Abstract

In recent years the development of chitosan (CH) based materials as useful adsorbent polymericmatrices is an expanding field in the area of adsorption science. Even though CH has been successfullyused for dye removal from aqueous solutions due to its low cost, no considerations havebeen made about, for example, the effect of changing the pH of chitosan hydrogelor about the dehydratingeffect of Ethanol (EtOH) treatment of chitosan film on the dyes removal from water.Consequently in our laboratory we carried out a study focusing the attention, mainly, on the potentialuse of CH films under different conditions, such as reducing the intrinsic pH, increasing thehydrophobic character by means of ethanol treatment and neutralization of CH films to improvetheir absorption power. Textile anionic dyes named Direct Red 83:1, Direct Yellow 86 and Direct Blue 78 have been studied with the aim of reducing the contact time of CH film in waste water improvingthe bleaching efficiency. Neutralized acid CH film and longtime dehydrated one result tobe the better films in dye removal from water. Also the reduction of the CH solution acidity duringthe film preparation determines the decreasing of the contact time improving the results. The effectof initial dye concentration has been examined and the amount of dye adsorption in functionof time t, qt (mg/cm2), for each analyzed film has been evaluated comparing the long term effectwith the decoloration rate. A linear form of pseudo-first-order Lagergren model has been used anddescribed. The best condition for removing all examined dyes from various dye solutions appearsto be the dehydration of a novel projected CH film obtained by means of the film immersion inEtOH for 4 days. Also CH films prepared by well-known literature procedure and neutralized withNaOH treatment appear having an excellent behavior, however the film treatment requires a largequantity of water and time.

Autore Pugliese

• Fini Paola

Tutti gli autori

• V. Rizzi; A. Longo; T. Placido; P. Fini; J. Gubitosa; T. Sibillano; C. Giannini; P. Semeraro; E. Franco; M. Ferrandiz; P. Cosma

Titolo volume/Rivista

Advances in chemical engineering and science

Anno di pubblicazione

2014

ISSN

2160-0406

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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