Adsorption of Naphtol Blue Black (NBB) Dye over Immobilized Chitosan from Shrimp Shells onto Glass Plate

Abstract

The adsorption of naphtol blue black (NBB) dye using immobilized chitosan on the glass plates had been investigated. The chitosan is derived from chitin deacetylation shrimp shells waste with the degree of deacetylation of chitosan is 75.7%. The produced chitosan were analyzed using FTIR and SEM. The effects of different reaction parameters such as mass of adsorbent, initial pH of solution and initial dye concentration were studied for the adsorption NBB dye. The results from this research showed that 30 mg of adsorbent mass at initial pH 6.0 yielded the optimum conditions for the adsorption of 30 mg/L NBB dye solution at the immobilized chitosan interface with the percentage removal of the dye is 97.187%. The equilibrium adsorption data of this research were analyzed by Langmuir and Freundlich isotherm models. The maximum adsorption capacity is obtained by using Freundlich isotherm with a correlation coefficient (R2) for 0,989 is greater than the value (R2) 0.968 of Langmuir isotherm which the nF and Kf values were 3.56 and 41.78 L/g respectively. The maximum adsorption capacity (qmax) calculated from the Langmuir model is found to be 45,45 mg/g. The kinetics of the NBB dye adsorption nicely followed the pseudo-first rate which demonstrates that physisorption is the possible rate-limiting step controlling the adsorption process in this research.