scholarly journals Activated Carbon Production from Agricultural Biomass Using Response Surface Method (RSM) for Cd (II) Removal

2014 ◽  
Vol 69 (3) ◽  
Author(s):  
Mutah Musa ◽  
Akira Kikuchi ◽  
Zaiton Abdul Majid ◽  
Jafariah Jaafar ◽  
Mohd Razman Salim
Keyword(s):  
Activated Carbon ◽  
Response Surface ◽  
Response Surface Method ◽  
Correlation Coefficients ◽  
Good Prospect ◽  
Surface Method ◽  
Model Equations ◽  
Optimized Conditions ◽  
Temperature Time

The production of activated carbon (AC) from sugarcane bagasse (SCB) was carried out using central composite design of response surface method to run a limited number of experiments with the possibility of revealing the interaction of three selected factors of temperature, time and nitrogen/steam flowrate at different levels. Two second order quadratic regression model equations were developed using statistical analysis with Design Expert® software. The models were used for the prediction of removal of Cd2+ and carbon yield. Correlation coefficients (R2) were 0.957 for removal and 0.985 for yield, showing the sufficiency of the model in predicting response within 13 experimental runs. Characterization of the product with optimal performance which was produced at 900oC, with nitrogen/steam flow of 100 mL/min and activation time of 30 minutes, was carried out. The performance showed this AC sample was able to remove 62.42% Cd2+ from an aqueous solution with concentration 2 mg/L within 2 hours at optimized conditions. Experimental results indicated that AC from SCB had good prospect for Cd2+ removal.

Optimization on Influencing Factors of Fracture Toughness of Corundum-Mullite Toughened by In Situ Synthesized Mullite Whiskers by Response Surface Methodology

2012 ◽  
Vol 581-582 ◽  
pp. 819-822 ◽  
Author(s):  
Bin Meng ◽  
Jin Hui Peng
Keyword(s):  
Fracture Toughness ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Response Surface Method ◽  
Sintering Temperature ◽  
Surface Method ◽  
Mullite Whiskers ◽  
Optimized Conditions ◽  
Addition Amount

The corundum-mullite was toughened by in-situ synthesized mullite whiskers and the process parameters influencing the fracture toughness of corundum-mullite, such as sintering temperature, addition amount of AlF3 and V2O5, were optimized by means of response surface method. Corundum-mullite with fracture toughness of 9.44 MPa.m-1/2 could be obtained under the optimized conditions, i.e. sintering temperature of 1400°C, 4.8 wt.% of AlF3 and 5.8 wt.% of V2O5. The results showed that it was feasible to prepare corundum-mullite toughened by in-situ synthesized mullite whiskers by the optimized parameters. In addition, an accurate model based on response surface method was proposed to predict the experimental results.

Optimization and mechanism of Acid Orange 7 removal by powdered activated carbon coupled with persulfate by response surface method

2019 ◽  
Vol 79 (6) ◽  
pp. 1195-1205 ◽  
Author(s):  
Xuxu Wang ◽  
Xuebin Hu ◽  
Chun Zhao ◽  
Zhihua Sun ◽  
Huaili Zheng ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Response Surface ◽  
Response Surface Method ◽  
Acid Orange 7 ◽  
Promoting Effect ◽  
Acid Orange ◽  
Carbon Reduction ◽  
Decolorization Rate ◽  
Surface Method ◽  
Initial Ph

Abstract In this study, powder activated carbon (PAC) utilized to activate peroxydisulfate (PDS) was investigated for decolorization of Acid Orange 7 (AO7). The results indicated a remarkable synergistic effect in the PAC/PDS system. The effect of PAC, PDS dosages and initial pH on AO7 decolorization were studied and the processes followed first-order kinetics. Response surface method with central composite design (CCD) model was utilized to optimize these three factors and analyze the combined interaction. The optimum condition for the decolorization rate of AO7 was analyzed as the following: PAC (0.19 g/L), PDS (1.64 g/L), and initial pH (4.14). Cl− and SO42− showed a promoting effect on AO7 decolorization while HCO3− had a slightly inhibiting effect. Quenching experiments confirmed that both sulfate and hydroxyl radicals were the oxidizing species, and the oxidation reaction occurred on the surface of PAC. The results of UV-vis spectrum with 100% decolorization rate and the 50% total organic carbon reduction indicated highly efficient decolorization and mineralization of AO7 in the PAC/PDS system. Finally, the recovery performance of PAC was studied and the result indicated PAC had poor reuse in reactivity.

