Department of Environmental Health, School of Public Health, Seoul National University, Seoul, Korea.
Water Environ Res. 2012 Jul;84(7):554-61. doi: 10.2175/106143012x13373550427273.
We investigated the degradation of carbamazepine by photolysis/ultraviolet (UV)-C only and titanium dioxide photocatalysis. The degradation of carbamazepine by UV-only and titanium-dioxide-only (adsorption) reactions were inefficient, however, complete degradation of carbamazepine was observed by titanium dioxide photocatalysis within 30 min. The rate of degradation increased as initial carbamazepine concentration decreased, and the removal kinetics fit well with the Langmuir-Hinshelwood model. The addition of methanol, a radical scavenger, decreased carbamazepine removal, suggesting that the hydroxide radical played an important role during carbamazepine degradation. The addition of oxygen during titanium dioxide photocatalysis accelerated hydroxide radical production, thus improving mineralization activity. The photocatalytic degradation was more efficient at a higher pH, whereas the removal of carbamazepine and acridine (a major intermediate) were more efficient under aerobic conditions. The mineralization of carbamazepine during photocatalysis produced various ionic by-products such as ammonium and nitrate by way of nitrogen dioxide.
我们研究了光解/紫外线 (UV)-C 单独作用和二氧化钛光催化作用下卡马西平的降解。仅通过紫外线和仅二氧化钛（吸附）反应降解卡马西平的效率不高，然而，在 30 分钟内通过二氧化钛光催化作用完全降解了卡马西平。降解速率随着初始卡马西平浓度的降低而增加，去除动力学很好地符合 Langmuir-Hinshelwood 模型。甲醇的添加，一种自由基清除剂，降低了卡马西平的去除率，表明在卡马西平降解过程中羟基自由基发挥了重要作用。在二氧化钛光催化作用过程中添加氧气加速了羟基自由基的产生，从而提高了矿化活性。在较高 pH 值下，光催化降解更为有效，而在有氧条件下，卡马西平和吖啶（主要中间产物）的去除更为有效。光催化过程中卡马西平的矿化生成了各种离子副产物，如通过二氧化氮生成的铵和硝酸盐。
