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[en] Highlights: • Acid treatment generates oxidized species for all the temperatures investigated. • At high treatment temperatures a contribution of a disorder graphene peak is observed. • The amount of the oxidized species varies with the treatment temperature. • There is deterioration in the walls of the carbon nanotubes after acid treatment. • MWCNT treated at 110 °C present greater mobility at acid pH than the others. We present a study of sulfonitric treatment and its effect on MWCNTs at different temperatures (90, 110, 130 and 150°C) using DRX, XPS, FTIR, Raman spectroscopy, TEM and zeta potential. It was found that oxidation starts with the C-C and C-H bonds generating different oxidized groups from alcohol to carboxylic acid, following a sequential oxidation. Given that heterocoagulation needs a maximum zeta potential gap between the ceramic and the MWCNT surface and it significantly exist a risk of manipulate acids at high temperature it is recommended to use acid treatment of CNT at 110 °C for generating ceramic composites by heterocoagulation.