Kinetika Adsorpsi Zat Warna Malachite Green pada Silika Xerogel Hasil Sintesis Abu Terbang Adsorption Kinetics of Malachite Green Dye on Silica Xerogel Synthesized From Fly Ash

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Page Numbers: 2773-2784
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Published: Oct 14, 2025
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Authors:
Riska Himaylia Putri1*, Edi Nasra2
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Riska Himaylia Putri
Universitas Negeri Padang
Edi Nasra
Universitas Negeri Padang

Abstract

The increasing activity of the textile industry has led to a surge in wastewater containing synthetic dyes such as Malachite Green, which are toxic and resistant to natural degradation. This study aims to investigate the adsorption kinetics of Malachite Green using silica xerogel synthesized from fly ash as an environmentally friendly adsorbent. The synthesis was conducted using the sol-gel method, involving washing with 3 M HCl, extraction with 7 M NaOH, and re-precipitation using HCl until hydrogel formation, followed by drying to produce xerogel. XRF analysis showed an increase in SiO₂ content from 44.06% to 69.09%, indicating successful silica purification. Adsorption tests revealed a maximum capacity of 21.329 mg/g with an optimal contact time of 90 minutes. Kinetic analysis indicated that the adsorption process followed a pseudo-second-order model with an R² value of 0.983, suggesting a chemisorption mechanism involving interactions between silanol groups (-SiOH) on the xerogel surface and dye molecules. These findings demonstrate that fly ash-based silica xerogel has significant potential as an effective, sustainable, and economical adsorbent for dye wastewater treatment in the textile industry.

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How to Cite
Putri, R. H., & Nasra, E. (2025). Kinetika Adsorpsi Zat Warna Malachite Green pada Silika Xerogel Hasil Sintesis Abu Terbang. MASALIQ, 5(6), 2773-2784. https://doi.org/10.58578/masaliq.v5i6.7620

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Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.

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