scholarly journals Grafting of O-Carboxymethyl Chitosan with Acrylonitrile and Studying some of its Properties and Applications

2021 ◽  
Vol 28 (2) ◽  
pp. 86-94
Author(s):  
Mohamad Radawn Bazat ◽  
Mohamad Yahay Zien AL-deen ◽  
Hasan AL-Khamisy
Keyword(s):  
Carboxymethyl Chitosan ◽  
Lead Ion ◽  
Metallic Ions ◽  
Industrial Waste Water ◽  
Mechanical Stirring ◽  
Dta Analysis ◽  
Ft Ir ◽  
Grafting Copolymerization ◽  
Water Swelling ◽  
Cerium Sulfate

Preparation of o-carboxymethyl Chitosan was done, wich is important derivative of chitosan. Grafting copolymerization of acrylonitrile onto o-carboxymethyl chitosan was accomplished using ammonium cerium sulfate (CAS) as an initiator. Resulting graft of o-carboxymethyl chitosan was characterized by FT-IR spectrum and DTA analysis to be compared with o-carboxymethyl chitosan. Properties such as water swelling and solubility were studied for each, whereas,. Percentage of grafting efficiency (GE%) and yield of grafting (GY%) were determined. The efficiency of grafted ocarboxymethyl chitosan (CMCh-g-PAN) to remove dyes(direct black dyes, dispersed red dyes) from industrial waste water was also determined. The results reveal good efficient absorption of black dyes more than red dyes. Efficiency from different concentrations of grafted o-carboxymethyl chitosan(CMCh-g-PAN) to reveal percentages of elimination ions from their solutions metallic ions Cu2+,Pb2+,Cd2+and Sn2+ from their solutions at room temperature with mechanical stirring for 24 hrs were also determined .It has been shown that grafted o-carboxymethyl chitosan has important role in elimination of lead ion comparing with other ions, As a result, elimination percentages of ions increase as follow: Cd2+< Sn2+< Cu2+<. Pb2+

Spectral Investigation on the Growth and Characterization of NLO Crystals of Thiourea Succinic Acid Single Crystal.

2015 ◽  
Vol 2 (2) ◽  
pp. 70-73
Author(s):  
Kannan.P ◽  
Thambidurai.S ◽  
Suresh.N
Keyword(s):  
Single Crystal ◽  
Succinic Acid ◽  
Slow Evaporation Technique ◽  
Absorption Studies ◽  
Dta Analysis ◽  
Evaporation Technique ◽  
Ft Ir ◽  
Ir Spectroscopic ◽  
Thermal Stability Of

Growth of optically transparent single crystals of thiourea succinic acid (TUSA) was grown successfully from aqueous solution by slow evaporation technique. The crystal structure was elucidated using the single crystal XRD. The various functional groups and the modes of vibrations were identified by FT-IR spectroscopic analysis. The optical absorption studies indicate that the optical transparency window is quite wide making its suitable for NLO applications. Thermal stability of the crown crystal carried out by TGA-DTA analysis.

1H-NMR Analysis of Degree of Substitution in N,O-Carboxymethyl Chitosans from Various Chitosan Sources and Types

2012 ◽  
Vol 506 ◽  
pp. 158-161 ◽  
Author(s):  
A. Jaidee ◽  
Pornchai Rachtanapun ◽  
S. Luangkamin
Keyword(s):  
Chemical Structure ◽  
Carboxymethyl Chitosan ◽  
Degree Of Substitution ◽  
Resonance Spectroscopy ◽  
Nmr Analysis ◽  
Reaction Conditions ◽  
H Nmr ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Chitosan Oligomer ◽  
Ft Ir

N,O-Carboxymethyl chitosans were synthesized by the reaction between shrimp, crab and squid chitosans with monochloroacetic acid under basic conditions at 50°C. The mole ratio of reactants was obtained from various reaction conditions of shrimp chitosan polymer and oligomer types. The mole ratio 1:12:6 of chitosan:sodium hydroxide:monochloroacetic acid was used for preparing carboxymethyl of chitosan polymer types while carboxymethyl of chitosan oligomer types were used the mole ratio 1:6:3 of chitosan:sodium hydroxide:monochloroacetic acid. The chemical structure was analyzed by fourier transformed infrared spectroscopy (FT-IR) and proton nuclear magnatic resonance spectroscopy (1H-NMR). The FT-IR was used for confirm the insertion of carboxymethyl group on chitosan molecules. The 1H-NMR was used for determining the degree of substitution (DS) of carboxymethylation at hydroxyl and amino sites of chitosans. Carboxymethyl chitosan samples had the total DS of carboxymethylation ranging from 1.0-2.2. The highest of DS of carboxymethylation was from shrimp chitosan oligomer type.

