第五章 結論與建議
5.2 建議
1. 研究後續若要深入探討,建議可再增加鍛燒步驟,更強化TiO2與 銀之結合,且一般奈米粉體經過鍛燒更容易產生團聚現象,與經 過鍛燒但分散良好之TiO2/Ag再進行比較,可更明顯辨別分散之優 劣程度。
2. 當在可測得或得知物體表面電性下,便可利用控制表面電性差異 特性,將TiO2均勻披覆於其它擔體,如金屬網或可測得表面電性 之物種上,使其有良好分散性,拓展其應用範圍。
3. 未來可推廣應用於全時效性醫療抗菌,銀本身抗菌效果極佳,利 用高效能之高分散TiO2/Ag複合物不但可殺除細菌,當TiO2照光時 還能將其分解,但相關之滅菌測試需再進一步研究。
4. 奈米光觸媒在反應完成後,普遍存在回收困難,或使水體濁度提 高,而造成二次污染的問題,可針對此問題,研究利用電性相異 特性,回收懸浮TiO2之溶液。
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附錄 ㄧ
XRD-JCPDS 標準圖譜
附錄 二
XPS 標準圖譜
附錄 三
銅、銀之物化特性
圖:銀之Pourbaix 熱力學平衡氧化物種圖(Pourbaix,1974)
圖:銅之 Pourbaix 熱力學平衡氧化物種圖(Pourbaix,1974)
表:Ag 與 Cu 之物化特性
項目/metal Ag Cu
特性 吸附氧氣,釋出銀離子,殺菌 空軌域,捕捉電子,殺菌 應用 殺菌,有機物分解 可見光,殺菌,有機物分解
屬性 貴重金屬 過渡金屬
可填充最低軌域 5s4d5p 4s3d4p
氧化態 +1,+2 +1,+2
導電度 6.3 ×107 S/m 5.8 ×107 S/m 電阻率(20 ℃) 1.59×10-6 歐‧米 1.7241×10-6 歐‧米
標準還原電位 0.76mV 0.337mV
熱導度 418 W/m‧s(100℃)
熔點( ℃) 909 900
表面能(mJ/m2) 1140 1750
藥品級成本 120NT/g 12.8NT/g