Journal
BIOINTERFACE RESEARCH IN APPLIED CHEMISTRY
Volume 11, Issue 1, Pages 7410-7421Publisher
BIOINTERFACE RESEARCH APPLIED CHEMISTRY
DOI: 10.33263/BRIAC111.74107421
Keywords
Methylene blue; malachite green; waste activated carbon; adsorption capacity; adsorption isotherm; intraparticle diffusion
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In this study, Waste Activated Carbon (WAC) from domestic water filter was used for the removal of two cationic dyes. The adsorption was found to be exothermic, spontaneous, and favorable, with optimum contact times, Langmuir isotherm and pseudo-second-order kinetics being well obeyed.
In the present investigation, Waste Activated Carbon (WAC) collected from domestic water filter has been used for the removal of two cationic dyes methylene blue (MB) and malachite green (MG) from synthetic solution. The surface of WAC is characterized to know the mechanism of adsorption reaction and the effect of different adsorption parameters like pH, temperature, contact period, adsorbate and adsorbent doses are also studied for the said adsorption study. The optimum contact times for MB and MG adsorption on WAC are 60 and 120 minutes respectively, whereas pH is having no significant effect on adsorption. However, % adsorption increases slowly with the increase of pH from 2.5 to 7. Adsorption of both the dyes on WAC is exothermic, spontaneous, and favorable in nature. Langmuir isotherm and pseudo-second-order kinetics are obeyed well. Langmuir's maximum monolayer adsorption capacities are found to be 15.38 and 18.87mg/g for MB and MG, respectively. Temkin isotherm, and Morris-Weber equations are also obeyed well. Temkin's isotherm concludes the physicochemical nature of adsorption, and Morris Weber equation indicates possibilities of intraparticle diffusion. The interaction between these two cationic dyes and WAC can be explained through electrostatic force of attraction or by hydrogen bonding.
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