Amalgamation and application of nano chitosan cross-linked with fish scales based activated carbon as an adsorbent for the removal of reactive dye (RB9).

The extensive discomfort in the expulsion of toxic pollutants even at mild concentrations has demanded the need for prompt methods for the evacuation of dyes and heavy metals. The effective method for depuration of dye from the effluent is by sorption. Chitosan is a bio-polymer which is gaining an increasing interest as one of the sorbents. It was obtained from the crab shells by undergoing several chemical processes and used as an adsorbent for dye, metal removal and also for pharmaceutical purposes. Cross linking it with other co polymers will increase the capacity of adsorption to a maximum level. Fish scales are considered to be a major waste in the food industry and since it takes a long time for decomposing it is considered to be one of the pollutants. Hence it is utilised by converting it into activated carbon by preliminary treatment and into a muffle furnace. The obtained activated carbon is combined with chitosan by using a cross linker and utilised for adsorption mechanism. To analyse the effect of chitosan cross linked with activated carbon obtained from fish scales in adsorption of dye Reactive Blue 9 (RB9) to evaluate the adsorption studies, kinetics, mass transfer studies, thermodynamics of the bio adsorbent.

Adsorption of Amaranth Dye from Aqueous Solution Using Environmental Friendly Biosorbents-eggshell Powder.

BACKGROUND AND OBJECTIVE: Dyes and pigments have been used in many industries for coloration purpose but they pose hazards to environment and end users of water. Therefore, it is important to remove these pollutants from wastewater before their final disposal. This work aimed to investigate the removal of amaranth dye by cost effective, eco-friendly, highly efficient adsorbents such as egg shell powder and environmental friendly biosorbent. MATERIALS AND METHODS: The adsorption of anionic amaranth dye by egg shell powder was carried out by varying different parameters which include contact time, pH, adsorbent dosage and temperature to study their potential in adsorption of adsorbent. RESULTS: The results obtained that optimal adsorption of dye was noticed at pH 4 (98.32%), temperature 60°C (96.30%) with 6 g of egg shell powder (97.61%) and has saturation point at 300 ppm after which desorption of dye occurs. The adsorption process was analyzed by the Langmuir, Freundlich and Temkin isotherm models. The adsorption of amaranth was best represented by Freundlich model. CONCLUSION: Egg shell powder is eco friendly bio adsorbent and it can be used for amaranth dye removal.