亚氨基二乙酸树脂吸附钇(Ⅲ)的研究

The adsorption behavior and mechanism of a novel chelate resin, iminodiacetic acid resin (IDAAR) for Y(Ⅲ) were investigated. The statically saturated adsorption capacity is 102mg·g^-1 resin at 298K in HAc-NaAc medium at pH 5.7. Y(Ⅲ) adsorbed on IDAAR can be reductively eluted by 1.0～4.0mol·L^-1 HCl used as eluant and the elution percentages are almost as high as 100%. The resin can be regenerated and reused without apparent decrease in adsorption capacity. The apparent adsorption rate constant is k₂₉₈=3.36×10^-5s^-1. The adsorption behavior of IDAAR for Y(Ⅲ) conforms to Freundlich′s model reasonably. The thermodynamic adsorption parameter, enthalpy change ΔH of IDAAR for Y(Ⅲ) is 18.6kJ·mol^-1. The complex molar ratio of the functional group of IDAAR to Y(Ⅲ) is about 3∶1. The adsorption mechanism of IDAAR for Y(Ⅲ) was examined by using chemical method and IR spectrometry.     

Microwave-Promoted Rapid Synthesis of 1-Aryl-1,2,3-Triazoles

1, 2, 4- and 1, 2, 3-triazole derivatives have found wide applications as plant growth regulators1, bactericides and medical fungicides2, insecticides3 and in dyeing and color development4.One of the general routes of synthesis of 1-aryl-1, 2, 3-triazoles was to treat aryl azides with a-keto phosphorus ylides in dry refluxing benzene for 0.5 to 2 days5. Herein we report, for the first time, a very quick and simple, microwave-promoted synthesis of 1-aryl-1, 2, 3-triazoles 3 from aryl azides 1 an…     

Superhydrophobic hierarchical porous divinylbenzene polymer for BTEX sensing and toluene/water selective detection

This work reports a superhydrophobic divinylbenzene polymer with hierarchical porous structure as sensing material to modify the quartz crystal microbalance (QCM) to detect benzene, toluene, ethylbenzene, and xylene (BTEX) vapor. Notably, sensing results toward toluene vapor in different relative humidities indicates that this superhydrophobic polymer has favorable toluene/water selective detection performance. Besides, the limit of detection toward toluene is lower than 1 ppm.     

Clean preparation of S-thiocarbamates with in situ generated hydroxide in 2-methyltetrahydrofuran

A simple and clean protocol for the synthesis of various alkyl and (hetero)aryl S-thiocarbamates was established. The usage of in situ generated hydroxide as both an oxygen source and hydrogen source as well as biomass-derived 2-methyltetrahydrofuran as a green reaction medium, the avoidance of phosphorus-containing reductant, and the generation of harmless water and nitrogen as the side-products have given the present method atom-economy and environmental friendliness.     

Synthesis of α-Amino Unsymmetrical Diorganyl Selenides via Novel Synthetic Auxiliary Benzotriazole Promoted by Samarium Dhodide

α -Amino unsymmetrical diorganyl selenides are synthesized through nucleophilic substitution of a benzotriazolate anion by selenolates promoted by samarium diiodide.     

Two-dimensional covalent organic framework nanosheets: Synthesis and energy-related applications

Two-dimensional(2D) covalent organic framework nanosheets(CONs) are attracting increasing research attention because of their unique properties derived from their ultrathin thickness, high surface-tovolume atomic ratio, and extremely large surface area. 2D CONs can provide high transport pathways for charge carriers(e.g., electrons, holes and ions) through either the conjugated skeletons or the open channels. Therefore, they have shown great potential in energy related applications. In this revi...     

Dielectrical behavior of nanostructured α-Fe2O3 with different annealed temperatures

The spectra of the dielectrical constant and dielectrical loss in three nanostructured α-Fin2₃ samples at different annealed temperatures are measured by using ac LRC method. The relaxation times of polarization and the conductance are calculated by means of the Debye mechanism and the interface effects in two kinds of polarization processes with two different relaxation times are proposed. Project supported by the Natural Science Foundation of zhejiang Province and the Chinese Postdoctoral Foundation.     

溶剂热法合成CdSxSe1-x棒状纳米材料

以乙二胺为溶剂，制备了直径为10～20 nm、长度100～150 nm的棒状CdS_xSe_1-x纳米晶体，并对其形成过程及机理进行了探讨。研究发现CdS_xSe_1-x纳米晶体在120 ℃下就可形成且纳米棒的形貌不受温度及反应物配比的影响。紫外-可见光谱表明得到的CdS_xSe_1-x纳米晶体的光学性质可通过简单改变反应物中S与Se的配比进行调控。     

Chiral α-branched mono phosphine auxiliaries,reversal of sense of asymmetric induction upon substitution

A group of 10 (mono- or bis-) α-chiral mono phosphine ligands was synthesized from enantiopure phosphepine sulfide 3 by one or two subsequential highly diastereoselective α-deprotonation/alkylation steps, followed by desulfuration with Raney nickel. Their relative configuration was determined by X-ray crystal structure analysis. The new monophosphine ligands were tested in asymmetric hydrogenation, hydroboration, and Suzuki–Miyaura coupling showing asymmetric inductions up to 91% ee. In the case of hydrogenation, clear evidence was found that enantioselectivity is substantially controlled through α-C chirality rather than through biaryl chirality, which was demonstrated by a change of the sense of asymmetric induction upon change of substituents.     

Ionic liquid of [Bmim]Cl for the preparation of hierarchical nanostructured rutile titania

The rutile titania with hierarchical nanostructure was conveniently prepared in a room temperature ionic liquid (RTIL) of [Bmim]⁺Cl⁻ system. The obtained materials were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N₂ adsorption-desorption analysis. XRD patterns revealed that only rutile phase was formed in the ionic liquid of [Bmim]⁺Cl⁻. The SEM and TEM micrographs as well as N₂ adsorption-desorption measurements showed that the nanorods of rutile titania were interaggregated to fabricate a large mesoporous structure and the voids packed in the nanorods formed a small mesostructure. It was proposed that the formation of rutile crystal phase was due to high acidity and high Cl⁻ content in the special reaction media, and also the combination of ionic liquid-templated effects with so-called reaction limited aggregation resulted in the hierarchical nanostructure.