Work

Crayfish shell biochar for methyl violet adsorption: Equilibrium and kinetic studies

Year: 2024

Type: article

Abstract: This work was aimed to establish the equilibrium and kinetics of methyl violet removal onto crayfish shell biochars. The biochars were prepared through pyrolysis at 500, 650 and 800 ℃ for 1.5 h. The biochars were labelled as CS500, CS650 and CS800, respectively. All biochars are highly mesoporous with CS650 exhibits a higher surface area of 665 m 2 /g. The adsorption results are tied up with the physiochemical properties of biochars. The CS800 displays the maximum dye capacity at 1079 mg/g. The performance of biochars is given in the order of, CS800 > CS650 > CS500. The equilibrium of methyl violet adsorption was best described by modified Langmuir isotherm, while the kinetic data obeyed pseudo-second-order model. The removal of methyl violet is governed partly by precipitation onto crayfish shell biochars. To conclude, the crayfish shell is a potential feedstock of biochar for dye wastewater treatment.

Source: Next Sustainability

DOI: 10.1016/j.nxsust.2024.100093