Chan K H, Chu W
Department of Civil and Structural Engineering, Research Centre for Environmental Technology and Management, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China.
Water Res. 2009 May;43(9):2513-21. doi: 10.1016/j.watres.2009.02.029. Epub 2009 Feb 27.
The degradation of atrazine (ATZ) by cobalt-mediated activation of peroxymonosulfate (PMS) has been studied in this work. For the homogenous process, different cobalt counteranions: cobalt(II) nitrate Co(NO(3))(2), cobalt(II) sulfate CoSO(4), cobalt(II) chloride CoCl(2), and cobalt(II) acetate Co(CH(3)COO)(2), have been examined. The inhibitory effect was observed in the process initiated by CoCl(2). For the pH test, wide range of pH level (2-10) has been investigated. It was found that the higher rates were obtained in the normal pH levels. At extreme pH levels, the process was impeded by inactivation of PMS at acidic pH and prohibited by precipitation at basic pH. On the other hand, the recycling capability of cobalt oxide and the oxidative potential of cobalt-immobilized titanium dioxide Co-TiO(2) catalyst were analyzed in the heterogeneous process. It was found that the higher the cobalt content in the catalyst, the better the removal performance was resulted. At last, the Co-TiO(2) catalyst synthesized in this work was found to be very effective in transforming ATZ as well as its intermediate in the presence of UV-vis irradiation.
本研究考察了钴介导活化过一硫酸盐（PMS）降解莠去津（ATZ）的效果。对于均相过程，研究了不同的钴抗衡阴离子：硝酸钴Co(NO₃)₂、硫酸钴CoSO₄、氯化钴CoCl₂和醋酸钴Co(CH₃COO)₂。在由CoCl₂引发的过程中观察到了抑制作用。对于pH测试，研究了较宽的pH范围（2 - 10）。结果发现，在正常pH水平下能获得较高的降解速率。在极端pH水平下，该过程在酸性pH时因PMS失活而受阻，在碱性pH时因沉淀而受到抑制。另一方面，在非均相过程中分析了氧化钴的循环能力和负载钴的二氧化钛Co-TiO₂催化剂的氧化潜力。结果发现，催化剂中钴含量越高，去除性能越好。最后，发现本工作中合成的Co-TiO₂催化剂在紫外-可见光照射下对转化ATZ及其中间体非常有效。
