探討還原性物質於連續式光催化系統氧化非類固醇抗發炎藥劑影響之研究

Removal of non-steroidal anti-inflammatory drugs (NSAIDs) with different electron scavengers by fluidized TiO2 catalyst bed reactor.

林秉蓮(Bing-Lian Lin)

指導教授 ： 陳孝行

國立臺北科技大學/工程學院/環境工程與管理研究所/碩士(2012年)

https://doi.org/10.6841/NTUT.2012.00482

摘要

本研究利用 TiO2 具備同步氧化還原的特性，針對存在自然水體中的微量非類固醇抗發炎劑 Acetaminophen（APAP）進行研究，期望能在短時間內有效率的去除存在水體中微量藥物，以利於往後實廠上的應用。本研究分成兩部份：首先先探討各項光催因子對於 APAP去除率之影響，探討的參數包含了初始 pH 、HRT、含氧量、TiO2 劑量，第二部份即為探討添加不同莫耳比之 Cr(VI) 和 NO3- 作為還原性物質，對於 APAP 去除率之影響；本研究致力於探討還原性物質對於 APAP 在光催化各項影響因子中的降解變化情形。
於各項光催因子探討中可發現，當 HRT＝40 min、初始 pH＝2、曝氧氣、 TiO2＝0.5 g/L、light intensity＝2.5 W/m2、uv＝254 nm 之光催條件為最佳操作條件，此時 APAP 之去除率可達 98.87 %。
若 APAP 溶液中存在還原性物質 Cr(VI) 時能加速 APAP 之降解速度，但其去除率（91.70 %）會略低於僅有 APAP 存在的情況下；若還原性物質為 NO3- 時，雖然無法加速 APAP 降解速度，但卻可略微增加 APAP 之去除率（99.08 %）。
APAP 經光催化反應後其 TOC 值呈現跳動現象，經由 GC/MS 分析 APAP 光催化後產生之中間產物為醇類、醚類、酯類、酸類，但以醇類型式存在較多，而醇類會有逸散的現象發生，造成 TOC 跳動。

關鍵字

對乙醯氨基苯酚 ； 二氧化鈦 ； 光催化 ； 六價鉻 ； 硝酸鹽 ； 連續式 ； MOPAC

並列摘要

The presence of non-steroidal anti-inflammatory drugs (NSAIDs) has been reported as emerging contaminants in many countries. Acetaminophen a NSAIDs with relative high concentrations in surface water, were chosen in the study. The aim of this study was to remove the emerging contaminants of acetaminophen by TiO2 and to discuss the effect of reductive substances(Cr(VI), NO3-), which co exists in acetaminophen solution.
There are two parts in this study. The first part is to find the optimum removal efficiency of acetaminophen under different parameters(hydraulic retention time (HRT), initial pH, aeration and TiO2 dosage). The second part is to discuss the effect of Cr(VI) and NO3- in acetaminophen solution under the optimum operation conditions.
In the first part, acetaminophen had the highest removal efficiency of 98.77 % under the operating conditions of acetaminophen＝10 mg/L, HRT＝40 min, initial pH＝2, aeration with oxygen and TiO2＝0.5 g/L.
Compared with the removal efficiency that only acetaminophen existed, the removal efficiency of the solution that Cr(VI) existed was worse since, both acetaminophen and Cr(VI) were photocatalyzed. But the acetaminophen degradation rate was faster with the presence of Cr(VI). If the NO3- existed in the acetaminophen solution, after 8 hr of photocatalysis, the acetaminophen removal efficiency reached 99.08%. Compare with the removal efficiency that only acetaminophen existed, the removal efficiency of acetaminophen with the presence of NO3- was better.
In this study, TOC was analyzed to determine the mineralization of acetaminophen, but the TOC values were fluctuated. The reason was that the acetaminophen after photocatalysis produced some intermediates. Such as alcohol, ether, ester and acid, analyzed by GC/MS. Since more alcohol was observe than the rest intermediates, and alcohol in the solution might vaporize into air, causing fluctuatation of the TOC values.

並列關鍵字

Acetaminophen ； TiO2 ； photocatalysis ； Cr(VI), NO3- ； continuous system ； MOPAC

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