New sulfur-containing polymeric sorbents based on 2,2′-thiobisethanol dimethacrylate

2019 ◽  
Vol 91 (3) ◽  
pp. 409-420 ◽  
Author(s):  
Sylwia Ronka
Keyword(s):  
Metal Ions ◽  
Methylene Chloride ◽  
Suspension Polymerization ◽  
Polymer Chains ◽  
Synthesis Conditions ◽  
Polymeric Sorbents ◽  
Sorption Ability ◽  
Donor Acceptor ◽  
Precious Metal Ions ◽  
Selection Of

Abstract The first step in obtaining of a specific polymer sorbent containing sulfur atoms was the synthesis of a functional monomer – 2,2′-thiobisethanol dimethacrylate (TEDM). Synthesis consists of the reaction of 2,2′-thiobisethanol with methacryloyl chloride in the presence of triethylamine in methylene chloride. The new poly(dimethacrylate)s materials containing sulfur atoms were synthesized in radical suspension polymerization. Homopolymerization of 2,2′-thiobisethanol dimethacrylate and its copolymerization with ethylene glycol dimethacrylate or pentaerythritol tetraacrylate were carried out. The selection of synthesis conditions determines the parameters of the polymer structure and its properties. The presence of sulfur atoms in polymer chains resulted in specific donor-acceptor interactions, which can intensify sorption ability towards metal ions belonging to the group of soft acids. Therefore, the sorption properties of the obtained materials have been determined based on the recovery of precious metal ions, such as gold(III) and silver(I).

scholarly journals Poly (Amidehydrazide) Hydrogel Particles for Removal of Cu2+ and Cd2+ Ions from Water

Gels ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 121
Author(s):  
Hojung Choi ◽  
Taehyoung Kim ◽  
Sang Youl Kim
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Suspension Polymerization ◽  
Polymerization Process ◽  
New Class ◽  
Hydrogel Particles ◽  
Ion Sorption ◽  
Hyperbranched Poly ◽  
Sorption Ability

Poly(amidoamine)s (PAMAM) are very effective in the removal of heavy metal ions from water due to their abundant amine and amide functional groups, which have a high binding ability to heavy metal ions. We synthesized a new class of hyperbranched poly(amidehydrazide) (PAMH) hydrogel particles from dihydrazides and N,N′-methylenebisacrylamide (MBA) monomer by using the A2 + B4 polycondensation reaction in an inverse suspension polymerization process. In Cd2+ and Cu2+ ion sorption tests, the synthesized dihydrazide-based PAMH hydrogel particles exhibited sorption capacities of 85 mg/g for copper and 47 mg/g for cadmium. Interestingly, the PAMH showed only a 10% decrease in sorption ability in an acidic condition (pH = 4) compared to the diamine-based hyperbranched PAMAM, which showed a ~90% decrease in sorption ability at pH of 4. In addition, PAMH hydrogel particles remove trace amounts of copper (0.67 ppm) and cadmium (0.5 ppm) in water, below the detection limit.

scholarly journals Composite Biosorbents of Metal Ions Based on Yeast Cells and Diatomite

2013 ◽  
Vol 15 (3) ◽  
pp. 233 ◽  
Author(s):  
K.B. Korzhynbayeva ◽  
S.M. Tazhibayeva ◽  
K.B. Musabekov ◽  
I. Dekany ◽  
M.M. Burkitbaev ◽  
...  
Keyword(s):  
Metal Ions ◽  
Electrostatic Interactions ◽  
Rhodotorula Glutinis ◽  
Yeast Cells ◽  
Charged Surface ◽  
Amino Groups ◽  
Sorption Ability ◽  
Donor Acceptor ◽  
Removal Of Metal ◽  
Removal Of Metal Ions

