Chitosan Cellulose Acetate Microspheres Preparation for Enhancement of Water-soluble Dye Adsorption

2011 ◽  
Vol 239-242 ◽  
pp. 2855-2858 ◽  
Author(s):  
Hui Yun Zhou ◽  
Dong Ju Zhou ◽  
Chen Jie Fan ◽  
Xi Guang Chen
Keyword(s):  
Cellulose Acetate ◽  
Malachite Green ◽  
Dye Adsorption ◽  
Correlation Coefficients ◽  
Langmuir Model ◽  
Water Soluble ◽  
Freundlich Model ◽  
Initial Concentration ◽  
Adsorption Of Water ◽  
Size Interval

Chitosan/cellulose acetate multimicrospheres (CCAM) were prepared by the method of W/O/W emulsion with no toxic reagents and had the size interval of 200--280µm. It was investigated as an ideal alternative to enhancement the adsorption of water-soluble dyes from wastewater. The correlation coefficients of adsorption isotherm showed that the Freundlich model was comparable to the Langmuir model. The 1/n was lower than 1.0, indicating that malachite green was favorably adsorbed by CCAM. Furthermore, the amount of malachite green absorbed steeply increased with increasing time and reached plateau values within 2 h and increased with increasing of initial concentration of malachite green from 5 to 25 mg/g.

REMOVAL OF HEAVY METAL Cr (II), Ni (II), Cu (II), Zn (II), Cd (II), Pb (II) IONS FROM AQUEOUS SOLUTION BY MENTHA PIPERITA EXTRACT

2020 ◽  
pp. 15-20
Author(s):  
Ersin Yucel ◽  
Mine Yucel
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
High Efficiency ◽  
Correlation Coefficients ◽  
Langmuir Model ◽  
Mentha Piperita ◽  
Freundlich Model ◽  
Biosorption Capacity ◽  
Peppermint Extract ◽  
The Stability

In this study, the usage of the peppermint (Mentha piperita) for extracting the metal ions [Mg (II), Cr (II), Ni (II), Cu (II), Zn (II), Cd (II), Pb (II)] that exist at water was investigated. In order to analyze the stability properties, Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms were used at removing the metal ions and the highest correlation coefficients (R2) were obtained at Langmuir isotherm. Therefore, it is seen that the Langmuir model is more proper than the Freundlich model. However, it was found that the correlation coefficients of removing Ni and Cd is higher at Freundlich model than Langmuir and low at Dubinin-Radushkevich isotherm. It is established that the biosorption amount increase depends on the increase of biosorbent and it can be achieved high efficiency (95%) even with small amount (0.6 mg, peppermint extract) at lead ions. It is also determined that the peppermint extracted that is used at this study shows high biosorption capacity for metal ions and can be used for immobilization of metals from polluted areas.

scholarly journals Removal of lead from aqueous solutions using three biosorbents of aquatic origin with the emphasis on the affective factors

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Maryam Rezaei ◽  
Nima Pourang ◽  
Ali Mashinchian Moradi
Keyword(s):  
Aqueous Solutions ◽  
Langmuir Model ◽  
Influential Factor ◽  
Freundlich Model ◽  
Box Behnken Design ◽  
Initial Concentration ◽  
Affective Factors ◽  
Maximum Sorption ◽  
First Time ◽  
Xrf Analyses

AbstractThe biosorptive potentials of three aquatics-based biosorbents, including shells of a bivalve mollusk and scales of two fish species for Pb removal from aqueous solutions were evaluated, for the first time. A Box–Behnken design with the response surface methodology was used to investigate the effects of the seven important variables (contact time, temperature, initial concentration, dosage, size, salinity and pH) on the sorption capacity of the sorbents. Among the seven studied factors, the effects of biosorbent dosage, initial concentration and pH were significant for all the response variables, while biosorbent size was not significant for any of the responses. The initial concentration was the most influential factor. The presence of Pb ions on the surfaces of the biosorbents after the adsorption was clearly confirmed by the SEM–EDX and XRF analyses. The maximum sorption capacities of the biosorbents were comparable to the literature and the descending order was as follows: scales of Rutilus kutum and Oncorhynchus mykiss and the shells of Cerastoderma glaucum. The isotherm studies revealed Langmuir model applicability for the Pb adsorption by R. kutum and O. mykiss scales, while Freundlich model was fitted to the adsorption C. glaucum shells.

