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1

Effective Removal of Iron (II) from Aqueous Solution by Adsorption using Zn/Cr Layered Double Hydroxides Intercalated with Keggin Ion

Oktriyanti Melantina, Palapa Neza Rahayu, Mohadi Risfidian, Lesbani Aldes

Journal of Ecological Engineering

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2020

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Vol. 21, nr 5

63--71

EN

Zn/Cr and Zn/Cr layered double hydroxides (LDHs) intercalated with Keggin ion [α-SiW12O40]4-were successfully synthesized at room temperature and pH value of 10. The synthesized materials were characterized by means of the XRD, BET, and FT-IR analyses and used as an adsorbent iron(II). The adsorption process was investigated by studying pH, the kinetics, and thermodynamic properties of the adsorption process. The results showed the interlayer Zn/Cr LDHs was 7.53 Å and increase to 10.26 Å on Zn/Cr LDHs intercalated with Keggin ion [α-SiW12O40]4-. The BET analysis showed that the pore volume of both materials increased from 0.063 cm3 g-1 to 0.163 cm3 g-1. The pH point zero charge measurement for the Zn/Cr LDHs material was 10 while LDHs Zn/Cr intercalated with Keggin ion [α-SiW12O40]4- was 8. Zn/Cr LDHs intercalated with Keggin ion [α-SiW12O40]4- has higher adsorption capacity than Zn/Cr LDHs without intercalation. Desorption of iron (III) was successfully conducted using HCl as reagent showing the involvement of ion exchange in the adsorption.

2

Synthesis, characterization and Magnetic Studies of Oxamido-Bridged Copper(II)-Iron(III) Heterobinuclear Complexes

Li Y., Zhu C., Yan C., Dou J., Wang D.

Polish Journal of Chemistry

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2005

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Vol. 79 / nr 8

1265-1273

EN

Two new oxamido-bridged Cu(II)-Fe(III) heterobinuclear complexes of formulae [Cu(dmoxpn)Fe(bpy)2](ClO4)3 (1) and [Cu(dmoxae)Fe(bpy)2](ClO4)3 (2) have been synthesized, where bpy denotes 2,2_-bipyridine; while dmoxpn and dmoxae represent N,N_-bis[3-(dimethylamino)propyl]oxamido and N,N_-bis[2-(dimethylamino) ethyl]oxamido dianions, respectively. Based on elemental analyses, molar conductivity measurements, IR and electronic spectral studies, it is proposed that the two complexes have oxamido-bridged structures consisting of a copper(II) and an iron(III) ions, which have a square planar environment and a distorted octahedral environment, respectively. The two heterobinuclear complexes were further characterized by variable-temperature magnetic susceptibility (4.2~300 K) measurements and the observed data were simulated by the equation based on the spin Hamiltonian operator, H = JS S 1 2 2 , giving the exchange integral J = -18.2 cm-1 for (1) and J = -26.5 cm-1 for (2). The results revealed the occurrence of an intramolecular antiferromagnetic interaction between the adjacent iron(III) and copper(II) ions through the oxamido- -bridge within each molecule. The influence of the chelate ring arrangement around the copper( II) in the copper(II)-iron(III) heterobinuclear complexes on magnetic interactions between the metal ions of this kind of complexes is preliminarily discussed.

3

Synthesis and Magnetic Analysis of mi Oxamido-Bridged Cu(II)-Fe(II) Heterodinuclear Complexes

Li Y., Zhang G., Yan C., Dou J., Wang D.

