Removal of Brilliant Red from Aqueous Solutions by Adsorption on Fish Scales

Abstract

Removal of brilliant red (C. I. Reactive Red 2) from aqueous solutions by adsorption on fish scales of Labeo rohita was investigated. Batch adsorption experiments were carried out under different experimental conditions such as contact time, initial concentration of dye solutions, temperature and pH of the solution. The optimum pH for the adsorption experiment was found to be 7.2. The equilibrium time for the adsorption of brilliant red (BR) on fish scales was estimated and found to be three hours. The amount of brilliant red adsorbed on fish scale surface decreased with increasing pH and temperature of the solution. The negative value of differential heat of adsorption suggests that the adsorption process is exothermic. Langmuir adsorption isotherm was found to fit the experimental data better than that of the Freundlich adsorption isotherm.

Removal of Acid Dyes from Textile Wastewaters Using Fish Scales by Absorption Process

“…FS size and the length of contact time had significant effect on the dye removal performance. Performance increased drastically with the increase of FS size (75, 149, 250, 425 µ and larger, as well as pristine whole scales) ( Figure 6A), which contradicted the findings for the adsorption process [7,10,16,21]. This disparity in the finding might be explained from the FT-IR spectra, which show the organic content of FS responsible for absorption is reduced while pulverized; however, it outlines future research to reveal the underlying reason behind depletion of organic content.…”

“…Additionally, these colored scales can be used for beautification purpose, such as designing furniture, upholstery and apparel [36]. [7,10,16,21]. This disparity in the finding might be explained from the FT-IR spectra, which show the organic content of FS responsible for absorption is reduced while pulverized; however, it outlines future research to reveal the underlying reason behind depletion of organic content.…”

“…This suggests that the addition of salt and/or acid or their combination might engage some dye binding sites of FS resulting in an inferior performance. The pH of acidic wastewaters (pH = 2.33 for AB45, and pH = 2.5 for AR1 and AY127) in the absence of salt promoted the dye up-take, by making FS more positively charged, which draws the negatively charged sulfonate (-SO 3 − ) groups of dyes and vice versa [7,21]. On the other hand, the salt in the absence of the acid negatively affected the process performance implying that probably salt is the one parameter which might involve some dye binding sites.…”

Assessment of fish scale biosorbent in the treatment of seafood processing plant wastewater

“…The use of waste for the production of an adsorbent material may reduce the amount of waste to be disposed of and reduce costs from the requirement of using expensive and high‐purity synthetic reagents 7 . Use of biosorbents such as baggase, banana pith, water hyacinth root, sawdust, leaf powder, chitin and chitosan have been found to be highly effective, cheap and ecofriendly for removal of organic pollutants from wastewater 8 . The utilization of fish scales as biosorbent in the treatment of wastewaters is a recent innovation.…”

“…7 Use of biosorbents such as baggase, banana pith, water hyacinth root, sawdust, leaf powder, chitin and chitosan have been found to be highly effective, cheap and ecofriendly for removal of organic pollutants from wastewater. 8 The utilization of fish scales as biosorbent in the treatment of wastewaters is a recent innovation. Fish scales contain 40-90% organic protein matter including type-I collagen composed of a high amount of proline, glycine, alanine, hydroxylysine and hydroxyproline, and 10-60% inorganic mineral, calcium-deficient hydroxyapatite composed of sodium, magnesium and carbonates attached to phosphate of the hydroxyapatite ions, regardless of the type of fish.…”