Adsorption of basic dyes from aqueous solution onto activated carbons

By E. N. E. Qada, S. Allen, G. Walker. 2008

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Removal of dyes from aqueous solutions with untreated coffee residues as potential low-cost adsorbents: Equilibrium, reuse and thermodynamic approach (2012, background): “However, although activated carbon is a preferred adsorbent [8,9], its widespread use is restricted due to its high cost [10].”
Adsorption of methylene blue on low-cost adsorbents: a review. (2010, background): “Though commercially available activated carbon (CAC) are usully derived from natural materials such as biomass, lignite or coal, ut almost any carbonaceous materials may be used as precuror for the preparation of carbon adsorbents [43–52], because of ts availability and cheapness, coal is the most c”
Hydrothermal conversion of biomass waste to activated carbon with high porosity: a review. (2016, background): “Activation of suitable precursors such as lignocellulosic biomass results in formation of highly porous activated carbons whose large surface areas facilitate their performance as adsorbents [17–26].”