scholarly journals Application of Central Composite Design to the Photo Fenton Degradation of Methyl Orange Azo Dye Using Fe-Activated Carbon Catalyst

2020 ◽  
Vol 5 (8) ◽  
pp. 479-485
Author(s):  
Abubakar Muhammad ◽  
Ahmed Lawal Mashi
Keyword(s):  
Activated Carbon ◽  
Methyl Orange ◽  
Central Composite Design ◽  
Correlation Coefficients ◽  
Quadratic Model ◽  
Process Time ◽  
Optimum Reaction ◽  
Methyl Orange Concentration ◽  
Central Composite ◽  
Degradation Of Methyl Orange

Photo-fenton oxidation technique is one of the emerging oxidation processes explored in treatment of organic pollutants in aqueous solutions. This research is focused on utilization of Fe(II) loaded activated carbon and H2O2(aq) in a photofenton process to generate hydroxyl radicals that mineralize methyl orange dyes. Samples of activated carbon were treated with Fe(NO3)2(aq) and characterized using SEM, pHZPC, specific surface area and boehm’s titration. The degradation of methyl orange by the iron loaded activated carbon (Fe-Ac), via photo-Fenton process, was investigated in lab-scale defined by experimental design. Central composite design (CCD) was used to evaluate the effects of the five independent variables considered for the optimization of the oxidative process: time, FeAc dose, methyl orange concentration, pH and H2O2 concentrations. In the optimization, the correlation coefficients (R2 ) for the quadratic model was 0.9941. Optimum reaction conditions were obtained at pH = 3, catalyst dose = 0.1 mg/100ml, H2O2 = 0.62ml, methyl orange concentration = 5mg/l and time = 30 minutes.

scholarly journals Optimization of Arsenic Adsorption onto Cativated Carbon Dreived from Potato Peel Using Response Surfase Methodology

2019 ◽  
Vol 7 (2) ◽  
Author(s):  
Akram A. Haji ◽  
Nidhal M.Sh. Mohammed
Keyword(s):  
Activated Carbon ◽  
Central Composite Design ◽  
Adsorption Capacity ◽  
Chemical Activation ◽  
Arsenic Concentration ◽  
Interactive Effects ◽  
Quadratic Model ◽  
Maximum Adsorption Capacity ◽  
Potato Peel ◽  
Central Composite

The present study was designed to optimizing the adsorption of As (V) onto potato peel derived activated carbon (MPP-AC) by employing response surface method and central composite design. Adsorbent of cheap and locally available potato residue was produced based on chemical activation with H3PO4 subsequently carbonization to produce the porous activated carbon. The individual and interactive effects of five variables including initial arsenic concentration, temperature, time, dosage amount and pH of the medium were investigated. Based on the statistic analysis (ANOVA), the quadratic model was developed associating the adsorption capacity (qe). The optimum conditions were obtained of 9.98 mg L-1 of initial As (V) concentration, 28 °C of temperature, 39.7 min of time, 0.97 g of adsorbent dose and 7.3 of pH. The maximum adsorption capacity was 0.27 mg g-1 and 76.5% removal efficiency. The equilibrium isotherms and kinetic studies for estimating the mechanism of process demonstrated a good fit to Langmuir model and the pseudo-second order, respectively. The results of this study showed that the feasibility of central composite design for control adsorption process and indicated the use of activated carbon of potato residue have important implications for As (V) removal.

Kinetics Studies for Catalytic Oxidation of Methyl Orange over the Heterogeneous Fe/Beta Catalysts

2013 ◽  
Vol 807-809 ◽  
pp. 361-364
Author(s):  
Fang Guo ◽  
Jun Qiang Xu ◽  
Jun Li
Keyword(s):  
Activation Energy ◽  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Methyl Orange ◽  
Incipient Wetness Impregnation ◽  
Kinetics Studies ◽  
Optimum Reaction ◽  
Catalyst Dosage ◽  
Oxidation Degradation ◽  
Degradation Of Methyl Orange

The Fe/Beta catalysts were prepared by conventional incipient wetness impregnation. The catalysis oxidation degradation of methyl orange was carried out in catalyst and H2O2 process. The results indicated that the catalyst and hydrogen peroxide were more benefit to degradation of methyl orange. The reaction condition was optimized. The optimum reaction process was as follow: iron amount of catalyst was 1.25%, the catalyst dosage and H2O2 concentration was 1 mg/L and 1.5 mg/L, and reaction temperature was 70 °C. The apparent activation energy (65 KJ/mol) was obtained according to the arrhenius formula, which was benefit to study the reaction mechanism.

Simultaneous ultrasonic-assisted removal of malachite green and safranin O by copper nanowires loaded on activated carbon: central composite design optimization

RSC Advances ◽  
2015 ◽  
Vol 5 (70) ◽  
pp. 57021-57029 ◽  
Author(s):  
Mostafa Roosta ◽  
Mehrorang Ghaedi ◽  
Arash Asfaram
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Central Composite Design ◽  
Design Optimization ◽  
Malachite Green ◽  
Copper Nanowires ◽  
Ultrasonic Assisted ◽  
Ultrasound Assisted ◽  
Safranin O ◽  
Central Composite

The present study investigates the simultaneous ultrasound-assisted adsorption of malachite green (MG) and safranin O (SO) dyes from aqueous solutions by ultrasound-assisted adsorption onto copper nanowires loaded on activated carbon (Cu-NWs-AC).

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