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Wyszukujesz frazę "response surface methodology" wg kryterium: Temat


Tytuł:
Optimization of microwave-assisted extraction of phenolic compounds from ginger (Zingiber officinale Rosc.) using response surface methodology
Autorzy:
Huyen, T.T.
Quoc, L.P.T.
Powiązania:
https://bibliotekanauki.pl/articles/2049060.pdf
Data publikacji:
2020
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
antioxidant
extraction
ginger
microwave
phenolic compounds
response surface methodology (RSM)
antyoksydacja
ekstrakcja
imbir
promieniowanie mikrofalowe
związki fenolowe
response surface methodology RSM (metoda powierzchni odpowiedzi)
Opis:
Introduction: Ginger (Zingiber officinale Rosc.) is a common spice and precious herbal plant in Vietnam. It contains many bioactive compounds, especially phenolic compounds useful for human health. Hence, the extraction and application of these compounds in medical technology are necessary. Objective: The goal of this study is to determine the optimal extraction conditions with the assistance of microwave, for instance solvent/material ratio (ml/g), solvent concentration (%, v/v) and extraction time, on the extraction yield of ginger rhizome, such as total polyphenol content (TPC) and antioxidant capacity (AC). Methods: The dried sample was extracted by microwave-assisted extraction (MAE). TPC and AC of received extract were measured by the Folin-Ciocalteu method and phenanthroline assay. The optimization process used response surface methodology (RSM) (Central composite face design, CCF) with major influencing factors including solvent concentration, solvent/material ratio and extraction time. Results: The results showed that the optimal extraction conditions were the ethanol concentration of 60%, ethanol/material ratio of 48.6/1 (ml/g), extraction time of 1 minute. Conclusion: The maximum TPC and AC peaked at 27.89±1.99 mg GAE/g dry matter and 12.24±0.04 mmol Fe/g dry matter (DM) at optimal extraction conditions. Besides, some factors strongly affected the extraction yield and interacted together.
Źródło:
Herba Polonica; 2020, 66, 2; 19-27
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response surface methodology for cobalt removal from aqueous solutions using Isparta pumice and zeolite 4A adsorbents
Autorzy:
Çiçek, E.
Cojocaru, C.
Zakrzewska-Trznadel, G.
Jaworska, A.
Harasimowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/146766.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
zeolite
Isparta pumice
adsorption
radioactive waste
cobalt ions
response surface methodology
Opis:
In this study, the adsorption of non-radioactive cobalt ions from aqueous solutions onto Isparta pumice and zeolite 4A sorbents was investigated. Both adsorbent materials have been activated at 873 K for 2 h prior to adsorption experiments in batch mode. The maximum removal efficiencies of 90% and 99% have been obtained experimentally using Isparta pumice and zeolite 4A, respectively. In addition, the experiments with radioactive 60Co were performed to test zeolite ability to remove radioactive compounds. Likewise, the response surface methodology (RSM) has been applied to develop the predictive regression models to describe the adsorption of cobalt and radiocobalt ions onto zeolite 4A and Isparta pumice. The results indicated that zeolite 4A as well as Isparta pumice could be used as the efficient sorption materials for cobalt and radiocobalt ions removal.
Źródło:
Nukleonika; 2008, 53, suppl. 2; 121-128
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Ultrasound Treatment of Beverage from Mango and Carrot with Added Turmeric Using Response Surface Methodology
Autorzy:
Lopez-Martinez, Leticia X.
Campos-Gonzalez, Nill
Zamora-Gasga, Victor M.
Domínguez-Avila, Jesús A.
Pareek, Sunil
Villegas-Ochoa, Mónica A.
Sáyago Ayerdi, Sonia G.
Gonzalez-Aguilar, Gustavo A.