ADSORPTION OF MALACHITE GREEN DYE ON CLAY AND MODIFIED CLAY

2019 ◽  
pp. 445-451
Author(s):  
Violeta Rakić ◽  
Milena Miljković ◽  
Vojkan Miljković ◽  
Marjan Ranđelović
Keyword(s):  
Adsorption Capacity ◽  
Malachite Green ◽  
Dye Adsorption ◽  
Theoretical Models ◽  
Langmuir Model ◽  
Experimental Results ◽  
Textile Dye ◽  
Concentrated Solutions ◽  
Modified Clay ◽  
Malachite Green Dye

The goal of this study was to investigate the possibility of using natural materials based on clay and polysaccharides of carboxymethylcellulose as adsorbents for removing the textile dye malachite green from its solution. In this article, adsorption of dye on native clay and modified clay containing 3% carboxymethylcellulose was compared. The experimental results of dye adsorption with native and modified clay were interpreted using theoretical models of adsorption isotherms. The best match of the experimental results for native clay was achieved with the Langmuir model, and a slightly lower degree of correlation existed for the Freundlich's model. A good matching with the Langmuir's model indicates monolayer dye adsorption as well as certain energy homogeneity of the surface. After modification of the clay with carboxymethylcellulose, a better maching with the Freundlich's model was observed. This indicated that, as a consequence of the application of carboxymethylcellulose, the surface of the clay was changed in chemical and energy terms. The native clay had a lower adsorption capacity compared to clay modified with carboxymethylcellulose. The use of modified clay to remove the dye of malachite green was advisable in very concentrated solutions, because it showed obvious advantages compared to native clay.

scholarly journals Removal of acid brown 354 from wastewater by aminized cellulose acetate nanofibers: experimental and theoretical study of the effect of different parameters on adsorption efficiency

2021 ◽  
Author(s):  
Mehran Namjoufar ◽  
Ali Farzi ◽  
Afzal Karimi
Keyword(s):  
Adsorption Isotherm ◽  
Cellulose Acetate ◽  
Adsorption Process ◽  
Theoretical Study ◽  
Adsorption Efficiency ◽  
Aquatic Life ◽  
Freundlich Model ◽  
Initial Concentration ◽  
Pseudo Second Order ◽  
Maximum Removal

Abstract Wastewater effluents usually involve dyes which are dangerous for aquatic life and other environments. Many of these dyes are toxic, carcinogenic, and can cause skin and eye irritation. In this study, firstly aminized cellulose acetate was prepared from cellulose acetate and applied for the adsorption of acid brown 354 from aqueous solutions. The effects of different parameters including adsorbent dosage, pH, temperature, and initial concentration of dye on adsorption capacity were examined. Results showed that removal efficiency of dye declined by increasing values of all parameters. Finally, maximum removal of dye was achieved in presence of 0.1 g adsorbent, pH of 2, and 10 mg/L of initial dye concentration at temperature of 25 °C. Also, different adsorption isotherms were investigated including Langmuir, Temkin, and Freundlich models and results demonstrated that the adsorption isotherm of dye followed Freundlich model with correlation coefficient of 0.988 revealing that the bond between dye and the adsorbent is strong. Finally, kinetic study indicated that the adsorption of dye is exactly governed by pseudo-second-order kinetics explaining that the adsorption process is chemical and the adsorbent can not be reused.

Controlled Release of Metformin Hydrochloride I. In vitro Release from Physical Mixture Containing Xanthan Gum as Hydrophilic Rate Retarding Polymer

1970 ◽  
Vol 4 (1) ◽  
Author(s):  
Mashkura Ashrafi ◽  
Jakir Ahmed Chowdhury ◽  
Md Selim Reza
Keyword(s):  
Controlled Release ◽  
Xanthan Gum ◽  
In Vitro Release ◽  
Correlation Coefficients ◽  
High Ratio ◽  
Water Soluble ◽  
Metformin Hydrochloride ◽  
Model Drug ◽  
Very High

Capsules of different formulations were prepared by using a hydrophilic polymer, xanthan gum and a filler Ludipress. Metformin hydrochloride, which is an anti-diabetic agent, was used as a model drug here with the aim to formulate sustained release capsules. In the first 6 formulations, metformin hydrochloride and xanthan gum were used in different ratio. Later, Ludipress was added to the formulations in a percentage of 8% to 41%. The total procedure was carried out by physical mixing of the ingredients and filling in capsule shells of size ‘1’. As metformin hydrochloride is a highly water soluble drug, the dissolution test was done in 250 ml distilled water in a thermal shaker (Memmert) with a shaking speed of 50 rpm at 370C &plusmn 0.50C for 6 hours. After the dissolution, the data were treated with different kinetic models. The results found from the graphs and data show that the formulations follow the Higuchian release pattern as they showed correlation coefficients greater than 0.99 and the sustaining effect of the formulations was very high when the xanthan gum was used in a very high ratio with the drug. It was also investigated that the Ludipress extended the sustaining effect of the formulation to some extent. But after a certain period, Ludipress did not show any significant effect as the pores made by the xanthan gum network were already blocked. It is found here that when the metformin hydrochloride and the xanthan gum ratio was 1:1, showed a high percentage of drug release, i.e. 91.80% of drug was released after 6 hours. But With a xanthan gum and metformin hydrochloride ratio of 6:1, a very slow release of the drug was obtained. Only 66.68% of the drug was released after 6 hours. The percent loading in this case was 14%. Again, when Ludipress was used in high ratio, it was found to retard the release rate more prominently. Key words: Metformin Hydrochloride, Xanthan Gum, Controlled release capsule Dhaka Univ. J. Pharm. Sci. Vol.4(1) 2005 The full text is of this article is available at the Dhaka Univ. J. Pharm. Sci. website

Water-soluble polymeric particle embedded cryogels: Synthesis, characterisation and adsorption of haemoglobin

