Biomass-derived nitrogen-doped hierarchically porous carbon networks as efficient absorbents for phenol removal from wastewater over a wide pH range
Biomass-derived nitrogen-doped hierarchically porous carbon networks as efficient absorbents for phenol removal from wastewater over a wide pH range
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生物质衍生的氮掺杂分级多孔碳网络作为有效吸收剂，用于在广泛的 pH 范围内去除废水中的苯酚
DOI：
10.1039/c7ra08374b
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发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Wang, Feng
中科院分区：
文献类型：
--
作者：
Du, Wenyi;Sun, Junting;Wang, Feng
开发具有大吸附容量和宽pH范围内上级可回收性的低成本多孔炭吸附剂是有效去除工业废水中有毒苯酚的关键。在这里，我们展示了一个简单而有效的策略，用于合成氮掺杂的分级多孔碳（NHPC）网络衍生自牛骨作为一个高效的吸附剂去除废水中的苯酚。如此制备的NHPC具有高比表面积（2687 m2 g-1）、独特的三维（3D）分级多孔结构和高氮掺杂含量（2.31原子%）。结果，NHPC对苯酚表现出显著的吸附性能，具有431 mg g-1的显著大的吸附容量（是商业吸附剂（Norit CGP）的3.56倍），4.57 g mg−1 h−1的高吸附率（是Norit CGP的17倍）和出色的可回收性，在5次循环后保持98%的初始吸附能力（Norit CGP为75%）。更重要的是，NHPC在pH 2-9的宽范围内保持几乎相同的最大吸附容量，显示出良好的适用性，从各种废水中去除苯酚。热力学和动力学分析表明，该吸附过程为自发放热过程，符合Langmuir吸附等温式和准二级动力学模型。这种具有良好分级孔隙率的生物质基多孔炭可以作为一种有前途的吸附剂，用于有效地去除废水中的苯酚。
Developing cost-effective porous carbon adsorbents with large adsorption capacity and superior recyclability over a wide pH range is critical for the efficient removal of toxic phenol from industrial wastewater. Herein, we demonstrate a facile and effective strategy for synthesis of a nitrogen-doped hierarchically porous carbon (NHPC) network derived from cattle bone as a highly efficient adsorbent for the removal of phenol from wastewater. The as-prepared NHPC possessed a high specific surface area (2687 m2 g−1), a unique three-dimensional (3D) hierarchical porous structure and high content of nitrogen doping (2.31 at%). As a result, NHPC exhibited a remarkable adsorption performance towards phenol with a significantly large adsorption capacity of 431 mg g−1 (3.56-fold that of the commercial adsorbent (Norit CGP)), a high adsorption rate of 4.57 g mg−1 h−1 (17-fold that of Norit CGP) and an outstanding recyclability with 98% of the initial adsorption capacity maintained after 5 cycles (75% for Norit CGP). More importantly, the NHPC held almost the identical maximum adsorption capacity over a wide pH range of 2–9, showing a good applicability in the removal of phenol from a variety of wastewaters. Thermodynamic and kinetics analyses indicated that the adsorption process was spontaneous and exothermic, which fitted well the Langmuir isotherm model and pseudo-second-order model. This biomass-based porous carbon with well-defined hierarchical porosity can be applied as a promising adsorbent for efficient removal of phenol from wastewater.