摻雜氮、硼、氟二氧化鈦配製與光催化研究

Preparation of N, B, F-doped Titanium(IV) Oxide and Study of Photocatalytic Activity

李秉奕(Bing-Yi Lee)

指導教授 ： 許憲呈

長榮大學/健康科學學院/職業安全與衛生學系(所)/碩士(2011年)

https://doi.org/10.6833/CJCU.2011.00161

摘要

本研究主要探討二氧化鈦結構與光催化效率，而一般二氧化鈦降解往往受限在紫外光中，在加上自然中的太陽光紫外光含量不到5%，所以在一些文獻探討中，有提到摻雜物質可改變吸收光波長，故決定將二氧化鈦進行摻雜改質，並運用在可見光條件下。
本實驗是利用溶膠凝膠法(Sol-gel method)製備二氧化鈦粉體，再經由添加氟硼酸銨( NH4BF4 )、氟化銨( NH4F )進行摻雜改質，希望能將氮(N)、氟(F)、硼(B)，摻雜在二氧化鈦晶格中，克服在紫外光中，並有效在可見光進行光催化反應機制，在製造二氧化鈦粉體後，也會在不同溫度下燒結來進行觀察及實驗，同時也會分別摻雜單一與共摻等不同物質做比較。而研究中為了更加了解改質後二氧化鈦，所以利用了紫外光可見光分光譜儀(Ultraviolet-Visible，UV /Vis)，X射線光電子光譜分析( XPS )，X-ray 繞射法(XRD)，拉曼光譜光分析法(Raman spectroscopy， Raman )，掃描式電子顯微鏡 ( scanning electron microscope )，掃描電鏡 ( SEM )等。
結果方面，SEM發現溫度隨溫度燒結越高粒徑越大，孔隙間越小，Raman發現燒結800℃時，有金紅石產生，XRD可在燒結700℃時發現金紅石，在燒結900℃時，銳鈦礦減少，XPS可發現共摻雜氮氟硼摻雜進入晶格中，UV/Vis可發現未燒結到燒結溫度中吸收波長有紅移現象且吸收波長落在可見光。降解方面可見光降解亞甲基藍，已燒結800℃共摻雜氮氟硼效果最佳，降解酚在可見光和UV方面，已摻雜氟硼不加氨水燒結700℃為較佳條件。

關鍵字

氮氟硼共摻雜 ； 二氧化鈦 ； 溶膠凝膠法 ； 光觸媒

並列摘要

The Titanium (IV) oxide (TiO2) is a photocatalyst which usually degrades organic solution at the surrounding of UV light. However, the containment of UV light is only 5% in the atmosphere. In order to utilize visible light effectively, the bandgap of TiO2 is need to be tuned to absorb visible light. Traditionally, the TiO2 doped with impurities can change its bandgap to absorb visible light. In this research, the N, B, F doped-TiO2 samples are adopted under visible light to degrade methylene blue and Phenol.
Firstly, the doped-TiO2 powder is fabricated by Sol-gel method. The NH4BF4 and NH4F are dopants so that N, B, and F could be doped into the TiO2 lattice. The TiO2 power is annealed at different temperatures and then does optics property and crystallography comparisons with each other. In order to obtain more information of doped-TiO2, the Ultraviolet-Visible (UV /Vis), X-ray photoelectron spectroscopy (XPS), X-ray diffraction spectroscopy (XRD), Raman spectroscopy (Raman), and scanning electron microscope (SEM) analyses are adopted.
In the results, it could be found that the gain size is large and interstice between grains is small with the increasing of temperature. At 800oC, the anatas phase transforms into the Rutile phase shown in the Raman spectra. Increasing the temperature to 900oC, the N, F, and B are doped into the TiO2 which are indicated in the XPS spectra. In the UV/Vis spectra, there is red-shift absorption phenomenon for as-grown samples compared with other annealing samples which makes the wavelength absorption locates in visible light range. In the degradation of methylene blue and Phenol, the best conditions are N, F and B co-doped TiO2 annealed at 800oC and F and B co-doped TiO2 annealed at 700oC, respectively.

並列關鍵字

N,F,B-codoped ； Titanium (IV) oxide ； sol-gel method ； photocatalyst

參考文獻

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