Microporous activated carbon developed from KOH activated biomass waste: surface mechanistic study of methylene blue dye adsorption

Abstract

In this work, sugarcane bagasse waste (SBW) was used as a lignocellulosic precursor to develop a high surface area activated carbon (AC) by thermal treatment of the SBW impregnated with KOH. This sugarcane bagasse waste activated carbon (SBWAC) was characterized by means of crystallinity, porosity, surface morphology and functional groups availability. The SBWAC exhibited Type I isotherm which corresponds to microporosity with high specific surface area of 709.3 m2/g and 6.6 nm of mean pore diameter. Further application of SBWAC as an adsorbent for methylene blue (MB) dye removal demonstrated that the adsorption process closely followed the pseudo-second order kinetic and Freundlich isotherm models. On the other hand, thermodynamic study revealed the endothermic nature and spontaneity of MB dye adsorption on SBWAC with high acquired adsorption capacity (136.5 mg/g). The MB dye adsorption onto SBWAC possibly involved electrostatic interaction, H-bonding and π-π interaction. This work demonstrates SBW as a potential lignocellulosic precursor to produce high surface area AC that can potentially remove more cationic dyes from the aqueous environment.

Application of carbon from pomegranate husk for the removal of ibuprofen, cadmium and methylene blue from water

“…2 f) had unique openings and pores. This was attributed to the volatilization of some components during the carbonization process [ 40 , 41 , 50 ].

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Adsorption of crystal violet on activated bamboo fiber powder from water: preparation, characterization, kinetics and isotherms

“…After activation, the structure of BAC was observed to be distorted and deformed, and the material presented a finer stick and block structure, indicating that the surface structure of the carbon material was destroyed under the etching action of KOH at high temperatures. 33,34 The undulating fold structure on the surface of activated carbon can effectively increase the contact area between it and the target pollutant. In the process of bamboo fiber pyrolysis, a large amount of organic matter volatilizes, and its asymmetric space shrinks, resulting in the formation of a carbon skeleton.…”

High-Surface-Area-Activated Carbon Derived from Mango Peels and Seeds Wastes via Microwave-Induced ZnCl2 Activation for Adsorption of Methylene Blue Dye Molecules: Statistical Optimization and Mechanism

“…This rise in adsorption capacity was initially rapid, reaching 308.15 K, before slowing down to around 318.15 K. As the temperature rose, the bonds between the pores weakened, resulting in the pores expanding and the appearance of additional active sites. Additionally, heating caused an increase in the rate of MB diffusion into the pore [ 55 ].…”