Chu W, Choy W K, Kwan C Y
Department of Civil and Structural Engineering, Research Centre for Environmental Technology and Management, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong.
J Agric Food Chem. 2007 Jul 11;55(14):5708-13. doi: 10.1021/jf063754r. Epub 2007 Jun 14.
The immobilization of cobalt ion on different media to catalyze oxone has been investigated. A probe herbicide, Monuron, was effectively degraded by using Co2+/oxone systems. For Co2+ supported on zeolite, 100% of Monuron could be removed within a 10 min reaction time. However, the recycling of the spent Co-zeolite catalyst using various posttreatments did not give a promising result. This is likely because the zeolite particles in solution have blocked and significantly attenuated the incident UV light from reducing Co3+ to Co2+. On the contrary, the use of cationic resin has minimized these problems. In the process of Co-resin/oxone/UV, faster Monuron decay could be achieved than that in the dark reaction. In the presence of UV, a significant drop of total organic carbon (TOC) was also observed in this approach suggesting an effective and clean process for Monuron mineralization.
研究了钴离子在不同介质上的固定化以催化过氧单磺酸钾。一种探针除草剂灭草隆，通过使用Co²⁺/过氧单磺酸钾体系可有效降解。对于负载在沸石上的Co²⁺，在10分钟的反应时间内可去除100%的灭草隆。然而，使用各种后处理方法对用过的Co-沸石催化剂进行循环利用并未得到理想结果。这可能是因为溶液中的沸石颗粒阻挡并显著衰减了使Co³⁺还原为Co²⁺的入射紫外光。相反，使用阳离子树脂可将这些问题最小化。在Co-树脂/过氧单磺酸钾/紫外光过程中，灭草隆的降解速度比暗反应中更快。在紫外光存在下，该方法中还观察到总有机碳（TOC）显著下降，表明这是一种有效且清洁的灭草隆矿化过程。