scholarly journals Application of Response Surface Method for Preparation, Optimization, and Characterization of Nicotinamide Loaded Solid Lipid Nanoparticles

2018 ◽  
Vol 8 (2) ◽  
pp. 245-256 ◽  
Author(s):  
Molood Alsadat Vakilinezhad ◽  
Shima Tanha ◽  
Hashem Montaseri ◽  
Rassoul Dinarvand ◽  
Amir Azadi ◽  
...  
Keyword(s):  
Response Surface ◽  
Response Surface Method ◽  
Solid Lipid Nanoparticles ◽  
Lipid Nanoparticles ◽  
Solid Lipid ◽  
Surface Method

scholarly journals OPTIMIZATION OF COAGULATION PRETREATMENT OF A REAL DAIRY EFFLUENT USING A RESPONSE SURFACE METHOD

2019 ◽  
pp. 138-144
Author(s):  
Nadji Moulai-Mostefa ◽  
Radia Madjdoub
Keyword(s):  
Response Surface ◽  
Response Surface Method ◽  
Analysis Of Variance ◽  
Ferric Chloride ◽  
Aluminum Sulfate ◽  
Correlation Coefficients ◽  
Dairy Effluent ◽  
Surface Method

This paper proposes a pretreatment of a real dairy effluent by coagulation and decantation using two types of coagulants, aluminum sulfate (Al2(SO4)3) and ferric chloride (FeCl3). In order to optimize the best coagulation conditions leading to maximums of COD and turbidity removals, response surface method (RSM) was employed. The analysis of variance showed that the values of the correlation coefficients (R2) for the reduction of turbidity and COD were found equal respectively to 0.959 and 0.840, which gives an idea about the validity of the quadratic developed models and their predictive qualities. The results predicted by the models were 98.18 and 77.06% of turbidity and COD removals, at Al2(SO4)3 concentration of 1200mg/L and time of treatment of 38.57min. These results are in agreement with those obtained experimentally.

Response surface method to optimize the production and characterization of lipase from Penicillium verrucosum in solid-state fermentation

2007 ◽  
Vol 31 (2) ◽  
pp. 119-125 ◽  
Author(s):  
Aniela Pinto Kempka ◽  
Nadia Lamb Lipke ◽  
Thais da Luz Fontoura Pinheiro ◽  
Silvana Menoncin ◽  
Helen Treichel ◽  
...  
Keyword(s):  
Solid State ◽  
Response Surface ◽  
Response Surface Method ◽  
Solid State Fermentation ◽  
Penicillium Verrucosum ◽  
Surface Method

scholarly journals DETERMINING OPTIMIZED CONDITIONS FOR REMOVAL OF CHLOROPHYLL IN EXTRACTED LIQUID FROM NEEM LEAVES BY DISTILLED WATER BY RESPONSE SURFACE METHOD

2011 ◽  
Vol 14 (4) ◽  
pp. 36-42
Author(s):  
Do Van Vu ◽  
Nguyen Hong Nguyen ◽  
Tri Ly Minh Nguyen
Keyword(s):  
Response Surface ◽  
Response Surface Method ◽  
Ethanol Extract ◽  
Distilled Water ◽  
Surface Method ◽  
Neem Leaves ◽  
Initial Content ◽  
Almost All ◽  
Optimized Conditions ◽  
And Storage

Chlorophyll content in liquid ethanol extract of neem’s leaves has bad effect on quality and storage time of the extract. In this study, we tried to remove remaining chlorophyll in the liquid ethanol extract of neem’s leaves by distilled water. The results showed that after chlorophyll removing, the liquid extract still retained almost all the biological activity ingredients (limonoid). Three effecting factors, i.e., (i) The time to cool to precipitate chlorophyll in the extracted liquid, (ii) The initial content of chlorophyll; (iii) The ratio between the extracted liquid and distilled water added all affect chlorophyll removal efficiency, have been studied. The Response Surface Method (RSM) showed that, the optimal conditions for removing chlorophyll process, the ratio between extracted liquid and distilled water respectively is 16.8 μg/ml and 1.3 (13:10; v:v). The time to cool to precipitate chlorophyll in the extracted liquid didi not have significantly affect on the performance of the removing chlorophyll’s contents.

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