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.

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.

scholarly journals Utilization of a Novel Low-Cost Gibto (Lupinus Albus) Seed Peel Waste for the Removal of Malachite Green Dye: Equilibrium, Kinetic, and Thermodynamic Studies

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Adugna Nigatu Alene ◽  
Gietu Yirga Abate ◽  
Adere Tarekegne Habte ◽  
Desiew Mekuanint Getahun
Keyword(s):  
Adsorption Capacity ◽  
Malachite Green ◽  
Low Cost ◽  
Lupinus Albus ◽  
Proximate Analysis ◽  
Point Of Zero Charge ◽  
Alkaline Condition ◽  
Order Kinetic ◽  
Operational Parameters ◽  
Malachite Green Dye

The aim of this study was to investigate the adsorption characteristics of malachite green (MG) dye onto the raw (RLAPW) and activated (ALAPW) surface of Lupinus albus seed peel waste prepared via physicochemical activation under alkaline condition as a dye adsorbent. Proximate analysis, surface area (Sears’ method), point of zero charge (pHzpc), and FTIR analysis were used to characterize the adsorbents. The effects of operational parameters such as pH (4) for ALAPW and pH (6) for RLAPW, adsorbent dose (0.2 g), initial dye concentration (30 mg/L), contact time (60 min), and temperature (298 K) were optimized. The experimental data well fitted with the Freundlich adsorption isotherm with the adsorption capacity of 7.3 mg/g for activated Lupinus albus seed peel waste (ALAPW) and Sips isotherm for raw Lupinus albus seed peel waste (RLAPW) with the adsorption capacity of 6.6 mg/g. The kinetics data well fitted to pseudo-second-order kinetic model for both adsorbents. Thermodynamic study revealed that the bioadsorption process using bioadsorbents was spontaneous and exothermic in nature. Desorption experiment was conducted and showed desorption efficiency at an acidic pH of 2. The results showed that the prepared adsorbents exhibited good adsorption capacity and can be used as an alternative adsorbent for the adsorptive removal of malachite green dyes.

scholarly journals Malachite green dye adsorption from model aqueous solutions using corn cob activated carbon (ccac)

2017 ◽  
Vol 62 (4) ◽  
pp. 293-307 ◽  
Author(s):  
Silvia Burcă ◽  
◽  
Cerasella Indolean ◽  
Andrada Măicăneanu ◽  
◽  
...  
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Malachite Green ◽  
Dye Adsorption ◽  
Corn Cob ◽  
Malachite Green Dye

scholarly journals Integrated experimental and theoretical insights for Malachite Green Dye adsorption from wastewater using low cost adsorbent

2021 ◽  
Author(s):  
EL-Shimaa Ibrahim ◽  
H. Moustafa ◽  
Sahar. A. El-molla ◽  
Shimaa Abdel Halim ◽  
Shaimaa Ibrahim
Keyword(s):  
Malachite Green ◽  
Rayleigh Scattering ◽  
Theoretical Calculations ◽  
Dye Adsorption ◽  
Experimental Results ◽  
Precipitation Method ◽  
Chemical Hardness ◽  
Optical Parameters ◽  
Cationic Form ◽  
Equilibrium Studies

Abstract Water pollution is one of the problems that threaten humanity, and to confront it with only experimental procedures is not enough. It is necessary to integrate both practical methods and theoretical calculations to achieve decontamination with the most accurate interpretation. Hence, discussing the experimental mechanism study of MG dye adsorption with the help of the application of DFT calculations is the main goal of this article herein. The experimental results affirmed that the preparation of γ-Al2O3 by precipitation method using (NH4)2CO3 improved the porosity, the surface capability, and the adsorbent capacities (qmax = 210 mg/g) at optimum condition compared with the previous studies. Kinetic and equilibrium studies referred that the adsorption follows the pseudo-second order model and Freundlich isotherm model, respectively. Also, the calculated and observed thermodynamic parameters exerted positive values of (ΔH°) and (ΔS°) which translates into endothermic process with increasing disorder of the system. Theoretical calculations at DFT- B3LYP/6-31G (d,P) level of theory were calculated to show the selectivity of using the cationic form of the Malachite Green (MG) in the experimental measurements to find interaction mechanism. The electronic structure and intramolecular charge transfer of (MG), its cationic form and the complex of MG-Al were investigated theoretically at the B3LYP/6-31 G (d,p) level of theory. The equilibrium geometries of (MG), its cationic form and the complex of MG-Al were determined, and it was found that these geometries are non-planar. The EHOMO and ELUMO energies can be used to calculate the global properties; chemical hardness (η), softness (S) and electronegativity (χ). The calculated nonlinear optical parameters (NLO) of the studied compounds; the electronic dipole moment (μ), first-order hyperpolarizability (β), the hyper-Rayleigh scattering (βHRS) and the depolarization ratio (DR)) showed promising optical properties. Finally, the computational and the experimental results indicated that the adsorption efficiency of MG from wastewater was directly associated with the dye electrophilicity power.

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