scholarly journals Catalytic Oxidation of Ponceau 4R in Aqueous Solution using Iron-impregnated Al-pillared Bentonite: Optimization of the Process

2021 ◽  
Vol 16 (3) ◽  
pp. 491-506
Author(s):  
Paula Andrea Henao-Aguirre ◽  
Iván Fernando Macías-Quiroga ◽  
Gloria Inés Giraldo-Gómez ◽  
Nancy Rocío Sanabria-González
Keyword(s):  
Aqueous Solution ◽  
Iron Concentration ◽  
Pillared Clay ◽  
Additional Advantage ◽  
Independent Variables ◽  
Toc Removal ◽  
Iron Leaching ◽  
Ponceau 4R ◽  
Central Composite ◽  
Open Access Article

The application of the Fenton-like process for the oxidation of an aqueous solution of Ponceau 4R dye, using an aluminum pillared clay impregnated with iron (Fe(wt%)/Al-PILC) as catalyst, was investigated. The Response Surface Methodology (RSM), based on a Central Composite Design (CCD) was used to evaluate and optimize the oxidation process of a Ponceau 4R solution. Three independent variables were studied in the experimental design: the amount of H2O2 expressed in multiples of times of stoichiometry dose, iron concentration incorporated by impregnation onto aluminum pillared clay (Fe(wt%)), and amount of catalyst (Fe(wt%)/Al-PILC). The response variables were decolorization and total organic carbon (TOC) removal. The significance of independent variables and their interactions were tested by means of analysis of variance (ANOVA), with a 95% confidence level. With low stoichiometric dose of H2O2 (0.96 and 1.54 times), medium amount of catalyst (374.4 and 391.3 mg) and high Fe concentration impregnated in pillared clay (9.3 and 7.7 wt%), the total decolorization and high TOC removal were achieved. Under multi-objective optimization conditions (3.0 times the stoichiometric dose of H2O2, 420 mg Fe(wt%)/Al-PILC and 5.5 wt% Fe impregnated in Al-PILC), it was possible to achieve 86.18% decolorization and 66.81% TOC removal after 5 h of reaction at 25 °C, with the additional advantage of showing an iron leaching of less than 0.10 mg/L. The established models' soundness is confirmed by a good fit between predictive models and experimental results. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

scholarly journals Catalytic Oxidation of Tartrazine in Aqueous Solution Using a Pillared Clay with Aluminum and Iron

2021 ◽  
Vol 16 (1) ◽  
pp. 76-87
Author(s):  
Ángel David Gálvez-Serna ◽  
Iván Fernando Macías-Quiroga ◽  
Gloria Inés Giraldo-Gómez ◽  
María Teresa Dávila-Arias ◽  
Nancy Rocío Sanabria-González
Keyword(s):  
Aqueous Solution ◽  
Atmospheric Pressure ◽  
Azo Dye ◽  
Pillared Clay ◽  
Mixed System ◽  
Peroxide Oxidation ◽  
Experimental Conditions ◽  
Toc Removal ◽  
Wet Peroxide Oxidation ◽  
Open Access Article

In this work, pillared bentonite with Al−Fe (Al−Fe−PILC) was synthesized and used as a heterogeneous Fenton-like catalyst in the oxidation of tartrazine azo-dye in an aqueous solution. The modification of bentonite with the Al-Fe mixed system in a concentrated medium, with ultrasound assisted intercalation was carried out, and the obtained catalyst was characterized by XRF, XRD, and N2 adsorption at 77 K. The oxidation of tartrazine with Al−Fe−PILC, using different amounts of H2O2, expressed as a multiple (1, 3, 6, and 9) of a stoichiometry amount required to completely oxidize the dye was evaluated. The reaction of catalytic wet peroxide oxidation (CWPO) of the dye with 400 mg of Al−Fe−PILC and 6 times the stoichiometric amount of H2O2 at 25 °C, reached 98.2±1.8% of decolorization, 51.9±1.9% of TOC removal and 71.5±1.8% of TN removal. Results of this study show that the oxidation of tartrazine increased with the amount of H2O2 up to a certain limit. This oxidation process can be considered as an alternative for treating wastewater containing azo-dye because the reaction takes place under mild experimental conditions (room temperature and atmospheric pressure). Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA  License (https://creativecommons.org/licenses/by-sa/4.0). 

