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The ability of lignite or brown coal to adsorb basic dyes in single and multicomponent systems is analysed using IAST. The single component isotherms were correlated well using the Langmuir (L) and Freundlich (F) isotherms and the same isotherms, as L-L, F-F, L-F and F-L were used to model the binary dye-lignite isotherms. A sensitivity analysis was carried out on the Langmuir constants in the IAST.
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