| 研究生: |
吳宇婷 Wu, Yu-Ting |
|---|---|
| 論文名稱: |
以金屬氫氧化物模板法製備metal-silicate孔洞性複合材料之合成與應用 Synthesis and Application of Mesostructural Metal-Silicate Materials by Using Metal Hydroxide-Templating Method |
| 指導教授: |
林弘萍
Lin, Hong-Ping |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2014 |
| 畢業學年度: | 102 |
| 語文別: | 中文 |
| 論文頁數: | 112 |
| 中文關鍵詞: | 金屬氫氧化物模板法 、metal-silicate 、中孔洞複合材料 |
| 外文關鍵詞: | copper silicate, zinc silicate, iron silicate, metal hydroxide-templating |
| 相關次數: | 點閱:63 下載:5 |
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本論文主旨在於,利用簡便的金屬氫氧化物模板法得到具有高表面積、高金屬氧化物分散性之metal-silicate中孔洞複合材料,並利用製備而得的材料探討其相關應用性。以往製備孔洞材料的研究中,常利用有機模板,藉由模板和生成物間的作用力,生成與模板具有相似結構之構型的材料,但必須利用酸洗或是高溫煅燒的方式來移除模板,實驗過程較為繁複且成本較高。本研究則先製備出金屬氫氧化物作為模板,再加入矽酸鈉或中孔洞氧化矽後使材料在鹼性環境下進行水熱反應,使矽酸鹽對金屬氫氧化物進行剝蝕之後再與其結合,且由於金屬氫氧化物和silicate兩者的晶格大小不同,重組後結構具有捲曲力,可形成具有特殊介尺度構型的metal-silicate。
在實驗參數的調控方面,藉由改變水熱反應pH值、金屬氫氧化物模板熟化時間、水熱反應時間、金屬/氧化矽比例、反應濃度等實驗參數,控制實驗路徑及最佳合成條件,並發現此合成方式具有很好的再現性,在研究中,利用此金屬氫氧化物模板法可製得管狀之Cu-silicate、捲曲片狀之Zn-silicate材料及Fe-silicate複合材料。
(1) Cu-silicate複合材料
利用金屬氫氧化物模板法在pH ≈ 11.0的條件下,在100℃水熱一天後,矽酸鹽對層狀氫氧化銅模板進行剝蝕,可得具有特殊管狀結構的copper-silicate中孔洞複合材料,表面積約在400 m2/g。之後進一步利用共沉澱法將合成步驟簡化,並且引入銅離子廢液為前驅物,此實驗合成方式具有改善工業廢棄物汙染的潛力。因為手法簡易的優勢下,利於放大製程的操作,此類型之複合材料對於催化觸媒、工業上之有毒氣體(PH3或SiH4)吸附方面有顯著的效果,根據測試結果得知,在測試條件為通入流速0.22 m/min、濃度為694 ppm的SiH4時,材料的吸附效率為99.2%,且有效吸附量為 80 mg/g,可知有良好的吸附效果。接著利用簡易迴流的方式,以copper-silicate作為前驅物,加入有機分子BTC,合成出具有MOFs結構的Cu3(BTC)2- silicate複合材料,此材料對於溫室氣體SF6的吸附具有很好的攔截效果。
(2) Zn-silicate複合材料
利用金屬氫氧化物模板法在pH ≈ 8.0的條件下,100℃水熱一天後,可得具有片狀捲曲結構的Zn-silicate中孔洞複合材料,表面積約在230 m2/g。在應用上,將合成出的Zn-silicate複合材料吸附適當濃度的Mn2+後在900℃下煅燒,使其轉相為Zn2SiO4:Mn2+,具有放出綠色螢光的特性,在做為綠色螢光粉上有應用潛力。
(3) Fe-silicate複合材料
本實驗利用中孔洞氧化矽為氧化矽源,在水熱過程中氧化矽會溶出矽酸鹽,並且與氧化鐵進行重組,可得高氧化鐵含量(Fe/SiO2=1.6)、高表面積(約400 m2/g)且具有顆粒狀結構之Fe-silicate複合材料。另外為了拓展材料的應用性,引入亞鐵離子為前驅物,合成出具有磁性之Fe(Ⅱ)/(Ⅲ)-silicate。經過測試,此類材料對水中磷酸鹽有吸附效果。
In this thesis, we provided a facile metal hydroxide-templating method to prepare mesostructural metal-silicate materials by hydrothermal treatment without any surfactants. To mimic the formation of the clay minerals in Nature, we prepared the metal hydroxide precipitation by adding appropriate amount of NaOH (aq) into metal salt aqueous solution, and then mixing the gel solution with sodium silicate aqueous solution. After hydrothermal treatment for an appropriate time, the mesoporous metal silicate was formed.The effect of pH, hydrothermal time, aging time and other experimental parameters were also discussed in this study. The resulted metal-silicate materials, including tubular copper silicate, sheet-like zinc silicate and granulated iron silicate have large surface areas and well dispersed metal oxide active sites. In practice, these metal silicate materials demonstrate high performances to be used as adsorbents of toxic gases, catalysts and phosphors.
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