Hierarchically Designed Nickel‐Entangled Carbon Sphere with Superior Adsorption Properties

Abstract

In this work, a C@Ni hierarchical structure was carefully designed by entangling carbon microspheres with curving nickel nanosheets. The presence of copious mesopores between adjoining nanosheets and microspheres greatly enhanced the specific surface area from 314.7 m2 g−1 for pristine carbon spheres to 448.7 m2 g−1 for this well‐designed C@Ni architecture. This salient structural feature enabled it as an ideal magnetic adsorbent for CrVI removal in wastewater. The high CrVI adsorption capacity of ca. 550 mg g−1 at 298 K, remarkable adsorption rate of 3.38 mg g‐1 min‐1 and excellent regeneration efficiencies above 90% were highly desirable for its widespread potential applications in water treatment.

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

“…According to the Scherrer formula [36], the average particle size of metal nickel nanocrystals is deduced to be about 2.4 nm, which is in good agreement with the results of HRTEM. Moreover, there is a protrusion between 15-30°, which can be attributed to the presence of amorphous carbon phase [19,36]. Compared with the XRD curves of carbon spheres (Figure 4a), this protrusion is attributed to carbon spheres.…”

“…However, the separation and recovery of carbon materials is difficult, which limits its application. So as a new type of magnetic nanomaterial, the carbon-supported metal nickel composite also exhibits the potential application as adsorbent in wastewater treatment [19].…”

Preparation and Characterization of Porous Carbon@ZnO‐NPs for Organic Compounds Removal: Classical Adsorption Versus Ultrasound Assisted Adsorption

“…It is noteworthy to note that magnetic and dielectric oxides have been also used for environmental remediation . Among the techniques used for environmental, adsorption using solid adsorbents has gained particular attention among the worldwide researchers as being highly efficient, of low operating cost with a simple operation process and capable for large scale pollutants removal . Commercial activated carbon, clays and zeolites are the most important adsorbents that have been used so far .…”