scholarly journals Chitosan and Carboxymethyl Chitosan from Fish Scales of Labeo rohita

2013 ◽  
Vol 61 (1) ◽  
pp. 145-148 ◽  
Author(s):  
Tanvir Muslim ◽  
Mohammad Habibur Rahman ◽  
HOsne Ara Begum ◽  
Md. Azizur Rahman
Keyword(s):  
Molecular Weight ◽  
Spectral Analysis ◽  
Labeo Rohita ◽  
Carboxymethyl Chitosan ◽  
Degree Of Substitution ◽  
Monochloroacetic Acid ◽  
Fish Scales ◽  
Ft Ir

Chitin was extracted from the fish scales of Labeo rohita and chitosan was successfully prepared from it by deacetylation reaction. The prepared chtiosan was characterized by FT-IR spectral analysis and degree of decetylation was determined by pH-metric titration. The molecular weight of chitosan was estimated by viscometric method. Chitosan was converted into its carboxymethyl derivative using alkali and monochloroacetic acid. The prepared carboxymethyl chitosan was characterized by FT-IR spectral analysis and degree of substitution was estimated. Dhaka Univ. J. Sci. 61(1): 145-148, 2013 (January) DOI: http://dx.doi.org/10.3329/dujs.v61i1.15116

Ultrasound promoted green oxidation of alkenes with hydrogen peroxide in the presence of iron porphyrins supported on multi-walled carbon nanotubes

2015 ◽  
Vol 19 (04) ◽  
pp. 622-630 ◽  
Author(s):  
Saeed Rayati ◽  
Zahra Sheybanifard
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Hydrogen Peroxide ◽  
Heterogeneous Catalyst ◽  
Multi Wall Carbon Nanotubes ◽  
Mechanical Stirring ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Ft Ir ◽  
Walled Carbon Nanotubes

In the present work, oxidation of alkenes with hydrogen peroxide in the presence of meso-tetrakis(4-hydroxyphenyl)porphyrinatoiron(III) chloride supported onto surface of functionalized multi-wall carbon nanotubes (FMWCNT), [ Fe ( THPP ) Cl@MWCNT ], is reported. The simple heterogeneous catalyst was characterized by FT-IR spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and also thermal analysis. The amount of the catalyst loaded on the nanotubes was determined by atomic absorption spectroscopy. This heterogeneous catalyst proved to be an efficient and green catalyst and was successfully able to activate hydrogen peroxide without any additive toward the oxidation of alkenes in ethanol as a green solvent. Performance of the catalyst in oxidation of various alkenes was inspected under reflux, ultrasonic irradiation and mechanical stirring. Moreover, the catalyst can be reused several times under similar conditions.

Effects of Preparation Approaches and Oxidizing agents on the Yield, Morphology and Thermal stability of Polyaniline

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Wan Ahmad Kamil Mahmood ◽  
Mohammad Mizanur Rahman Khan ◽  
Yeap Guan Yeow ◽  
Yee Keat Wee
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Reaction Time ◽  
Secondary Growth ◽  
Rapid Mixing ◽  
Oxidizing Agents ◽  
Mechanical Stirring ◽  
Transmission Electron ◽  
Ft Ir ◽  
Polymerization Method

Abstract Evidence of the control of yield and different morphological features of polyaniline (PANI), along with their higher thermal stability is reported. The syntheses were performed by varying the reaction time from 2 to 6 hours for three different methods using three different oxidizing agents. The freshly prepared PANI was investigated by means of fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-Vis), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The polymer yield was increased with the increasing of reaction time from 2 to 6 h for all oxidants in the synthesis approaches; while the reverse trend was observed for KPS in rapid mixing polymerization and mechanical stirring methods. The highest yield was obtained for 6 h reaction time using APS through mechanical stirring method. FESEM analysis showed the growth of regular and uniform PANI nanoparticles, along with the prevention of secondary growth and agglomeration of primary nanofibers using all three oxidizing agents for sonochemistry and rapid mixing polymerization method, except H2O2 in the case of later technique. However, irregular and agglomerated PANI was found for all oxidants in mechanical stirring method. TGA data showed that PANI synthesized by mechanical stirring method is thermally more stable than those prepared by sonochemistry and rapid mixing polymerization.

