楊家銘

國立清華大學/理學院/化學系所/碩士(2019年)

摘要

本研究針對先前實驗室開發之高結晶性單相含鉭焦綠石奈米顆粒進
行成分上的調控。在合成過程中透過調整含鈮前驅物與含鉭前驅物
之間的比例，可合成出不同比例的鈮鉭混和焦綠石，並且在UV-Vis
吸收光譜可以看到隨鈮含量的增加，吸收波段有紅位移的現象，其
中合成液鈮鉭前驅物莫耳比為1:1 的樣品負載銀之後能夠在300 奈
米波長以上的光照下，有純水分解產氫及過氧化氫的能力，並且在
全光照射下能維持與純鉭焦綠石相似的活性。此外，利用氨氣環境
下熱處理的方法，在不同溫度下得到具有氧空缺及結構缺陷的含鉭
焦綠石，並且300 oC 熱處理下的樣品，在300 奈米以上波長光源照
射下同樣有純水分解產氫及過氧化氫之能力。

關鍵字

焦綠石 ； 鉭酸鹽 ； 過氧化氫 ； 光觸媒 ； 光催化水分解

並列摘要

In this thesis, highly crystalline tantalum-based pyrochlore nanoparticles were synthesized by microwave assisted hydrothermal
process. We tried to control the component of tantalum-based pyrochlore by two ways. First, niobium-based precursor was added in synthesis solution of tantalum-based pyrochlore system in microwave process. Among different amounts of niobium-based precursor adding, we found that the sample with molar ratio 1:1 of niobium and tantalum showed the best activity of H2 evolution in pure water than the samples with the other ratio under over 300 nm light irradiation. In addition, hydrogen peroxide was also detected in solution like tantalum-based pyrochlore. Second, we did the thermal treatment for tantalum-based pyrochlore under NH3 gas flow. We found that the sample which was treated under 300 oC kept the activity like the sample without thermal treatment, and showed the activity
of H2 evolution and hydrogen peroxide production in pure water under over 300 nm light irradiation.

並列關鍵字

Pyrochlore ； Tantalate ； Hydrogen percxide ； Photocatalyst ； Photocatalytic water splitting

參考文獻

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