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標題: 具磁性TiO2和polyoxometalates對Cr(VI)之光還原研究
Photoreduction of Cr(VI) on magnetized TiO2 and polyoxometalates
作者: 何雅婷
He, Ya-Ting
關鍵字: Cr(VI) TiO2 polyoxometalates(POMs);六價鉻 二氧化鈦 聚合氧化金屬鹽類
出版社: 土壤環境科學系所
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Environments, including atmosphere, lithosphere, hydrosphere and biosphere, influenced by toxic Cr(VI) have been widely studied. To decrease the toxicity and mobility of Cr(VI), the transformations of Cr(VI) to Cr(III) using reducing agents or catalysts are the most favorable processes due to their less impacts to the ecosystem. During the past decades, degradation of organic contaminants or transformation of inorganic contaminant to its solidic or less toxic forms induced by light energy through photosensitive materials, such as semiconductors, had received much scientific attentions. However, the photosensitive materials are either too small or dissoluble, which leads to the difficulty in recycling and reuse of the materials. Therefore, this study is aim to magnetize the photosensitive materials for enhancement of their applications in treating environmental pollutant, i.e., Cr(VI).
TiO2 and polyoxometalates (POMs) are both photocatalysts, which are magnetized and employed in the study. Briefly, magnetite was first synthesized as a core material followed by precipitating TiO2 and POM on it. To avoid the possible photodissolution of the core material due to electron-transfer from photocatalysts during the photo-reactions, a silica layer was sit between the magnetite and photocatalysts. The magnetized TiO2 and POM were denoted as MSTi and MSPOM, respectively, and reduction of 0.0385 mM Cr(VI) on these two photocatalysts was conducted at acidic solutions. The optimal reaction parameters were investigated, and the used MSTi and MSPOM were separated from solutions by a magnet for further use. The results indicated that 1 g L-1 MSTi could remove 0.0292 mmol g-1 Cr(VI) after 6 h reaction at pH 3 under UV illumination. The removal involves adsorption and reduction of Cr(VI) on MSTi. On the other hand, added Cr(VI) (i.e., 0.0385 mM) disappeared completely within 6 h when 1g L-1 MSPOM was added into a solution exposed to UV light at pH 1. The disappearance was attributed to Cr(VI) reduction on MSPOM. Because MSPOM exhibited a low adsorption ability of Cr(III), the Cr(III) predominate in solution once it was produced. It was found that Cr(VI) removal on MSTi would decrease slightly with increasing the times of use. This may be due to the limited adsorption sites on MSTi. However, MSPOM reduced Cr(VI) efficiently, and it would not adsorption the reductive products (i.e., Cr(III)). Therefore, its ability for Cr(VI) removal would not decrease with increasing the times of use.
Accordingly, it was found that MSTi and MSPOM can be readily recycled and reused without eliminating their efficiency for Cr(VI) removal. These two magnetized photocatalysts may be cost-effective and potential materials for treatment of Cr(VI) or other contaminants in wastewaters.

TiO2和polyoxometalates(POMs)為具有半導體性質之光催化物質,將這兩種光敏感物質分別包覆於磁鐵礦外圍,藉由磁鐵礦之磁性增加材料回收的便利性,為避免外圍之TiO2和POMs對核心磁鐵礦造成光溶解反應,於兩者間插入一矽酸層,能有效隔絕電子的傳遞,因此本實驗為利用所合成之MSTiH和MSPOM對0.0385 mM Cr(VI)進行光還原反應,評估兩種材料的最佳反應條件並利用磁性回收材料,且於最適條件下測試材料的再利用效果。研究結果顯示,MSTiH在UV光照下以固液比1 g L-1 pH 3 背景液為0.01 M KCl環境中,反應6小時後可有效移除0.0292 mmol g-1的Cr(VI),移除方式為吸附和還原反應,MSPOM於UV光照下以固液比1 g L-1 pH 1背景液為 0.01 M KCl環境中,反應6小時後可完全移除懸浮液中的Cr(VI),主要以還原方式將Cr(VI)還原成Cr(III),且MSPOM僅具少量吸附量,因此還原後的Cr(III)主要存在於水體中。由反應過後之MSTiH和MSPOM的再利用評估結果可知,MSTiH的Cr(VI)移除量會隨使用次數的增加而減少,但還原量無顯著差異,造成移除量降低的原因主要為材料表面吸附位置隨使用次數增加而減少所致,MSPOM部分,對Cr(VI)移除量隨使用次數增加並無明顯差異,MSPOM主要是以還原方式移除Cr(VI),因此在重覆使用過程中,材料不會因吸附位置的減少而減少其對Cr(VI)的移除量。
其他識別: U0005-2208200818302400
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