Preparation of N, O-Carboxymethyl Chitosan with Different Substitutional Degree and its Application for Hemostasis

2013 ◽  
Vol 798-799 ◽  
pp. 1061-1066 ◽  
Author(s):  
Yan Wei Zhao ◽  
Lu Liu ◽  
Xiang Han ◽  
Jing Guan
Keyword(s):  
Carboxymethyl Chitosan ◽  
X Ray Diffraction ◽  
Clotting Time ◽  
X Ray ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Ft Ir ◽  
Ubbelohde Viscometer

We prepared N, O-carboxymethyl chitosans (CMCSs) with different substitutional degrees (SDs) to evaluate their effects of hemostasis, and provided experimental basis on biomedical materials. Chloroethanoic acid was used to synthesize CMCSs. The structure were characterized by Fourier transform infrared (FT-IR) and wide-angle X-ray diffraction (WXRD). Potentiometric titration and Ubbelohde viscometer were adopted to determine the SD and intrinsic viscosity of CMCSs. Contact angle measurements were investigated to determine surface wettability. Method of dynamic clotting time and coagulation test in vivo were used to evaluate their effects of hemostasis. SDs of CMCSs were from 50% to 110%. As the SD increased, molecular weight decreased. CMCS powder with SD 63% possessed excellent hemostasis both in vitro and in vivo. CMCS powder owned hemostatic capability prior to CS. CMCS powder with SD 63% (neither too high, nor too low) possessed excellent hemostasis both in vitro and in vivo.

scholarly journals Growth and Spectral Investigation on Pure Calcium Phosphate Doped With (Copper and Magnesium) Crystals

2021 ◽  
pp. 322-332
Author(s):  
R. Selvaraju ◽  
M. Bhuvaneswari
Keyword(s):  
Calcium Phosphate ◽  
Sol Gel ◽  
Gallbladder Stone ◽  
Calcium Stones ◽  
Gel Method ◽  
Sol Gel Method ◽  
Gallbladder Stones ◽  
Dta Analysis ◽  
Ft Ir

Calcium stones are most commonly occurring form of cholelithiasis or gallbladder stones most one of the oldest and common afflictions of humans. Calcium phosphate is dissolved minerals in causes of renal to gallbladder stone in both human and animals. Of course, the calcium phosphate is one of the components of gallbladder. Calcium phosphate doped with (Cu and Mg) are crystals are grown by sol-gel method. In the present work the growth and characterization of pure and doped with (Cu and Mg) crystals. The grown crystals were characterization by FT-IR, SEM-EDX and TG/DTA analysis.

scholarly journals Performance of N,O-Carboxymethyl Chitosan as Corrosion and Scale Inhibitors in CO2 Saturated Brine Solution

2021 ◽  
Vol 21 (4) ◽  
pp. 954
Author(s):  
Muhamad Jalil Baari ◽  
Bunbun Bundjali ◽  
Deana Wahyuningrum
Keyword(s):  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Chloroacetic Acid ◽  
Carboxymethyl Chitosan ◽  
Scale Formation ◽  
Water Soluble ◽  
Complexing Agent ◽  
Dissolved Gas ◽  
Scale Inhibition ◽  
Ft Ir

