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Major Scientific and Technological Innovation Project of Shandong Province of China[2019JZZY010518]
No full text<p>Hybrid hydrogel microspheres loading single-hole hollow imprinted particles for fast and selective uptake of 2'& nbsp;-deoxyadenosine</p>
No full textHydrogel microspheres encapsulating molecularly imprinted polymers (MIPs) are promising hybrid sorbents, due to several advantages of high selectivity, fast mass transfer efficiency, and simple collection. Thus, Janus single hole hollow nanoparticles (J-HNPs) with the size of 550 +/-& nbsp; 70 nm were firstly designed by anisotropic emulsion template, and then MIPs were grafted onto their inner surface through electron transfer atom transfer radical polymerization (ARGET ATRP). Then as-prepared J-HNPs-MIPs were loaded into hydrogel microspheres via polymerizable water-in-oil (W/O) emulsion droplets combining gelatin methacryloyl (GMA) as monomers, and then obtained J-HNPs-MIPs@Gel with the mean diameter of 2.0 mu m was applied for effective and selective separation of 2'-deoxyadenosine (dA). Fast adsorption equilibrium of J-HNPs-MIPs@Gel for dA can be achieved within 40 min, thanks to the hydrogel matrix and single-hole hollow structure for enhancing diffusion. The maximum multi-layer adsorption capacity calculated according to the Freundlich model was 10.31 mu mol g(-1) at 298 K. The specific memory to the size, shape and functional groups of dA endowed excellent recognition ability, and 88% of the initial capacity after four consecutive adsorption-desorption cycles was maintained. In addition, J-HNPs-MIPs@Gel was expected to show great potential for the selective enrichment and analysis of target dA molecule in complex biological samples
Atomically dispersed Sn incorporated into carbon matrix for stable electrochemical lithium storage
No full textAlthough possessing a high specific capacity, the practical implementation of SnO2 nanoparticles as a promising anode for lithium-ion batteries (LIBs) is hampered by their poor cyclability. This work demonstrates that incorporating single atomic Sn (SASn) species into a carbon matrix can address this issue effectively. The SASn/C composite was synthesized via polymerization of formaldehyde and 3-aminophenol in the presence of Tin(II) chloride, followed by pyrolysis. The SASn atoms were homogeneously dispersed in the carbon matrix. Each Sn atom coordinated with two O and two C atoms, forming the Sn-O-C and Sn-C bonds, providing channels for fast electron/ion transfer and boosting electrochemical kinetics. The SASn/C anode exhibited unique lithium storage behaviors, enhanced lithium storage capability, and excellent cyclic stability with a capacity fading rate of 0.0031% per cycle at 1000 mA g(-1) after 7000 cycles. Density functional theory calculations reveal that one SASn atom can adsorb three Li+ ions at the fully discharged state during the discharging process. Subsequently, the Li+ ions are directly desorbed from the SASn atom, which is different from the traditional multi-step de-alloying process. This facile strategy represents a significant advancement in developing high-performance Sn-based anode materials for LIBs
<p>New understanding of extraction and separation of vanadium(IV), iron and titanium using iron powder induction-leaching and P204-P507 synergistic extraction</p>
No full textHerein, we investigated the induced-leaching behavior of hematite by iron powder after ammonium sulfate roasting vanadium titanomagnetite concentrate and develop a P204-P507 synergistic extraction method for separation of vanadium(IV), iron and titanium. The results showed that the effective selective separation of vanadium, iron and titanium could be obtained in which 97.39 % V and 88.62% Fe were dissolved into the solution and over 91.76% Ti was remained in leaching residue after leaching at 0.5 M H2SO4, 110 ?& nbsp;for 1 h, then added 10% iron powder and continue to leaching for 2 h. Tafel polarization curve and impedance spectroscopy both proved that iron powder could reduce the chemical reaction resistance and accelerate the ion transfer rate in the leachate. Based on the speciation analysis by Medusa software, the speciation distribution of vanadium, iron and titanium in the sulfuric acid system eventually exists in the form of VO(2+ )and Fe(II) ions, while most of titanium precipitates to the leaching residue in the form of TiO2. The five stages countercurrent extraction test was carried out to confirm the prediction of McCabe-Thiele diagram, and the extraction efficiency of vanadium reached 98.13% under the condition of mixed extractant concentration of 15%, v(P204):v(P507) of 3, pH of 1.8 and phase ratio (O/A) of 2.0. The slope method proved that P204-P507 molecule could release two H+ ions for every vanadium ion extracted, which could be attributed to the cation exchange reaction. Finally, a high-titanium slag with a TiO2 content of 85.32% was obtained by alkaline leaching method
