Comparative study of central composite and Box-Behnken design for the optimization of malachite green dye adsorption onto Sal seed activated char

<div> <p>In this study, a four-factor five-level Central Composite Design (CCD) was applied to develop mathematical model and optimize process parameters for malachite green dye (MG) removal from aqueous solutions using sepiolite. The individual, combined, and quadratic effects of four experimental factors (initial pH of solution, contact time, initial dye concentration, and sepiolite dosage) on dye adsorption were studied. Based on the analysis of variance (ANOVA) results, the order of factors from high to low contribution on removal efficiency was found as  initial dye concentration, sepiolite dosage, initial dye concentration*initial dye concentration, sepiolite dosage*sepiolite dosage, and contact time with respect to sum of squares. Optimization results showed that the optimal settings for significant experimental factors were initial dye concentration= 77 mg l<sup>-1</sup>, sepiolite dosage= 26 g l<sup>-1</sup>, and contact time= 42 min. At this setting, predicted maximum removal efficiency was over 99%. </p> </div> <p> </p>

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Process Optimization Studies of Malachite Green dye Adsorption onto Eucalyptus (Eucalyptus globulus ) Wood Biochar using Response Surface Methodology

Oriental Journal Of Chemistry ◽

10.13005/ojc/320534 ◽

2016 ◽

Vol 32 (5) ◽

pp. 2621-2631 ◽

Cited By ~ 1

Author(s):

V. Singh ◽

A. Soni ◽

R. Singh

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Malachite Green ◽

Process Optimization ◽

Eucalyptus Globulus ◽

Dye Adsorption ◽

Malachite Green Dye

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Decolorization of Malachite green dye from wastewater by Populus deltoides: three-level Box–Behnken design optimization, equilibrium, and kinetic studies

Journal of Water Reuse and Desalination ◽

10.2166/wrd.2015.085 ◽

2015 ◽

Vol 5 (3) ◽

pp. 250-263 ◽

Cited By ~ 2

Author(s):

Afsaneh Shahbazi ◽

Farnoosh Bagheri Zonoz

Keyword(s):

Malachite Green ◽

Populus Deltoides ◽

Kinetic Studies ◽

Second Order ◽

Coefficient Of Determination ◽

P Value ◽

Box Behnken Design ◽

Malachite Green Dye ◽

Initial Ph ◽

Adsorbent Dose

Decolorization of Malachite green in aqueous solution by adsorption onto Populus deltoides sawdust (PSD) was optimized through a four-factor, three-level Box–Behnken design in response surface methodology. The influences of four independent variables such as initial pH of solution (3–7), dye concentration (50–300 mg/L), adsorbent dose (0.2–2 g/L), and temperature (23–50 °C) were studied to optimize the condition of dye removal. A natural log transformation was suggested by the Box–Cox plot in order to enhance the model significance. Regression analysis showed good fit of the experimental data to the second-order polynomial model with high coefficient of determination values (R2 = 0.996; Radj.2 = 0.9913; Rpred.2 = 0.9769), F-value of 213.03, and p-value of <0.0001 (α = 0.05). Under optimum values of all the four variables, viz., pH of 6.02, initial dye concentration of 262.6 mg/L, adsorbent dose of 0.23 g/L and temperature of 30.3 °C, the maximum uptake (qe) was noted to be 920.9 mg/g. The experimental equilibrium adsorption data were fitted well to the Langmuir isotherm model (R2 = 0.9949). Kinetic studies revealed that adsorption followed pseudo-second order. It was found that PSD is suitable for reuse four times in successive adsorption-desorption cycles with loss of 25.2% in adsorption capacity.

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