Urea removal from agricultural waste waters by means of urease immobilized on nylon membranes grafted with cyclohexyl-methacrylate (Articolo in rivista)

Type
Label
  • Urea removal from agricultural waste waters by means of urease immobilized on nylon membranes grafted with cyclohexyl-methacrylate (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • Di Martino S, H. El-Sherif, Diano N, De Maio A, Grano V, S. Rossi, U. Bencivenga, A. Mattei, Mita DG (2003)
    Urea removal from agricultural waste waters by means of urease immobilized on nylon membranes grafted with cyclohexyl-methacrylate
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Di Martino S, H. El-Sherif, Diano N, De Maio A, Grano V, S. Rossi, U. Bencivenga, A. Mattei, Mita DG (literal)
Pagina inizio
  • 613 (literal)
Pagina fine
  • 629 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 46 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Nell'articolo viene descritto sia il metodo di preparazione di una mebrana catalitica supportante l'enzima ureasi sia il suo impiego in prototipi di bioreattori capaci di abbattere la quantità di urea presente nelle acque reflue da agricoltura. (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1) Istituto di genetica e Biofisica \"ABT\" - CNR 2) Seconda Università degli Studi di Napoli (literal)
Titolo
  • Urea removal from agricultural waste waters by means of urease immobilized on nylon membranes grafted with cyclohexyl-methacrylate (literal)
Abstract
  • In view of the treatment of agricultural waste waters, urea polluted, a catalytic and hydrophobic membrane was constructed by immobilizing urease on a nylon sheet grafted with cyclohexyl methacrylate. Hexamethylenediamine and glutaraldehyde were used as spacer and crosslinking agent, respectively. With reference to the soluble counterpart immobilized urease was found to exhibit i) a shift of the optimum pH towards more acidic values; ii) a shift of the optimum temperature towards higher temperatures; iii) higher values of Km. The latter result indicated an apparent loss of affinity of immobilized urease towards urea. To recovery this affinity loss, the catalytic membranes were employed in a bioreactor operating under non-isothermal conditions. Under these conditions the catalytic membranes exhibited reaction rates higher and apparent Km smaller than those measured under comparable isothermal conditions. As a consequence, percentage increases of enzyme activity and reduction of the production times, proportional to the magnitude of the applied temperature difference were observed. Results have been discussed in the frame of reference of the process of thermodialysis. The technology of the non-isothermal bioreactors confirmed its usefulness also in the reduction of urea concentration in aqueous solutions. (literal)
Prodotto di
Autore CNR
Insieme di parole chiave

Incoming links:


Autore CNR di
Prodotto
Insieme di parole chiave di
data.CNR.it