Adsorptive removal of safranin (dye) using low cost adsorbent.

Abstract

There is a regular industrial practice of disposing or emitting of chemical dye material to environment in the form of liquid effluent, which is a matter of global concern. Dyes are widely used in several industries like textile, dyeing, paper and pulp, tannery, paint industries etc. Dyes are considered an objectionable type of pollutant because they are toxic in nature and can be detected from bare eyes. Their classification can be done based on their usage, group and solubility. Various treatment processes used for the removal of dyes include adsorption, microbial degradation, wet air oxidation, ion exchange etc. Low cost adsorbents are available option for dyes removal from aqueous effluents. However, high cost of commercial adsorbents like activated carbon and others, material are losses during their usage, but by regeneration pose can be a best utilization of costlier adsorbent. Adsorbent was self-prepared in laboratory from blackberry seed, which is raw biomass. The adsorbent was characterized for BET surface area, point of zero charge, CHNS, TGA, SEM, FTIR etc. Safranin basic dye, removal from the wastewater using activated blackberry adsorbent (ABC) which was self-prepared. Here batch studies were conducted to evaluate the effect of adsorbent dose, contact time, pH, initial concentration at 25 0C.The equilibrium adsorption data of Safranin (dye) on adsorbent were analysed by the Langmuir, Freundlich and Temkin isotherm models. The isotherm data were well described by the Langmuir isotherm model. Pseudo-first-order, pseudo-second-order models were used to analyze the kinetic data obtained at different concentrations. The adsorption kinetics was well described by the pseudo-second-order kinetic model. For Safranin-ABC system maximum adsorption capacity were found to 39.683 mg/g at 250C.Adsorption experiment has carried out to show that maximum adsorption and it observed in acidic medium for ABC.