Removal of ethylenthiourea and 1,2,4-triazole pesticide metabolites from water by adsorption in commercial activated carbons.
This study evaluated the adsorption capacity of ethylenthiourea (ETU) and 1H-1,2,4-triazole (1,2,4-T) for two commercial activated carbons: charcoal-powdered activated carbon (CPAC) and bovine bone-powdered activated carbon (BPAC). The tests were conducted at a bench scale, with ETU and 1,2,4-T diluted in water, for isotherm and adsorption kinetic studies. The removal of the compounds was accompanied by a total organic carbon (TOC) analysis and ultraviolet (UV) reduction analysis. The coals were characterized by their surface area using nitrogen adsorption/desorption, by a scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM/EDS) and by a zero charge point analysis (pHpcz). The results showed that adsorption kinetics followed a pseudo-second-order model for both coals, and the adsorption isotherms for CPAC and BPAC were adjusted to the Langmuir and Freundlich isotherms, respectively. The CPAC removed approximately 77% of the ETU and 76% of the 1,2,4-T. The BPAC was ineffective at removing the contaminants.
Department of Sanitary and Environmental Engineering, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil. camila@desa.ufmg.br
Camila C
CC
Amorim
Sue Ellen C
SE
Bottrel
Elizângela P
EP
Costa
Ana Paula C
AP
Teixeira
Mônica M D
MM
Leão
D000327:Adsorption; D000818:Animals; D002417:Cattle; D002606:Charcoal / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D007700:Kinetics; D010575:Pesticides / Q000737:chemistry*; D014230:Triazoles / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D010575:Pesticides; D014230:Triazoles; D014874:Water Pollutants, Chemical; D002606:Charcoal; C045575:1,2,4-triazole