The Adsorption energy (E) obtained from Dubinin–Radushkevich (D-R) isotherm was 6.11 kJ/mol suggesting that the uptake of RhB onto RH was by physisorption.
Obtained maximum monolayer adsorption capacity (qmax) for the uptake of RhB onto RH has been compared with qmax for other adsorbents available in the literatures (Table 5).
RH apparently exhibits higher performance than other adsorbents earlier reported.