scholarly journals Decolorization of Malachite green dye by Stenotrophomonas maltophilia a compost bacterium

2021 ◽  
Vol 45 (1) ◽  
Author(s):  
Vasudhaudupa Alaya ◽  
Rajesh Kumar Kodi ◽  
Earanna Ninganna ◽  
Balakrishna Gowda ◽  
M. B. Shivanna
Keyword(s):  
Malachite Green ◽  
Stenotrophomonas Maltophilia ◽  
Dye Degradation ◽  
Uv Spectroscopy ◽  
Pcr Amplification ◽  
Rrna Gene ◽  
Malachite Green Dye ◽  
Before And After ◽  
The Media ◽  
Bacterial Treatment

Abstract Background The release of triphenylmethane dyes, like malachite green (MG) and crystal violet (CV), into the environment is a cause of concern due to its toxicity, mutagenicity and carcinogenicity. Result A bacterial strain that is capable of decolorizing both dyes was isolated from the composted neem oil-seed cake. The strain was characterized as Stenotrophomonas maltophilia based on the 16S rRNA gene sequence and designated as isolate TPMD-1. The kinetic study of the dye degradation revealed the efficiency of the above isolate to degrade MG. The effect of substrate concentration, pH, temperature, and agitation on the decolorization of MG by the isolate was also studied. The MG degradation rate was slightly more in neutral pH at 28–30 °C and 150 rpm. The UV-spectroscopy, HPLC, and FTIR analyses of the dye sample before and after bacterial treatment revealed the high ability of S. maltophilia TPDM-1 in the removal of MG from the media. The genetic snapshot of the isolate by PCR amplification and sequencing showed the presence of genes 'lac’ and ‘tmr’ that codes for laccase and triphenylmethane reductase. Conclusion This study presented the first report of Stenotrophomonas maltophilia in the degradation and detoxification of MG dye by oxidoreduction, which could be used for the bioremediation of aquatic environments contaminated by MG.

Photo-catalytic Study of Malachite Green Dye Degradation Using Rice Straw Extracted Activated Carbon Supported ZnO Nano-particles

2020 ◽  
Vol 10 (6) ◽  
pp. 849-859
Author(s):  
Radwa A. El-Salamony ◽  
Abeer A. Emam ◽  
Nagwa A. Badawy ◽  
Sara F. El-Morsi
Keyword(s):  
Activated Carbon ◽  
Visible Light ◽  
Rice Straw ◽  
Malachite Green ◽  
Dye Degradation ◽  
Nano Particles ◽  
Oh Radicals ◽  
Impregnation Method ◽  
Photo Degradation ◽  
Malachite Green Dye

Objective: ZnO nanoparticles were synthesized using wet impregnation method, and activated carbon from rice straw (RS) prepared through chemical route. Methods: The nano-composites ZnO-AC series were prepared with different ZnO:AC ratio of 10, 20, 50, and 70% to optimize the zinc oxide nanoparticles used. The obtained composites were characterized by FE-SEM, XRD, SBET, and optical techniques then used for the photo-degradation of Malachite green dye (MG) under visible light. Results: It was found that 10ZnO-AC exhibited excellent visible light photo-catalytic performance. The ·OH radicals’ formation is matching with photo-activity of the prepared composites. The photo-degradation efficiency of MG increased from 63% to 93%, when the 10ZnO-AC photocatalyst amount was increased from 0.5 to 6 g/L. Conclusion: The GC-MS technique was used to analyze the intermediates formed; up to 15 kinds of chemicals were identified as the degradation products.

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 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 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.

Vanadium-Decorated Nickel Oxide Nanosheets for Photocatalytic Removal of Malachite Green Dye Using Visible Light

2019 ◽  
Vol 11 (10) ◽  
pp. 1410-1416 ◽  
Author(s):  
A. S. Basaleh
Keyword(s):  
Visible Light ◽  
Nickel Oxide ◽  
Malachite Green ◽  
Photocatalytic Performance ◽  
Dye Degradation ◽  
Weight Percent ◽  
Band Gap Energy ◽  
Bandgap Energy ◽  
Malachite Green Dye ◽  
Photocatalytic Removal

Nickel oxide (NiO) nanosheets were prepared using a hydrothermal method, and vanadiumdecorated nickel oxide nanosheets were prepared using a photoassisted deposition method. The NiO and vanadium-decorated nickel oxide (V @ NiO) photocatalysts were investigated by several techniques, including BET, XPS, PL, UV-Vis, XRD, and TEM. The results demonstrated that the NiO bandgap energy can be adjusted by adjusting the weight percent of decorated vanadium. Malachite green dye degradation under visible light conditions was chosen to measure the photocatalytic performance of the NiO and V @ NiO samples. Additionally, parameters that affect photocatalytic performance, such as the concentration of malachite green dye, dose of the photocatalyst and vanadium weight percent, were studied in detail. The outcomes reveal that V @ NiO samples have photocatalytic activity higher than that of NiO samples due to their ability to hinder the electron–hole recombination rate and decrease the band gap energy.

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