Binder-free production of 3D N-doped porous carbon cubes for efficient Pb2+ removal through batch and fixed bed adsorption
Binder-free production of 3D N-doped porous carbon cubes for efficient Pb2+ removal through batch and fixed bed adsorption
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DOI：
10.1016/j.jclepro.2017.08.229
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发表时间：
2017-12
影响因子：
11.1
通讯作者：
S. Sawant;R. Pawar;Seung-Mok Lee;M. Cho
中科院分区：
文献类型：
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作者：
S. Sawant;R. Pawar;Seung-Mok Lee;M. Cho
采用一种简单、无粘结剂的方法制备了不同氮含量和不同密度的氮掺杂碳立方体（NCCs），该方法包括在三聚氰胺海绵骨架中固化具有不同RF含量的RF凝胶。除了坚固的结构和氮掺杂之外，NCC的孔隙率可以在具有大孔、中孔和微孔的独特组合的中孔和超微孔内容易地定制。所制备的NCC表现出优异的吸收能力，范围从32.1至39.3 mg/g Pb 2+离子，由于其高表面积（高达675 m2/g）和氮掺杂（最大）。4.9重量%).将NCC-10吸附Pb 2+的性能与目前广泛使用的商用3D炭吸附剂进行了比较。发现NCC-10的重量和表面积归一化的Pb 2+吸附容量分别比商业活性炭颗粒高3.7倍和6.6倍。连续模式模型数据与固定床实验结果吻合较好，负载量为8.95 mg/g，证明NCC-10是一种有效的三维吸附剂。所制备的NCC可作为一种实用的吸附剂用于去除Pb 2+离子，因为它们的高吸附容量，易于再生，并在较长的重复使用后保持异常的稳定性。
N-doped carbon cubes (NCCs) with varying nitrogen contents and different densities were fabricated using a simple and binder-free method that involved the curing of resorcinol-formaldehyde (RF) gel with different RF contents in the framework of a melamine sponge. In addition to the robust structure and nitrogen doping, the porosity of the NCCs could be tailored easily within the mesopores and ultra-micropores with a unique combination of macro, meso, and micropores. The prepared NCCs exhibited excellent uptake capacity, ranging from 32.1 to 39.3 mg/g Pb2+ions, owing to their high surface area (up to 675 m2/g) and nitrogen doping (max. 4.9 wt. %). The Pb2+adsorption property of NCC-10 was also compared with that of widely used commercial 3D carbon adsorbents. The weight and surface area-normalized Pb2+adsorption capacity of NCC-10 was found to be 3.7 and 6.6 times higher, respectively than the commercial activated carbon granules. The continuous mode model data fitted with experimental fixed-bed results well, and showed 8.95 mg/g loading capacity, proving that NCC-10 is an effective 3D adsorbent. The prepared NCCs could be used as a practical adsorbent for the removal of Pb2+ions because of their high adsorption capacity, easy regeneration, and exceptional stability maintained after longer reuse.