Effect of cupric ion on thermal degradation of quaternized chitosan

Li, Sidong; Zhang, Chaohua; Dong, Jingjing; Ou, Chunyan; Quan, Wei-Yan; Yang, Liting; She, Xiaodong

doi:10.1016/j.carbpol.2010.02.049

Cited by 40 publications

(17 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…33 Magnetic separation can be achieved simply by applying a 34 magnetic force toward magnetic particles. Among the magnetic 35 particles, magnetite (Fe 3 O 4 ) has been used widely in water 36 remediation [15]. However, magnetite shows the lower affinity 37 toward heavy metal ions, especially Cr(VI) in comparison with 38 other common adsorbents.…”

Section: Introductionmentioning

confidence: 99%

A novel pyridinium functionalized magnetic chitosan with pH-independent and rapid adsorption kinetics for magnetic separation of Cr(VI)

Sakti

Narita

Sasaki

et al. 2015

Journal of Environmental Chemical Engineering

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

A novel pyridinium functionalized magnetic chitosan with pH-independent and rapid adsorption kinetics for magnetic separation of Cr(VI)

Sakti

Narita

Sasaki

et al. 2015

Journal of Environmental Chemical Engineering

View full text Add to dashboard Cite

“…Hydroxyl groups in the initial chitosan have a broad absorption band at 3438 cm −1 , and this band is shifted to lower intensity in depolymerized samples, due to formation of sugar rings with five functional groups after depolymerization. The broad absorbance band centered at 3438 cm −1 was the characteristic band of the stretching vibration of −OH and −NH 2 [34]. The band found at 2875cm −1 is attributed to C-H stretching of the alkyl substituent [35].…”

Section: Uv-vis Analysismentioning

confidence: 96%

UV irradiation- $$\hbox {H}_{2} \hbox {O}_{2}$$ H 2 O 2 system as an effective combined depolymerization technique to produce

et al. 2018

View full text Add to dashboard Cite

UV irradiation hydrogen peroxide (H 2 O 2 ) system is used as an effective, easy and low-cost combined depolymerization technique to produce oligosaccharides from chitosan. UV-Vis spectroscopic studies explained that with increasing treatment time, the absorption of the depolymerized chitosan solution has increased, indicating the increase in the carbonyl and amino groups in their structure. Fourier transform infrared spectroscopy and nuclear magnetic resonance (1H NMR) analysis showed that the 1,4-β-d-glucoside linkages of chitosan are degraded without important changes in chemical structure of decomposed samples. X-ray diffraction patterns verified the polymerization of chitosan to produce oligomers, changing in structure from crystalline to amorphous. Viscosity-average molecular weight measurements of fragmented chitosan samples and MarkHouwink equation are used to demonstrate the efficiency of this depolymerization method. Finally, the obtained results ascertained that this combined method could produce water soluble chitosan with significant efficiency and no essential change in its chemical structure.

show abstract

“…Two little bands not completely defined are observed in the range 1700-1550 cm −1 . The band at 1653 cm −1 is attributed to the stretching vibration of the C=O group [22,23], whereas the one at 1594 cm −1 is associated with the bending vibration of the NH group [22,23] in the chitosan acetylated units, and it could overlap with the corresponding band to the NH 2 group [24] in the nonacetylated units. It is reported [22] that these bands may coincide with bands ascribed to OH groups.…”

Section: Diffuse Reflectance Infrared Fourier Transform Spectra (Drifts)mentioning

confidence: 99%

Effect of Chitosan on the Performance of NiMoP-Supported Catalysts for the Hydrodesulfurization of Dibenzothiophene

Ríos-Caloch¹,

Santes²,

Escobar

et al. 2016

Journal of Nanomaterials

View full text Add to dashboard Cite

Chitosan-added NiMoP catalysts supported on alumina and alumina-titania were studied in the hydrodesulfurization (HDS) of dibenzothiophene (DBT). The preparation of catalysts containing Mo (12 wt%), Ni (3 wt%), P (1.6 wt%), and chitosan/nickel = 2 (mol ratio) was accomplished by sequential pore-filling impregnation varying the order of chitosan integration. Materials were characterized by DRIFTS, TPR, TG-DTA, and XPS techniques. The TG-DTA study showed that the nature of the support influences the degradation of chitosan onto the catalytic materials and also influences the HDS of DBT and the product distribution as well. The series of catalysts supported on alumina presented the most remarkable effect of chitosan, in which the OH and NH groups of the organic molecule interact with acid sites of the support weakening the interaction between alumina and deposited metal phases. In all cases, DBT was converted mainly through direct sulfur removal. The catalysts ChP3/A (alumina support impregnated with chitosan in phosphoric acid solution, prior to NiMoP deposition) and ChP4/AT (alumina-titania support impregnated with NiMoP solution, prior to contacting with a solution comprising chitosan and phosphorus) exhibited the best performance in HDS reactions and also showed the highest selectivity in biphenyl formation. Presence of carbonaceous residua on the catalyst’s surface, as shown by XPS, could enhance the HDS activity over the ChP4/AT sample.

show abstract

Effect of cupric ion on thermal degradation of quaternized chitosan

Cited by 40 publications

References 28 publications

A novel pyridinium functionalized magnetic chitosan with pH-independent and rapid adsorption kinetics for magnetic separation of Cr(VI)

A novel pyridinium functionalized magnetic chitosan with pH-independent and rapid adsorption kinetics for magnetic separation of Cr(VI)

UV irradiation- $$\hbox {H}_{2} \hbox {O}_{2}$$ H 2 O 2 system as an effective combined depolymerization technique to produce

Effect of Chitosan on the Performance of NiMoP-Supported Catalysts for the Hydrodesulfurization of Dibenzothiophene

Contact Info

Product

Resources

About