Powiązania:
https://bibliotekanauki.pl/articles/2159268.pdf
Data publikacji:
2022-09-05
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
antioxidant capacity
bioactive compounds
D-optimal design
response surface methodology
ultrasound
Opis:
The effect of ultrasound treatment (UT) on a beverage from mango pulp and carrot juice with added turmeric powder on total soluble phenolic content (TSP), total carotenoid content (TC) and antioxidant capacity (AOC) was evaluated. Response surface methodology (RSM) was applied to obtain the optimal formulation of the beverage. The AOC was assigned as a response variable in addition to TSP and TC. Mathematical modeling showed that the formulation with 35% (v/v) of mango pulp, 10% (v/v) of carrot juice, and 0.7% (w/v) of turmeric powder, yielded the highest values of TSP, TC, and AOC. The beverages were subjected to different ultrasound conditions with varying exposure times (ET), sonication amplitudes (SA), and pulse cycles (PC) to obtain the highest values for response variables. Statistical modeling showed that a UT at 21 min ET, 100% SA, and 0.7 s PC, increased TSP, Trolox equivalent antioxidant capacity (TEAC), and ferric reducing antioxidant power (FRAP) by 15.5%, 45.1%, and 15.9%, respectively. Seven phenolic acids, three curcuminoids, five flavonoids, and a xanthonoid were identified in the beverages. The quantities of 3,4-dihydroxybenzoic acid, gallic acid, chlorogenic acids, (+)-catechin, quercetin, kaempferol, (–)-gallocatechin gallate, and mangiferin were higher in the UT beverage compared to the control, suggesting their release from cell-wall structures as a result of UT.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2022, 72, 3; 287-296
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation and sensitivity analysis of entropy generation of Al2O3/H2O nanofluid in turbulent regime using response surface methodology
Autorzy:
Fadodun, Olatomide G.
Olokuntoye, Bolanle A.
Salau, Ayodeji O.
Amosun, Adebimpe A.
Powiązania:
https://bibliotekanauki.pl/articles/240104.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
entropy production
Reynolds number
response-surface-methodology
nanofluid
single-phase flow
Opis:
This work investigates the effect of Reynolds number, nanoparticle volume ratio, nanoparticle size and entrance temperature on the rate of entropy generation in Al2O3 /H2O nanofluid flowing through a pipe in the turbulent regime. The Reynolds average Navier-Stokes and energy equations were solved using the standard k-ε turbulent model and the central composite method was used for the design of experiment. Based on the number of variables and levels, the condition of 30 runs was defined and 30 simulations were run. The result of the regression model obtained showed that all the input variables and some interaction between the variables are statistically significant to the entropy production. Furthermore, the sensitivity analysis result shows that the Reynolds number, the nanoparticle volume ratio and the entrance temperature have negative sensitivity while the nanoparticle size has positive sensitivity.
Źródło:
Archives of Thermodynamics; 2020, 41, 2; 119-146
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of Boron-Doped Diamond and Platinum Anodes in the Three-Compartment Electrochemical Pretreatment of Stabilized Landfill Leachate – Response Surface Methodological Approach
Autorzy:
Bagastyo, Arseto Yekti
Anggrainy, Anita Dwi
Rosyidah, Badriyah
Powiązania:
https://bibliotekanauki.pl/articles/2202300.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
boron-doped diamond
electrochemical process
leachate pretreatment
platinum
response surface methodology
Opis:
Stabilized landfill leachate contains high fractions of refractory organics that cannot be effectively degraded by simple biological or physicochemical treatment. Thus, primary treatment was required to improve biodegradability and enhance treatment efficiency. This study investigated the role of Boron-Doped Diamond (BDD) and platinum (Pt) anodes at a current density of 29.2 and 33.3 mA/cm2 in the electrochemical processes for the pretreatment of stabilized leachate. A three-compartment electrochemical reactor was used in the research to enhance the removal of ionic pollutants. The pollutants were measured as total dissolved solids (TDS), chemical oxygen demand (COD), ammonium-nitrogen (NH4–N), and nitrite (NO2–). The reactor performance was then analyzed using a regular two-level factorial design. The results showed that the electrochemical process effectively removed organic and inorganic pollutants. The highest removal was obtained at 33.3 mA/cm2 using the BDD, measured around 48, 82, 60, and 79% for TDS, COD, NH4–N, and NO2–, respectively. Meanwhile, the specific energy consumption for COD removal was estimated to reach 1.5 and 1.55 Wh/g for BDD and Pt, respectively. These results imply that the type of anodes and applied current densities significantly influence the treatment efficiency.
