Biosorption of Chromium and Lead from Electroplating Industry Effluent Using Modified Cane Bagasse: Fid-Bau Portal

Biosorption of Chromium and Lead from Electroplating Industry Effluent Using Modified Cane Bagasse

Pagala, Bangaraiah

The biosorption capacity of cane bagasse for the discharge of chromium and lead from the Electroplating industry effluent was investigated. The batch biosorption method was applied to get the optimum initial ion concentration, dosage, agitation time, and pH for the adsorption of Cr and Pb metals. The maximum percentage removal of chromium was obtained with the optimum conditions of initial metal ion concentration—5 mg/l, dosage—0.5 g, agitation time − 40 min. and pH—5. Similarly, for lead, the optimum conditions were initial metal ion concentration—5 mg/l, dosage—0.6 g, agitation time − 50 min. and pH—6. The temperature effect on biosorption was carried out and found to be 30 °C. The experimental data were validated with the Freundlich and Langmuir isotherms. It was observed that the Langmuir model was well-suited compared to the Freundlich model. The kinetics for the biosorption of chromium and lead was assessed using first-order and second-order models. The correlation coefficient (R²) value for chromium and lead was 0.955 and 0.974, respectively, for first-order kinetics but for second order the correlation coefficient of chromium and lead was 0.993 and 0.989 obtained, respectively, and concluded that the given data were well explained by second-order kinetics compared to first order. The thermodynamic parameters ∆G°, ∆H°, and ∆S° were also examined and found that a positive value of ∆H°, indicated biosorption was endothermic and a negative value of the free energy (∆G°) stated that spontaneous nature of the biosorption. The biosorbent characteristics were also analyzed using SEM and FTIR analysis. The maximum biosorption of chromium and lead was found to be 97.12% and 98.8%, respectively. A desorption study was also conducted and found 95.2% of absorbed metals were removed from the sorbent. From these findings, it was concluded that chemically modified cane bagasse is a potential biosorbent for chromium and lead biosorption from the Electroplating industry wastewater.