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標題: 二氧化鈦光催化降解雌二醇(E2)之研究
Study on the degradation of 17β-estradiol(E2) by TiO2 photocatalysts
作者: 陳瀅屯
Chen, Ring-Tun
關鍵字: 二氧化鈦;TiO2;雌二醇;光催化;17β-estradiol;Photocatalytic
出版社: 環境工程學系所
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許多國家於污水處理廠排水處及地表水發現內分泌干擾物質(Endocrine Disrupting Chemicals, EDCs)的存在,其中天然雌性激素雌二醇(17β-estradiol, E2)被確認為最具內分泌干擾活性之物質,E2曝露於環境中的濃度約為ng/L,但卻足以影響生態環境與人類健康,造成性別比例失衡、雌性化及生殖異常等問題,傳統污水處理技術無法有效將E2完全降解,必須以更完善處理技術提高E2之去除。近年來高級氧化處理技術備受矚目,因其能有效的去除有機污染物,其中以二氧化鈦光催化處理具有操作簡單、反應時間短及成本低之優勢。
本研究利用二氧化鈦光催化提升E2去除率,並進行部分水質參數影響之研究。研究將分別藉由FE-SEM、HRXRD、ESCA及UV/VIS進行光觸媒表面特性分析,以了解光觸媒型態與晶相組成等,本實驗分為兩部分,首先針對不同TiO2添加量(0.1、0.5、1、2 g/L)、pH值(5、7、9)及雌二醇初始濃度(1、5、10 μM)進行光催化處理,以尋求較佳的處理條件,再針對NO3-(0、1、10、20 mg/L)、 溶氧(1、9 mg/L)及Fe3+(0、0.5、1、2 mg/L)之參數條件進行參數影響的探討。
經由表面特性分析結果可知,製備之光觸媒以球形顆粒存在,其粒徑大小為30 nm,晶型為銳鈦礦與金紅石之複合晶型,起始吸收波長為424 nm,推論能隙為2.92 eV。研究結果顯示E2的降解率隨TiO2添加量增加而上升,但於1 g/L下有較佳的礦化效果,因此以1 g/L 為最佳的TiO2添加量,pH值的提高有助於E2的降解,但酸性條件下有較好的礦化情形,為求雌二醇的礦化效率,以pH 5為最佳的反應溶液pH值,E2的降解速率雖隨E2初始濃度的上升而降低,但高濃度下每單位時間E2處理量較多。參數影響方面,NO3-、 溶氧及Fe3+的濃度增加均能提高E2的光催化與礦化效果,表示水中此類參數有助於E2之去除。

17β-estradiol (E2) is one of the Endocrine Disrupting Chemicals (EDCs) and affect ecological environment and human health, including imbalance of sex ratios, feminization and reproductive abnormalities in trace concentration. Many countries found that both sewage treatment plant and surface water had EDCs. The conventional sewage treatment technology can not remove E2 completely. To improve the treatment program for the E2 removal is necessary. In recent years, TiO2 photocatalysis was more popular. It has advantages including simple operation, short reaction time and low cost.
In this study, the TiO2 photocatalysis was conducted to increase E2 removal rate, and the effect of water parameters were investigated. The TiO2 photocatalytic pattern and crystal phase composition were analyzed by FE-SEM、HRXRD、ESCA and UV/VIS. The experiments include two parts. In the first part, different dose of TiO2 (0.1, 0.5, 1, 2 g/L), pH (5, 7, 9) and adjusted initial concentration of E2 (1, 5, 10 μM) were studied to find better condition for TiO2 photocatalysis.In the second part, different concentration of water quality parameters involving NO3- (0, 1, 10, 20 mg/L), dissolved oxygen (1, 9 mg/L) and Fe3+ (0, 0.5, 1, 2 mg/L) were studied to observe the effect of E2 removal rate.
The results revealed that the shape of photocatalyst is spherical particles and the size is about 30 nm. The crystal structures of TiO2 includes anatase and rutile form. The band gap of TiO2 is 2.92 eV and the absorption wavelength is about 424 nm. The E2 degradstion efficiency increased as the dose of TiO2 increased. However, the better mineralization is in the 1 g/L TiO2. In the same case, higher pH can improve E2 degradation, but the better mineralizatiion of E2 is in the acidic conditions. The degradation rate of E2 was decreased when the initial concentration of E2 increased. The water parameters showed that increasing the concentration of those factors (NO3-, dissolved oxygen and Fe3 +) can improve the photocatalytic and mineralization efficiency.
其他識別: U0005-2406201313253300
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