Wang Hongjuan, Zhang Liqiu, Qi Fei, Wang Xue, Li Lu, Feng Li
J Nanosci Nanotechnol. 2014 Sep;14(9):7266-71. doi: 10.1166/jnn.2014.8942.
To discover the catalytic activity of sludge-corncob activated carbon in catalytic ozonation of Ibuprofen, the performance of sludge-corncob activated carbon and three selected commercial activated carbons as catalysts in catalytic ozonation was investigated. The observation indicates the degradation rate of Ibuprofen increases significantly in the presence of sludge-corncob activated carbon and the catalytic activity of sludge-corncob activated carbon is much higher than that of the other three commercial activated carbons. Ibuprofen's removal rate follows pseudo-first order kinetics model well. It is also found that the adsorption removal of Ibuprofen by sludge-corncob activated carbon is less than 30% after 40 min. And the removal efficiency of Ibuprofen in the hybrid ozone/sludge-corncob activated carbon system is higher than the sum of sludge-corncob activated carbon adsorption and ozonation alone, which is a supportive evidence for catalytic reaction. In addition, the results of radical scavenger experiments demonstrate that catalytic ozonation of Ibuprofen by sludge-corncob activated carbon follows a hydroxyl radical reaction pathway. During ozonation of Ibuprofen in the presence of activated carbon, ozone could be catalytically decomposed to form hydrogen peroxide, which can promote the formation of hydroxyl radical. The maximum amount of hydrogen peroxide occurs in the presence of sludge-corncob activated carbon, which can explain why sludge-corncob activated carbon has the best catalytic activity among four different activated carbons.
为探究污泥-玉米芯活性炭在布洛芬催化臭氧化反应中的催化活性，研究了污泥-玉米芯活性炭以及三种选定的商业活性炭作为催化剂在催化臭氧化反应中的性能。观察结果表明，在污泥-玉米芯活性炭存在的情况下，布洛芬的降解速率显著提高，且污泥-玉米芯活性炭的催化活性远高于其他三种商业活性炭。布洛芬的去除率很好地符合准一级动力学模型。还发现，40分钟后污泥-玉米芯活性炭对布洛芬的吸附去除率小于30%。并且在臭氧/污泥-玉米芯活性炭混合体系中布洛芬的去除效率高于污泥-玉米芯活性炭单独吸附和单独臭氧化去除率之和，这为催化反应提供了支持性证据。此外，自由基清除剂实验结果表明，污泥-玉米芯活性炭对布洛芬的催化臭氧化遵循羟基自由基反应途径。在活性炭存在下布洛芬臭氧化过程中，臭氧可被催化分解形成过氧化氢，过氧化氢可促进羟基自由基的形成。过氧化氢的最大量出现在污泥-玉米芯活性炭存在的情况下，这可以解释为什么污泥-玉米芯活性炭在四种不同活性炭中具有最佳的催化活性。
