scholarly journals Nonspontaneous and multilayer adsorption of malachite green dye by Acacia nilotica waste with dominance of physisorption

2017 ◽  
Vol 76 (7) ◽  
pp. 1805-1815 ◽  
Author(s):  
M. T. Amin ◽  
A. A. Alazba ◽  
M. Shafiq
Keyword(s):  
Malachite Green ◽  
Batch Process ◽  
Acacia Nilotica ◽  
Process Variables ◽  
Free Energy Of Adsorption ◽  
Multilayer Adsorption ◽  
Adsorption Reaction ◽  
Malachite Green Dye ◽  
Opposite Trend ◽  
Adsorption Data

Adsorption of the hazardous dye malachite green (MG) by Acacia nilotica (AN) waste was investigated. Batch process variables for the adsorption of MG by AN were optimized. The mechanisms involved in the adsorption of MG by AN were explored using isotherms and kinetic models. The thermodynamic parameters were calculated to determine the spontaneity and thermal nature of the MG adsorption reaction. The maximum equilibrium adsorption capacity of AN was found to be 113.26 mg/g at 30 °C. The MG adsorption data revealed that AN adsorbs MG by multilayer adsorption, as shown by the better fit of the data to the Freundlich and Halsey models (R2 = 0.99) rather than to the Langmuir model. Multilayer adsorption involves physisorption, which was confirmed by the E value (mean free energy of adsorption) of the Dubinin–Radushkevich model (6.52 kJ/mol). Surface diffusion was found to be the main driving force for MG adsorption by AN. The MG adsorption reaction was endothermic, based on the enthalpy, and was controlled by the entropy of the system in the T1 temperature range (30 to 40 °C), while the opposite trend was observed in the T2 range (40 to 50 °C). Moreover, MG adsorption by AN was found to be nonspontaneous at all temperatures.

Adsorption removal of malachite green dye from aqueous solution

2018 ◽  
Vol 34 (3) ◽  
pp. 427-453 ◽  
Author(s):  
Kshitij Tewari ◽  
Gaurav Singhal ◽  
Raj Kumar Arya
Keyword(s):  
Aqueous Solution ◽  
Malachite Green ◽  
Dye Removal ◽  
Low Cost ◽  
Agricultural Waste ◽  
Malachite Green Dye ◽  
Adsorption Removal ◽  
Adsorption Data ◽  
The Cost ◽  
Cost Feasibility

Abstract In this review, the state of the art on the removal of malachite green dye from aqueous solution using adsorption technique is presented. The objective is to critically analyze different adsorbents available for malachite green dye removal. Hence, the available recent literature in the area is categorized according to the cost, feasibility, and availability of adsorbents. An extensive survey of the adsorbents, derived from various sources such as low cost biological materials, waste material from industry, agricultural waste, polymers, clays, nanomaterials, and magnetic materials, has been carried out. The review studies on different adsorption factors, such as pH, concentration, adsorbent dose, and temperature. The fitting of the adsorption data to various models, isotherms, and kinetic regimes is also reported.

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.

Effective removal of malachite green dye from aqueous solution in hybrid system utilizing agricultural waste as particle electrodes

Chemosphere ◽  
2021 ◽  
Vol 273 ◽  
pp. 129634
Author(s):  
A. Annam Renita ◽  
Kilaru Harsha Vardhan ◽  
P. Senthil Kumar ◽  
P. Tsopbou Ngueagni ◽  
A. Abilarasu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Malachite Green ◽  
Hybrid System ◽  
Agricultural Waste ◽  
Malachite Green Dye ◽  
Effective Removal

scholarly journals Enhanced photocatalytic efficiency of hydrothermally synthesized g-C3N4/NiO heterostructure for mineralization of malachite green dye

2021 ◽  
Vol 11 ◽  
pp. 970-981
Author(s):  
Suresh Kumar Pandey ◽  
Manish Kumar Tripathi ◽  
V. Ramanathan ◽  
Pradeep Kumar Mishra ◽  
Dhanesh Tiwary
Keyword(s):  
Malachite Green ◽  
Photocatalytic Efficiency ◽  
Malachite Green Dye
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