Polish Journal of Chemistry

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2005

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Vol. 79 / nr 9

1405-1413

EN

The strategy of "complex as ligand" allowed us to synthesize two new mi-oxamido- bridged heterodinuclear complexes identified as [Cu(bmap)Fe(bpy)2]SO4 (1) and [Cu(bmap)Fe(phen)2]SO4 (2), where bmap represents the N,N'-bis(2-methyl-2-aminopropyl) oxamido dianion; bpy and phen stand for 2,2'-bipyridine and 1,10-phenanthroline, respectively. These complexes are the first examples of copper(II)-iron(II) species bridged by bmap groups. Based on elemental analyses, IR and electronic spectra studies, magnetic moments at room temperature and molar conductivity measurements, these complexes are proposed to have an extended oxamido-bridged structure consisting of planar copper(II) and octahedral iron(II) ions. The two heterodinuclear complexes have been further characterized by variable temperature magnetic susceptibility (4.2-300 K) and the observed data were least-squares fitted to the susceptibility equation derived from the spin Hamiltonian including single-ion zero-field interaction for the iron(II) ion,H=-2JS1 . S2-DS2 Z1 , giving the exchange integrals J = -18.9 cm-1 for (1) and J = -20.1 cm-1 for(2). These results indicated that the spin coupling between the adjacent copper(II) and iron(II) ions through the oxamido-bridge in both complexes (1) and (2) is antiferromagnetic. The influence of methyl substituents in the bridging ligand on magnetic interactions between the metal ions of this kind of complexes is also discussed

4

Synthesis, Characterization and Magnetism of Fe(II)-Pd(II0-Fe(II) Heterotrinuclear Complexes Bridged by Dioximato Groups

Li Y., Yan C. -W., Zeng X.-C.

Polish Journal of Chemistry

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2002

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Vol. 76 / nr 5

645-652

EN

Three new Fe(II)-Pd(II)-Fe(II) heterotrinuclear complexes with dioximato-bridge have been synthesized and identified as [Fe2Pd(_-FD)2(Me2-bpy)4]SO4 (1), [Fe2Pd(_-FD)2(Me2-phen)4]SO4 (2) and [Fe2Pd(_-FD)2(Me-phen)4]SO4 (3); where (_-FD)2_ represents _-furildioximato; Me2-bpy, Me2-phen and Me-phen denote 4,4_-dimethyl-2,2_-bipyridine; 2,9-dimethyl-1,10-phenanthroline (Me2-phen) and 5-methyl-1,10-phenanthroline (Me-phen). Based on elemental analyses, molar conductance measurements, IR and electronic spectral studies, these complexes are proposed to have extended dioximato-bridged structures and to consist of two iron(II) ions and a palladium(II) ion, in which the central palladium(II) ion has a square-planar environment and the end capped two iron(II) ions have a distorted octahedral environment. The magnetic properties of complexes [Fe2Pd(_-FD)2(Me2-bpy)4]SO4 (1) and [Fe2Pd(_-FD)2(Me2-phen)4]SO4 (2) were investigated over the 4.2~300Krange and correspond to what is expected for an antiferromagnetic Fe(II)-Fe(II) pair with SFe(II) = 2 and SPd(II) = 0 (Pd2+ is a diamagnetic in a square-planar environment) local spins. The exchange integral (J) was evaluated as J = _2.89 for (1) and J = _3.16 for (2) based on the spin Hamiltonian operator, _ _ _ H = JS S 1 2 _ _ 2 .

5

Extraction of zinc(II), iron(III) and iron(II) with binary mixtures containing tributyl phosphate and di(2-ethylhexyl)phosphoric acid or CYANEX 302

Bartkowska M., Regel-Rosocka M., Szymanowski J.

Physicochemical Problems of Mineral Processing

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2002

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Vol. 36

217-224

EN

The extraction of zinc(II), iron(III) and iron(II) with TBP and its binary mixtures with DEHPA and CYANEX 302 from hydrochloric acid solutions was studied. It was found that the extraction ability of zinc(II) chlorocomplexes from hydrochloric acid solutions decreased in the order: TBP > TBP:HL=3:1 vol/vol > TBP:HL=1:1 vol/vol. Iron(III) was strongly extracted by TBP and its binary mixtures with DEHPA and CYANEX 302, and the extraction fell in the order: binary mixtures with DEHPA or CYANEX 302> TBP> DEHPA >> CYANEX 302. Iron(II) was not extracted by the considered extractants. Zinc(II) could not be selectively extracted in the presence of iron(III). Contrary, iron(III) could be selectively extracted, especially with the binary 1:1 vol/vol mixtures of TBP with DEHPA or CYANEX 302. The stripping of zinc(II) could be accomplished in three successive stages using water and 0.1 M H2SO4. Iron(III) could be stripped in three stages with 0.1 M H2SO4.

