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Canola meal-derived activated biochar treated with NaOH and CO2 as an effective tool for Cd removal
Journal of Chemical Technology and Biotechnology  (IF3.174),  Pub Date : 2021-09-07, DOI: 10.1002/jctb.6913
Affonso C Gonçalves, Daniel Schwantes, Alessandro L Braccini, Francisco Albornoz, Élio Conradi, Juliano Zimmermann

This research assessed the capacity for Cd2+ removal from water using canola meal-based adsorbents: canola meal chemically activated with 1 mol L–1 NaOH and pyrolyzed for 1 h at 500 °C (CAC) and the second product obtained with a similar process but with a second pyrolysis at 750 °C in CO2 flow (CAC-CO2). The materials were characterized by their chemical composition and thermal stability and using Fourier transform infrared spectroscopy, pH at point of zero charge (pHPZC) and scanning electron microscopy. Hydroxyl and carboxyl are the most likely surface functional groups responsible for adsorption.