Structural control of a novel hierarchical porous carbon material and its adsorption properties

Abstract

Novel hierarchical porous carbon materials (HPCs) were fabricated via a reactive template-induced in situ hypercrosslinking procedure. The effects of carbonization conditions on the microstructure and morphology of HPCs were investigated, and the adsorption of methylene blue (MB) on HPCs was explored. The as-prepared HPCs has a hierarchical micro-, meso- and macropore structure, which results from the overlap of hollow nanospheres possessing microporous shells and macroporous cavities. The carbonization temperature, carbonization time and carbonization heating rate played important roles in tailoring the nanostructures of HPCs. The BET specific surface area and micropore specific surface area can reach 2388 m2 g−1 and 1892 m2 g−1, respectively. Benefitting from the well-developed pore structure, the MB removal efficiency can exceed 99% under optimized conditions. The adsorption kinetics and thermodynamics can be well described by a pseudo-second-order model and Langmuir model, respectively. Furthermore, such adsorption was characterized by a spontaneous endothermic process.

The role of adsorbent microstructure and itspacking arrangement in optimising theperformance of an adsorption column

“…This indicates that the optimum radius of pore is between 20 and 200 µm, which correlates to the macropore region of a capillary size. Although this is higher than the typical pore size of common adsorbents [35][36][37], it is appropriate for crafted materials with controlled structures [38][39][40][41]. Moreover, it indicates that the model is capable of predicting optimal pore size conditions, which will change with the physical parameters of a particular system.…”

Carbon Nanocage Confining CuCo Bimetallic Interface with Low Nitrate Adsorption Energy for Highly Efficient Electrochemical Ammonia Synthesis

“…The electrocatalytic synthesis of ammonia from nitrate using non-noble metal-based catalysts is a more flexible and low-cost method. − Non-noble transition metals, such as Cu, Fe, and Co, are catalytically active for the NITRR process, and Cu-based catalysts exhibit great activities. − As an ideal support for metal nanoparticles, porous carbon materials can not only reduce the aggregation of nanoparticles but also promote electron and mass transfer. − Encapsulation and confinement of Cu nanoparticles in porous carbon frames by high-temperature carbonization is a promising approach to increase the activity, selectivity, and stability of Cu-based electrocatalysts. , Metal–organic frameworks have been considered ideal templates for the fabrication of carbon-supported metal nanoparticles because the use of the coordination metal and monomer can be adjusted and is flexible, and high specific surface areas and uniform active structures can be achieved. − However, carbon-supported single metallic Cu-based catalysts often suffer from significant deactivation during long-term operation due to surface passivation, metal leaching, and particle aggregation …”