The presence of salts and dissolved gas like CO2 that is carried with natural gas and crude oil along the pipeline is the main reason for corrosion and scale formation. These problems are usually resolved separately by corrosion inhibitors and scale inhibitors or acidification. Meanwhile, utilizing a compound to resolve both corrosion and scale formation has an advantage in the economic side and working time. N,O-carboxymethyl chitosan or N,O-CMCs is one of the chitosan's derivates. It is water-soluble and has different functional groups. Those properties support its capability as a complexing agent on corrosion and scale inhibitors. Synthesis of N,O-CMCs was carried out by chemical reactions between chitosan and chloroacetic acid under alkaline circumstances. N,O-CMCs product was characterized using FT-IR and 1H-NMR spectroscopy. The inhibition efficiency was analyzed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. The measurements showed that the highest efficiency of corrosion inhibition reached 63.54% when the concentration and temperature were 30 ppm and 35 °C, respectively. N,O-CMCs was classified as a mixed-type inhibitor. The adsorption mechanism of the inhibitor followed Langmuir adsorption isotherm. The static scale inhibition test informed that the optimum inhibition efficiency of N,O-CMCs reached 60.00%.

Facile and Scaled-Up Synthesis of Inorganic Metallic Ions Doped Nanoscaled Titanium Dioxides and their Enhanced Photocatalytic Property for Phenol Degradation

2011 ◽  
Vol 236-238 ◽  
pp. 1697-1706
Author(s):  
Bao Cang Liu ◽  
Cheng Chen ◽  
Fu Li ◽  
Bo Zhang ◽  
Chang Yan Li ◽  
...  
Keyword(s):  
Waste Water ◽  
Industrial Waste ◽  
Phenol Degradation ◽  
Synthesis Method ◽  
Photocatalytic Property ◽  
Narrow Size Distribution ◽  
Metallic Ions ◽  
Industrial Waste Water ◽  
Effective Technology ◽  
Titanium Dioxides

Photodegradation emerged as an effective technology for elimination of phenol and phenolic compound contaminants. In this paper, we developed an facile and scaled-up synthesis method for production of nanoscaled titanium dioxide (TiO2) photocatalysts doped with inorganic metallic ions of Sn, Zn, Fe, Cr, Mo, W, V, Ce, Au, Ag, Pt, and Pd. The obtained photocatalysts show relatively small sizes around 10 nm with highly crystallinity and narrow size distribution, and their efficiencies for photocatalytic degradation of phenol are greatly enhanced by doping the metallic ions. The photocatalytic efficiencies of nanoscaled TiO2photocatalysts for phenol degradation could be improved to 93.6%, 89% and 98% by doping 2 wt.% Cr, 10 wt.% Ce, and 10 wt.% Pd, respectively, compared with that of the undoped nanoscaled TiO2photocatalysts around 42.5%. The doped nanoscaled TiO2photocatalysts may find potential application in treatment of phenol and phenolic compounds contaminants in industrial waste water.

Comparison of Porosity Improvement of Silk Fibroin Membrane Using Polyethylene Glycol and Glutaraldehyde for Increasing Oxygen Permeability

2013 ◽  
Vol 750-752 ◽  
pp. 1601-1608
Author(s):  
Pacharawan Ratanasongtham ◽  
Ruangsri Watanesk ◽  
Surasak Watanesk
Keyword(s):  
Polyethylene Glycol ◽  
Silk Fibroin ◽  
Oxygen Permeability ◽  
Porous Membrane ◽  
Swelling Behavior ◽  
Random Coil ◽  
Environmental Friendliness ◽  
Ft Ir ◽  
Water Swelling ◽  
Β Sheet

Biomaterial is one of the good candidates for porous membrane preparation according to its environmental friendliness. In this work, the porous membranes of silk fibroin (SF) were prepared by solution casting with the addition of polyethylene glycol (PEG) and glutaraldehyde (GTA) aiming to improve the porosity and oxygen permeability of SF membrane. The conformation of SF was changed from random coil to β sheet form after treatment with MeOH. The interaction existing between SF chains and both PEG and GTA were characterized using Fourier Transform Infrared spectroscopy (FT-IR). The addition of PEG could produce more porosity in the membrane than GTA confirmed by their morphology observed from scanning electron microscopy (SEM). Moreover, the swelling behavior of the SF-PEG and SF-GTA membranes depended on the porous structure of the membrane which directly correlated to their oxygen permeability. The porosity of the SF membranes increased with the increase of PEG and GTA contents up to 40% and 3%w/w, respectively. After that, their porosity decreased as seen through the SEM and water swelling results. In addition, the SF-PEG membrane turned out to have higher degrees of both porosity and oxygen permeability than the SF-GTA membrane which related to its water swelling behavior.

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