Pb (II) Recovery by Trout Bones: Adsorption, Desorption and Kinetic Study

Abstract

Heavy metal removal from the water was studied by using fish bones produced in the trout farm of Atatürk University Faculty of Fisheries. Fish bones used as adsorbent were obtained from rainbow type trout (Oncorhynchus Mykiss). Trout bone was used in its natural form. According to the experimental results that 1 g of Rainbow trout bones (RTB) can adsorb 188.16 mg of lead (qmax). Langmuir and Freundlich isotherm models were found more favourable for the adsorption of Pb (II) on to RTB than Temkin with the correlation coefficients of 0.999, 0.999 and 0.857, respectively. The optimum working parameter values for Pb (II) adsorption using RTB were found to be 30oC, 3 g/L, 200 rpm and 10 mg/L for temperature, adsorbent concentration, stirring speed and initial Pb (II) concentration, respectively. In the kinetic phase of the study, pseudo-second-order kinetic model gives more favourable results (R2mean= 0.997) than pseudo-second-order (R2mean= 0.971). Fish bones were characterized by some instrumental analyses such as SEM, EDS, FTIR and zeta potential measurements. In the regeneration phase of the study, maximum desorption efficiency was 95.86% at pH 1.5.