Mining of Mineral Deposits

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The investigation of different decolorization mechanism of methylene blue in the system with and without photocatalyst made from Indonesia laterite ore

Anisya Lisdiana1, Herkuswyna Isnaniyah Wahab1, Eki Naidania Dida1, Monna Rozana2, Mutia Dewi Yuniati1, Solihin Solihin1

1Research Center for Geological Resource, National Research and Innovation Agency, KST Samaun Samadikun, Komplek BRIN Jl Sangkuriang, Bandung, Indonesia

2Research Center for Environmental and Clean Technology, National Research and Innovation Agency, KST Samaun Samadikun, Komplek BRIN Jl Sangkuriang, Bandung, Indonesia


Min. miner. depos. 2025, 19(2):20-26


https://doi.org/10.33271/mining19.02.020

Full text (PDF)


      ABSTRACT

      Purpose. This work aims to investigate the performance of photocatalyst made from laterite ore to decolorize organic waste of methylene blue.

      Methods. Laterite ore was processed through leaching in chloride solution, followed by filtration and neutralization using sodium hydroxide to obtain a precipitate that contains maghemite photocatalyst. The maghemite was characterized to ensure its capability as a photocatalyst. The decolorization experiment using methylene blue as a representation of organic waste was conducted in the absence and presence of a photocatalyst in a constant UV light to reveal the mechanism of methylene blue decolorization. Hydrogen peroxide and pH are controlled to optimize the photocatalytic efficiency.

      Findings. A photocatalyst made from laterite contributes to the significant increase in the decolorization degree of me-thylene blue through the release of hydroxyl radicals, a powerful substance for decomposing organic matter. The optimal decomposition of methylene blue is achieved by combining the increase of hydrogen peroxide and the reduction of the pH of the organic waste. The optimum pH for the decolorization of methylene blue through photocatalytic reaction is at pH = 3.

      Originality. For the first time, the mechanism of decolorization in the absence and presence of photocatalyst is revealed, resulting an optimum condition to achieved highest degree of methylene blue decolorization.

      Practical implications. The method for synthesizing photocatalysts can be applied to produce alternative products from laterite ore, especially low-grade laterite ore, a by-product of high-grade nickel ore mining. The optimum conditions revealed in this research can be applied to synthesize photocatalysts from laterite ore and to remediate organic wastes.

      Keywords: laterite, maghemite, photocatalyst, decolorization


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