scholarly journals Removal of Metronidazole residues from aqueous solutions based on magnetic multiwalled carbon nanotubes by response surface methodology and isotherm study

2020 ◽  
Vol 3 (03) ◽  
pp. 44-53
Author(s):  
Mohammad Reza Rezaei Kahkha ◽  
Gholamreza Ebrahimzadeh ◽  
Ahmad Salarifar
Keyword(s):  
Response Surface Methodology ◽  
Aqueous Solutions ◽  
Response Surface ◽  
Sewage Treatment ◽  
Pharmaceutical Products ◽  
Quadratic Equation ◽  
Equation Model ◽  
Maximum Adsorption Capacity ◽  
Multiwalled Carbon ◽  
Isotherm Study

Antibiotics and pharmaceutical products cannot remove by conventional sewage treatment. In this work, an effective adsorbent magnetic multiwalled carbon nanotube (Fe3O4@MWCNTs) was synthesized by co-precipitation of MWCNTs with Fe3O4 and used for removal of Metronidazole from aqueous solutions. Response surface methodology on central composition design (CCD) was applied for designing of experiments and building of models for Metronidazole removal before a determination by HPLC. Four factors including pH, the adsorbent dose, time, and temperature were studied and used for the quadratic equation model to the prediction of optimal points.  By solvent the equation and considering the regression coefficient (R2 =0.9997), the optimal points obtained as follows: pH =2.98; adsorbent dosage =2.16 g; time =22 min and temperature = 37.9 o C. The isotherm study of adsorption showed that the metronidazole adsorption on Fe3O4@MWCNTs follows the Langmuir model. The maximum adsorption capacity (AC) is 215 mg g-1 obtained from Langmuir isotherm.

scholarly journals Magnetic bentonite nanocomposite for removal of amoxicillin from wastewater samples using response surface methodology before determination by high performance liquid chromatography

2020 ◽  
Vol 3 (03) ◽  
pp. 25-31
Author(s):  
Mohammad Reza Rezaei Kahkha ◽  
Ali Faghihi Zarandi ◽  
Nahid Shafighi ◽  
Saeedeh Kosari ◽  
Batool Rezaei Kahkha
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
High Performance ◽  
Sewage Treatment ◽  
Pharmaceutical Products ◽  
Quadratic Equation ◽  
Equation Model ◽  
Maximum Adsorption Capacity ◽  
Multiwalled Carbon ◽  
Isotherm Study

Antibiotics and pharmaceutical products cannot remove by conventional sewage treatment. In this work, an effective adsorbent Magnetic Multiwalled Carbon nanotube (MMWCNTs) was synthesized by co-precipitation of MWCNTs with Fe3O4 and used for removal of Amoxicillin from aqueous solutions. Response surface methodology on Central Composition Design (CCD) was applied for designing of experiments and building of models. Four factors including pH, adsorbent dose, time, and temperature were studied and used for the quadratic equation model to the prediction of optimal points.  By solvent the equation and considering the regression coefficient (R2 =0.99) the optimal points obtained as follows: pH =2.98; adsorbent dosage =2.16 g; time =22 min and temperature = 37.88 o C. Isotherm study of adsorption showed that the adsorption of amoxicillin onto MMWCNTs follows the Langmuir model. The maximum adsorption capacity is 215 mg g-1 obtained from Langmuir isotherm. 

Optimization on Response Surface Methodology for Preparing V2O5 from Industrial Ammonium Metavanadate

2014 ◽  
Vol 33 (2) ◽  
pp. 155-160 ◽  
Author(s):  
Yuxiang Chen ◽  
Bin Zhang ◽  
Shenghui Guo ◽  
Jinhui Peng ◽  
Lei Guo ◽  
...  
Keyword(s):  
Weight Loss ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Calcination Temperature ◽  
Vanadium Pentoxide ◽  
Layer Structure ◽  
Quadratic Equation ◽  
Equation Model ◽  
Ammonium Metavanadate ◽  
Calcination Time

AbstractIn order to obtain the vanadium pentoxide, the process of vanadium pentoxide preparation by calcination from industrial ammonium metavanadate was further investigated. The effects of calcination temperature and calcination time were studied. The conditions of technique to prepare vanadium pentoxide in flakes by calcination from industrial ammonium metavanadate were optimized using a central composite design of response surface methodology. A quadratic equation model for field was built and effects of main factors and their corresponding relationships were obtained. The statistical analysis of the results showed that in the range studied, the rate of weight loss of the industrial ammonium metavanadate was significantly affected by the calcination temperature and calcination time. The results showed that the optimum conditions of ammonium metavanadate calcination were as follows: sample mass 15 g, calcination temperature 900 °C, calcination time 2.4 h, the rate of weight loss 85.1%. In addition, the sample was characterized by XRD and SEM. The SEM analysis and XRD showed the product was layer structure. According to results from analysis of variance, the value of the determination coefficient (R2 = 0.9417) indicates that the model was a good fit that 94.17% of the variation could be explained well by the model.

scholarly journals A rapid and efficient removal approach for degradation of metformin in pharmaceutical wastewater using electro-Fenton process; optimization by response surface methodology

2019 ◽  
Vol 80 (4) ◽  
pp. 685-694 ◽  
Author(s):  
Maryam Dolatabadi ◽  
Saeid Ahmadzadeh
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Removal Efficiency ◽  
Degradation Mechanism ◽  
Pharmaceutical Products ◽  
Oh Radicals ◽  
Order Kinetic ◽  
Pharmaceutical Wastewater ◽  
Efficient Removal ◽  
Solution Ph

Abstract Presence of emerging contaminants such as pharmaceutical products in aquatic environments has received high concern due to their undesirable effect on wildlife and human health. Current work deals with developing a treatment model based on the electro- Fenton (EF) process for efficient removal of metformin (MET) from an aqueous medium. The obtained experimental results revealed that over the reaction time of 10 min and solution pH of 3, the maximum removal efficiency of 98.57% is achieved where the value of MET initial concentration, current density, and H2O2 dosage is set at 10 mg.L−1, 6 mA.cm−2, and 250 μL.L−1, respectively, which is in satisfactory agreement with the predicted removal efficiency of 98.6% with the desirability of 0.99. The presence of radical scavengers throughout the mineralization of MET under the EF process revealed that the generation of •OH radicals, as the main oxidative species, controlled the degradation mechanism. The obtained kinetics data best fitted to the first order kinetic model with the rate constant of 0.4224 min−1 (R2 = 0.9940). The developed treatment process under response surface methodology (RSM) was employed for modeling the obtained experimental data and successfully applied for efficient removal of the MET contaminant from pharmaceutical wastewater as an adequate and cost-effective approach.

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