Study of molybdate ion sorption on chitosan gel beads by different spectrometric analyses

Guibal, Eric; Milot, Céline; Eterradossi, Olivier; Gauffier, C.; Domard, Alain

doi:10.1016/s0141-8130(98)00067-1

Cited by 120 publications

(59 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The sharp peak at 896 cm −1 is attributed to the Mo=O bonds, which is a characteristic for the symmetric and asymmetric stretches of the MoO cis-dioxo group [38,[40][41][42]. The very week band at 962 cm −1 is assigned to the stretching vibrations of bonds of Mo-O-Mo group [43][44][45][46] as well as to the vibrations of the double bond of the Mo=O group [41]. This band can also suggest the presence of molybdenum in the lower oxidation state, that is, Mo 5+ [39,40] but in the studied compound, it is impossible due to stoichiometry.…”

Section: Resultsmentioning

confidence: 99%

The Novel Polymorphic Form of Bis(3,5,7-triaza-1-azoniatricyclo[3.3.1.13,7]decane) bis(μ4
Kruszyński
¹
,
Sierański
²
,
Lewinski
³

et al. 2012
International Journal of Inorganic Chemistry
0
0
0
0
View full text Add to dashboard Cite

The reaction of molybdophosphoric acid with zinc carbonate followed by addition of hmta leads to formation of a triclinic polymorph of bis (3,5,7-triaza-1-azoniatricyclo[3.3.1.1 3,7 ]decane) bis(μ 4 -oxo)-tris(μ 3 -oxo)-nonakis(μ 2 -oxo)-nonaaqua-decaoxohepta-molybdenum-di-zinc(II) dihydrate in a one pot simple reaction. The obtained compound has been characterised by IR, UV-Vis spectroscopy, elemental analysis, and X-ray crystallography. A detailed comparison between both polymorphic forms: triclinic a = 22.758Å, b = 24.702Å, c = 31.995Å, α = 101.206• , β = 103.256• , and V = 16203.8Å 3 and monoclinic a = 43.120Å, b = 12.399Å, c = 16.285Å, α = 90.00• , β = 111.12 • , γ = 90.00• , and V = 8122Å 3 was performed. The influence of the synthesis procedure on polymorph formation was described.

show abstract

Section: Resultsmentioning

confidence: 99%

The Novel Polymorphic Form of Bis(3,5,7-triaza-1-azoniatricyclo[3.3.1.13,7]decane) bis(μ4
Kruszyński
¹
,
Sierański
²
,
Lewinski
³

et al. 2012
International Journal of Inorganic Chemistry
0
0
0
0
View full text Add to dashboard Cite

show abstract

“…For the 13 C NMR spectra, we referred to experimental results of (-D-glucose, -D-glucose, and -D-glucosamine), [8][9][10] cellobiose, 11 cellulose, 11 and chitosan. 12 …”

Section: Methodsmentioning

confidence: 99%

Analysis of 13C NMR Chemical Shielding and XPS for Cellulose and Chitosan by DFT Calculations Using the Model Molecules

Danielache

Mizuno

Shimada

et al. 2005

Polym J

View full text Add to dashboard Cite

ABSTRACT:13 C NMR chemical shielding and XPS of cellulose and chitosan were analyzed by deMon DFT calculations using the model dimers. The calculated 13 C chemical shifts of (-D-glucose, -D-glucose, and -D-glucosamine) and cellobiose with DZVP basis are in considerably good accordance with the experimental values in the average absolute deviations (AAD) of AE3:1 and 2.0 ppm, respectively. The calculated shifts of the dimer models for cellulose and chitosan also correspond well to the experimental ones of both solid biopolymers in the AAD of AE3:1 ppm. In order to simulate the valence XPS and to calculate core-electron binding energies (CEBE)s of cellulose and chitosan, we used the restricted diffuse ionization (rDI) and generalized transition-state (GTS) methods, respectively, due to Slater's transition-state (TS) concept. The simulated valence spectra of the dimer models showed good agreement with the experimental ones of cellulose and chitosan. We also estimated as 5.9 and 5.7 eV for WD (work function and the other energies) values of cellulose and chitosan, respectively from the differences between calculated CEBE values for the model molecules and experimental ones on the solid polymers. [DOI 10.1295/polymj.37.21] KEY WORDS 13 C NMR Chemical Shielding / X-ray Photoelectron Spectra / DFT Calculations / Saccharide / Amino-Sugar / It is well-known that cellulose is one of the most abundant natural polymers which has the biological functions of providing cells with mechanical strength and framework. One found cellulose many important applications in areas such as food, drug-delivery systems, and in textile and pulping-paper industries. The elucidation of the structural and dynamic properties of cellulose is, therefore, fundamental to understanding its role in plant cell walls and its functionality in applications. On the other hand, chitosan is especially known as a most powerful adsorbent of natural origin and widely used for the prevention of water pollution by highly toxic chlorinated aromatic compounds and metal ions.1 It is easily prepared from chitin by deacetylating its acetoamide groups with a strong alkaline solution. Chitosan is inexpensive, environmentally benign, harmless to humans, and a hugely obtainable biomass, and makes it very promising and attracting for use in many applications. As so far as we know, no one currently still demonstrates the fundamental studies on the electronic state of the two biopolymers (cellulose and chitosan) from both experimental and theoretical viewpoints.Studies of NMR and XPS properties in organic compounds contain a lot of valuable information concerning the nature of chemical bonds. The former studies of magnetic properties provide information about the roles of angular momentum of electrons in the chemical bonds. The latter XPS gives precise information on the electronic states involving the individual functional group of organic compounds. In our previous studies on 13 C NMR and XPS of organic compounds, 2-6 we performed the better assignments for 13 C NMR sign...