<p>The possibility of removing Cu<sup>2+</sup> and Pb<sup>2+</sup> ions from solutions by the yeast cells <em>Rhodotorula glutinis</em> and diatomite (natural mineral) was studied. It is shown that at the concentration of CuSO<sub>4</sub> and Pb(NO<sub>3</sub>)<sub>2</sub> 10<sup>-3</sup> mol/l the removal of metal ions by yeast cells was 59.1 and 72.4% for the ions of Cu<sup>2+</sup> and Pb<sup>2+</sup>. The yeast cells surface includes amino, hydroxyl, phosphate and carboxyl groups which activates sorption ability, because these groups can bind metal ions by ion exchange, donor acceptor and electrostatic interactions. The removal degree of metal ions by diatomite under the same conditions was for Cu<sup>2+</sup> 91.6% and for Pb<sup>2+</sup> 94.7%. To increase the removal degree of metal ions from solutions, the yeast cells were immobilized on the surface of diatomite. In order to attach the negatively charged cells of microorganisms with negatively charged surface of the mineral, the surface of diatomite was modified by polyethylenimine (PEI). As a result, the immobilization degree of <em>Rhodotorula glutinis</em> to the surface of diatomite at the concentration of PEI 0.02 base-mol/l increased from 62 to 88%, which is explained by the existence of electrostatic contacts between the negatively charged functional groups of the cell surface and amino groups of PEI, that has covered the surface of diatomite by PEI. It is shown that the obtained composite biosorbent removes 97.8% of Cu<sup>2+</sup> ions and 99.4% of Pb<sup>2+</sup> ions.</p>

scholarly journals Influence of synthesis conditions on molecular weight as well as mechanical and thermal properties of poly(hexamethylene 2,5-furanate)

Polimery ◽  
2021 ◽  
Vol 66 (10) ◽  
Author(s):  
Sandra Paszkiewicz ◽  
Izabela Irska ◽  
Konrad Walkowiak ◽  
Agata Zubkiewicz
Keyword(s):  
Molecular Weight ◽  
Thermal Properties ◽  
Phase Changes ◽  
Polymer Chains ◽  
Synthesis Process ◽  
Mechanical And Thermal Properties ◽  
Synthesis Conditions ◽  
Melt Polycondensation ◽  
The Relationship ◽  
Selection Of

Poly(hexamethylene 2,5-furanate) (PHF) was obtained by melt polycondensation. The process was carried out at temperatures of 230, 235 and 240 ° C. It has been shown that the selection of the optimal parameters of the synthesis process leads to the obtaining of  biomaterials of high molecular weight, and thus better mechanical and thermal properties. The relationship between the molecular weight and the mobility of polymer chains, and consequently the temperature of phase changes and mechanical properties, was determined.

Accelerating the optimization of enzyme-catalyzed synthesis conditions via machine learning and reactivity descriptors

2021 ◽  
Author(s):  
Zhongyu Wan ◽  
Quan-De Wang ◽  
Dongchang Liu ◽  
Jinhu Liang
Keyword(s):  
Machine Learning ◽  
Optimal Synthesis ◽  
Human Knowledge ◽  
Crucial Importance ◽  
Reactivity Descriptors ◽  
Synthesis Conditions ◽  
Wide Range ◽  
Synthesis Reactions ◽  
Selection Of

Enzyme-catalyzed synthesis reactions are of crucial importance for a wide range of applications. An accurate and rapid selection of optimal synthesis conditions is crucial and challenging for both human knowledge...

scholarly journals Isotypic one-dimensional coordination polymers:catena-poly[[dichloridocadmium]-μ-5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylato-κ2N5:N6] andcatena-poly[[dichloridomercury(II)]-μ-5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylato-κ2N5:N6]

2016 ◽  
Vol 72 (8) ◽  
pp. 1214-1218 ◽  
Author(s):  
Montserrat Alfonso ◽  
Helen Stoeckli-Evans
Keyword(s):  
Hydrogen Bonds ◽  
Metal Ions ◽  
Coordination Polymers ◽  
Rotation Axis ◽  
Dimethyl Ester ◽  
Polymer Chains ◽  
Coordination Geometry ◽  
One Dimensional ◽  
The Difference ◽  
Title One

The isotypic title one-dimensional coordination polymers, [CdCl2(C18H14N4O4)]n, (I), and [HgCl2(C18H14N4O4)]n, (II), are, respectively, the cadmium(II) and mercury(II) complexes of the dimethyl ester of 5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylic acid. In both compounds, the metal ions are located on a twofold rotation axis and a second such axis bisects the Car—Carbonds of the pyrazine ring. The metal ions are bridged by binding to the N atoms of the two pyridine rings and have anMN2Cl2bisphenoidal coordination geometry. The metal–Npyrazinedistances are much longer than the metal–Npyridinedistances; the difference is 0.389 (2) Å for the Cd—N bonds but only 0.286 (5) Å for the Hg—N bond lengths. In the crystals of both compounds, the polymer chains are linkedviapairs of C—H...Cl hydrogen bonds, forming corrugated slabs parallel to theacplane.

