The Adosrption Study for the Removal of Rhodamine-B from Artificial Aquatic Solution by using Activated Hygrophila auriculata Nano Carbon

Abstract

To study the adsorption of Rhodamine-B dye (Rh-B) from artificial aquatic solution by using activated Hygrophila auriculata nano carbon under batch adsorption mode. Activated nano carbon was synthesized from Hygrophila auriculata and it was characterised by analytical methods such as BET(BJH), XRD, FTIR, and SEM with EDX. The equilibrium adsorption data were calculated and it was interrelated using Freundlich, Langmuir, Temkin, Hurkins-Jura, Halsay, Radlich-Peterson, Dubinin-Radushkevich, Jovanovic, and Brunauer Emmett Teller (BET) isotherm models. The kinetics of the adsorption technique was examined via pseudo- second order, Elovich mode and intraparticle diffusion methods. Thermodynamic parameters like change of free energy (ΔG°), change of enthalpy (ΔH°), and change of entropy (ΔS°) has been estimated. The value of regression coefficient (R2) indicates that Langmuir isotherm suitable to designate the process. The maximum adsorption capacity of monolayer is 204.11mg/g at 40°C. Based on the R2 value the adsorption mechanism was fitting to the pseudo-second order model. Thermodynamic factors obtained (ΔG° ranged from -4429.50 to -640.26 kJ/mol; ΔH° ranged from 5.38 to 12.84 kJ/mol; and ΔS° ranged from 19.82 to 50.23 J/K/mol, correspondingly) representing the Rh-B dye removal from artificial aquatic solutions by AHANC is there spontaneous, endothermic and possible in nature respectively. The outcomes point out that AHANC could be used as low-price and an effective adsorbent for the removal of Rh-B dye from artificial aqueous solution.