show abstract

“…There are many other small bands in the range of 1600 to 1300 cm -1 . A second band near 1575 cm -1 corresponds to free amine form of glucosamine residues [3,4,13]. A few smaller bands corresponding to the amide II band were detected near 1560-1520 cm -1 .…”

Section: Salt Spray Exposure Testingmentioning

confidence: 96%

“…The chitosan spectrum shows a band at 1640 cm -1 , which corresponds to the overlap of an amide I band due to the residual acetylated residues and -OH bands corresponding to the pyranose structure [13]. There are many other small bands in the range of 1600 to 1300 cm -1 .…”

Section: Salt Spray Exposure Testingmentioning

confidence: 99%

Development and Characterization of Corrosion Resistant Coatings Using the Natural Biopolymer Chitosan

Kumar¹,

Buchheit²

2006

ECS Trans.

View full text Add to dashboard Cite

In the present study, chitosan, a derivative of naturally abundant biopolymer chitin, was used as the basis for corrosion resistant coating. Chitosan suffers from two inherent weaknesses as a coating material namely its high hydrophilicity and its poor adhesive strength with Al 2024 T3 alloy. In the present study, chitosan structure was modified using epoxy functional silane and vanadate. Performance of different coatings was tested using electrochemical impedance spectroscopy, adhesion testing and salt spray testing. The best salt spray performance was observed in case of chitosan-(3-Glycidoxypropyl)-trimethoxysilanevanadate coatings, which lasted 450 hours in salt spray chamber without visible corrosion. UV/Visible spectroscopy measurements showed release of vanadate by chitosan increases with increasing solution pH. This property of chitosan provides self-healing characteristics to these coatings. When the solution pH is readjusted to a lower value, chitosan can readsorb released vanadate. FTIR spectra of chitosan gel showed adsorption of vanadate at protonated amine sites. Chitosan showed a maximum in the vanadate adsorption capacity in the pH 3 to 5 range.

show abstract

Study of molybdate ion sorption on chitosan gel beads by different spectrometric analyses

Cited by 120 publications

References 34 publications

The Novel Polymorphic Form of Bis(3,5,7-triaza-1-azoniatricyclo[3.3.1.13,7]decane) bis(μ4
Kruszyński
¹
,
Sierański
²
,
Lewinski
³

et al. 2012
International Journal of Inorganic Chemistry
0
0
0
0
View full text Add to dashboard Cite

The Novel Polymorphic Form of Bis(3,5,7-triaza-1-azoniatricyclo[3.3.1.13,7]decane) bis(μ4
Kruszyński
¹
,
Sierański
²
,
Lewinski
³

et al. 2012
International Journal of Inorganic Chemistry
0
0
0
0
View full text Add to dashboard Cite

Analysis of 13C NMR Chemical Shielding and XPS for Cellulose and Chitosan by DFT Calculations Using the Model Molecules

Development and Characterization of Corrosion Resistant Coatings Using the Natural Biopolymer Chitosan

Contact Info

Product

Resources

About

Study of molybdate ion sorption on chitosan gel beads by different spectrometric analyses

Cited by 120 publications

References 34 publications

The Novel Polymorphic Form of Bis(3,5,7-triaza-1-azoniatricyclo[3.3.1.13,7]decane) bis(μ4Kruszyński1, Sierański2, Lewinski3 et al. 2012International Journal of Inorganic Chemistry0000View full textAdd to dashboardCite

The Novel Polymorphic Form of Bis(3,5,7-triaza-1-azoniatricyclo[3.3.1.13,7]decane) bis(μ4Kruszyński1, Sierański2, Lewinski3 et al. 2012International Journal of Inorganic Chemistry0000View full textAdd to dashboardCite

Analysis of 13C NMR Chemical Shielding and XPS for Cellulose and Chitosan by DFT Calculations Using the Model Molecules

Development and Characterization of Corrosion Resistant Coatings Using the Natural Biopolymer Chitosan

Contact Info

Product

Resources

About

The Novel Polymorphic Form of Bis(3,5,7-triaza-1-azoniatricyclo[3.3.1.13,7]decane) bis(μ4
Kruszyński
¹
,
Sierański
²
,
Lewinski
³

et al. 2012
International Journal of Inorganic Chemistry
0
0
0
0
View full text Add to dashboard Cite

The Novel Polymorphic Form of Bis(3,5,7-triaza-1-azoniatricyclo[3.3.1.13,7]decane) bis(μ4
Kruszyński
¹
,
Sierański
²
,
Lewinski
³

et al. 2012
International Journal of Inorganic Chemistry
0
0
0
0
View full text Add to dashboard Cite