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Type: Artigo de periódico
Title: Oxidation of sodium dodecylbenzenesulfonate with chrysotile: On-line monitoring by membrane introduction mass spectrometry
Author: Fachini, A
Mendes, MA
Joekes, I
Eberlin, MN
Abstract: Chrysotile was tested for anionic surfactant (SDBS) removal from aqueous solutions. Results showed that the reduction was due to a catalytic process onto the chrysotile surface, which is formed of hydroxyl groups. Trap and release membrane introduction mass spectrometry using a modified direct insertion membrane probe (DIMP-T&R-MIMS) was used to monitor on-line SDBS oxidation by air in an aqueous alkaline media containing chrysotile. It was possible to estimate the amount Of CO2 formed in SDBS catalyzed reaction through quantification Of CO2 formed by the hydrolysis Of MgCO3. A mass balance for the SDBS reaction is proposed. DIMP-T&R-MIMS monitoring identified no VOCs or SVOCs as degradation intermediates, but CO2 was detected to account for SDBS degradation. Hence, simple chrysotile adsorption is excluded as a main process of SDBS consumption, and a 'SDBS in-CO2 out' mechanism on the chrysotile surface accounts for the experimental observations.
Subject: surfactant degradation
CO2 determination
online monitoring
membrane probe
Country: Alemanha
Editor: Springer Heidelberg
Rights: fechado
Identifier DOI: 10.1007/s11743-007-1032-8
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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