Removal of Cr 6+ from wastewater via adsorption with high-specific-surface-area nitrogen-doped hierarchical porous carbon derived from silkworm cocoon
Removal of Cr 6+ from wastewater via adsorption with high-specific-surface-area nitrogen-doped hierarchical porous carbon derived from silkworm cocoon
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DOI：
10.1016/j.apsusc.2017.02.044
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发表时间：
2017-05
影响因子：
6.7
通讯作者：
Junting Sun;Zhengping Zhang;J. Ji;M. Dou;Feng Wang
中科院分区：
文献类型：
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作者：
Junting Sun;Zhengping Zhang;J. Ji;M. Dou;Feng Wang
The development of highly efficient adsorbents is an effective way to remove Cr6+from wastewater for environment protection. Herein, a high-specific-surface-area nitrogen-doped hierarchical porous carbon (NHPC) derived from silkworm cocoon was synthesized and applied as an efficient adsorbent for the removal of Cr6+from wastewater. The resultant NHPC possesses a specific surface area as high as 3134 m2g−1and a unique hierarchical porous structure with a large number of small mesopores (2–4 nm) and micropores (0.8–2 nm) embedded in the sidewall of bowl-like macropores (200–300 nm), in which sufficient exposure of adsorption sites and high-flow transfer of Cr6+ions can be achieved. As a result, the NHPC exhibits a remarkable adsorption performance with a larger adsorption capacity (366.3 mg g−1), a higher adsorption rate (4 × 10−2g mg−1min−1) and a superior recyclability in comparison with the commercial adsorbent (Norit CGP). Thermodynamic and kinetic analyses indicate that the adsorption process is spontaneous and endothermic, which fits well with the pseudo-second-order kinetic model and Langmuir isotherm model. This biomass-based porous carbon with well-defined hierarchical porous structure can be applied as a promising adsorbent for the removal of Cr6+from wastewater.
