紫外光催化過硫酸鹽及過氧化氫降解乙醯胺酚

乙醯胺酚(Acetaminophen, ACE)於1950年代推出，是全球使用最廣泛的退燒藥和止痛藥之一，ACE是一種普遍存在且高度被利用的非處方藥物。儘管廢水處理廠可去除90%以上的ACE，但環境中仍會檢測到微量的ACE。過硫酸鹽(Persulfate)活化技術因其具有較過氧化氫(H2O2) (E0=1.77V)高的氧化還原電位(E0=2.01V)，而受到越來越多的關注。過硫酸鹽氧化劑具有一定的穩定性，且符合經濟成本。本研究目的主要探討紫外光催化不同濃度的過硫酸鹽和過氧化氫(H2O2)，以及過硫酸鹽結合過氧化氫系統對於ACE降解之影響。結果顯示，不同濃度的過硫酸鹽在UV照射下能有效去除ACE。在過硫酸鹽濃度為75、125和250 mg/L達到ACE去除率99.9%所需之反應時間分別為360、120和40分鐘。UV/H2O2對ACE的去除率比UV/Persulfate較差，過氧化氫濃度250 mg/L反應時間360分鐘去除率只有68.4%。氫氧根自由基的存在有助於過硫酸鹽的活化，過硫酸鹽濃度50 mg/L反應時間360分鐘去除率98.5%，額外添加10 mg/L過氧化氫可在反應時間120分鐘達到99.9%之ACE去除率，而額外添加50 mg/L則需反應時間180分鐘才可達到99.9%去除率。添加較多所需時間較長，推測可能是過量的過氧化氫可以清除HO．，而導致活化效果變差。對ACE的去除效率依序為：UV/Persulfate + H2O2 > UV/Persulfate > UV/H2O2。

關鍵字

紫外光；乙醯胺酚；過硫酸鹽；過氧化氫

並列摘要

Acetaminophen (ACE), introduced in the 1950s, is the main ingredient in major cold medicines, which is widely used to reduce fever and pain. ACE is a ubiquitous and highly exploited over-the-counter drug. Although sewage treatment plant can remove more than 90% of ACE, it is still detected at concentration of ng/L-μg/L in the environment. Persulfate activation technology has received increasing attention because of its higher redox potential (E0 = 2.01 V) than hydrogen peroxide (H2O2) (E0 = 1.77 V). Persulfate is a stable and economical oxidant. The purpose of this study is to investigate the effects of various concentrations of persulfate and H2O2 activated by UV on the degradation of ACE. The results show that various concentrations of persulfate activated by UV can effectively remove ACE. The reaction time to achieve the ACE removal rate of 99.9% was 360, 120, and 40 minuys at persulfate concentrations of 75, 125, and 250 mg/L, respectively. The removal rate of ACE by UV/H2O2 was worse than that by UV/Persulfate. At H2O2 concentration of 250 mg/L, the ACE removal rate by UV/H2O2 was 68.4% after reaction time of 360 minutes. Persulfate combined with H2O2 can effectively improve the removal of ACE. The ACE removal rate was 98.5% at persulfate concentration of 50 mg/L. Addition of 10 mg/L H2O2 into persulfate solution enhanced the ACE removal rate to 99.9% after reaction time of 120 minutes, while additionof 50 mg/L H2O2, the ACE removal rate reached 99.9% after reaction time of 180 minutes. Addition of higher concentration of H2O2 takes a longer reaction time, and it is speculated that excess H2O2 may remove HO．, resulting in poor activation effect. The ACE removal rate is in the order of UV/Persulfate + H2O2, UV/Persulfate, and UV/H2O2.