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Applicative Study(Part I):The Excellent Conditions to Remove in Batch Direct Textile Dyes(Direct Red,Direct Blue and Direct Yellow)from Aqueous Solutions by Adsorption Processes on Low-Cost Chitosan Films under Different Conditions

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Advances in Chemical Engineering and Science 2014年第4期4卷 454-469页

作者： Vito Rizzi Alessandra Longo paola fini paola Semeraro Pinalysa Cosma Esther Franco Rocío García Marcela Ferrándiz Estrella Núnez JoséAntonio Gabaldón Isabel Fortea Enrique Pérez Miguel Ferrándiz Universitàdegli Studi“Aldo Moro”di Bari Dip.ChimicaBariItaly Consiglio Nazionale delle Ricerche CNR-IPCF UOS BariBariItaly Biotechnology Department Textile Industry Research Association(AITEX)AlcoySpain Departamento Ciencia y Tecnología de Alimentos Universidad Católica San Antonio de MurciaGuadalupeMurciaSpain Colorprint Fashion SLAvda.Fco.Vitoria LaportaMuro de Alcoy(Alicante)Spain

In recent years the development of chitosan (CH) based materials as useful adsorbent polymeric matrices is an expanding field in the area of adsorption science. Even though CH has been successfully used for dye removal from aqueous solutions due to its low cost, no considerations have been made about, for example, the effect of changing the pH of chitosan hydrogelor about the dehydrating effect 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 potential use of CH films under different conditions, such as reducing the intrinsic pH, increasing the hydrophobic character by means of ethanol treatment and neutralization of CH films to improve their 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 improving the bleaching efficiency. Neutralized acid CH film and longtime dehydrated one result to be the better films in dye removal from water. Also the reduction of the CH solution acidity during the film preparation determines the decreasing of the contact time improving the results. The effect of initial dye concentration has been examined and the amount of dye adsorption in function of time t, qt (mg/cm2), for each analyzed film has been evaluated comparing the long term effect with the decoloration rate. A linear form of pseudo-first-order Lagergren model has been used and described. The best condition for removing all examined dyes from various dye solutions appears to be the dehydration of a novel projected CH film obtained by means of the film immersion in EtOH for 4 days. Also CH films prepared by well-known literature procedure and neutralized with NaOH treatment appear having an excellent behavior, however the film treatment requires a large quantity of water and time.

关键词： Chitosan Film Textile Dyes Adsorption Processes Wastewater

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Gelatin-Modified Biomimetic Apatite Coatings

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Journal of Biomaterials and Nanobiotechnology 2012年第2期3卷 154-162页

作者： Barbara Bracci paola Torricelli Silvia Panzavolta Katia Rubini Milena fini Adriana Bigi Department of Chemistry “G. Ciamician” University of Bologna Bologna Italy Preclinical and Surgical Studies Laboratory Re- search Institute Codivilla Putti—Rizzoli Orthopaedic Institute Bologna Italy

Biomimetic coatings constituted of gelatin and nanocrystalline apatite were deposited on titanium substrates from a slightly supersaturated calcium phosphate (CaP) solution enriched with different amounts of gelatin. Although the biopolymer inhibits the crystallization of the inorganic phase, as shown by the reduction of the mean dimensions of the spherical aggregates and of the degree of crystallinity of the apatitic phase on increasing gelatin concentration, the deposition of a uniform layer of nanocrystalline apatite takes place in a few hours. Gelatin incorporation into the precipitate increases on increasing its concentration in solution, up to about 20 wt%. Osteoblast-like MG63 cells cultured on the coatings display good proliferation and increased values of the differentiation parameters with respect to the control. The presence of gelatin improves significantly the biological response to the biomimetic coatings, as shown by the higher values of proliferation, collagen type I and osteocalcin production, as well as alkaline phosphatase activity stimulation.

关键词： Biomimetic Coating Gelatin Hydroxyapatite

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Effect of acoustic field on C02 desorption in a fluidized bed of fine activated carbon

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Particuology 2015年第6期13卷 8-15页

作者： Federica Raganati paola Ammendola Riccardo Chirone Department of Chemical Engineering Materials and Industrial Production University of Naples Federico II P. le V. Tecchio 80 80125 Napoli Italy Istituto di Ricerche sulla Combustione CNR P. le K Tecchio 80 80125 Napoli Italy

Adsorption using solid sorbents has the potential to complement or replace current absorption technol- ogy, because of its low energy requirements. Among the commercially available adsorbent materials, attention is focused on activated carbons because they are easily regenerable by reason of their low heat of adsorption. These sorbents are generally available in the form of fine powders. Sound-assisted fluidization can process large amounts of fine powders, promoting and enhancing CO2 capture on fine sorbents, because it maximizes gas-solid contact. Temperature swing adsorption （TSA）, consisting of inducing sor- bent regeneration and CO2 recovery by appropriate temperature increase and gas purge, is one of the most promising techniques. This study investigates the CO2 desorption process by TSA in a sound-assisted flu- idized bed of fine activated carbon. Desorption tests were performed under ordinary and sound-assisted fluidization conditions to assess the capability of sound to promote and enhance the desorption efficiency in terms of CO2 recovery, CO2 purity, and desorption time. The results show that the application of sound results in higher desorption rates, CO2 recovery and purity. Regular and stable desorption profiles can be obtained under sound-assisted fluidization conditions. This stability makes it possible to successfully realize a cyclic adsorption/desorption process.

关键词： Temperature swing adsorption Sound-assisted fluidization CO2 capture Activated carbons Fine powders

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