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Rimozione di ioni cromo trivalente mediante adsorbimento su idrogel

Rimozione di ioni cromo trivalente mediante adsorbimento su idrogel


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About the Book

Lo scopo di questo lavoro è stato quello di studiare le prestazioni di un idrogel preparato gonfiando un polimero a base di poliacrilato di sodio in un eccesso di acqua distillata per la rimozione dell'inquinante inorganico cromo (III) in soluzione acquosa sintetica. La caratterizzazione fisico-chimica dell'adsorbente mediante IR, XRD, SEM ed EDAX ha mostrato che il gel di PANa è un materiale amorfo e poroso ricco di gruppi carbossilati. L'esperimento di rigonfiamento del PANa in acqua ha mostrato che l'idrogel ha un tasso di rigonfiamento abbastanza elevato. Gli esperimenti di adsorbimento hanno mostrato che una buona resa di estrazione del Cr(III) è stata ottenuta dopo 120 minuti di agitazione della soluzione metallica in un intervallo di pH compreso tra 4,5 e 6, per una concentrazione di 20 ppm a temperatura ambiente (25 ± 2°C). La capacità massima di adsorbimento è di circa 108 mg di Cr per g di PANa. La purificazione totale della soluzione inquinata si ottiene con una quantità molto piccola di polimero secco. Lo studio termodinamico ha mostrato che il processo di ritenzione dei cationi metallici è spontaneo ed endotermico. Le buone prestazioni di adsorbimento possono essere attribuite allo scambio ionico dei gruppi carbossilati.


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Product Details
  • ISBN-13: 9786207437252
  • Publisher: KS Omniscriptum Publishing
  • Binding: Paperback
  • Language: Italian
  • Returnable: N
  • Weight: 136 gr
  • ISBN-10: 620743725X
  • Publisher Date: 26 Apr 2024
  • Height: 229 mm
  • No of Pages: 84
  • Spine Width: 5 mm
  • Width: 152 mm


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