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Removal of ethylenthiourea and 1,2,4-triazole pesticide metabolites from water by adsorption in commercial activated carbons

Author:
Amorim, Camila C., Bottrel, Sue Ellen C., Costa, Elizângela P., Teixeira, Ana Paula C., Leão, Mônica M.D.
Source:
Journal of environmental science and health 2013 v.48 no.3 pp. 183-190
ISSN:
1532-4109
Subject:
X-radiation, activated carbon, adsorption, cattle, desorption, metabolites, models, nitrogen, pesticides, scanning electron microscopy, sorption isotherms, spectroscopy, surface area
Abstract:
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.
Agid:
265322