Free-standing carbon nanotube/graphene hybrid papers as next generation adsorbents

Abstract

The adsorption of a series of aromatic compounds from aqueous solution onto purified, free-standing single-walled carbon nanotube/graphene nanoplatelet hybrid papers is studied both experimentally and theoretically. Experimental data is obtained via changes in optical absorption spectra of the aqueous solutions and is used to extract all parameters required to implement a semi-empirical mass-transfer model. Agreement between experiment and theory is excellent and data from all compounds can be cast on a universal adsorption curve. Results indicate that the rate of adsorption and long-time capacity of many aromatic compounds on hybrid paper adsorbent significantly exceeds that of activated carbon by at least an order of magnitude. The combination of carbon nanotubes and graphene also promotes on the order of a 25% improvement in adsorption rates and capacities than either component alone. Hybrid nanocomposites show significant promise as adsorption materials used for environmental remediation efforts.

Facile preparation of porous organic copolymer based on triptycene and crown ether for efficient organic dye adsorption

“…[3][4][5] Traditional porous materials such as activated carbon, 6 zeolites, 3,7 and mesoporous silica 8 have the disadvantage of low adsorption capacities. To facilitate the efficiency of removing organic dyes, many advanced adsorbents such as carbon nanotubes, 9 porous BN nanosheets, 10 and porous graphene 11 have been developed. However, because multi-step synthesis is necessary to produce these functionalized porous polymers, further applications may potentially be limited.…”

On the Choice of Batch or Fixed Bed Adsorption Processes for Wastewater Treatment

“…[24][25][26] Newly emerged nanostructures such as graphene, carbon nanotubes (CNTs), and their derivatives have shown great potential to remove various contaminants from aqueous systems. [27][28][29] Graphene and CNTs typically exhibit increased adsorption capacities than AC for both organic [28][29][30][31][32][33][34][35] and inorganic [36][37][38][39][40] compounds; this increase is attributed to their high specific surface area, large delocalized π electrons and hydrophobic surfaces.…”

Highly Dispersed DPPF Locked in Knitting Hyper‐Crosslinked Polymers as Efficient and Recyclable Catalyst

“…Additionally, adsorption can also be used for source reduction and reclamation for potable, industrial and other water purposes . Consequently, a lot of advanced adsorbents like nanostructured metal oxides, carbon nanotubes, nanosheets and zeolites have been applied. In recent years, various porous materials have been used for the removal of heavy metal ion and organic pollutants from water, for some cost‐effective adsorbents such as microporous carbon, graphene and natural fibers .…”