scholarly journals Adsorption of Malachite Green Dye by Acid Activated Carbon - Kinetic, Thermodynamic and Equilibrium Studies

2011 ◽  
Vol 8 (1) ◽  
pp. 9-18 ◽  
Author(s):  
P. K. Baskaran ◽  
B. R. Venkatraman ◽  
S. Arivoli
Keyword(s):  
Zea Mays ◽  
Malachite Green ◽  
Physical Adsorption ◽  
Equilibrium Studies ◽  
First Order ◽  
Malachite Green Dye ◽  
Before And After ◽  
Intra Particle Diffusion ◽  
Uv Visible ◽  
Malachite Green Oxalate

The ability of zea mays dust carbon to remove malachite green from aqueous solutions has been studied for different adsorbate concentrations by varying the amount of adsorbent, temperature, pH and shaking time. Thermodynamic parameters such as ΔH°,ΔS°and ΔG°, were calculated from the slope and intercept of the linear plots. Analysis of adsorption results obtained at 303, 313, 323 and 333 K showed that the adsorption pattern on zea mays dust carbon seems to follow the Langmuir and Freundlich. The numerical values of sorption free energy indicate physical adsorption. The kinetic data indicated an intra-particle diffusion process with sorption being first order. The concentration of malachite green oxalate was measured before and after adsorption by using UV-visible spectrophotometer.

scholarly journals Photocatalytic Degradation of Malachite Green Dye from Aqueous Solution Using Environmentally Compatible Ag/ZnO Polymeric Nanofibers

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2033
Author(s):  
Marwa F. Elkady ◽  
Hassan Shokry Hassan
Keyword(s):  
Photocatalytic Degradation ◽  
Malachite Green ◽  
Degradation Efficiency ◽  
Solution Flow Rate ◽  
Gravimetric Analysis ◽  
Electrospinning Technique ◽  
Malachite Green Dye ◽  
Polymeric Nanofibers ◽  
Before And After ◽  
Surface Modified

An efficient, environmentally compatible and highly porous, silver surface-modified photocatalytic zinc oxide/cellulose acetate/ polypyrrole ZnO/CA/Ppy hybrid nanofibers matrix was fabricated using an electrospinning technique. Electrospinning parameters such as solution flow rate, applied voltage and the distance between needles to collector were optimized. The optimum homogenous and uniform ZnO/CA/Ppy polymeric composite nanofiber was fabricated through the dispersion of 0.05% wt ZnO into the dissolved hybrid polymeric solution with an average nanofiber diameter ranged between 125 and 170 nm. The fabricated ZnO-polymeric nanofiber was further surface-immobilized with silver nanoparticles to enhance its photocatalytic activity through the reduction of the nanofiber bandgap. A comparative study between ZnO polymeric nanofiber before and after silver immobilization was investigated using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) and thermal gravimetric analysis (TGA). The photocatalytic degradation efficiency of the two different prepared nanofibers before and after nanosilver immobilization for malachite green (MG) dye was compared against various experimental parameters. The optimum degradation efficiency of nanosilver surface-modified ZnO-polymeric nanofibers was recorded as 93.5% for malachite green dye after 1 h compared with 63% for ZnO-polymeric nanofibers.

scholarly journals Effects of Modifying Agents on the Dyeability of Cotton Fabric using Malachite Green Dye

2017 ◽  
Vol 2 (1) ◽  
pp. 26-36 ◽  
Author(s):  
Isah A. Bello ◽  
Olugbenga S. Bello ◽  
Kayode A. Adegoke
Keyword(s):  
Malachite Green ◽  
Cotton Fabric ◽  
Acidic Solution ◽  
Cost Effective ◽  
Dye Uptake ◽  
Malachite Green Dye ◽  
Optimum Parameters ◽  
Environmental Friendly ◽  
Before And After ◽  
Time Required

AbstractChanges in thermodynamic parameters as a result of modifying agents on dye uptake of cotton fabric using malachite green (MG) dye was investigated in this study. Five modifying agents {Acetic acid (CH3COOH), hydrated Sodium carbonate (Na2CO3.10H2O), Sodium Chloride (NaCl), Ammonium sulphate ((NH4)2SO4) and Hydrogen peroxide (H2O2)} were used on cotton fabric. The equilibrium exhaustions (%E) were determined before and after modification of the cotton fabric at different concentrations which were 88.24%, 80%, 77.14%, 65.10% and 30.88% for CH3COOH, NaCl, (NH4)2SO4, Na2CO3.10H2O and H2O2 respectively. The results also showed a correlation between the standard affinity(-Δμθ) of dye on cotton fabric and the equilibrium exhaustion. The values of entropy (ΔSθ) and enthalpy (ΔHθ) change revealed the feasibility (spontaneity) and exothermic nature of the reaction. The optimum parameters were attained in acidic solution (CH3COOH) at the highest temperature (70 °C) of dyeing as it showed the highest % efficiency of 88.24%. This work established that modification of cotton fabric with modifying agents is one of the best route to improve the affinity between dye and fabric as it reduces stress, amount of dyes wasted in dyeing, time required to achieve satisfactory results leading to a cost effective environmental friendly approach in the field of cotton dyeing.

