Competitive Adsorption of Anionic Dyes from Aqueous Single and Binary Solutions with CoAl Layered Double Hydroxide

Authors : İme AKANYETİ, Jamilu ABDULLAHİ

Pages : 65-76

View : 40 | Download : 31

Publication Date : 2023-09-30

Article Type : Research Paper

Abstract :Layered double hydroxides insert ignore into journalissuearticles values(LDH); have previously been extensively studied as high capacity adsorbents for the removal of dyes from water. However, a comprehensive understanding of why one dye is adsorbed more than another still remains unknown. In addition, a very little is known about how adsorption mechanisms scale when more than one dye is present in the solution. The adsorption capacity of cobalt-aluminum insert ignore into journalissuearticles values(CoAl); LDH was investigated for methyl orange insert ignore into journalissuearticles values(MO);, remazol brilliant blue insert ignore into journalissuearticles values(RBBR); and allura red insert ignore into journalissuearticles values(AR);, at different dye concentrations. The maximum mass of dye adsorbed was obtained for MO insert ignore into journalissuearticles values(2.267 mmol/g);, followed by RBBR insert ignore into journalissuearticles values(0.258 mmol/g); and AR insert ignore into journalissuearticles values(0.195 mmol/g);. X-Ray Diffraction and Fourier transform infrared analysis results demonstrated that surface adsorption and electrostatic interactions contributed to the adsorption while intercalation did not. In a binary solution of MO and RBBR, the highest mass of MO adsorbed was reduced to 1.521 mmol/g while the maximum RBBR mass adsorbed increased to 0.268 mmol/g. CoAl LDH had a preferential adsorption for RBBR within concentrations up to 0.026 mmol/L while MO was preferred at higher concentrations. Overall, the findings suggest that the adsorption capacity of an LDH is highly dependent on the number, characteristics and the equilibrium concentrations of dyes present in a solution.
Keywords : Layered double hydroxide, Adsorption, Methyl orange, Remazol brilliant blue, Binary solution