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

Abstract

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.

Green Microalgae Scenedesmus Obliquus Utilization for the Adsorptive Removal of Nonsteroidal Anti-Inflammatory Drugs (NSAIDs) from Water Samples

“…The images of scanning electron microscopy with energy dispersive spectroscopy were obtained using a high-resolution scanning electron microscope with X-Ray microanalysis (JEOL JSM 6301F/ Oxford INCA Energy 350) [60]. Samples were coated with an Au/Pd thin film, by sputtering, using the SPI Module Sputter Coater equipment, for 100 s with a 15-mA current.…”

Color Removal in Textile Wastewaters using Natural Adsorbents as a Sustainable way of Treatment

“…Its adsorption capacity was significantly increased by thermal treatment, which allows also the regeneration of the spent adsorbent. Adsorption of dyes onto feathers of gallinaceous was extensively studied by Figueiredo & Freitas [9] and Freitas, et al [10] that investigated adsorption kinetics and equilibrium of the adsorption and Sousa, et al [11] extended this search to adsorption experiments in fixed-bed column. Eucalyptus bark (from Eucalyptus globulus) has demonstrated also relatively good potential for color removal [12].…”