scholarly journals Dynamics and Model Research on the Electrosorption by Activated Carbon Fiber Electrodes

Water ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 62
Author(s):  
Lan Ma ◽  
Luyue Huang ◽  
Yongyi Xu ◽  
Chang Liu ◽  
Feng Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Physical Adsorption ◽  
Activated Carbon Fiber ◽  
Polluted Water ◽  
Diffusion Resistance ◽  
First Order ◽  
Model Research ◽  
Carbon Fiber Electrodes ◽  
Intra Particle Diffusion

Electrosorption is a new emerging technology for micro-polluted water treatment. To gain a more accurate understanding of the mass and charge transfer process of electrosorption, the electrosorption performance of activated carbon fiber (ACF) electrodes with various concentrations was studied. In this paper, quasi-first-order and quasi-second-order dynamic equations, and an intra-particle diffusion equation were used to describe the electrosorption behaviors. It is believed that the electrosorption process is dominated by physical adsorption for ACF material, and the most important rate control steps in this process are intra-diffusion and electromigration steps. Based on the experimental results and modified Donnan model theory, a considerable electrosorption dynamic model which considered the influence of physical adsorption and the intra-diffusion resistance was proposed. This model quantitatively described the salt adsorption and charge storage in the ACF electrode and can fit the experimental data well.

scholarly journals Photocatalytic Degradation of a Basic Dye Using Zinc Oxide Nanocatalyst

2019 ◽  
Vol 81 ◽  
pp. 18-26 ◽  
Author(s):  
Maureen O. Chijioke-Okere ◽  
Nnaemeka John Okorocha ◽  
Basil N. Anukam ◽  
Emeka E. Oguzie
Keyword(s):  
Zinc Oxide ◽  
Malachite Green ◽  
Uv Light ◽  
Degradation Kinetics ◽  
Catalyst Loading ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
First Order ◽  
Malachite Green Dye ◽  
Order Kinetic Model

The potential of Calcinated and uncalcinated zinc oxide as effective Photocatatlyst for the degradation of malachite green dye, MG from aqueous medium using UV light has been identified. The photocatalysts were characterized using scanning electron microscope, SEM and x-ray diffraction, XRD. The SEM investigations of the calcinated ZnO revealed highly dispersed nanomaterials and the particles were of nanometer size in agreement with the XRD result. The uncalcinated zinc oxide, ZnO revealed some pronounced nanoparticles. The degradation of MG by the photocatalyst was found to be influenced by adsorbent loading and irradiating time. The optimum degradation was obtained at 0.5g catalyst loading of both calcinated and uncalcinated zinc oxide which is 98.48% and 96.31 % respectively at 150 minutes. The degradation kinetics conformed to the pseudo-first-order kinetic model. The present study showed that calcinated and uncalcinated zinc oxide ZnO can be effectively used as efficient photocatalyst for the degradation of Malachite green dyes from aqueous solutions and effluents.

scholarly journals Adsorptive Removal of Malachite Green Dye from Aqueous Solution Using Chemically Modified Charred and Xanthated Wheat Bran

2020 ◽  
Vol 41 (1) ◽  
pp. 103-109
Author(s):  
Dilli Dhami ◽  
Puspa Lal Homagai
Keyword(s):  
Aqueous Solution ◽  
Malachite Green ◽  
Wheat Bran ◽  
Ph Effect ◽  
Attractive Alternative ◽  
Adsorptive Removal ◽  
Chemically Modified ◽  
Malachite Green Dye ◽  
Before And After ◽  
Initial Ph

Adsorptive removal of Malachite Green (MB) dye from aqueous solution using chemically modified Wheat Bran has been investigated. Wheat bran was chemically modified to charred through charring process and it was further modified to xanthated through xanthation process. Batch experiments were carried out to study the experimental parameters such as effect of pH, effect of concentration and effect of contact time for both Charred Wheat Bran (CWB) and Xanthated Wheat Bran (XWB) simultaneously. The concentrations of dye ions before and after the adsorption were determined by using UV-Visible Spectrophotometer. The dye uptake was maximum for the initial pH of 4 for both CWB and XWB but the percentage removal for XWB was found to be effective in comparison with CWB i.e., 98.45% and 93.45% respectively with adsorbent dose of 0.025g and agitation speed of 190 rpm. The applicability of Langmuir isotherm was tested. The adsorption capacity of MG dye into CWB and XWB was found to be 69 mg/g and 112.9 mg/g, respectively. Similarly, the kinetic data best fitted for pseudo-second order. Hence, the result showed that XWB may be an attractive alternative for the removal of MG dye from aqueous solution in comparison to CWB as bio-adsorbent.

scholarly journals Adsorption of Di-N-butyl Phthalate onto Nutshell-Based Activated Carbon. Equilibrium, Kinetics and Thermodynamics

2009 ◽  
Vol 27 (7) ◽  
pp. 685-700 ◽  
Author(s):  
Z.Q. Fang ◽  
H.J. Huang
Keyword(s):  
Activated Carbons ◽  
Good Description ◽  
Freundlich Isotherm ◽  
Batch Adsorption ◽  
Equilibrium Studies ◽  
First Order ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Pseudo First Order ◽  
Butyl Phthalate

