Adsorption Behavior of Magnetic Carbon-Supported Metal Nickel for the Efficient Dye Removal from Water

Abstract

Magnetic carbon-supported metal nickel has been successfully synthesized by solvothermal method and heat treatment for highly effective adsorption of various reactive dyes. Structure characterization and composition analysis demonstrated that the metal nickel nanoparticles with the size of 1–2 nm were embedded into the pore of carbon spheres. It is helpful to prevent the agglomeration and falling off of metal nickel nanoparticles on the surface of carbon spheres. The adsorption performance of the carbon-supported metal nickel nanospheres for reactive brilliant yellow R-4GLN was studied by changing the pH value and initial concentration of the solution, adsorption time, adsorption temperature, and the amount of adsorbent. The carbon-supported metal nickel showed fast and efficient adsorption activity. After 5 min of adsorption, the removal efficiency of 10 mL 25 mg·mL−1 reactive brilliant yellow R-4GLN was close to 100%. The carbon-supported metal nickel composite was reused 20 times, and the removal efficiency of dye remained above 98%. It also showed good adsorption performance on various reactive dyes with wide universality, which has a certain adsorption effect on most dyes with a high utilization value in wastewater treatment.

Protein‐based metal bio‐cleaner for detoxification of wastewater

“…Table 2 presents the corresponding isotherm parameters and their correlation coefficients ( R 2 ). Figs S4(a) and (b) (supporting information) and Table 2 show high R 2 for the Langmuir isotherm model ( R 2 > 0.976) when compared with the Freundlich model 32 (Figs S4(c) and (d); R 2 > 0.838). It becomes evident that the Langmuir isotherm model best fits the experimental data, while the Freundlich model does not fit the experimental data, confirming that no adsorption occurs at heterogeneous sites.…”

“…The Langmuir adsorption isotherm is specifically for monolayer adsorption based on the assumption that the reactive groups in a medium are homogeneously distributed over a surface without any lateral interaction. The Freundlich isotherm is often used for the adsorption at heterogeneous sites on a surface with adsorption equilibria between a solid substrate and a solution 32 Figure S4. (supporting information) shows Langmuir and Freundlich isotherms of the two adsorbents (GFP and amGFP) by nonlinear curve fitting analysis.…”

“…Further, no adsorption occurs after reaching the saturation value, which assumes no interaction between molecules on neighboring sites. [31][32][33][34] In addition, the mode of adsorption of Cu 2+ ions on amGFP is homogeneous which best fits the Langmuir isotherm adsorption model. This indicates that adsorption of Cu 2+ ions is uniform in nature.…”

“…The immobilizing agent FGAC was prepared by chemical modification of GAC. [30][31][32][33] The hydraulic retention time was varied from 0 to 120 min. There were two set bioreactors: the first reactor contained FGAC-immobilized GFP and the second reactor consisted of FGAC-immobilized amGFP.…”

“…The Freundlich isotherm is often used for the adsorption at heterogeneous sites on a surface with adsorption equilibria between a solid substrate and a solution. 32 Figure S4 (supporting information) shows Langmuir and Freundlich isotherms of the two adsorbents (GFP and amGFP) by nonlinear curve fitting analysis. The Langmuir adsorption isotherm model fitted for GFP and amGFP suggested monolayer, uniform and finite adsorption sites.…”