Acid-activated sintering process red mud (ASRM) was investigated as an adsorbent for removal of two cationic
dyes, malachite green (MG) and crystal violet (CV), from aqueous solution. The adsorption behaviors of
dyes were studied in batch experiments as a function of contact time, pH value, initial dye concentration and
temperature. The solution with pH higher than 3.2 was favorable for the adsorption of MG and CV on the
ASRM. Adsorption data fitted better using the Langmuir isotherm, and the calculated maximum adsorption
capacities were 336.4 mg/g and 60.5 mg/g for MG and CV at 25 °C, respectively. The analysis of the thermodynamic
parameter, ΔH, indicated that the adsorption process of MG was endothermic, whereas that of CV was
exothermic. The kinetic data were better described by pseudo-second order kinetic model. These results indicated
that ASRM exhibited good adsorption ability and can be used as an attractive adsorbent for the removal
of cationic dyes, especially MG.
Acid-activated sintering process red mud (ASRM) was investigated as an adsorbent for removal of two cationicdyes, malachite green (MG) and crystal violet (CV), from aqueous solution. The adsorption behaviors ofdyes were studied in batch experiments as a function of contact time, pH value, initial dye concentration andtemperature. The solution with pH higher than 3.2 was favorable for the adsorption of MG and CV on theASRM. Adsorption data fitted better using the Langmuir isotherm, and the calculated maximum adsorptioncapacities were 336.4 mg/g and 60.5 mg/g for MG and CV at 25 °C, respectively. The analysis of the thermodynamicparameter, ΔH, indicated that the adsorption process of MG was endothermic, whereas that of CV wasexothermic. The kinetic data were better described by pseudo-second order kinetic model. These results indicatedthat ASRM exhibited good adsorption ability and can be used as an attractive adsorbent for the removalof cationic dyes, especially MG.
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