Źródło:
Journal of Ecological Engineering; 2022, 23, 12; 50--60
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extraction, Chemical Composition and Antidiabetic Potential of Crude Polysaccharides from Centella asiatica (L.) Urban
Autorzy:
Li, Meng
Shahid, Muhammad
Zhang, Xiaobin
Law, Douglas
Mackeen, Mukram M.
Teh, Arnida H.
Najm, Ahmad A.
Fazry, Shazrul
Othman, Babul A.
Powiązania:
https://bibliotekanauki.pl/articles/31341117.pdf
Data publikacji:
2024-05-24
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
alcohol insoluble residue
antidiabetic
mineral elements
monosaccharide composition
response surface methodology
Opis:
The global prevalence of diabetes mellitus (DM) is escalating, posing a significant challenge to human healthcare systems. In the present study, mineral and monosaccharide compositions, and antidiabetic potential of polysaccharide fractions separated from Centella asiatica (L.) leaves (CAL) were assessed. Initial single-factor experiments identified key extraction parameters, further optimized through response surface methodology (RSM) with optimal conditions determined as a liquid-to-solid ratio of 24.43:1 (mL/g), extraction time of 60.76 min, and a temperature of 83.31℃. Alcohol insoluble residue (AIR) extraction yielded three crude polysaccharide fractions (P50, P70, and P90). P50 was obtained with the highest yield (14.31%) and exhibited the highest content of total sugars and uronic acids (68.01 and 24.28 g/100 g, respectively). Calcium, magnesium, and manganese were dominant minerals in P50 and P70. Monosaccharide composition analysis via high-performance liquid chromatography (HPLC) demonstrated enrichment of galacturonic acid, galactose, and arabinose in P50 and P70. Furthermore, both fractions (P50 and P70) exhibited dose-dependent inhibitory effects on α-amylase and α-glucosidase. At 5 mg/mL, P50 caused 68.3% α-amylase inhibition and 62.3% α-glucosidase inhibition, while P70 triggered 46.8% and 34.1% inhibition, respectively. In conclusion, this study is the first to provide valuable insights into optimizing CAL extraction conditions. Potential utilization of polysaccharide fractions obtained from CAL as components for formulating functional foods can be explored in the future.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2024, 74, 2; 177-187
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of polycondensation process of alkyd resin synthesis from modified Picralima nitida seed oil suitable for surface coating of metal
Autorzy:
Ezeugo, J. O.
Powiązania:
https://bibliotekanauki.pl/articles/1076136.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Artificial Neural Network
Picralima nitida seed oil
Response surface methodology
alkyd resin
Opis:
The potential of synthesizing an air drying alkyd resin through polycondensation of non-drying Picralima nitida seed oil (PNSO) was investigated. The structural elucidation of the raw PNSO, de-saturated PNSO and PNSO based alkyd resin were evaluated using FTIR. Design matrix and response Surface methodology were used to model the process variables. Artificial neural network was further used to examine the sensitivity analysis of the studied process variables. The results obtained showed that modified PNSO has high drying rate in the presence of drying agent, exhibit excellent adhesion, abrasion and chemical properties. Optimum responses of 82% conversion, viscosity of 269 cp and molecular weight average of 4434 g/mol were predicted at a temperature of 260 ºC, time of 134 mins, oil ratio of 0.286, catalyst concentration of 0.062 wt and a stirring rate of 595rpm. Correspondent experimental results using the same optimal conditions gave optimum conversion of 83% of alkyd resin, viscosity of 271cp and MWA of 4440 g/mol.
Źródło:
World Scientific News; 2019, 116; 62-90
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First report on implementation of response surface methodology for the biodegradation of textile industrial effluents by Coniophora puteana IEBL-1
Autorzy:
Mahmood, Raja T.
Asad, Muhammad J.
