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標題: | 利用 (001) 晶面銳鈦礦二氧化鈦移除水中氨及硝酸根離子 Removal of ammonia/ammonium and nitrate from water using anatase TiO2 with exposed (001) facet |
作者: | "Huynh, Chi-Phu" 黃志富 |
指導教授: | 吳紀聖(Jeffrey Chi-Sheng Wu) |
關鍵字: | (0 0 1)晶面二氧化鈦,光觸媒,雙金屬負載, (001) facet TiO2,photocatalyst,bimetal loading, |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 過去數十年間,為了因應迅速成長的人口而進行的大量的農業活動造成了許多問題,例如硝酸鹽及氨所致的水汙染。光觸媒可被用來進行先進的氧化及還原反應以有效解決此問題。最常用的光觸媒二氧化鈦因穩定度及蘊藏量皆高,是個適合的選擇,尤其是對於以農業為經濟生產主體的開發中國家。過去的許多研究著手於解決二氧化鈦的已知缺點,像是電子電洞的高結合速率。擁有高比例裸露(001)晶面的二氧化鈦被視為是很有潛力的解方。這個研究旨在於應用二氧化鈦(001)來氧化氨及還原硝酸鹽以達成高移除率及高氮氣產物選擇率的目標。實驗結果顯示FTO1:1可在預設條件及5小時的光照下移除大約60%的氨(初濃度5ppm),且產物具有接近100%的硝酸根選擇率。1Pd-1Cu/FTO1:1在甲酸(0.04M)存在下可在1小時的紫外光照射後完全移除300ppm的硝酸根,產物的氮氣選擇率達89.2%。另外,其他變因如酸鹼值、雙金屬負載及負載方法亦在實驗中探討。 During the past few decades, in order to provide for the increasing number of the population, extensive agricultural activities have been carried out leading to the raise of many issues, specially, the pollution of water due to nitrate and ammonia. In order to effectively resolve these issues, advanced oxidation process and advanced reduction process can be employed through the usage of photocatalyst. TiO2 with large percentage of (001) facet has been extensively studied since being introduced in 2009. This type of photocatalyst can significantly tackle the known disadvantages of TiO2 such as the high recombination rate which makes TiO2 a very promising photocatalyst for resolving the pollution of nitrate and ammonia due to being cheap, stable and highly active. The research has synthesized TiO2 (001) using simply hydrothermal treatment. On the one hand, due to the inherently low reaction rate between ammonia and hydroxyl radicals, the removal of ammonia using FTO1:1 was not remarkable (60% of 5 ppm initial ammonia concentration after 5 hours). However, for the removal of nitrate, results showed that by incorporating Pd and Cu with the TiO2 (001), in the presence of formic acid (0.04 M), complete removal of 300 ppm initial NO3- concentration with 89.2% selectivity toward N2 with in 1 hour was possible. This result is much higher compared to using P25. Moreover, the condition used in this research was much simpler and yet still able to obtain higher results compared to several previous researches in terms of reaction duration, concentration of nitrate and selectivity toward N2 making this photocatalyst highly suitable to be employed to practical system to removal nitrate-polluted agricultural water in developing country thanks to the low investment cost. Furthermore, firstly, the research also contributed in clarifying the controversial reason underlying the low removal of ammonia using photocatalyst (the low reaction rate between hydroxyl radical and ammonia, the adsorption behavior of ammonia onto the surface of the photocatalyst). Secondly, the research thoroughly explained the contradicting results between previous researches with regard to the bimetallic composition. Lastly, the interactive effects between several important reacting factor such as pH, bimetallic composition, concentration of hole scavenger, the loading method were made clear within the research offering the useful explanation and reference for future researches. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/66460 |
DOI: | 10.6342/NTU202000026 |
全文授權: | 有償授權 |
顯示於系所單位: | 化學工程學系 |
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