“…The Langmuir and Freundlich constants obtained are reported in Table 3, where they are compared with the same parameters calculated for other bio-adsorbent materials reported elsewhere. The comparison shows that YM has a higher adsorption capacity (q max ) than most of the other bio-adsorbents, such as chaff [43], peanut hull [44], banana peel [45], orange peel [45], rice husk [46], apricot shells [47], wheat shells [48], spent coffee grounds [49] and passion fruit waste [50]. Only the study conducted by Uddin et al on tea wastes [51] reveals a higher adsorption capacity than yerba mate, which was also promoted by the high specific surface area of the particles adopted in the adsorption tests (180-300 µm) compared to the material tested in the present study.…”