Asgher, Muhammad
Zainab, Tayyaba
Zafar, Mudassar
Hadri, Saqib H.
Ali, Imran
Zaman, Nasib
Wattoo, Feroza H.
Powiązania:
https://bibliotekanauki.pl/articles/204720.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Coniophora puteana IEBL-1
response surface methodology
biodegradation
laccase
lignin peroxidase
diphenylamine
Opis:
The current study was aimed to evaluate the industrial effluents biodegradation potential of an indigenous microorganism which reduced water pollution caused by these effluents. In the present study biodegradation of three textile industrial effluents was performed with locally isolated brown rot fungi named Coniophora puteana IEBL-1. Response Surface Methodology (RSM) was employed under Box Bhenken Design (BBD) for the optimization of physical and nutritional parameters for maximum biodegradation. Quality of treated effluents was checked by study of BOD, COD and analysis through HPLC. Three ligninolytic enzymes named lignin peroxidase, manganese peroxidase and laccase were also studied during the biodegradation process. The results showed that there was more than 85% biodegradation achieved for all three effluents with decrease in Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) below the recommended values for industrial effluent i.e. 80 mg/L for BOD and 220 mg/L for COD after optimization of nutritional parameters in the second stage. Analysis of samples through HPLC revealed the formation of less toxic diphenylamine, 3-methyldiphenylamine and N-methylaniline after treatment. The ligninolytic enzymes assays confirmed the role of lignin peroxidase (LiP), manganese peroxidase (MnP) and laccase in biodegradation process. Lignin peroxidase with higher activity has more contribution in biodegradation of effluents under study. It can be concluded through the results that Coniophora buteana IEBL-1 is a potential fungus for the treatment of industrial effluents.
Źródło:
Archives of Environmental Protection; 2019, 45, 4; 48-59
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study of face milling of D2 steel using AL2O3 based nanofluid minimum quantity lubrication and minimum quantity lubrication
Autorzy:
Ahsan Ul Haq, Muhammad
Khan, Aqib Mashood
Gong, Le
Xu, Tao
Meng, Longhui
Hussain, Salman
Powiązania:
https://bibliotekanauki.pl/articles/103049.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
face milling
temperature
response surface methodology
steel
temperatura
metodologia powierzchni odpowiedzi
stal
Opis:
This study aims to investigate the effects of process parameters: feed, depth of cut and flow rate, on the temperature during face milling of the D2 tool steel under two different lubricant conditions, Minimum Quantity Lubrication (MQL) and Nano fluid Minimum Quantity Lubrication (NFMQL). Deionized water with the flow rate range 200–400 ml/h was used in MQL. 2% by weight concentration of Al2O3 nano particles with deionized water as a base fluid used as NFMQL with the same flow rate. Response surface methodology RSM central composite design CCD was used to design experiment run, modeling and analysis. ANOVA was used for the adequacy and validation of the system. The comparison shows that NFMQL condition reduced temperature more efficiently during machining.
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 1; 99-105
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure acid leaching of sphalerite concentrate. Modeling and optimization by response surface methodology
Autorzy:
Guler, E.