scholarly journals Degradation of Pesticide Chlorothalonil by Visible Light-Responsive Photocatalyst Ferrioxalate and under Solar Irradiation

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Malay Chaudhuri ◽  
Hafizi Zuhali ◽  
Augustine Chioma Affam
Keyword(s):  
Aqueous Solution ◽  
Visible Light ◽  
Biological Treatment ◽  
Operating Conditions ◽  
Solar Irradiation ◽  
Molar Ratio ◽  
Optimum Operating ◽  
High Quantum Yield ◽  
Toc Removal ◽  
Central Composite

Ferrioxalate is a visible light-responsive photocatalyst. The solar ferrioxalate/ process has high degradation efficiency because ferrioxalate is able to absorb light strongly at longer wavelength and generates hydroxyl radical with high quantum yield. Degradation of pesticide chlorothalonil in aqueous solution by ferrioxalate/ under solar irradiation was examined. The optimum operating conditions for treatment of a 300 mg/L chlorothalonil aqueous solution were obtained by using the central composite design of the response surface methodology. Under the optimum operating conditions (/COD molar ratio 2.75, /Fe3+molar ratio 75, /C2H2O4molar ratio 37.5, reaction time 90 min, and pH 3), COD, NH3-N, and TOC removal of 75.71, 47.11, and 54.33%, respectively, was achieved and the biodegradability (BOD5/COD ratio) improved from zero to 0.42. Model prediction and actual removal were in close agreement (<4% error). The solar ferrioxalate/H2O2process is effective in pretreatment of the chlorothalonil aqueous solution for biological treatment.

Kaempferol Extraction from Cuscuta reflexa using Supercritical Carbon Dioxide and Separation of Kaempferol from the Extracts

2011 ◽  
Vol 7 (4) ◽  
Author(s):  
Pranabendu Mitra ◽  
Kyu -Seob Chang ◽  
Dae-Seok Yoo
Keyword(s):  
Supercritical Co2 ◽  
Extraction Process ◽  
Optimum Conditions ◽  
Supercritical Co2 Extraction ◽  
Independent Variables ◽  
Cuscuta Reflexa ◽  
Optimal Processing ◽  
Layer Chromatography ◽  
Temperature Time ◽  
Central Composite

Kaempferol, a strong antioxidant, was extracted from Cuscuta reflexa (a medicinal plant) using supercritical CO2 and separated using thin-layer chromatography, column chromatography and HPLC analysis. A rotatable central composite design was used to determine the influence of process variables and arrive at optimal processing conditions in the supercritical CO2 extraction process of kaempferol. The kaempferol yield was effectively modelled as a function of the independent variables (temperature, time and pressure). The kaempferol yield increased with the increasing of temperature and time and decreasing of pressure of the supercritical CO2 extraction process. The predicted kaempferol yield at the optimum point was 52.92 µg/g and the optimum conditions were 50.7°C for 132.6 min and 15.9 MPa.

scholarly journals Smart Starch-Gelatin Films Incorporated with Curcumin

2020 ◽  
Vol 36 (6) ◽  
pp. 1088-1095
Author(s):  
Le Thi Bich Nguyet ◽  
Vinh Tien Nguyen
Keyword(s):  
Acetic Acid ◽  
Food Packaging ◽  
Gelatin Film ◽  
Film Properties ◽  
Elongation At Break ◽  
Independent Variables ◽  
Gelatin Films ◽  
Film Forming ◽  
Central Composite Experimental Design ◽  
Central Composite

In this study, we developed a starch-gelatin film incorporated with synthesized curcumin to be used as a pH-sensitive smart material for food packaging. The film-forming mixture contained five components: starch, gelatin, glycerol, acetic acid and curcumin. The interactions of the components and their effects on the film properties were investigated by using response surface methodology with central composite experimental design. The results showed impacts of the contents of these components as independent variables on tensile strength, elongation at break, Young’s modulus and solubility of the films. The contents of starch, gelatin and glycerol significantly affect these properties, while acetic acid and curcumin do not (p<0.05). Also, it was shown that the incorporation of curcumin provided the film with the capacity to sense pH changes from neutral to basic (yellow at pH ≤ 8 and orange-red at pH ≥ 9).

