| Title | Kiwi peel waste as a recyclable adsorbent to remove textile dyes from water: Direct Blue 78 removal and recovery |
|---|---|
| ID_Doc | 12350 |
| Authors | Gubitosa, J; Rizzi, V; Fini, P; Nuzzo, S; Cosma, P |
| Title | Kiwi peel waste as a recyclable adsorbent to remove textile dyes from water: Direct Blue 78 removal and recovery |
| Year | 2024 |
| Published | Physical Chemistry Chemical Physics, 26.0, 13 |
| Abstract | According to circular bioeconomy principles, the use of kiwi peels to remove Direct Blue 78 (DB) from water is investigated during this work, proposing food waste as a recyclable adsorbent substrate. Direct Blue 78 (DB) was adopted as a model pollutant, employing its visible spectrum to monitor its adsorption. The adsorption process was thus fully characterized, investigating the roles of ionic strength, pH values, adsorbent/pollutant amounts, and temperature. The thermodynamics, kinetics, and adsorption isotherms were also studied. To extend the kiwi peels' lifetime, quite complete desorption was obtained by adopting hot water as a safe and eco-friendly strategy. Despite the relatively low kiwi peels' maximum adsorption capacity (6 mg g-1) for DB when adsorbed in the presence of NaCl, 10 cycles of adsorption/desorption were attempted, proposing the recycling of both the dye and kiwi peels as dictated by circular economy principles. Dyeing experiments were also performed, evidencing the dye's ability to color cotton fabrics after its recycling. Finally, the removal of other textile dyes, Direct Red 83 : 1 and Direct Yellow 86, was demonstrated in a mixture with DB. A preliminary investigation was performed to find the best working conditions for inducing the solid-state dye photodegradation, proposing a possible alternative for the adsorbent regeneration. According to circular bioeconomy principles, the use of kiwi peels to remove Direct Blue 78 (DB) from water is investigated during this work, proposing food waste as a recyclable adsorbent substrate. |
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