4480-83-5Relevant articles and documents
Synthesis and characterization of magnetic mesoporous Fe3O4@mSiO2-DODGA nanoparticles for adsorption of 16 rare earth elements
Li, Jingrui,Gong, Aijun,Li, Fukai,Qiu, Lina,Zhang, Weiwei,Gao, Ge,Liu, Yu,Li, Jiandi
, p. 39149 - 39161 (2018/12/02)
In this study, novel magnetic mesoporous Fe3O4@mSiO2-DODGA nanoparticles were prepared for efficiently adsorbing and recycling REEs. Fe3O4@mSiO2-DODGA was characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). The adsorption behavior of Fe3O4@mSiO2-DODGA was investigated by ICP-OES. The results showed that the content of DODGA in the adsorbent was 367 μmol g-1. Fe3O4@mSiO2-DODGA exhibited the highest adsorption rates for 15 REEs, except Tm, in a 2 mol L-1 nitric acid solution. Among these elements, the adsorption rates for Nd, Sm, Eu, Dy, Ho, Yb, Lu, Y and Sc ranged from 85.1% to 100.1%. The desorption rates for all 16 REE ions reached their maximum values when 0.01 mol L-1 EDTA was used as the eluent. The desorption rates for Nd, Ce, Sm, Eu, Ho, Yb, Lu, Y, and Sc were 87.7-99.8%. Fe3O4@mSiO2-DODGA had high stability in 2 mol L-1 HNO3 and could be used five times without significant loss of adsorption capacity. Moreover, these nanoparticles had high selectivity, and their adsorption rate was not affected even in a high-concentration solution of a coexisting ion. Therefore, 8 REE ions (Nd, Sm, Eu, Ho, Yb, Lu, Y, and Sc) were selected for the study of adsorption kinetics and adsorption isotherm experiments. It was demonstrated that the values of Qe (equilibrium adsorption capacity) for Nd, Sm, Eu, Ho, Yb, Lu, Y, and Sc were 14.28-60.80 mg g-1. The adsorption of REEs on Fe3O4@mSiO2-DODGA followed the pseudo-second-order kinetic model, Elovich model and Langmuir isotherm model, which indicated that the adsorption process of Fe3O4@mSiO2-DODGA for REEs comprised single-layer adsorption on a non-uniform surface controlled by chemical adsorption. It was concluded that Fe3O4@mSiO2-DODGA represents a new material for the adsorption of REEs in strongly acidic solutions.
Heterogeneous catalysts for the cyclization of dicarboxylic acids to cyclic anhydrides as monomers for bioplastic production
Rashed, Md. N.,Siddiki,Ali, Md. A.,Moromi, Sondomoyee K.,Touchy, Abeda S.,Kon, Kenichi,Toyao, Takashi,Shimizu, Ken-Ichi
, p. 3238 - 3242 (2017/07/28)
Cyclic anhydrides, key intermediates of carbon-neutral and biodegradable polyesters, are currently produced from biomass-derived dicarboxylic acids by a high-cost multistep process. We present a new high-yielding process for the direct intramolecular dehydration of dicarboxylic acids using a reusable heterogeneous Lewis acid catalyst, Nb2O5·nH2O. Various dicarboxylic acids, which can be produced by a biorefinery process, are transformed into the corresponding cyclic anhydrides as monomers for polyester production. This method is suitable for the production of renewable polyesters in a biorefinery process.
[A336][BDGA] ionic liquid and preparation method therefor
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Paragraph 0031; 0045, (2016/12/01)
The invention relates to [A336][BDGA] ionic liquid and a preparation method therefor and belongs to the field of synthesis of ionic liquid extractants. The preparation method comprises the following steps: (1) adopting isopropanol, sodium metal and methyl trioctyl ammonium chloride as reactants, dissolving the sodium metal in the isopropanol so as to produce sodium isopropoxide, then, subjecting sodium isopropoxide to reaction with methyl trioctyl ammonium chloride, and carrying out hydrolysis, so as to produce methyl trioctyl ammonium hydroxide; (2) adopting diglycolic acid, acetic anhydride and di-n-butylamine as reactants, firstly, dehydrating diglycolic acid so as to obtain diglycolic anhydride, and then, subjecting diglycolic anhydride to reaction with di-n-butylamine, so as to obtain N,N-di-n-butyl acetamido-oxy acetate; and (3) subjecting the quaternary ammonium hydroxide obtained in the step (1) and N,N-di-n-butyl acetamido-oxy acetate obtained in the step (2) to acid/base neutralization reaction, thereby obtaining the [A336][BDGA] ionic liquid product. The preparation method has the characteristics of short production cycle, low cost, high yield and high purity; and meanwhile, the [A336][BDGA] ionic liquid has a good rare-earth extracting and separating effect, thereby having a good market application prospect.
