Isotherm and Kinetic Studies of Malachite Green by NaOH-Activated Carbon Made from Apple Waste

Narayani Balasubramaniam; Isana Supiah Yosephine Louise

doi:10.22146/ijc.104046

Isotherm and Kinetic Studies of Malachite Green by NaOH-Activated Carbon Made from Apple Waste

https://doi.org/10.22146/ijc.104046

Narayani Balasubramaniam^(1*), Isana Supiah Yosephine Louise⁽²⁾

(1) Department of Chemistry Education, Universitas Negeri Yogyakarta, Jl. Colombo No. 1, Yogyakarta 55281, Indonesia
(2) Department of Chemistry Education, Universitas Negeri Yogyakarta, Jl. Colombo No. 1, Yogyakarta 55281, Indonesia
(*) Corresponding Author

Abstract

Using textile dyes that seem to reach new heights has caused the waste produced to skyrocket. One is malachite green, which earned its popularity due to its vibrancy. However, the impact of malachite green has proven to be an adversary to the environment, aquaculture, and health. This experiment aims to analyze the removal of malachite green through adsorption by using activated carbon made from apple waste. Some activated carbon underwent activation with NaOH 0.5 M. We sieved these activated carbons into a 100 mesh and used the batch method to test them for optimal conditions. The concentration at equilibrium was analyzed using cyclic voltammetry. The results of these experiments are modeled into isotherm and kinetics models to help describe the adsorption. SEM-EDS, FTIR, and SAA also characterized the adsorbent samples. We found the NaOH-activated carbon to be the most efficient adsorbent, with optimum conditions of 0.3 g, 20 min, and 200 ppm. The adsorption data followed the Dubinin-Radushkevich isotherm and the pseudo second-order kinetics.

Keywords

activated carbon; adsorption; apple waste; malachite green

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References

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DOI: https://doi.org/10.22146/ijc.104046