PL

Badano ekstrakcję cynku(II), żelaza(III) oraz żelaza(II) za pomocą fosforanu tributylu (TBP) i jego mieszanin dwuskładnikowych z kwasem di(2-etyloheksylo)fosforowym (DEHPA) oraz tlenkiem trialkilofosfiny (CYANEX 302) z roztworów kwasu solnego. W wyniku przeprowadzonych badań stwierdzono, że zdolność ekstrakcji chlorokompleksów cynku z roztworów kwasu solnego maleje w następującej kolejności: TBP > TBP:HL=3:1 vol/vol > TBP:HL=1:1 vol/vol. Żelazo(III) jest silnie ekstrahowane przez TBP i jego mieszaniny dwuskładnikowe z DEHPA i CYANEX 302. Zdolność ekstrakcyjna maleje w kolejności: mieszaniny dwuskładnikowe TBP:DEHPA lub TBP:CYANEX 302> TBP> DEHPA >> CYANEX 302. Żelazo(II) nie jest ekstrahowane przez badane reagenty organiczne.Cynku(II) nie można selektywnie wyekstrahować w obecności żelaza(III). Natomiast żelazo(III) można wyekstrahować przy użyciu mieszaniny dwuskładnikowej TBP:DEHPA=1:1 vol/vol lub TBP:CYANEX 302=1:1 vol/vol.Przebadano również reekstrakcję cynku(II) i żelaza(III) z naładowanej fazy organicznej TBP:DEHPA = 3:1 vol/vol. Uzyskane wyniki wskazują na to, że cynk można całkowicie wydzielić prowadząc trzystopniową reekstrakcję w pierwszym etapie wodą, a następnie 0.1 M H2SO4. Najskuteczniej można zreekstrahować żelazo(III) za pomocą trzystopniowej reekstrakcji 0.1 M H2SO4.

6

Synthesis and magnetism of heterobinuclear Cu(II)-Fe(II) complexes bridges by N,N'-bis(3-aminopropyl)oxamidocopper(II)

Li Y.T., Yan C.W., Zhu X.D., Liao D.Z.

Polish Journal of Chemistry

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1998

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Vol. 72, nr 3

485-491

EN

Four new my-oxamido heterobinuclear complexes have been synthesized and characterized, namely[Cu(oxpn)Fe(L)2]SO4, here oxpn denotes the N,N'-bis(3-aminopropyl)oxamido dianion and L represents 1,10-phenanthroline (phen); 5-nitro-1,10-phenanthroline (NO2-phen); 5-chloro-1,10-phenanthroline (Cl-phen) and 2,2'-bipyridine (bpy). Based on the elemental analyses, spectroscopic studies, magnetic moments (at room temperature) and molar conductivity measurements, extended oxamido-bridged structures consisting of a copper(II) and an iron(II) ions, which have a square planar environment and an octahedral environment, respectively, are proposed for these complexes. The [Cu(oxpn)Fe(bpy)2]SO4 (1) and [Cu(oxpn)Fe(phen)2]SO4 (2) complexes have been characterized by variale temperature magnetic susceptibility (4.2-300K) and the observed data were least-squares fitted to the susceptibility equation derived from the spin Hamiltonian including single-ion zero-field interaction for the iron (II) oion, H=-2J S(1)xS(2) - DS(z), giving the exchange integrals J=-21.8 cm(-1) for (1) and J=-23.2 cm(-1) for (2). These results are commensurate with antiferromagnetic interactions between adjacent metal ions within each molecule.