Synthesis of Graphene Oxide Based Sodium Alginate Nanocomposites and their Application in Removal of Cr (VI) Ions from Coal Effluents

Abstract

Prabha Raj and Rohit Kumar Bargah

In the present study, graphene oxide-based sodium alginate nanocomposites have been used as an efficient low cast adsorbent to remove the concentration of toxic Cr (VI) ions from coal effluent. graphene oxide is prepared from sugarcane -bagasse and reacted with sodium- alginate and calcium-chloride to form the Na-Alg-Go composite. The developed composite was character- ized by FTIR, XRD, TEM, particle size and zeta potential measurements. The adsorption experiments were carried out by batch contact method and the effect of the significant process parameter such as initial pH of solution, adsorbent dose, contact time and the initial Cr (VI) concentration were investigated on the metal ion removal capacity. The optimum adsorption of Cr (VI) on the Na- Alg-Go nanoparticles was observed at an initial pH value of 2.4±0.4. The maximum sorption capacity of Cr (VI) in coal effluent was found to be in between 100- 110 mg/g in comparison with std initial chromium (VI) solution in the range of 40-200 ppm at room temperature. The equilibrium sorption data fit satisfactorily to the Langmuir adsorption and Freundlich adsorption isotherm. The results suggest that adsorption is due to electrostatic attraction between chromate ions (HCrO - ) and protonated surface of Na-Alg-Go composite and these has been efficaciously ecofriendly and economically applied for the removal of metal ion Cr( VI) and pollution from coal field effluent (Figure.1).

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