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Adsorption of Malachite Green Using Alkali-Modified Fish Scale Bioadsorbents

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  • Dr. Manda Anil Mhatre

    (Department of Zoology 1Changu Kana Thakur Arts, Commerce, and Science College, New Panvel, Raigad district, Maharashtra)

  • Dr. Sapana Chilate

    (Dept. of Chemistry 2M.M.P.A.S.C. College, Panvel. Raigad district, Maharashtra)

Abstract

The removal of toxic Malachite Green (MG) dye from water was studied using low-cost fish-scale biosorbents chemically activated with NaOH and KOH. The fish scales were cleaned, ground and soaked in 0.3 M NaOH or KOH (24 h), then rinsed and oven-dried to produce two adsorbents (FS-NaOH, FS-KOH) Batch experiments examined the effects of solution pH (3-11), adsorbent dose, and temperature (20-40 °C) on MG uptake. Equilibrium data were fitted to Langmuir and Freundlich isotherms. The NaOH-treated scales showed higher adsorption capacity than KOH-treated. Removal efficiency increased with higher pH and larger adsorbent dose, reaching >95% at optimal conditions. The data best fit a Langmuir model (monolayer adsorption), with maximum capacities on the order of 10-20 mg·g⠻¹ (FS-NaOH) and lower for FS-KOH. Kinetic analysis indicated pseudo-second-order behavior. The results demonstrate that alkali-modified fish scales are effective biosorbents for MG, with NaOH activation yielding superior performance.

Suggested Citation

  • Dr. Manda Anil Mhatre & Dr. Sapana Chilate, 2025. "Adsorption of Malachite Green Using Alkali-Modified Fish Scale Bioadsorbents," International Journal of Research and Innovation in Applied Science, International Journal of Research and Innovation in Applied Science (IJRIAS), vol. 10(11), pages 01-08, November.
    • Handle: RePEc:bjf:journl:v:10:y:2025:i:11:p:01-08
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