Removal of Pb(II) and Cd(II) from aqueous solution using alkaline-modified pumice stone powder (PSP): equilibrium, kinetic, and thermodynamic studies

Authors : Vivian JONASI, Kaina MATINA, Upenyu GUYO

Pages : 748-759

View : 15 | Download : 11

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Adsorption processes of Cdinsert ignore into journalissuearticles values(II); and Pbinsert ignore into journalissuearticles values(II); from aqueous solutions onto pumice stone powder insert ignore into journalissuearticles values(PSP); were investigated in batch mode. The influences of solution pH, contact time, adsorbent dosage, initial metal insert ignore into journalissuearticles values(M); concentration, and temperature on adsorption process were investigated. The kinetic and isotherm data were analysed using different model equations. The adsorption process was consistent with the Langmuir model for both metal ions with high R$^{2}$ and low $\chi^{2}$ values for both Pbinsert ignore into journalissuearticles values(II); and Cdinsert ignore into journalissuearticles values(II);. The maximum monolayer adsorption capacities were 28.09 and 27.17 mg g$^{-1}$ for Pbinsert ignore into journalissuearticles values(II); and for Cdinsert ignore into journalissuearticles values(II);, respectively. The pseudo-second order kinetic model explained the kinetic data as evidenced by the calculated q$_{e}$ insert ignore into journalissuearticles values(cal); values insert ignore into journalissuearticles values(10.42 mg g$^{-1}$ for Pbinsert ignore into journalissuearticles values(II); and 2.62 mg g$^{-1}$ for Cdinsert ignore into journalissuearticles values(II);); agreeing with the experimental values insert ignore into journalissuearticles values(9.24 mg g$^{-1}$ for Pbinsert ignore into journalissuearticles values(II); and 2.49 mg g$^{-1}$ for Cdinsert ignore into journalissuearticles values(II););. Consequently, the present study demonstrated that PSP could be utilised in adsorptive removal of Cdinsert ignore into journalissuearticles values(II); and Pbinsert ignore into journalissuearticles values(II); ions from aqueous solutions.
Keywords : Removal, pumice stone powder, Cd II, Pb II, kinetics