title: Selection of supported cobalt substrates in the presence of oxone for the oxidation of monuron.
abstract: 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.
authors.affiliation: 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
authors.forename: W
authors.initials: W
authors.lastname: Chu
authors.forename: W K
authors.initials: WK
authors.lastname: Choy
authors.forename: C Y
authors.initials: CY
authors.lastname: Kwan
mesh_terms: D002411:Cation Exchange Resins; D003035:Cobalt / Q000737:chemistry*; D008782:Methylurea Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D013464:Sulfuric Acids / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D002411:Cation Exchange Resins; D008782:Methylurea Compounds; D013464:Sulfuric Acids; D003035:Cobalt; C048813:potassium peroxymonosulfuric acid; C100088:monuron