Nowadays, physical absorption has become a feasible method offering an efficient and green route to remove organic pollutants from the industrial wastewater. Inspired by polydopamine (PDA) chemistry, one-dimensional PDA-functionalized multiwalled carbon nanotubes (MWCNT-PDA) were creatively introduced into graphene aerogel framework to synthesize a robust graphene/MWCNT-PDA composite aerogel (GCPCA). The whole forming process needed no additional reducing agents, significantly reducing the contamination emissions to the environment. The GCPCA exhibited outstanding repeatable compressibility, ultralight weight, as well as hydrophobic nature, which were crucial for highly efficient organic pollution absorption. The MWCNTs in moderate amounts can provide the composite aerogels with desirable structure stability and extra specific surface area. Meanwhile, the eventual absorption performance of GCPCAs can be improved by optimizing the microporous structure. In particular, a novel "cabbagelike" hierarchical porous structure was obtained as the prefreezing temperature was decreased to -80 °C. The miniaturization of pore size around the periphery of GCPCA enhanced the capillary flow in aerogel channels, and the super-absorption capacity for organic solvents was up to 501 times (chloroform) its own mass. Besides, the GCPCAs exhibited excellent reusable performance in absorption-squeezing, absorption-combustion, and absorption-distillation cycles according to the characteristic of different organic solvents. Because of the viable synthesis method, the resulting GCPCAs with unique performance possess broad and important application prospects, such as oil pollution cleanup and treatment of chemical industrial wastewater.
Lithium–sulfur (Li–S) batteries with high theoretical capacity and low cost are challenged by the polysulfide shuttle effect and sluggish reaction kinetics.
Though
being a promising anode material for sodium-ion batteries
(SIBs), MoS2 with high theoretical capacity shows poor
rate capability and rapid capacity decay, especially involving the
conversion of MoS2 to Mo metal and Na2S. Here,
we report all-in-one MoS2 nanosheets tailored by porous
nitrogen-doped graphene (N-RGO) for the first time to achieve superior
structural stability and high cycling reversibility of MoS2 in SIBs. The all-in-one MoS2 nanosheets possess desirable
structural characteristics by admirably rolling up all good qualities
into one, including vertical alignment, an ultrathin layer, vacancy
defects, and expanded layer spacing. Thus, the all-in-one MoS2@N-RGO composite anode exhibits an improvement in the charge
transport kinetics and availability of active materials in SIBs, resulting
in outstanding cycling and rate performance. More importantly, the
restricted growth of all-in-one MoS2 by the porous N-RGO
via a strong coupling effect dramatically improves the cycling reversibility
of conversion reaction. Consequently, the all-in-one MoS2@N-RGO composite anode demonstrates excellent reversible capacity,
outstanding rate capability, and superior cycling stability. This
study strongly suggests that the all-in-one MoS2@N-RGO
has great potential for practical application in high-performance
SIBs.
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