State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, PR China; Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, PR China.
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, PR China.
Water Res. 2014 Oct 15;63:262-70. doi: 10.1016/j.watres.2014.06.028. Epub 2014 Jun 27.
TiO2 supported ruthenium nanoparticles, Ru/TiO2 (0.94‰ as Ru), was synthesized to catalyze permanganate oxidation for degrading emerging pollutants (EPs) with diverse organic moieties. The presence of 1.0 g L(-1) Ru/TiO2 increased the second order reaction rate constants of bisphenol A, diclofenac, acetaminophen, sulfamethoxazole, benzotriazole, carbamazepine, butylparaben, diclofenac, ciprofloxacin and aniline at mg L(-1) level (5.0 μM) by permanganate oxidation at pH 7.0 by 0.3-119 times. The second order reaction rate constants of EPs with permanganate or Ru/TiO2-catalyzed permanganate oxidation obtained at EPs concentration of mg L(-1) level (5.0 μM) underestimated those obtained at EPs concentration of μg L(-1) level (0.050 μM). Ru/TiO2-catalyzed permanganate could decompose a mixture of nine EPs at μg L(-1) level efficiently and the second order rate constant for each EP was not decreased due to the competition of other EPs. The toxicity tests revealed that Ru/TiO2-catalyzed permanganate oxidation was effective not only for elimination of EPs but also for detoxification. The removal rates of sulfamethoxazole by Ru/TiO2-catalyzed permanganate oxidation in ten successive cycles remained almost constant in ultrapure water and slightly decreased in Songhua river water since the sixth run, indicating the satisfactory stability of Ru/TiO2. Ru/TiO2-catalyzed permanganate oxidation was selective and could remove selected EPs spiked in real waters more efficiently than chlorination. Therefore, Ru/TiO2-catalyzed permanganate oxidation is promising for removing EPs with electron-rich moieties.
负载钌的二氧化钛纳米粒子（Ru/TiO2，Ru 的含量为 0.94‰）被合成用来催化过锰酸盐氧化，以降解具有不同有机官能团的新兴污染物（EPs）。在 pH 值为 7.0 时，当 1.0 g/L 的 Ru/TiO2 存在时，过锰酸盐氧化将 5.0 μM（mg/L 级，即 5.0 毫克每升）浓度的双酚 A、二氯芬酸、对乙酰氨基酚、磺胺甲恶唑、苯并三唑、卡马西平、丁基对羟基苯甲酸酯、二氯芬酸、环丙沙星和苯胺的二级反应速率常数提高了 0.3 到 119 倍。在 mg/L 级（5.0 μM）浓度下，通过过锰酸盐或 Ru/TiO2 催化的过锰酸盐氧化获得的 EPs 的二级反应速率常数，比在 μg/L 级（0.050 μM）浓度下获得的二级反应速率常数小。Ru/TiO2 催化的过锰酸盐能够有效地在 μg/L 级（0.050 μM）浓度下将 9 种 EP 的混合物分解，并且由于其他 EP 的竞争，每种 EP 的二级反应速率常数并没有降低。毒性测试表明，Ru/TiO2 催化的过锰酸盐氧化不仅对 EPs 的去除有效，而且对解毒也有效。在超纯水中，Ru/TiO2 催化的过锰酸盐氧化在十个连续循环中，磺胺甲恶唑的去除率几乎保持不变，而在第六次运行后，在松花江水样中略有下降，这表明 Ru/TiO2 具有令人满意的稳定性。Ru/TiO2 催化的过锰酸盐氧化具有选择性，能够比氯化更有效地去除实际水样中添加的选定的 EPs。因此，Ru/TiO2 催化的过锰酸盐氧化有望用于去除具有富电子官能团的 EPs。