Enhanced water stability and high CO2 storage capacity of Lewis basic sites containing zirconium metal–organic framework

2021 ◽  
Author(s):  
Selcuk Demir ◽  
Nuray Bilgin ◽  
H. Merve Cepni ◽  
Hiroyasu Furukawa ◽  
Fatih Yilmaz ◽  
...  
Keyword(s):  
Metal Ions ◽  
Storage Capacity ◽  
Metal Organic Framework ◽  
Co2 Storage ◽  
Metal Organic Frameworks ◽  
Water Stability ◽  
High Co2 ◽  
Metal Organic ◽  
Zirconium Metal ◽  
Selection Of

Metal–organic frameworks (MOFs) are an emerging class of materials employed for custom-designed purposes by judicious selection of the linker and the metal ions. Among the MOFs composed of carboxylate linkers,...

Donor-acceptor Stenhouse Adducts with Three Orthogonally Controlled Intrisic Stationary States

2020 ◽  
Author(s):  
Yongli Duan ◽  
Haiquan Zhao ◽  
GuoDong Xue ◽  
Ze Wang ◽  
Chaoyue Xiong ◽  
...  
Keyword(s):  
Crown Ether ◽  
Metal Ions ◽  
Smart Materials ◽  
Green Light ◽  
Supramolecular Structures ◽  
The Other ◽  
Van Der Waals Interactions ◽  
Stationary States ◽  
Complex Stimuli ◽  
Donor Acceptor

Abstract Photoresponsive molecules with more than two intrinsic stationary states are very Interesting. Here, we demonstrate a series of crown ether (CE) substituted donor-acceptor Stenhouse adducts (DASAs) that can be switched between three stationary states under orthogonal control of light and metal ions. DASA-CE molecules are self-assembled into 1:1 head-to-tail supramolecular structures to form di-linear states due to strong van der Waals interactions between electron-donating and -withdrawing moieties. Furthermore, treatment with metal ions (Na+ or K+) switches the di-linear back to the linear state, which is reversible after adding free crown ether. On the other hand, green light irradiation induces linear-to-cyclic isomerization of DASA-CE, while the photoisomerization from di-linear to cyclic state is inhibited. The reverse cyclic-to-linear isomerization can occur under heating in the dark. All in all, the orthogonal switching of DASA-CE between di-linear, linear and cyclic states enables the development of smart materials in environments with complex stimuli.

scholarly journals Copper Ions Removal from Water using A2B3 Type Hyperbranched Poly(amidoamine) Hydrogel Particles

Molecules ◽  
2019 ◽  
Vol 24 (21) ◽  
pp. 3866
Author(s):  
Hojung Choi ◽  
Youngsik Eom ◽  
Sanghwa Lee ◽  
Sang Youl Kim
Keyword(s):  
Metal Ion ◽  
Copper Ions ◽  
Suspension Polymerization ◽  
Spherical Shape ◽  
Synthetic Process ◽  
Metal Ion Removal ◽  
Hyperbranched Poly ◽  
Sorption Ability ◽  
Heavy Metal Ion Removal ◽  
High Sorption

Micrometer-sized hyperbranched poly(amidoamine) (hPAMAM) particles are prepared with a simple A2B3 type Aza–Michael addition reaction between aminoethylpiperazine (AEP) and methylenebisacrylamide (MBA) in an inverse suspension polymerization condition. The synthesized particles exhibited surprisingly high Cu2+ sorption capacity (0.223g/g) for a solid-type absorbent. In addition to the high sorption ability of the particle, its simple synthetic process and convenience, due to its micrometer-sized spherical shape and recyclability, make it a practical and attractive absorbent for heavy metal ion removal from aqueous solutions.

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