Optimization of Furfural Production from Xylose by RSM Using Chromium Sulfate as Catalyst

2014 ◽  
Vol 881-883 ◽  
pp. 29-34
Author(s):  
Ye Zhang ◽  
Ming Qiang Chen ◽  
Jun Wang
Keyword(s):  
Strong Influence ◽  
Catalyst Loading ◽  
Response Analysis ◽  
Solid Residue ◽  
Independent Variables ◽  
Temperature Time ◽  
Surface Response Analysis ◽  
Central Composite ◽  
Chromium Sulfate ◽  
Furfural Production

Optimization of chromium sulfate catalyzed conversion conditions of xylose into furfural was studied by response surfacemethodology (RSM). A central composite design (CCD) was used to determine the effects of independent variables, including temperature (120-160°C), time (30-150min), catalyst loading (1-5mmol) and moles of xylose (2.5-12.5mmol) on furfural yield, xylose conversion and solid residue. The surface response analysis revealed that temperature, time, catalyst loading and moles of xylose had a strong influence on the furfural yield, whereas moles of xylose was found to be notsignificant for xylose conversion. The solid residue was affected by temperature, time and moles of xylose. The maximumpredicted furfural yield was 45.07% at temperature of 150°C, time of 12min, catalyst loading of 2 mmol and moles of xylose of 10mmol. Under this condition, xylose conversion could be reached 100%.

scholarly journals Optimization of Pectin Extraction from Nephrolepis biserrata Leaves Using Response Surface Methodology

2014 ◽  
Vol 625 ◽  
pp. 920-923 ◽  
Author(s):  
Halifah Pagarra ◽  
Roshanida Abd Rahman ◽  
Rosli Md. Illias ◽  
Nor Azah Ramli
Keyword(s):  
Response Surface Methodology ◽  
Optimum Condition ◽  
Central Composite Design ◽  
Galacturonic Acid ◽  
Dry Weight ◽  
Extraction Time ◽  
Extraction Condition ◽  
Degree Of Esterification ◽  
Independent Variables ◽  
Central Composite

A central composite design was employed to optimize the extraction of pectin from Nephrolepis biserrata leaves. The independent variables were pH (1.5 to 2.5), extraction time (60 to 120 minutes) and temperature (60oC to 100oC). The combined effect of these variables on yields of pectin was investigated. The results showed that the yield of extracted pectin ranged from 3.76% to 8.50% (w/w, based on dry weight of Nephrolepis biserrata leaves). The optimum condition for the yield of pectin extraction was predicted at pH (1.5), extraction time (76.25 minutes) and temperature (100oC). Under the optimum condition, the actual pectin yield was 8.18%, which was below the predicted extraction condition of 8.316 %. The characteristics were 47.52% galacturonic acid and 83.71% degree of esterification. Keyword: Nephrolepis biserrata leaves, Extraction, Pectin, RSM, Characterization.

scholarly journals Experimental data of a catalytic decolorization of Ponceau 4R dye using the cobalt (II)/NaHCO3/H2O2 system in aqueous solution

Data in Brief ◽  
2020 ◽  
Vol 30 ◽  
pp. 105463 ◽  
Author(s):  
Iván F. Macías-Quiroga ◽  
Edwin F. Rojas-Méndez ◽  
Gloria I. Giraldo-Gómez ◽  
Nancy R. Sanabria-González
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Ponceau 4R ◽  
H2o2 System

scholarly journals Carbon dots as absorbance promoter probes for detection of Cu(ii) ions in aqueous solution: central composite design approach

2018 ◽  
Vol 17 (2) ◽  
pp. 245-255 ◽  
Author(s):  
S. A. R. Shahamirifard ◽  
M. Ghaedi ◽  
M. Montazerozohori ◽  
A. Masoudiasl
Keyword(s):  
Aqueous Solution ◽  
Central Composite Design ◽  
Carbon Dots ◽  
Design Approach ◽  
Complexing Agent ◽  
Vis Spectroscopy ◽  
First Time ◽  
Central Composite ◽  
Determination Of Copper

In this work, the use of carbon dots (CDs) as a complexing agent and sensitizer in a polymeric matrix for determination of copper(ii) by UV-vis spectroscopy is reported for the first time.

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