Ligand exchange sorption of arsenate and arsenite anions by chelating resins in ferric ion form I. Weak-base chelating resin dow XFS-4195

A Fe(III)-loaded chelating resin named Fe(III) AO PAN was prepared by immobilizing Fe(III) onto porous amidoximated polyacrylonitrile (AO PAN) obtained by modification of hydroxylamine with polyacrylonitrile (PAN), which was synthesized by suspended emulsion polymerization. The structures of PAN, AO PAN, and Fe(III)-AO PAN were characterized by infrared spectrometry and scanning electron microscopy. The performance of Fe(III)-AO PAN as the ligand exchange adsorbent to remove As(V) from aqueous solution was investigated using static equilibrium and dynamic adsorption experiments. The adsorption experiments showed that Fe(III)-AO PAN had higher adsorption selectivity for As(V) than other ubiquitous anions in nature water body such as Cl−, SO42−, HCO3−, PO43−, and SiO32−. The optimal pH for adsorption of As(V) on Fe(III) AO PAN was 2.0, with the maximum adsorption capacity of 0.55 mg/g. The As(V) adsorbed on Fe(III) AO PAN could be easily eluted with 10 BV of 5% NaCl solution (at pH = 9.0).

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Ligand Induced Spin Crossover in Penta-Coordinated Ferric Dithioearbamates

Zeitschrift für Naturforschung A ◽

10.1515/zna-1981-0917 ◽

1981 ◽

Vol 36 (9) ◽

pp. 1016-1018

Author(s):

P. Ganguli ◽

R. M. Iyer

Keyword(s):

Chemical Equilibrium ◽

Ligand Exchange ◽

Spin Crossover ◽

Ferric Ion ◽

Lewis Bases ◽

Slow Decomposition

Abstract On addition of lewis bases to Fe(dtc)2X, ligand exchange takes place through a SN2 mechanism, with a parallel spin crossover in the ferric ion. The two species (S = 3/2 and S = 5/2) formed are in dynamic chemical equilibrium, and a slow decomposition is then initiated.

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Chromatographic Selectivity of Rare Earth Elements on Iminodiacetate-Type Chelating Resins Having Spacer Arms of Different Lengths: Importance of Steric Flexibility of Functional Group in a Polymer Chelating Resin

Analytical Chemistry ◽

10.1021/ac980334v ◽

1998 ◽

Vol 70 (19) ◽

pp. 4070-4073 ◽

Cited By ~ 24

Author(s):

Hiroki Kumagai ◽

Yoshinori Inoue ◽

Toshiro Yokoyama ◽

Toshishige M. Suzuki ◽

Takashi Suzuki

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Functional Group ◽

Chelating Resin ◽

Chelating Resins

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Iron(III)-Chelating Resins. IX. Antibacterial Activity of a Water-Insoluble Iron(III)-Chelating Resin

Journal of Medicinal Chemistry ◽

10.1021/jm00033a009 ◽

1994 ◽

Vol 37 (7) ◽

pp. 924-927 ◽

Cited By ~ 5

Author(s):

Minhua Feng ◽

Leen van der Does ◽

Adriaan Bantjes

Keyword(s):

Antibacterial Activity ◽

Chelating Resin ◽

Chelating Resins

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Selective Chelating Resin for Copper Removal and Recovery in Aqueous Acidic Solution Generated from Synthetic Copper-Citrate Complexes from Bioleaching of E-waste

Adsorption Science & Technology ◽

10.1155/2022/5009124 ◽

2022 ◽

Vol 2022 ◽

pp. 1-14

Author(s):

Kowit Suwannahong ◽

Jiyapa Sripirom ◽

Chadrudee Sirilamduan ◽

Vanlop Thathong ◽

Torpong Kreetachart ◽

...

