scholarly journals Preparation of a Novel Polystyrene-Poly(hydroxamic Acid) Copolymer and Its Adsorption Properties for Rare Earth Metal Ions

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1905 ◽  
Author(s):  
Xiaoyan Cao ◽  
Qing Wang ◽  
Shuai Wang ◽  
Ruilin Man
Keyword(s):  
Rare Earth ◽  
Metal Ions ◽  
Surface Area ◽  
Hydroxamic Acid ◽  
Earth Metal ◽  
Rare Metal ◽  
Rare Earth Ions ◽  
Area Measurement ◽  
Bet Surface Area ◽  
Acid Copolymer

In this study, a novel polystyrene-poly(hydroxamic acid) copolymer was synthesized as an effective adsorbent for the treatment of rare earth elements. Through the use of elemental analysis as well as FTIR, SEM, XPS, and Brunauer-Emmett-Teller (BET) surface area measurement, the synthesized polymer was found to have a specific surface area of 111.4 m2·g−1. The adsorption performances of rare metal ions were investigated under different pH levels, contact times, initial concentrations of rare earth ions, and temperatures. The adsorption equilibrium for La3+, Ce3+, and Y3+ onto a polystyrene-poly(hydroxamic acid) copolymer is described by the Langmuir model, which confirms the applicability of monolayer coverage of rare earth ions onto a polystyrene-poly(hydroxamic acid) copolymer. The amount of adsorption capacities for La3+, Ce3+, and Y3+ reached 1.27, 1.53, and 1.83 mmol·g−1 within four hours, respectively. The adsorption process was controlled by liquid film diffusion, particle diffusion, and chemical reaction simultaneously. The thermodynamic parameters, including the change of Gibbs free energy (∆G), the change of enthalpy (∆H), and the change of entropy (∆S), were determined. The results indicate that the adsorption of resins for La3+, Ce3+ and Y3+ was spontaneous and endothermic. The polymer was also used as a recyclable adsorbent by the desorption experiment.

The Difference between Rare Earth Ions and Alkaline Earth Metal Ions in DNA Condensation Process

2011 ◽  
Vol 694 ◽  
pp. 613-615
Author(s):  
Jun Zhang ◽  
Xiao Ting Shi ◽  
Wei Guo ◽  
Zhong Zhang ◽  
Hong Yang
Keyword(s):  
Rare Earth ◽  
Metal Ions ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Dna Condensation ◽  
Rare Earth Ions ◽  
Alkaline Earth Metal ◽  
Condensation Process ◽  
Alkaline Earth Metal Ions ◽  
The Difference

The structural transition of DNA double-stranded induced by Ce3+ or Mg2+ ions was investigated in this paper. By atomic force microscopy, different types of condensed DNA structures were observed at the presence of Ce3+ or Mg2+ ions. The results show that there are some differences between rare earth ions and alkaline earth metal ions in the DNA condensation process.

scholarly journals Adsorption Properties for La(III), Ce(III), and Y(III) with Poly(6-acryloylamino-hexyl hydroxamic acid) Resin

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 3
Author(s):  
Xiaoyan Cao ◽  
Chunjie Zhou ◽  
Shuai Wang ◽  
Ruilin Man
Keyword(s):  
Rare Earth ◽  
Hydroxamic Acid ◽  
Kinetic Studies ◽  
Rare Metal ◽  
Adsorption Properties ◽  
Rare Earth Ions ◽  
Chelating Resin ◽  
Infrared Spectrometry ◽  
Acid Resin ◽  
Pseudo Second Order

Using polyacrylic resin followed by the substitution reaction with 6-aminohexyl hydroxamic acid, poly(6-acryloylamino-hexyl hydroxamic acid) resin (PAMHA) was successfully synthesized. PAMHA, a spherical resin with the particle size of 0.4 mm, is a novel polyamide hydroxamic acid chelating resin containing acylamino and hydroxamic acid functional groups. A series of influences (pH, contact time, temperature, and the initial concentrations of rare earth ions) were investigated to determine the adsorption properties. The adsorption capacity for La(III), Ce(III), and Y(III) ions were 1.030, 0.962, and 1.450 mmol·g−1, respectively. Thermodynamic and kinetic studies were also carried out to show that the uptake of rare earth ions onto PAMHA fitted well the pseudo-second-order model and Langmuir isotherm, and the adsorption process was spontaneous endothermic. In addition, desorption of rare earth ions was achieved by using 2 mol·L−1 HNO3 and desorption efficiencies for La(III), Ce(III), and Y(III) ions were 98.4, 99.1, and 98.8%, respectively. Properties of PAMHA resin were characterized by scanning electron microscope (SEM), Fourier transform infrared spectrometry (FTIR), and X-ray photoelectron spectrometer (XPS). The results showed that there was coordination between the rare earth ions with PAMHA and rare metal ions were chemically adsorbed on the surface of the PAMHA.

Phosphorylated-calix[4]arene double-deckers of single rare earth metal ions

2021 ◽  
Author(s):  
Marjan Hosseinzadeh ◽  
Sergio Sanz ◽  
Jan van Leusen ◽  
Natalya V Izarova ◽  
Euan K Brechin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Metal Ions ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Double Decker ◽  
Organic Framework

Combination of phosphoryl and calix[4]arene moieties in the same organic framework (LPO) directs the formation of homoleptic double-decker complexes [LnIII(LPO)2](O3SCF3)3 for Ln = Tb and Dy, with the latter displaying...

Peptide Hydrogel with Antibacterial Performance Induced by Rare Earth Metal Ions

Langmuir ◽  
2021 ◽  
Author(s):  
Wenlong Xu ◽  
Zhiwen Zhang ◽  
Xin Zhang ◽  
Yuanhan Tang ◽  
Yuzhong Niu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Metal Ions ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Antibacterial Performance ◽  
Peptide Hydrogel
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