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•A cage-based molecular switched adsorbent for dye removal was designed.•It exhibits unusually high selectivity for triphenylmethane dyes.•Its negatively charged ring-opening tautomer ...is contributing to adsorption.•A mechanism involving charge-assisted hydrogen bonds explains adsorption behavior.
Exploring novel adsorbents for efficient water treatment is an essential and urgent task. Herein, we developed a cage-based molecular switched adsorbent for the selective removal of triphenylmethane dyes from water. The adsorbent’s negatively charged ring-opening tautomer could remove >95 % of triphenylmethane dyes within 60 min, with the removal of other dyes being <50 %. The maximum adsorption capacities for malachite green, crystal violet, and methyl blue were 340, 370, and 729 mg/g, respectively, corresponding to forming a 1:1 host–guest complex with the cage-based adsorbent molecules. The adsorbent can be easily regenerated through simple elution in a dilute alkaline solution and exhibited excellent reusability. The mechanistic analysis highlights the paramount influence of charge-assisted hydrogen bonding between the adsorbent and the dye in governing the adsorption process. Its strength can be predicted using the pKa slide rule theory and consistently aligned with the experimental observations. Our research offers valuable insights into the rational design of adsorbent structures.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Aqueous anion recognition using artificial receptors is of great interest but full of challenges. Typically, anion-selective receptors are designed by selecting scaffolds that have either hydrogen ...bonding sites or positively charged moieties. Herein, we constructed an acetate-responsive chromogenic molecular switch with a phenolphthalein backbone and achieved the visual recognition of acetate in pure water. UV–Vis and 1H NMR titration data reveal that the molecular switch receptor has good selectivity and binding towards acetate. Mechanistic studies have shown that this molecular switch-type anion receptor recognizes acetate through hydrogen bonding to facilitate proton transfer. Our findings are expected to pave the way for a new class of aqueous anion receptors and the development of new molecular recognition mechanisms.
A novel phenolphthalein-based molecular switchable anion receptor is capable of highly selective recognition of acetate in water via hydrogen bonding-induced proton transfer mechanisms. Display omitted
•New phenolphthalein-based molecular switched receptors for acetate were designed.•Solvent polarity governs the ratio of colored ring-opening to colorless ring-closed in molecular switch.•Acetate in pure water can be easily recognized with this receptor through the naked eye.•Acetate recognition mechanism involves hydrogen bonding-induced proton transfer.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Ultra-thin SiO
x
(0 <
x
< 2) nanosheets were obtained
via
a convenient solvothermal route from a Zintl compound CaSi
2
. After carbon coating, the SiO
x
@C nanosheet anodes exhibit high capacity, ...good rate and superior cycling performance for high-capacity lithium ion battery applications. The specific capacity can be maintained as high as 760 mA h g
−1
with almost no capacity decay after 400 cycles at a current density of 0.5 A g
−1
.
Ultra-thin SiO
x
nanosheets, made up of partly-oxidized Si single atomic layers, are prepared
via
a one-pot solvothermal method from a Zintl compound CaSi
2
. After carbon coating, the SiO
x
@C nanosheet composites show high capacity and long-term cycling stability when used as anode materials in lithium ion batteries.
Ultra-thin SiO sub(x) (0 < x< 2) nanosheets were obtained via a convenient solvothermal route from a Zintl compound CaSi sub(2). After carbon coating, the SiO sub(x)-C nanosheet anodes exhibit high ...capacity, good rate and superior cycling performance for high-capacity lithium ion battery applications. The specific capacity can be maintained as high as 760 mA h g super(-1) with almost no capacity decay after 400 cycles at a current density of 0.5 A g super(-1).
Ultra-thin SiO x (0 < x < 2) nanosheets were obtained via a convenient solvothermal route from a Zintl compound CaSi 2 . After carbon coating, the SiO x @C nanosheet anodes exhibit high capacity, ...good rate and superior cycling performance for high-capacity lithium ion battery applications. The specific capacity can be maintained as high as 760 mA h g −1 with almost no capacity decay after 400 cycles at a current density of 0.5 A g −1 .
Ultra-thin SiO(x) (0 < x < 2) nanosheets were obtained via a convenient solvothermal route from a Zintl compound CaSi2. After carbon coating, the SiOx@C nanosheet anodes exhibit high capacity, good ...rate and superior cycling performance for high-capacity lithium ion battery applications. The specific capacity can be maintained as high as 760 mA h g(-1) with almost no capacity decay after 400 cycles at a current density of 0.5 A g(-1).
Systemic inflammatory response has been implicated as a contributor to the onset of febrile seizures (FS). The four novel indices of the inflammatory response such as, neutrophil-to-lymphocyte ratio ...(NLR), mean platelet volume (MPV), platelet count (PLT) ratio and red blood cell distribution width (RDW) have been investigated in FS susceptibility and FS types (simple febrile seizure and complex febrile seizure). However, the potential role of these inflammatory markers and MPV/PLT ratio (MPR) in Chinese children with FS has yet to be fully determined. This study investigated the relevance of NLR, MPV, PLT, MPR and RDW in febrile children with and without seizures. 249 children with FS and 249 age matched controls were included in this study. NLR and MPR were calculated from complete blood cell counts prior to therapy. Differences in age, gender and these inflammatory markers between the FS group and the control group were evaluated using the chi-square test, t-test or logistic regression analysis. Receiver Operating Characteristic (ROC) curve was used to determine the optimal cut-off value of NLR and MPR for FS risk. Interactions between NLR and MPR on the additive scale were calculated by using the relative excess risk due to interaction (RERI), the proportion attributable to interaction (AP), and the synergy index (S). It has been shown that the elevated NLR and MPR levels were associated with increased risk of FS. The optimal cut-off values of NLR and MPR for FS risk were 1.13 and 0.0335 with an area under the curve (AUC) of 0.768 and 0.689, respectively. Additionally, a significant synergistic interaction between NLR and MPR was found on an additive scale. The mean levels of MPV were lower and NLR levels were higher in complex febrile seizure (CFS) than simple febrile seizure (SFS), and the differences were statistically significant. ROC analysis showed that the optimal cut-off value for NLR was 2.549 with 65.9% sensitivity and 57.5% specificity. However, no statistically significant differences were found regarding average values of MPR and RDW between CFS and SFS. In conclusion, elevated NLR and MPR add evidence to the implication of white cells subsets in FS risk, and our results confirmed that NLR is an independent, albeit limited, predictor in differentiating between CFS and SFS. Moreover, NLR and MPR may have a synergistic effect that can influence the occurrence of FS.
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IZUM, KILJ, NUK, PILJ, PNG, SAZU, UL, UM, UPUK
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