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Kadir Erol ◽  
Melda Bolat Bülter ◽  
Dursun Ali Köse ◽  
Hatice Kaplan Can
Keyword(s):  
Copper Ions ◽  
Langmuir Model ◽  
Water Soluble ◽  
Hydroxyethyl Methacrylate ◽  
Adsorption Ability ◽  
Adsorption Interaction ◽  
Polymeric Particle ◽  
Adsorption Desorption ◽  
Desorption Cycle ◽  
Soluble Poly

Abstract Making cryogels, which are among today’s accepted adsorbents, more functional with different methods, has been one of the subjects spent overtime. In this study, water-soluble poly(maleic anhydride-alt-acrylic acid) polymer embedded in poly(2-hydroxyethyl methacrylate) cryogels. Copper ions were then immobilised to this structure, and this polymer was used for adsorption of haemoglobin from aqueous systems. Adsorption interaction was carried out on an electrostatic basis, and approximately 448.62 mg haemoglobin/g polymer adsorption capacity value was obtained. It was found that the same material has managed to maintain its adsorption ability by 90.3% even after the use of it five times in the adsorption/desorption cycle. The adsorption interaction was determined to be appropriate for the Langmuir model by isotherm studies. The change in Gibbs free energy value was calculated as −2.168 kJ/mol.

Polylactide/cellulose acetate biocomposites as potential coating membranes for controlled and slow nutrients release from water-soluble fertilizers

2021 ◽  
Vol 156 ◽  
pp. 106255
Author(s):  
Taha El Assimi ◽  
Roko Blažic ◽  
Elvira Vidović ◽  
Mustapha Raihane ◽  
Abdellatif El Meziane ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Water Soluble

scholarly journals Visualizing monolayers with a water-soluble fluorophore to quantify adsorption, desorption, and the double layer

2015 ◽  
Vol 112 (8) ◽  
pp. E826-E835 ◽  
Author(s):  
Ian C. Shieh ◽  
Joseph A. Zasadzinski
Keyword(s):  
Double Layer ◽  
Fluorescent Dyes ◽  
Selective Adsorption ◽  
Dye Adsorption ◽  
Immiscible Liquid ◽  
Water Soluble ◽  
Fluorescence Signal ◽  
Anionic Phospholipid ◽  
Gas Phases ◽  
Disordered Phase

Contrast in confocal microscopy of phase-separated monolayers at the air–water interface can be generated by the selective adsorption of water-soluble fluorescent dyes to disordered monolayer phases. Optical sectioning minimizes the fluorescence signal from the subphase, whereas convolution of the measured point spread function with a simple box model of the interface provides quantitative assessment of the excess dye concentration associated with the monolayer. Coexisting liquid-expanded, liquid-condensed, and gas phases could be visualized due to differential dye adsorption in the liquid-expanded and gas phases. Dye preferentially adsorbed to the liquid-disordered phase during immiscible liquid–liquid phase coexistence, and the contrast persisted through the critical point as shown by characteristic circle-to-stripe shape transitions. The measured dye concentration in the disordered phase depended on the phase composition and surface pressure, and the dye was expelled from the film at the end of coexistence. The excess concentration of a cationic dye within the double layer adjacent to an anionic phospholipid monolayer was quantified as a function of subphase ionic strength, and the changes in measured excess agreed with those predicted by the mean-field Gouy–Chapman equations. This provided a rapid and noninvasive optical method of measuring the fractional dissociation of lipid headgroups and the monolayer surface potential.

Synthesis, Characterization and Adsorption Studies of a Graphene Oxide/Polyacrylic Acid Nanocomposite Hydrogel

2021 ◽  
Vol 19 (9) ◽  
pp. 46-54
Author(s):  
Makarim A. Mahdi ◽  
Aymen A.R. Jawad ◽  
Aseel M. Aljeboree ◽  
Layth S. Jasim ◽  
Ayad F. Alkaim
Keyword(s):  
Industrial Effluents ◽  
Langmuir Model ◽  
Isotherm Models ◽  
Nanocomposite Hydrogel ◽  
Adsorption System ◽  
Order Model ◽  
Solution Ph ◽  
Freundlich Model ◽  
Dye Sorption ◽  
Pseudo Second Order

The AAc/GO nanocomposite hydrogel was successfully employed as a polymeric Nano sorbent of the removal efficiency of M G dye from the model. The complication of the mechanism of the adsorption system was completely exposed by examining how solution pH affects adsorption, Ionic strength isotherm models, kinetic models, and thermodynamics. The adsorption of the MG dye was greatly dependent on the solution pH. The Freundlich model has been demonstrated to be the most accurate in describing the MG dye sorption, whilst the Langmuir model was shown to be the least accurate. Additionally, these integrated mechanisms fit nicely within the framework of a pseudo-second-order model. Additionally, the contact time at equilibrium short (ten minutes) required to MG removes demonstrates the AAc/GO nanocomposite hydrogel can be considered an efficient and potentially useful adsorbent for MG removal from industrial effluents.

Sign in / Sign up

Export Citation Format

Share Document