Adsorption of Biebrich Scarlet Dye into Remains Chromium and Vegetable Tanned Leather as Adsorbents

Abstract

Chromium tanned leather wastes (CTLW) and vegetable tanned leather wastes(VTLW) were used as adsorbent materials to remove the Biebrich scarlet dye (BS),as an anionic dye from wastewater, using an adsorption method. The effects ofvarious factors, such as weight of leather waste, time of shaking, and the startingconcentration of Biebrich scarlet dye, temperature and pH were studied. It describedthe adsorption process using Langmuir and Freundlich isotherm models. Theobtained results agreed well with the Langmuir model, and the maximum adsorptioncapacities of CTLW and VTLW were 73.5294 and 78.1250 mg.g⁻¹, respectively,suggesting a monolayer adsorption process. The adsorption kinetic was found tofollow a pseudo-second-order kinetic model with correlation coefficients R2 >0.9982 and 0.9900 for CTLW and VTLW, respectively. The results predicted thatchromium leather wastes were more suitable adsorbents for the removal of BS dyefrom wastewater than vegetable tanned leather wastes, and the adsorption process isendothermic, according to the study of the effect of temperature.