Preparation of some chitosan heavy metal complexes and study of its properties

Hussein, Mohamed H. M.; El-Hady, M. F.; Sayed, W. M.; Hefni, Hassan H.H.

doi:10.1134/s0965545x12020046

Cited by 56 publications

(35 citation statements)

References 48 publications

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“…The amount of water is found to be 12%, based on the TGA weight loss data. The simultaneous TGA/DSC results show that the TGA weight loss corresponded exactly to the DSC endothermic and exothermic peaks . For bentonite, the curve shows three main endothermic processes in parallel with three weight loss steps: an endothermic peak centered at 100°C is accomplished by 19.5% weight loss (TGA curve) at the temperature range 25–200°C that corresponds to the loss of physically adsorbed water on the external surface.…”

Section: Resultssupporting

confidence: 89%

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Synthesis and characterization of crosslinked chitosan immobilized on bentonite and its grafted products with polyaniline

El-Dib

Hussein

Hefni

et al. 2014

J of Applied Polymer Sci

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Chitosan immobilized bentonite (CIB) namely chitosan‐coated bentonite (5% chitosan content) was synthesized in 2% acetic acid solution, followed by crosslinking, using epichlorohydrien (ECH). The so‐obtained crosslinked chitosan immobilized on bentonite (CIB‐ECH) and CIB composites were grafted with polyaniline (PANI) through oxidative‐radical copolymerization using ammonium peroxydisulfate in acidic medium to produce PANI‐grafted crosslinked chitosan immobilized on bentonite (PANI‐g‐CIB‐ECH) and PANI‐grafted‐chitosan immobilized on bentonite (PANI‐g‐CIB) composites, respectively. The resultant composites were characterized by using X‐ray diffraction (XRD), thermo gravimetric analysis/differential scanning calorimetry, scanning electron microscopy, Fourier transform infrared (FTIR), and electrical conductivity. XRD and FTIR analyses indicate that chitosan was not intercalated into the silicate layer. Also the electrical conductivity elucidates that the grafted composites fall in the range required for the application as electrostatic dissipation. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41078.

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Section: Resultssupporting

confidence: 89%

“…The electrical conductivity σ (Ω −1 cm −2 ) was calculated from eq.

σ = \frac{1}{ρ}

where ρ (Ω cm 2 ) is the specific resistance of materials and it is calculated from eq.

ρ = \frac{true(R \times A true)}{L}

where R (Ω) is the resistance, A (cm 3 ) is the total area, and L (cm) is the thickness of the sample.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of crosslinked chitosan immobilized on bentonite and its grafted products with polyaniline

El-Dib

Hussein

Hefni

et al. 2014

J of Applied Polymer Sci

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“…Chitin and chitosan were prepared from shrimp shells according to the following references (14,15) .…”

Section: Methods I Preparation Of Chitin and Chitosan From Shrimp Shellsmentioning

confidence: 99%

A Study on The Effect of Type of Solvent on Chitosan Efficiency for Treatment of Drinking Water Contaminations

2014

Egypt. J. Chem.

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N this research, chitosan (Ch) a natural polymer, was employed in drinking raw water treatment of Nile River against Escherichia coli via simple method, it is dissolution of chitosan in three different solvents;acetic acid (AC),malonic acid (MA) and N carboxymethyl N,N diethylbenzene ammonium chloride (CMEBAC) to produce three different solutions; Ch-AC, Ch-MA and Ch-CMEBAC, respectively. These solutions were characterized by FTIR and elemental analysis. The investigations of their effect against total coliform bacteria of raw water were carried out according to method of Most Probable Number (MPN) at different contact times (30, 60 and 120 min). The results showed that the full inhibition of total coliform were achieved after 30 min as contact time by 7 gm L -1 ml of Ch-Ac , 5 gm L -1 of Ch-Ma and 0.75 gm L -1 ml of Ch-CMEBAC. Otherwise, by increasing of contact time, the volumes of inhibitors (chitosan solutions) decrease.The minimum inhibitory concentration (MIC) values of those solutions were detected as 2.75, 2 and 0.2 µ/ml , respectively.

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“…At higher initial concentration of metal ions, the efficiency decreased to lower values. That is due to; at higher metal ions concentration the biosorbent surface saturated at a certain values (q e ) and the active sites are blocked [32]. At lower concentrations, the biosorbents surfaces do not reach the saturation concentration.…”

Section: Effect Of Initial Metal Ions Concentrationmentioning

confidence: 96%

Metal adsorption by agricultural biosorbents: Adsorption isotherm, kinetic and biosorbents chemical structures

Sadeek

Negm

Hefni

et al. 2015

International Journal of Biological Macromolecules

149

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Preparation of some chitosan heavy metal complexes and study of its properties

Cited by 56 publications

References 48 publications

Synthesis and characterization of crosslinked chitosan immobilized on bentonite and its grafted products with polyaniline

Synthesis and characterization of crosslinked chitosan immobilized on bentonite and its grafted products with polyaniline

A Study on The Effect of Type of Solvent on Chitosan Efficiency for Treatment of Drinking Water Contaminations

Metal adsorption by agricultural biosorbents: Adsorption isotherm, kinetic and biosorbents chemical structures

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