<b>Abstract</b><br/>In this study, a biocomposite containing nickel nanoparticles (OP-Ni) synthesized from orange peel (OP) waste was used to synthesize alginate nickel orange-peel beads (Alg/OP-Ni). The biocomposite was characterized using Fourier Transform Infrared Spectroscopy, X-ray diffraction, Field Emission Scanning Electron Microscopy, and Energy Dispersive X-ray spectroscopy. The co-adsorption characteristics of Cd (II) and Pd (II) ions from synthetic aqueous solutions using the newly prepared biocomposite were investigated with respect to pH, biomass dosage, contact time, initial concentration of ions, temperature, and stirring rate. Co-adsorption equilibrium data were modeled using Langmuir, Freundlich, and Dubinin-Ransehkevich (D-R) isotherms. The experimental data fitted well on the Langmuir isotherm suggesting the monolayer adsorption of the cadmium and lead ions onto Alg/OP-Ni. The monolayer adsorption capacity of Alg/OP-Ni for Cd (II) and Pd (II) ions obtained were 138 and 276 mg/g in monocomponent solutions and 224 and 317 mg/g in binary solution, respectively. D-R isotherm model data suggest that the co-adsorption process could include an important physisorption stage. Kinetic studies showed that the adsorption followed a pseudo-second-order kinetic model. Thermodynamic parameters indicated that Cd (II) and Pd (II) ions co-adsorption process was feasible, endothermic, and spontaneous in nature under-examined conditions.<br/>Compared with other adsorbents, Alg/OP-Ni exhibited a greater adsorption capacity in both mono- and bi-component solutions, confirming that the biocomposite beads containing nickel nanoparticles can be suitable for the removal of heavy metals from wastewaters such as mining wastewaters.

Biocomposite beads containing nickel nanoparticles for Cd (II) and Pd (II) removal from wastewater

ACS Spring 2022

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