Decolorization of Crystal Violet Dye in an Aqueous Solution Using Peanut Hull Powder as an Eco-friendly Adsorbent

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 (۲-۱۰), contact time (۱۰-۹۰ min), temperature (۱۵-۴۰ °C), adsorbent dose (۰.۵-۳ g), and adsorbent particle size (۱۵۰-۱۱۸۰ µm). Depending on the point of zero charge (pHpzc), the optimum value of pH for the solution was above ۴.۶. The best parameters for removing CV dye using PHP were pH = ۶, temperature of ۲۵ °C, adsorbent dose of ۱.۵ g, and particle size of ۱۵۰ µm. The highest removal percentage was ۹۵% at a CV concentration of ۲۰ mg/L. The study found that PHP is a viable and inexpensive adsorbent for adsorptive elimination of CV from colored wastewater.