Selection of supported cobalt substrates in the presence of oxone for the oxidation of monuron.
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.
Chu
W
W
Department of Civil and Structural Engineering, Research Centre for Environmental Technology and Management, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong. cewchu@polyu.edu.hk
Choy
W K
WK
Kwan
C Y
CY
D002411:Cation Exchange Resins; D003035:Cobalt / Q000737:chemistry*; D008782:Methylurea Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D013464:Sulfuric Acids / Q000737:chemistry*; D014466:Ultraviolet Rays
D002411:Cation Exchange Resins; D008782:Methylurea Compounds; D013464:Sulfuric Acids; D003035:Cobalt; C048813:potassium peroxymonosulfuric acid; C100088:monuron