“…These residues can be used for the synthesis of activated carbon, are rich in oxygen and nitrogen surface groups, and can be used in natura or activated with desired reactive groups. 136,137 Limitations Our strategy was mapped using two Web of Science databases (SCI-E and ESCI), Scopus, PubMed and SciELO. We chose not to use scientific evidence, such as theses and dissertations, committee or government reports, documents from congresses, conferences and seminars, or ongoing research.…”