The adsorption of di-n-butyl phthalate (DBP) from aqueous solution was studied in a batch adsorption system. Activated carbons from coals, coconut shell and nutshell were evaluated to determine the most effective adsorbent. Kinetic and equilibrium studies were investigated at various initial DBP concentration (3–6 mg/ℓ), adsorbent dosage (40–140 mg/ℓ), suspension pH (3–9) and temperature (25–55 °C). Equilibrium adsorption isotherms were analyzed using the Langmuir, Freundlich and Temkin models. The experimental isotherms were S-type, with the Freundlich isotherm giving a good description of the data obtained at lower DBP concentration. The pseudo-first-order, pseudo-second-order and intra-particle diffusion models were used to fit the kinetic adsorption data. It was found that the adsorption of DBP followed pseudo-first-order kinetics, with the adsorption rate being controlled by both film and pore diffusion. The enthalpy, entropy and Gibbs' free energy constants were calculated. It was found that the adsorption was spontaneous and endothermic, with favourable adsorption capacities being observed at higher temperatures.

scholarly journals Decolorizing of Malachite Green Dye by Adsorption Using Corn Leaves as Adsorbent Material

2021 ◽  
Vol 27 (2) ◽  
pp. 1-12
Author(s):  
Omar Hisham Fadhel ◽  
Mohammed Yaqob Eisa ◽  
Ziad Rafaa Zair
Keyword(s):  
Aqueous Solution ◽  
Malachite Green ◽  
Contact Time ◽  
Freundlich Isotherm ◽  
Order Kinetic ◽  
Batch Mode ◽  
Adsorbent Dosage ◽  
First Order ◽  
Malachite Green Dye ◽  
Pseudo First Order

This paper presents the ability to use cheap adsorbent (corn leaf) for the removal of Malachite Green (MG) dye from its aqueous solution. A batch mode was used to study several factors, dye concentration (50-150) ppm, adsorbent dosage (0.5-2.5) g/L, contact time (1-4) day, pH (2-10), and temperature (30-60)   The results indicated that the removal efficiency increases with the increase of adsorbent dosage and contact time, while inversely proportional to the increase in pH and temperature. An SEM device characterized the adsorbent corn leaves. The adsorption's resulting data were in agreement with Freundlich isotherm according to the regression analysis, and the kinetics data followed pseudo-first-order kinetic with a correlation coefficient of 0.9309. The thermodynamic data show that the process is exothermic and reversible. The highest removal of MG was 91%, which gave proof that the corn leaves as adsorbent material have the capability of adsorbing the MG dye for aqueous solutions

scholarly journals Removal of Malachite Green Dye using Keggin Polyoxometalate Intercalated ZnAl Layered Double Hydroxide

2021 ◽  
Vol 18 (10) ◽  
Author(s):  
Aldes LESBANI ◽  
Tarmizi TAHER ◽  
Neza Rahayu PALAPA ◽  
Risfidian MOHADI ◽  
Mardiyanto Mardiyanto ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Surface Area ◽  
Malachite Green ◽  
Interlayer Space ◽  
Physical Adsorption ◽  
Bet Surface Area ◽  
Layered Compound ◽  
Basal Spacing ◽  
Keggin Ion ◽  
Malachite Green Dye

The ZnAl Layered double hydroxides (LDHs) have been successfully synthesized by the coprecipitation method, followed by intercalation using Keggin ion of α-dodecatungstosilicic acid [α-SiW12O40]4- to form ZnAl-[α-SiW12O40] LDHs. The prepared ZnAl-[SiW12O40] LDHs were characterized by using X-Ray, FTIR, and BET surface area analyses, which were, then, used as adsorbents of malachite green dye from aqueous solution. The synthesized ZnAl LDH showed a typical diffraction peak of the layered compound at 11o (003) with an interlayer space of 8.59 Å. After intercalation, it was recorded that the interlayer space of ZnAl-[SiW12O40] LDH increased to 10.65 Å. Moreover, the specific surface area of the intercalated LDH increased from 1.9685 to 14.0422 Å. The adsorption study revealed that the adsorption capacity of ZnAl-[SiW12O40] LDH toward malachite green dye was higher (37.514 mg.g-1) than the pristine ZnAl LDH (32.845 mg.g-1). The adsorption kinetics study showed that malachite green adsorption onto both pristine and intercalate LDH followed the pseudo-2nd-order model. The adsorption thermodynamic investigation indicated that adsorption of malachite green onto ZnAl-[SiW12O40] LDH was a spontaneous process and was classified as physical adsorption with activation energy ranging from 10.074 to 15.476 kJ.mol-1. HIGHLIGHTS ZnAl LDH intercalated by Keggin ion has been successfully synthesized by facile coprecipitation followed by ion exchange method The basal spacing of the intercalated ZnAl LDH increased up to 10.65 A The intercalated ZnAl LDH exhibited higher adsorption capacity for malachite green dye removal compared with the original ZnAl LDH

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