Avaliação da adsorção do herbicida 2,4-D em carvão ativado em pó e granular por meio de análises de isotermas de adsorção utilizando diferentes qualidades de água

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

11/06/2012

RESUMO

This research aims to evaluate the activated carbon (AC) physical-chemicals characteristics generated from coconuts peel and pinus and associate them to 2,4-D herbicide adsorption capacity of studied activated carbons by adsorption isotherms assay in destilated and deionized water (DDW) and filtered water (FW) from Freundlich and Langmuir models, as well as verifying the carbon granulometry reduction interference on the 2,4-D adsorption capacity. Firstly, the DDW was used to evaluate the AC herbicide adsorption efficiency without any interferent which might compete with 2,4-D and to compare the results obtained from DDW with FW results. 2,4-D pH solution (6,86) was fitted to real operational values/conditions of Carapina Water Treatment Plant (WTP) ES, which provide the FW used in this study. The research used vegetable AC provided by two Brazilian producers. One company provided GAC and PAC derivated from coconut peel. The GAC used with the normal granulometry (08x30 mesh) was named CA-1, and with a granulometry lower than 325 mesh was named CA-2. CAP was named CA-3. The another company provided PAC derivated from pinus, which was named CA-4. CA-3 showed higher maximum adsorption capacity (qAmax). The physical-chemicals analysis did not contributed to the most efficient coal selection and, statistically, there were not differences between DDW and FW assays

ASSUNTO(S)

herbicidas carbono ativado adsorção herbicides activated carbon adsorption engenharias

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