Hamadan University of Medical Sciences Avicenna Journal of Environmental Health Engineering 2423-4583 11 2 2024 12 29 Decolorization of Crystal Violet Dye in an Aqueous Solution Using Peanut Hull Powder as an Eco-friendly Adsorbent 63 69 10.34172/ajehe.5492 EN Ban H. Mshhain https://orcid.org/0009-0002-6252-5390 Haneen A. Kh. Karaghool https://orcid.org/0000-0001-5104-1003 Nizar N. Ismaeal Journal Article 10.34172/ajehe.5492 2024 05 06 2024 08 11 Environmental issues arising from industrialization and urbanization have grown in frequency and complexity in recent decades. The textile sector is the largest user and generator of dye-laden wastewater, despite its widespread use in several industries. The study explored the adsorption of crystal violet (CV) dye, which is typically found in textile wastewaters, onto peanut hull powder (PHP). Batch tests were done depending on the initial solution pH (2-10), contact time (10-90 min), temperature (15-40 °C), adsorbent dose (0.5-3 g), and adsorbent particle size (150-1180 µm). Depending on the point of zero charge (pHpzc), the optimum value of pH for the solution was above 4.6. The best parameters for removing CV dye using PHP were pH = 6, temperature of 25 °C, adsorbent dose of 1.5 g, and particle size of 150 µm. The highest removal percentage was 95% at a CV concentration of 20 mg/L. The study found that PHP is a viable and inexpensive adsorbent for adsorptive elimination of CV from colored wastewater.