Powiązania:
https://bibliotekanauki.pl/articles/110475.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
pressure leaching
sphalerite concentrate
optimization
response surface methodology
central composite rotatable design
Opis:
The zinc leaching from sphalerite concentrate using oxygen under pressure in sulfuric acid solution was primarily studied and evaluated. The effects of important leaching parameters such as oxygen partial pressure, temperature, solid/liquid ratio and leaching time on leaching efficiency, Zn concentration and Fe extraction were investigated. Response surface methodology based on central composite rotatable design technique was used to optimize the leaching process parameters in order to obtain a suitable leach solution with high Zn leaching efficiency considering further processes such as precipitation of contaminating metal ions and electrolysis. The optimum leaching condition for maximum Zn leaching efficiency and Zn concentration with minimum Fe extraction was determined as follows: oxygen partial pressure of 12 bars, temperature of 150 °C, solid/liquid ratio of 0.20 and leaching time of 89.16 minutes. The achieved experimental results for Zn leaching efficiency, Zn concentration and Fe extraction under the optimum conditions were as 94%, 80 g/dm3 and 8.1% respectively. The experimental results corresponded well with the predicted results of quadratic polynomial models.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 479-496
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cactus and Holm Oak Acorn for Efficient Textile Wastewater Treatment by Coagulation-Flocculation Process Optimization Using Box-Benhken Design
Autorzy:
Adachi, Abderrazzak
Soujoud, Radouane
El Ouadrhiri, Faiçal
Tarik, Moubchir
Hmamou, Anouar
Eloutassi, Noureddine
Lahkimi, Amal
Powiązania:
https://bibliotekanauki.pl/articles/24202904.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
coagulation-flocculation
textile wastewater
response surface methodology
decolorization
cactus
holm oak acorn
Opis:
In this study, the effectiveness of using natural bio-coagulants and bio-flocculants to treat textile wastewater through the coagulation-flocculation method was examined. These bio-based agents have several advantages over chemical agents, including biodegradability, natural abundance, low toxicity, and low cost. A bio-coagulant (holm oak acorn (HOA)) and a bio-flocculant (cactus juice) were used to investigate the capacity for turbidity removal and decolorization of textile wastewater. The UV spectrophotometer was used to characterize the discharges before and after treatment, and the chemical oxygen demand (COD) and biological oxygen demand (BOD5) levels were calculated. Box-Behnken design (BBD) coupled with response surface methodology (RSM) were utilized to optimize the process and reduce turbidity and decolorization in textile wastewater. The obtained results show that under the optimal conditions (0.5 g•L-1 of HOA, 15 mL•L-1 of cactus juice, and a pH of 7), decolorization and turbidity removal were achieved at 69% and 90%, respectively. This study demonstrates the potential of using bio-coagulants and bio-flocculants in the treatment of textile wastewater.
Źródło:
Journal of Ecological Engineering; 2023, 24, 6; 315--328
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and characterization of calcite for tannic acid adsorption: Optimization by response surface methodology coupled by Box-Cox transformation procedure
Autorzy:
Tangarfa, Mariam
Hassani, Naoul Semlali Aouragh
Alaoui, Abdallah
Powiązania:
https://bibliotekanauki.pl/articles/1447160.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
calcite
tannic acid
adsorption parameters
optimization
Response Surface Methodology
Box-Cox transformation
Opis:
Calcite depression is the most effective physicochemical process to valorize fluorine mineral. This process is achieved by adsorption of tannic acid, as the commonly used reagent, onto calcite. Adsorption investigation is very important in mineral processing. The present work focuses on optimization of physicochemical parameters of tannic acid adsorption onto calcite. Experimental study is carried out by a response surface methodology based on Box-Behnken design. Obtained results are exploited to develop a statistical model. Analysis of variance and residuals are performed to check the significance of tested models. Among these models, Cox-Box model predicts very well the obtained experimental data. This model shows that initial tannic acid concentration and solution pH as well as their interactions are the most significant parameters. Optimal conditions are achieved using the obtained statistical model. The present investigation is an important preliminary step to better understand calcite flotation behavior using tannic acid as a depressant.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 3; 36-45
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ability of Response Surface Methodology to Optimize Photocatalytic Degradation of Amoxicillin from Aqueous Solutions Using Immobilized TiO2/Sand
Autorzy:
Sulaiman, Fadia A.
Alwared, Abeer I.
