Direct removal of
99
TcO
4
–
from alkaline nuclear
waste is desirable because of the nuclear
waste management and environmental protection relevant to nuclear
energy but is yet to be achieved given that combined features of decent
base-resistance and high uptake selectivity toward anions with low
charge density have not been integrated into a single anion-exchange
material. Herein, we proposed a strategy overcoming these challenges
by rationally modifying the imidazolium unit of a cationic polymeric
network (SCU-CPN-4) with bulky alkyl groups avoiding its ring-opening
reaction induced by OH
–
because of the steric hindrance
effect. This significantly improves not only the base-resistance but
also the affinity toward TcO
4
–
as a result
of enhanced hydrophobicity, compared to other existing anion-exchange
materials. More importantly, SCU-CPN-4 exhibits record high uptake
selectivity, fast sorption kinetics, sufficient robustness, and promising
reusability for removing
99
TcO
4
–
from the simulated high-level waste stream at the U.S. Savannah
River Site, a typical alkaline nuclear waste, in both batch experiment
and dynamic column separation test for the first time.
This review systematically summarizes the preparation strategies of metal–organic frameworks and their derivatives with graphene composites for promising applications in electrocatalysis and photocatalysis.
In this work, nitrogen-doped LaNiO perovskite was prepared and studied, for the first time, as a bifunctional electrocatalyst for oxygen cathode in a rechargeable lithium-oxygen battery. N doping was found to significantly increase the Ni contents and oxygen vacancies on the bulk surface of the perovskite, which helped to promote the oxygen reduction reaction and oxygen evolution reaction of the cathode and, therefore, enabled reversible LiO formation and decomposition on the cathode surface. As a result, the oxygen cathodes loaded with N-doped LaNiO catalyst showed an improved electrochemical performance in terms of discharge capacity and cycling stability to promise practical Li-O batteries.
Intraperitoneal
adhesions are common and serious complications
after surgery. Deposition of proteins and inflammatory response on
an injured cecum are the main factors resulting in the formation of
adhesion. In this study, purely zwitterionic hydrogels (Z-hydrogels)
are developed using thiolated poly(sulfobetaine methacrylate-co-2-((2-hydroxyethyl)disulfanyl)ethyl methacrylate) [poly(SBMA-co-HDSMA)] as the network backbone and divinyl-functionalized
sulfobetaine (BMSAB) as the zwitterionic cross-linker via the thiol–ene
click reaction. To improve the anti-inflammatory activity, cefoxitin
sodium is loaded into Z-hydrogels (Z/C-hydrogel) to construct the
physical barrier/drug system. The gelation time, mechanical behavior,
and swelling ratio of the prepared Z-hydrogel can be modulated via
adjusting the SBMA/HDSMA ratio in the copolymer. Moreover, they not
only exhibit excellent resistance to protein and fibroblast adhesion
but also show good biocompatibility and hemocompatibility. To assess
its anti-adhesion effects in vivo, the Z-hydrogel is injected on the
injured cecum surface using a rat model of sidewall defect-cecum abrasion.
The results show that the Z-hydrogel can completely cover the irregular
cecum surface and effectively suppress the formation of postoperative
adhesion via reducing protein deposition and resisting fibroblast
adhesion. Moreover, the introduction of cefoxitin sodium decreases
the inflammatory response after surgery, thus further improving the
anti-adhesion effect. Overall, we suggest that the Z-hydrogel is a
promising candidate for the prevention of a postsurgical peritoneal
adhesion.
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