Adsorption of dyes from aqueus solution by chromium-containing leather waste / Zhang Mina in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 6 (11-12/2004)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 6 (11-12/2004) . - p. 236-241 Titre : Adsorption of dyes from aqueus solution by chromium-containing leather waste Type de document : texte imprimé Auteurs : Zhang Mina, Auteur ; Bi Shi, Auteur Année de publication : 2004 Article en page(s) : p. 236-241 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Adsorption Cuir -- Déchets Cuir -- teneur en chrome Solutions aqueuses (chimie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The adsorption behaviours were investigated of chromium-containing leather waste towards Acid Flavine G ( Acid Yellow 11; 18820) and Direct Pink 12B (Direct Red 31; 29100) in aqueous solution. The results indicated that both the acid dye and direct dye could be significantly adsorbed by this novel adsorbent. Acid pH values favor the adsorption and the adsorption capacity decreases with the increase of pH. The experimental data of adsorption isotherms of both the dyes fit well to the Langmuir model rather than the Freundlich model. The greatest amounts adsorbed of Acid Flavine G and Direct Pink 12B, at 293K, were 803.4mg/g and 798.7mg/g, respectively when the initial concentration of dye solution was 2000mg/L. The adsorption capacities of the dyes increased further with rising temperature. As the temperature was increased to 323K, the maximum adsorption amounts of Acid Flavine G and Direct Pink 12B reached 980.4mg/g and 1369mg/g respectively, which indicated that the mechanism of the adsorption might be chemical adsorption. The adsorption kinetics data can be well-described by the pseudo-second-order rate model. The adsorption capacities calculated by the pseudo-second-order rate model were close to those determined by actual measurement (error < 8 %). The column adsorption kinetics studies showed that the breakthrough points of Acid Flavine G and Direct Pink 12B were 30 and 40 bed volumes in the experimental system, which indicated that the adsorption column has a high availability for adsorption of dyes. Desorption studies showed that the Acid Flavine G adsorbed could be completely desorbed by using 0.1mol/L NaHCO3, but complete desorption of Direct Pink 12B was somewhat difficult. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Influence of pH on adsorption - Adsorption isotherm studies - Adsorption kinetics studies - Column adsorption kinetics studies - RESULTS AND DISCUSSION : Proper pH value for adsorption - Adsorption isotherms - Adsorption kinetics - Column adsorption kinetics - Table 1 : Parameters obtained for the Langmuir isotherm model - Table 2 : Parameters obtained for the Freundlich isotherm - Table 3 : Adsorption kinetics parameters of dyes on chromium-containing leather absorbent (initial conc. 500mg/L, pH=3) En ligne : https://drive.google.com/file/d/1N6K4jS_TusSEBSnzKLcyE2-JY2hK2n_7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39616 [article]

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Removal of aromatic organic acids from aqueous solution by using chrome leather waste as an adsorbent / Zhang Mina in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 3 (02/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 3 (02/2008) . - p. 62 - 67 Titre : Removal of aromatic organic acids from aqueous solution by using chrome leather waste as an adsorbent Type de document : texte imprimé Auteurs : Zhang Mina, Auteur ; Xuepin Liao, Auteur ; Jiang Sujie, Auteur ; Bi Shi, Auteur Année de publication : 2008 Article en page(s) : p. 62 - 67 Note générale : Bibliogr. Langues : Américain (ame) Résumé : Chrome leather shavings were used to prepare adsorbent for removal of aromatic organic acids from aqueous solution. Benzoic acid, o-, m-, and p-phthalic acids, salicylic acid and p-hydroxyl benzoic acid, which are common pollutants in waste water, were used as adsorbates in this study to investigate the sorption behavior of the adsorbent made from chrome leather waste. It was found that the sorption capacity of aromatic organic acids on the adsorbent depends largely on the molecular structures of these compounds. The sorption capacity of o-phthalic acid on the adsorbent was as high as 2.8mmol/g in experimental conditions, and that of salicylic acid was around 0.41mmol/g. However, no significant sorption was observed in the case of benzoic acid. Sorption isotherms of aromatic organic acids are typically non-linear ones, and can be well fitted by adsorption-partition model. The contributions of adsorption and partition to total sorption of these compounds on the adsorbent were quantitatively described. It was found that, for o-phthalic acid, the function of partition is predominant, and for p-phthalic acid, adsorption plays a key role. As for m-phthalic acid and salicylic acid, the contributions of adsorption and partition to total sorption depend on the concentration of adsorbate. Those results demonstrate that this adsorbent can be applied to remove aromatic organic acids from wastewaters in a wide range of concentration. En ligne : https://drive.google.com/file/d/1SXS3bEjUrqft0dbxvs1wIkUuJtUFZlMV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2573 [article]

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