Peanut shells turned magnetic sponges soak up textile dye pollution
Din SZU, Ahmed IA, Xie J, Hayat A, Mahmoud ERI
Phytoremediation
The peanut shells you'd normally toss in the compost or trash can be turned into a cheap, magnet-retrievable filter that pulls toxic dye out of contaminated water, showing how garden and food waste can double as pollution cleanup tools.
Researchers took peanut shells, a common food waste, and turned them into charcoal-like material called biochar. They then added tiny magnetic particles and a coating made from chitosan (a substance from crab and shrimp shells) to create a material that grabs onto a harmful red dye used in textiles and pulls it out of water. Because the material is magnetic, it can simply be lifted out with a magnet, cleaned, and used again, making it a practical and affordable way to treat polluted wastewater.
Key Findings
The chitosan-magnetic biochar composite (CS-MPSB) removed up to 307 mg of Congo red dye per gram of material, compared to 259 mg/g for plain peanut shell biochar and 282 mg/g for the magnetic version alone
The material has a high surface area of 248.9 m2/g with tiny mesopores (3.76-3.77 nm wide), and dye removal worked best at a mildly acidic pH of 5.0
The composite showed strong reusability and tolerated salty water conditions, and its maximum dye-holding capacity (322.6 mg/g) improved at higher temperatures, indicating an energy-favorable reaction
chevron_right Technical Summary
Scientists turned leftover peanut shells into a magnetic, chitosan-coated sponge-like material that soaks up Congo red dye from water, pulling out over 300 mg of dye per gram and letting the material be scooped out with a magnet for reuse.
Abstract Preview
Original paper
Chitosan-functionalized magnetic peanut shell biochar composite for efficient adsorptive removal of Congo red from aqueous solution.
Synthetic dye discharge into aquatic systems has become an escalating environmental concern because these colorants are chemically recalcitrant, toxic, and resistant to biodegradation. In the prese...
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