The removal of color from effluents using polyamide–epichlorohydrin‐cellulose polymer. III. Use in anionic dye removal in a batch process

Hwang, Mi-Lim; Chen, K. M.

doi:10.1002/app.1993.070500420

Cited by 16 publications

(6 citation statements)

References 5 publications

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“…Several researchers have studied the adsorption of aqueous solutions of AO7 at different pH (see Table 5), demonstrating the fact that removal of AO7 is much higher in very acidic medium [40,43,45,47,57,60,69], although this pH is not reliable in wastewater. The plausible mechanisms mentioned by those authors include ion-dipole forces, anion exchange, hydrogen bonding and non-specific interactions.…”

Section: Adsorption Of Acid Orange 7 Employing Guava Seed Carbonmentioning

confidence: 99%

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Removal of acid orange 7 by guava seed carbon: A four parameter optimization study

Elizalde-González

Hernández‐Montoya

2009

Journal of Hazardous Materials

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Section: Adsorption Of Acid Orange 7 Employing Guava Seed Carbonmentioning

confidence: 99%

“…A pioneer work on the removal of AO7 was performed with a polymer [43]; further mostly chitin/chitosan biopolymers have been tested [44][45][46][47] and the dye molecule has served as probe compound to test the porosity of a phtalocyanine polymer [48], carbon fiber [49] and activated carbons [50,51].…”

Section: Introductionmentioning

confidence: 99%

Removal of acid orange 7 by guava seed carbon: A four parameter optimization study

Elizalde-González

Hernández‐Montoya

2009

Journal of Hazardous Materials

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“…These results are similar to those obtained by Mckay et al . and by Hwang and Chen , 6.2 and 25.6 kJ mol −1 . As shown in Figure b, a logarithmic relationship between the adsorption heat and the adsorbed amount in equilibrium was observed, which is in agreement with the fact that the Freundlich model fitted the experimental data well.…”

Section: Resultsmentioning

confidence: 88%

Adsorption equilibrium studies of a simulated textile effluent containing a wool reactive dye on gallinaceous feathers

Freitas

Moura

Figueiredo

et al. 2016

Coloration Technology

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Gallinaceous feathers (from Gallus gallus domesticus, strains Cobb 500 and Label) were used as adsorbent for colour removal from a simulated textile effluent containing a wool reactive dye, the Yellow Lanasol 4G (CI Reactive Yellow 39). A brief chemical and physical characterisation of feathers was performed. Equilibrium studies at different selected temperatures, in the range 10–60 °C, were carried out. The equilibrium data were analysed using the Freundlich and Langmuir isotherm models. Adsorption capacity strongly increases with temperature. A maximum adsorption capacity of around 300 mg g−1 was obtained for Gallus gallus feathers, strain Cobb 500, at 60 °C, while for strain Label, 200 mg g−1 was obtained at 50 °C. For each type of feather a generalised model, valid for a given temperature range, was obtained. The isosteric heat of adsorption calculated was positive, so the mechanism involved in the adsorption process should correspond to endothermic chemisorption. This study provides important information concerning the use of gallinaceous feathers without any chemical treatment for colour removal from real textile wastewaters. The results in this study indicated that gallinaceous feathers, when compared with activated carbon, open promising perspectives concerning their utilisation for colour removal from textile effluent discharged at high temperatures; moreover, it would be an alternative for the valorisation of this waste.

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“…11 Chemical modification of the sunflower stalks did not vary their temperature preference of the dye adsorption, but the impact was different at both tested temperatures. As a result, we think that the adsorption processes of anionic dyes on sunflower stalks are endothermic, while that of cationic ones are exothermic, though the temperature effect is minimal.…”

Section: Langmuir Isothermsmentioning

confidence: 97%

Chemically modified sunflower stalks as adsorbents for color removal from textile wastewater

Shi

Sun

1999

J. Appl. Polym. Sci.

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Quaternary ammonium groups were chemically grafted onto sunflower stalks in order to improve their adsorption performance to anionic species in wastewater. The chemically modified sunflower stalks were evaluated as adsorbents for two basic dyes (Methylene Blue and Basic Red 9) and two direct dyes (Congo Red and Direct Blue 71) in aqueous solutions by using equilibrium isotherms and kinetic adsorption. Before the modification, sunflower stalks exhibited relatively low adsorption to the direct dyes but very high adsorption to the basic dyes. The modified sunflower stalks showed increased adsorption to the anionic dyes, but slightly reduced adsorption to the cationic dyes, due to the existence of quaternary ammonium ions on the surface of the residues. The maximum adsorption capacities of two direct dyes on the modified sunflower stalks are 191.0 and 216.0 mg g for Congo Red and Direct Blue 71 at 50°C, respectively, which were at least four times higher than that of the unmodified residues. The adsorption rates of two direct dyestuffs are much higher on the modified residues than on the unmodified ones. Within 30 min, about 80% of direct dyes were removed from the solutions by the residues.

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The removal of color from effluents using polyamide–epichlorohydrin‐cellulose polymer. III. Use in anionic dye removal in a batch process

Cited by 16 publications

References 5 publications

Removal of acid orange 7 by guava seed carbon: A four parameter optimization study

Removal of acid orange 7 by guava seed carbon: A four parameter optimization study

Adsorption equilibrium studies of a simulated textile effluent containing a wool reactive dye on gallinaceous feathers

Chemically modified sunflower stalks as adsorbents for color removal from textile wastewater

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