Application of Infrared Spectroscopy to Analysis of Chitosan/Clay Nanocomposites

Silva, Suédina Maria de Lima; Braga, Carla R.C.; Fook, Marcus Vinícius Lia; Raposo, Claudia M. O.; Carvalho, Laura H.; Canedo, Eduardo L.

doi:10.5772/35522

Cited by 93 publications

(92 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Polymer cross-linking is evidenced by the broadening of the peaks between ca. 3715-2300 cm -1 , which are inclusive of stretching vibrations of the O-H groups overlapped with the N-H stretching vibrations (3715-3000 cm -1 ) and C-H for -CH 2 (m 1 = 2926 cm -1 ) and -CH 3 (m 2 = 2866 cm -1 ) groups, respectively (Silva et al 2012). The peak areas in Table 2 of the aforementioned broad IR bands for the CGi materials decrease with greater glutaraldehyde content.…”

Section: Sorption Studiesmentioning

confidence: 98%

Sequestration of agrochemicals from aqueous media using cross-linked chitosan-based sorbents

Mohamed

Wilson

2016

Adsorption

View full text Add to dashboard Cite

The sorption properties are reported for chitosan and its cross-linked forms (chitosan-glutaraldehyde; CG) with some model agrochemical sorbates [pentachlorophenol (PCP), 2,4-dichlorophenol (2,4-DCP) and 2,4-dichlorophenoxy acetic acid (2,4-D), dicamba and carbofuran]. The CG cross-linked materials were prepared at variable C:G monomer mole ratios: 1:0.5 (CG1), 1:1 (CG2), (CG3). The sorbents were characterized using diffuse reflectance infrared Fourier transform spectroscopy, thermogravimetric analysis and a dye sorption method using phenolphthalein. The sorption studies were carried out in aqueous solution at pH 9 except for dicamba and carbofuran (pH 7). The isotherm results were evaluated by the Sips, Freundlich, and Langmuir models. The Sips model provided the ''best-fit'' results where the sorption capacity increased as the cross-linker content of the CG materials increased. The relative uptake for chitosan and its cross-linked forms adopted the following order: PCP [ 2,4-DCP [ 2,4-D. In the case of dicamba and carbofuran, the former had a higher sorptive uptake. The variable uptake of the sorbates were attributed to their relative lipophilicity where the main driving force of these solid-solution systems relates to hydrophobic effects, in accordance with the tunable physicochemical properties of the chitosan sorbent materials.

show abstract

Section: Sorption Studiesmentioning

confidence: 98%

Sequestration of agrochemicals from aqueous media using cross-linked chitosan-based sorbents

Mohamed

Wilson

2016

Adsorption

View full text Add to dashboard Cite

show abstract

“…e band at 890 cm −1 is related to the glycosidic bonds [36]. Figure 10 shows bands for CMC at 1570 cm , which are assigned to asymmetrical COOstretching, symmetrical stretching, and C-H bending, respectively, indicating the presence of the carboxymethyl ether group.…”

Section: Ftir Of Hydrogelsmentioning

confidence: 99%

Polyelectrolyte Complexation versus Ionotropic Gelation for Chitosan-Based Hydrogels with Carboxymethylcellulose, Carboxymethyl Starch, and Alginic Acid

Henao

Delgado

Contreras

et al. 2018

International Journal of Chemical Engineering

View full text Add to dashboard Cite

e preparation of gels by charge interaction methods has been extensively studied, but it is not yet clear how these methods influence gel characteristics. e objective of this work was to study differences in morphology and surface charge of hydrogels prepared by ionotropic gelation, polyelectrolyte complexation, and a combination of both methods. us, the anionic charge was provided by carboxymethylcellulose (CMC), carboxymethylated starch (CMS), and alginic acid (AA); calcium chloride (CaCl 2 ) and chitosan (CS) were used for the ionotropic gelation and polyelectrolyte complexation, respectively. ose materials are commercially available, have low toxicity, and are widely used in the area. ese compounds interact through physical crosslinks, which are affected by physical changes of the medium. Our results showed that these two methods produced changes in the morphology of the hydrogels. CMC gels exhibited larger pores in the presence of CaCl 2 . In polyelectrolyte complexation, CMS produced an increased agglomeration of particles, while the addition of CaCl 2 to AA generated dispersed particles of size in the order of millimeters. Mixing both ionotropic gelation and polyelectrolyte complexation methods yielded gels of varied charge (568 mV for CMC, 502 mV for CMS, and 1713 mV for AA). FTIR spectra of the hydrogels showed interactions between the different polymeric compounds, being the greatest changes between 1250 and 1600 cm −1 , due possibly to the replacement of Na by Ca at crosslinking points. erefore, the method of gel preparation employed had a major influence on the size and pore distribution, parameters which in turn influence encapsulation and drug delivery in these systems.

show abstract

“…Therefore, the hygroscopic agricultural fertilizer conducted number of experiments by providing coating on fertilizer use latex-chitosan composite, coating is expected to deacetylation of the chitosan. Finally, the spectrum a small peak at ~ 890 cm-1 relating to the movement of saccharides structure of chitosan [13] Further details of the polymer functions groups were studied using ATR-FTIR analysis. Fig.…”

Section: Resultsmentioning

confidence: 99%

Making the Nitrification Inhibitor with Latex- Chitosan Raw Material for Agricultural Fertilizers Products

Habibie¹,

Hamzah²,

Hidayat³

et al. 2017

SOJMSE

View full text Add to dashboard Cite

Application of Infrared Spectroscopy to Analysis of Chitosan/Clay Nanocomposites

Cited by 93 publications

References 43 publications

Sequestration of agrochemicals from aqueous media using cross-linked chitosan-based sorbents

Sequestration of agrochemicals from aqueous media using cross-linked chitosan-based sorbents

Polyelectrolyte Complexation versus Ionotropic Gelation for Chitosan-Based Hydrogels with Carboxymethylcellulose, Carboxymethyl Starch, and Alginic Acid

Making the Nitrification Inhibitor with Latex- Chitosan Raw Material for Agricultural Fertilizers Products

Contact Info

Product

Resources

About