International Journal of Hydrogen Energy, Vol.45, No.38, 20106-20119, 2020
Simultaneous removal of Cd(II) and phenol pollutions through magnetic graphene oxide nanocomposites coated polyaniline using low temperature plasma technique
Herein, polyaniline functionalized magnetic graphene oxide composites (PANI-g-MGOs) are successfully prepared through adopting low temperature plasma induced technique. The synthesized PANI-g-MGOs composites having excellent saturation magnetization and physicochemical stabilization can be separated using external magnet and removed simultaneously cadmium ion and phenol contaminants. The underlying interaction mechanisms of PANI-g-MGOs towards cadmium ion and phenol are conducted under coexistence experimental conditions. The adsorption kinetics processes and isotherms performances of cadmium ion and phenol onto PANI-g-MGOs composites can be remarkably imitated with pseudo-second-order kinetic model and Langmuir model, respectively. The adsorption performance of Cd(II) ion onto PANI-g-MGOs composites is remarkably increased by coexistent phenol, whereas the adsorption of phenol onto PANI-g-MGOs composites is not influenced with Cd(II) ion coexisting in binary solutions systems. The outer-sphere surface complexation or ion exchange is dominantly assigned to Cd(II) ion adsorption onto PANI-g-MGOs composites at low pH values, and then inner-sphere surface complexation is primary adsorption mechanism at high pH values. The adsorption performance of phenol onto PANI-g-MGOs is contributed to tc-rc conjugate interaction between aromatic ring of phenol and special structures of PANI-g-MGOs. The experimental results illustrate that PANI-g-MGOs composites can be utilized as latent adsorbents for efficient remove of cadmium ion and phenol from wastewater in environmental remediation. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.