Powiązania:
https://bibliotekanauki.pl/articles/2086434.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
amoxicillin
solar photocatalyst
immobilized TiO2
sand
RSM
response surface methodology
kinetics
Opis:
The response surface method was applied to optimize operational factors in the solar photocatalytic process on the removal of Amoxicillin (AMOX) residues from aqueous solution using TiO2 immobilized on the sand as a catalyst. The results reveal that the degradation percentage of AMOX is 93.12%, when optimal conditions of pH=5, 75 mg/l of TiO2, 400 mg/l of H2O2, and 10 mg/l of AMOX concentration at 150 min irradiation time were used. Furthermore, the model’s expected response results have reasonable similarity with the actual data (R2 = 93.58%), demonstrating the efficiency of this method in making an accurate prediction. A second-order polynomial multiple regression model was used to evaluate the responses, which confirms that was a satisfactory adjustment with the achieved data through analysis of variance (R2 = 93.58%, R2adj = 91.48% and R2pred =89.68%). In addition, it is observed that the removal of undesirable compounds follows a pseudo-2nd order kinetic model with R2 = 0.9862. In conclusion, with the ease of usage of immobilized TiO2 and good photocatalytic efficiency, the findings showed the potential application to the antibiotics from an aqueous solution.
Źródło:
Journal of Ecological Engineering; 2022, 23, 5; 293--304
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing the mechanical properties of 3D-printed PLA-graphene composite using response surface methodology
Autorzy:
El Magri, A.
Vaudreuil, S.
Powiązania:
https://bibliotekanauki.pl/articles/2175742.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
PLA
graphene
composite
mechanical properties
response surface methodology
grafen
kompozyt
właściwości mechaniczne
Opis:
Purpose: This work aims to study the relationship between various processing parameters to fabricate PLA-graphene based 3D parts with high mechanical properties. The selected parameters in this study are known for their critical impact on the final properties of printed parts. Design/methodology/approach: Three key printing parameters are simultaneously studied in a systematic manner using central composite design (CCD). The selected printing parameters are printing temperature, printing speed, and layer thickness. Findings: Through a variance analysis, all tested printing parameters significantly impact the final properties of printed PLA-graphene’s parts. A response surface methodology (RSM) was also applied to analyse the results and to optimize the tensile and the flexural properties. According to this latter methodology, the optimum factor levels are found at 200°C printing temperature, 34.65 mm s-1 printing speed and 0.2 mm layer thickness. Research limitations/implications: Results indicate that layer thickness and printing speed are the dominant contributors to tensile and flexural properties. Originality/value: As one of the few polymers loaded with nanoparticles available, polylactic acid (PLA) reinforced graphene was selected in this study as a base material for FFF 3D printing process. A response surface methodology was applied to analyse the results and to maximize the tensile and flexural properties of 3D printed PLA-graphene composite.
Źródło:
Archives of Materials Science and Engineering; 2021, 112, 1; 13--22
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of Petroleum Refinery Wastewater by Graphite–Graphite Electro Fenton System Using Batch Recirculation Electrochemical Reactor
Autorzy:
Kassob, Ali Nadhum
Abbar, Ali Hussein
Powiązania:
https://bibliotekanauki.pl/articles/2202176.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
advanced oxidation process
COD removal
electro-Fenton
porous graphite
response surface methodology
Opis:
Water pollution and the lack of access to clean water are general global problems that result from the expansion of industrial and agricultural activities. Petroleum refinery wastewaters are considered as a major challenge to the environment and their treatment is mandatory. The present work investigated the removal of chemical oxygen demand (COD) from petroleum refinery effluents generated from the Al-Dewaniya petroleum refinery plant located in Iraq by utilizing a novel graphite–graphite electro-Fenton (EF) system. The electrochemical reactor was a tubular type with a cylindrical cathode made from porous graphite and concentric porous graphite rode acts as an anode. By adopting the response surface methodology (RSM), the impacts of different operating variables on the COD removal were investigated. The optimal conditions were a current density of 25 mA/cm2, FeSO4 concentration of 1.4 mM, and electrolysis time of 90 minutes, which resulted in the COD removal efficiency (RE%) of 99% at a specific energy consumption (SEC) of 10.34 kWh/kg COD. The results indicated that both current density and concentration of FeSO4 have a major impact on the elimination of COD, while time has a minor effect. The adequacy of the model equation was demonstrated by its high R2 value (0.987). The present work demonstrated that the graphite–graphite EF system could be considered as an effective approach for removing of COD from petroleum refinery wastewaters.
Źródło:
Journal of Ecological Engineering; 2022, 23, 10; 291--303
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł

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