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.
Highlights
With the rapid growth of population and economy, environmental pollution has been an important problem affecting people’s healthy life
When the metal nickel is loaded on the carbon spheres, the obtained product exhibits the morphology and size similar to carbon spheres (Figure 1c)
Based on the further observation from the HRTEM image (Figure 1d), it is found that the spheres are complete and don’t intersect with each other, indicating the good dispersion
Summary
With the rapid growth of population and economy, environmental pollution has been an important problem affecting people’s healthy life. Efficient removal of colored wastewater is very important to alleviate environmental pollution [3,4,5]. Various technologies, such as ion-exchange [6], ozonation [7], chemical precipitation [8], electrochemical treatment [9], membrane separation [10], photocatalysis [11], and adsorption [12], have been developed to purify wastewater. Carbon materials from various carbon sources have been widely applied as adsorbents for the removal of inorganic and organic pollutions from water [16,17,18]
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