Optimized Response Surface Methodology for Adsorption of Dyestuff from Aqueous Solution

Arunachala, Raghavendra; Annadurai, G.

doi:10.3923/jest.2011.65.72

Cited by 33 publications

(8 citation statements)

References 23 publications

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“…where x i is the value of the independent variable, L i is the value of variable i, L o is the value at the central point, and ΔL is the step. e 28 experiments represent a system which translates the quadratic model (equation ( 4)) to study the interactions between the variables [30].…”

Section: Response Surface Methodology and Statistical Analysis Of The...mentioning

confidence: 99%

Optimized Removal of Hydroquinone and Resorcinol by Activated Carbon Based on Shea Residue (Vitellaria paradoxa): Thermodynamics, Adsorption Mechanism, Nonlinear Kinetics, and Isotherms

Amola

Kamgaing

Tagne

et al. 2022

Journal of Chemistry

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The present work demonstrates the adsorption of hydroquinone (HQ) and resorcinol (R) by activated carbon based on shea residue (Vitellaria paradoxa). The adsorbent was prepared chemically by impregnation with sulfuric acid and coded by the acronym CAK-S. The central composite design (CCD) was used to optimize the main factors that influence the adsorption of HQ or R by activated carbon such as the initial concentration, the pH of the solution, the contact time, and the mass of the carbon on the expected response, which is the adsorbed quantity of the target pollutants. The optimal conditions obtained from the statistical analysis are as follows: concentration of 158 mg/L, pH 3, time of 120 min, and mass of 50 mg for the adsorption of HQ and concentration of 180 mg/L, pH 3, time of 86 min, and mass of 118 mg for the adsorption of R. The maximum quantities of HQ and R adsorbed are 45.02 mg/g and 33.65 mg/g, respectively. The analysis of variance (ANOVA) showed a good relationship between the variables involved with the coefficients of determination R2 = 98.69% for the adsorption of hydroquinone and R2 = 90.55% for that of resorcinol, which means that the model is more suitable to express the adsorbed amount according to the four optimized parameters. The experimental data obtained under these optimal conditions were simulated with two and three parameter nonlinear isotherm models as well as kinetic models. The results show that Elovich kinetic model better describes the adsorption of HQ and R, indicating chemisorption with heterogeneous active sites on the surface of CAK-S. Temkin’s two-parameter model shows that adsorption occurs on heterogeneous surfaces with a nonuniform adsorption energy distribution at the surface and Sips’s three-parameter model confirms the heterogeneity of the surface with a localized adsorption of HQ or R by CAK-S. The thermodynamics study has shown that the adsorption is endothermic ( Δ H 0 > 0 ) and spontaneous ( Δ G 0 < 0 ).

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Section: Response Surface Methodology and Statistical Analysis Of The...mentioning

confidence: 99%

Optimized Removal of Hydroquinone and Resorcinol by Activated Carbon Based on Shea Residue (Vitellaria paradoxa): Thermodynamics, Adsorption Mechanism, Nonlinear Kinetics, and Isotherms

Amola

Kamgaing

Tagne

et al. 2022

Journal of Chemistry

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“…In this statistical analysis, Table 5, the model F-value of 38.12 has a probability (p) value "Prob > F" of less than 0.05 which indicates that the model terms are significant as presented by other researchers (Balasubramania et al, 2012;Yamin et al, 2013;Arunachalam and Annadurai, 2011;Keshani et al, 2010) that adopted this method. The high value coefficient of determination (R 2 = 0.9871), which is higher than 0.80 (Keshaniet al, 2010), shows that the cubic polynomial model was highly significant and sufficient.…”

Section: Densitymentioning

confidence: 76%

Compositions Optimization of Antang Corundum for Developing Advanced Ceramic

Sanusi¹,

Dauda²,

Sumaila³

et al. 2018

Aceh Int. J. Sci. Technol

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-The research aims to study and optimize the formulation of materials required for advanced ceramic production using response surface methodology (RSM). In this research effort, the five (5) process independent variables studied with their corresponding levels are: Antang corundum powder, A (92.2 -100 %W); polyvinyl alcohol, B (0 -5 %W); CaO, C (0 -2.3 %W); MgO, D (0 -0.5 %W);and the sintering temperature, E (1200 -1500 °C).The mechanical property responses determined were density, ρ, compressive strength, C/S,flexural strength, F/S; which are key characteristics of ceramics for armour applications. The optimized density, compressive strength and flexural strength of the sintered Antang corundum are 3.45 g/cm 3 g, 1982 MPa and 295 MPa respectively; while the respective RSM prediction values are 3.46 g/cm 3 g, 1979 MPa and 286 MPa. The optimum material compositions from the experiment were Corundum, 95.66 %W; PVA, 2.78 %W; CaO, 1.28 %W; MgO, 0.28 %W at a Sintering Temperature of 1500 °C.On comparing the determined optimum mechanical responses of the sintered Antang ceramic with the maximum RSM prediction values, there is high level of assurance in using RSM for the formulation processing ceramic armour development.

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“…It really is an analytical technique that utilizes Fisher's F-test and P-test to estimate the model's and its parameters' significance [31]. In principle, bigger F-values and lower p-values indicate that the coefficient terms are more important [32]. Table 5 illustrates an ANOVA using the response surface model.…”

Section: Variables Of the Process 𝐁𝐨𝐱-𝐁𝐞𝐡𝐧𝐤𝐞𝐧 Levelmentioning

confidence: 99%

Removal of chemical oxygen demand (COD) from hospital wastewater by electro fenton process using graphite–graphite electrochemical system

Gijir¹,

Abbar²

2022

QJES

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Removal of COD from hospital wastewater generated from Al- Diwaniyah hospital located in Iraq was achieved using graphite–graphite electro-Fenton (EF) system. The effect of various operational parameters on the COD removal efficiency was investigated based on response surface methodology (RSM). Optimal conditions were the current density of 20mA/cm2, FeSO4 concentration of, and time of It achieved a COD elimination efficiency of 97.964 % at a specific energy consumption of 10.78 kWh/kg. The results indicated that time had the least effect on the efficiency with which chemical oxygen demand is eliminated, however, the share of current density had the greatest effect, followed by the FeSO4 concentration. The adequacy of the model equation was confirmed by its high R2 value (99.62%). The present study shows that the graphite–graphite EF system was an efficient tool for removing COD from hospital wastewaters.

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Optimized Response Surface Methodology for Adsorption of Dyestuff from Aqueous Solution

Cited by 33 publications

References 23 publications

Optimized Removal of Hydroquinone and Resorcinol by Activated Carbon Based on Shea Residue (Vitellaria paradoxa): Thermodynamics, Adsorption Mechanism, Nonlinear Kinetics, and Isotherms

Optimized Removal of Hydroquinone and Resorcinol by Activated Carbon Based on Shea Residue (Vitellaria paradoxa): Thermodynamics, Adsorption Mechanism, Nonlinear Kinetics, and Isotherms

Compositions Optimization of Antang Corundum for Developing Advanced Ceramic

Removal of chemical oxygen demand (COD) from hospital wastewater by electro fenton process using graphite–graphite electrochemical system

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