| 酰胺咪嗪光降解效能与机制及其影响因素研究 |
| 摘要点击 2269 全文点击 1442 投稿时间：2012-02-11 修订日期：2012-05-09 |
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| 中文关键词 酰胺咪嗪 光降解 硝酸根离子 碳酸氢根离子 腐殖酸 |
| 英文关键词 carbamazepine(CBZ) photodegradation nitrate bicarbonateradical humic acid |
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| 中文摘要 |
| 以氙灯为模拟光源,研究了酰胺咪嗪(carbamazepine,CBZ)在纯水中的光降解效能与机制,并考察了硝酸根离子(NO3-)、碳酸氢根离子(HCO3-)和腐殖酸(HA)对其光降解速率的影响. 结果表明,纯水中CBZ的光降解符合假一级反应动力学; 在光强为1200 mW·cm-2、CBZ初始浓度为200 μg·L-1时,CBZ的光降解速率常数为0.0287 min-1,半衰期为24.15 min; 纯水中CBZ的去除是以自敏化光降解反应为主,其中单线态氧(1 O2)参与的自敏化光氧化反应贡献率较大,为75.3%,而羟基自由基(·OH)的贡献率较小,为5.6%; 在本试验条件下,NO3-、HCO3-以及HA浓度的增加都会对CBZ的光降解过程产生抑制,其中NO3-的抑制作用最为明显,当加入的NO3-浓度为0.5 mmol·L-1时,CBZ的半衰期延长为433.22 min,约为不加NO3-时的18倍. |
| 英文摘要 |
| The photodegradation performance and mechanisms of carbamazepine (CBZ) in pure water were investigated in simulated irradiation using a 300 W Xenon lamp. Batch experiments were carried out to explore the influences of nitrate (NO3-), bicarbonateradical (HCO3-) and humic acid (HA) on CBZ's photodegradation. The results demonstrate that the photodegradation of CBZ in pure water follows a pseudo-first-order kinetics. When the irradiation intensity was 1200 mW·cm-2 and the initial concentration of CBZ was 200 μg·L-1, the CBZ's photodegradation rate constant and half-life were 0.0287 min-1 and 24.15 min, respectively. Sensitization degradation gave the priority to the photodegradation of CBZ, and the contribution of singlet oxygen (1 O2) was 75.3% which was higher than hydroxyl radical (·OH) of 5.6%. Under the conditions of this study, the increase of NO3-, HCO3- and HA concentration inhibited CBZ's photodegradation. Among of which, the inhibition effect of NO3- on CBZ's photodegradation was the most significant. When the concentration of NO3-was up to 0.5 mmol·L-1,the half-life of CBZ was prolonged to 433.22 min, which was 18 times as that in pure water without NO3-. |
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