Keyword(s):

Acidic Solution ◽

Exchange Process ◽

Ammonium Hydroxide ◽

Chelating Resin ◽

Copper Removal ◽

Basic Solution ◽

Chelating Resins ◽

Chelex 100 ◽

Aqueous Acidic Solution ◽

Desorption Capacity

This research focused on batch experiment using a new generation of chelating resins via an ion exchange process to describe the metabolic adsorption and desorption capacity onto iminodiacetic acid/Chelex 100, bis-pyridylmethyl amine/Dowex m4195, and aminomethyl phosphonic/Lewatit TP260 functional groups in bioleaching. The results showed that Dowex m4195 had the highest performance of adsorption capacity for copper removal in both H+-form and Na+-form. Results for Lewatit TP260 and Chelex 100 revealed lower adsorption performance than results for Dowex m4195. The investigation of desorption from chelating resins was carried out, and it was found that 2 M ammonium hydroxide concentration provided the best desorption capacity of about 64.86% for the H+-form Dowex m4195 followed by 52.55% with 2 M sulfuric acid. Lewatit with 2 M hydrochloric acid gave the best desorption performance in Na+-form while Chelex 100 using hydrochloric at 1 M and 2 M provided similar results in terms of the H+-form and Na+-form. As aspects of the selective chelating resins for copper (II) ions in aqueous acidic solution generated from synthetic copper-citrate complexes from bioleaching of e-waste were considered, H+-form Dowex m4195 was a good performer in adsorption using ammonium hydroxide for the desorption. However, chelating resins used were subsequently reused for more than five cycles with an acidic and basic solution. It can be concluded from these results that selective chelating resins could be used as an alternative for the treatment of copper (II) ions contained in e-waste or application to other divalent metals in wastewater for sustainable water and adsorbent reuse as circular economy.

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A comparative study of Schiff base chelating resins: synthesis, uptake of heavy metal ions, and thermal studies

Eclética Química Journal ◽

10.26850/1678-4618eqj.v43.2.2018.p10-22 ◽

2018 ◽

Vol 43 (2) ◽

pp. 10 ◽

Cited By ~ 1

Author(s):

Fatma A. Al-Yusufy ◽

Mohammed Q. Al-Qadasy ◽

Yasmin M. S. Jamil ◽

Hussein M. Al-Maydama ◽

Moathe M. Akeel

Keyword(s):

Reaction Time ◽

Metal Ions ◽

Condensation Reaction ◽

Thermal Analyses ◽

Thermal Studies ◽

Ion Concentration ◽

Chelating Resin ◽

Cross Linking ◽

Free Radical Copolymerization ◽

Chelating Resins

Two new chelating resins (Rciaa91 and Rciaa73) with different compositional chelating groups and degree of cross-linking were prepared by free radical copolymerization of Schiff bases obtained from condensation reaction of cinnamaldehyde (ci) with anthranilic acid (aa) and 1,4-phenylenediamine (pn) monomers. The synthesized materials were characterized using CHN analyses, FTIR, 1H-NMR, and thermal analyses (TGA, DTA). Batch technique was applied, and the contact time, pH and initial concentration of the metal ions were investigated as factors affecting the uptake behavior. The results obtained indicated that the chelating resin with larger compositional ratio of chelating moieties and lower degree of cross-linking showed lower optimum reaction time and higher uptake affinity towards the metal ions Cu(II), Cd(II), Co(II), Zn(II), Hg(II), and Pb(II), under the same conditions. Both the chelating resins showed uptake behavior of the metal ions in the following order Hg2+ > Cu2+ > Zn2+>Pb2+>Co2+ > Cd2+ each metal at its optimum pH and at the same reaction time and ion concentration. The thermal degradation behavior and stability of the resins were investigated by using non-isothermal thermogravimetric analysis (TGA/DTG/DTA), at 10 °C min-1 heating rate and under nitrogen. The Coats-Redfern method was used to evaluate the kinetic and thermodynamic parameters (ΔG*, ΔH* and ΔS*) for the prominent degradation steps in the TGA curves at 450-660 °C range.

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