Adsorptive performance of MWCNTs for simultaneous cationic and anionic dyes removal; kinetics, thermodynamics and isotherm study

2021 Turkish journal of chemistry  
1 Disposal of contaminated wastewater causes many serious problems especially when it gets 2 mixed with the ground and seawater. It is, therefore, important to apply any remedial action to 3 eradicate dangerous pollutants from the aqueous effluents and to avoid exposure of this 4 wastewater to aquatic life. The research results discussed herein deal with the removal of 5 Rhodamine B (RhB) and Congo Red (CR) dye from wastewater by using Multi-walled carbon 6 nanotubes (MWCNTs) as an adsorbent.
more » ... as an adsorbent. Different factors like solid dosage, initial pH and 7 concentration, time and temperature were studied to understand the behaviour and mechanism of 8 adsorption. The maximum adsorption capacity in case of a single component system was found 9 to be 302 mg/g and 300 mg/g for Congo Red and Rhodamine B, respectively. Moreover, the 10 mechanism of adsorption was best described by a pseudo-second-order kinetic model. 11 Thermodynamic parameters showed that adsorption of CR and RhB was exothermic when these 12 were removed from a single dye system. However, the overall process became endothermic for 13 concurrent removal of both dyes from the solution. The research results showed that the 14 MWCNTs could successfully be utilized to remove the dye from the industrial wastewater. 15
doi:10.3906/kim-2005-12 fatcat:jwciiw3cwjfstob3pg44w4ik5m