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ARTICLE

Adsorption of Malachite Green Using Activated Carbon from Mangosteen Peel: Optimization Using Box-Behnken Design

Nabila Eka Yuningsih, Latifa Ariani, Suprapto Suprapto, Ita Ulfin, Harmami Harmami, Hendro Juwono, Yatim Lailun Ni’mah*
Department of Chemistry, Faculty of Science and Data Analytics, Institute Technology of Sepuluh Nopember, Surabaya, 60111, Indonesia
* Corresponding Author: Yatim Lailun Ni’mah. Email: email
(This article belongs to the Special Issue: Special Issue in Celebration of JRM 10 Years)

Journal of Renewable Materials https://doi.org/10.32604/jrm.2024.049109

Received 28 December 2023; Accepted 08 March 2024; Published online 10 April 2024

Abstract

In this research, activated carbon from mangosteen peel has been synthesized using sulfuric acid as an activator. The adsorption performance of the activated carbon was optimized using malachite green dye as absorbate. Malachite green dye waste is a toxic and non-biodegradable material that damages the environment. Optimization of adsorption processes was carried out using Response Surface Methodology (RSM) with a Box-Behnken Design (BBD). The synthesized activated carbon was characterized using FTIR and SEM instruments. The FTIR spectra confirmed the presence of a sulfonate group (-SO3H) in the activated carbon, indicating that the activation process using sulfuric acid was successful. SEM characterization shows that activated carbon has porous morphology. Optimization was carried out for three adsorption parameters, namely contact time (20, 60, and 120 min), adsorbent mass (0.005, 0.025, and 0.05 g), and initial concentration of malachite green solution (5, 50, and 100 mg·L-1). The concentration of the malachite green solution was determined using a UV-Vis spectrophotometer at the maximum wavelength of malachite green, 618 nm. The optimum of malachite green adsorption using mangosteen peel activated carbon was obtained at a contact time of 80 min, an adsorbent mass of 0.032 g, and malachite green initial concentration of 25 mg·L-1, with a maximum removal percentage and maximum adsorption capacity of 93.66% and 19.345 mg·g-1, respectively.

Keywords

Response surface methodology; dyes; activated carbon; experimental design

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