Optimization of Oxidative Leaching for Vanadium Extraction from Low-Grade Stone Coal Using Response Surface Methodology

The feasibility and kinetics of vanadium (V) recovery from oxidative leaching of low-grade stone coal using MnO2 were investigated. Oxidative leaching processes (OLPs) were designed using response surface methodology (RSM) based on the central composite design (CCD) model. The results show that the order of factors that influence OLPs is leaching temperature > H2SO4 concentration > leaching time > MnO2 dosage. The interaction between leaching temperature and H2SO4 concentration on the OLP is the most significant. Vanadium leaching efficiency was 89.3% using 31% H2SO4 and 3% MnO2 at 90 °C for 7.9 h. The kinetics of V leaching from stone coal show that the leaching rate is controlled by chemical reaction through a layer according to the shrinking core model and the activation energy is 55.62 kJ/mol. A comparison of the SEM-EDS results of minerals before and after leaching confirms that the muscovite structure was significantly destroyed and V and aluminum (Al) were effectively dissolved during the OLP.

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Dissolution Kinetics of Iron from Low-Grade Mn Ore and Optimization Using Response Surface Methodology

Transactions of the Indian Institute of Metals ◽

10.1007/s12666-017-1191-x ◽

2017 ◽

Vol 71 (3) ◽

pp. 589-596

Author(s):

Kanchan Agarwal ◽

N. R. Mandre ◽

T. Sharma

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Dissolution Kinetics ◽

Low Grade ◽

Kinetics Of ◽

Mn Ore

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Investigation of equilibrium and kinetics of Cr(VI) adsorption by dried Bacillus cereus using response surface methodology

Water Science & Technology ◽

10.2166/wst.2015.522 ◽

2015 ◽

Vol 73 (3) ◽

pp. 617-627 ◽

Cited By ~ 5

Author(s):

Kai Yang ◽

Jing Zhang ◽

Tao Yang ◽

Hongyu Wang

Keyword(s):

Response Surface Methodology ◽

Bacillus Cereus ◽

Response Surface ◽

Polynomial Equation ◽

Surface Chemical ◽

Biosorption Process ◽

Key Factor ◽

Equilibrium And Kinetics ◽

Kinetics Of ◽

Central Composite

In this study, response surface methodology (RSM) based on three-variable-five-level central composite rotatable design was used to analyze the effects of combined and individual operating parameters (biomass dose, initial concentration of Cr(VI) and pH) on the Cr(VI) adsorption capacity of dried Bacillus cereus. A quadratic polynomial equation was obtained to predict the adsorbed Cr(VI) amount. Analysis of variance showed that the effect of biomass dose was the key factor in the removal of Cr(VI). The maximum adsorbed Cr(VI) amount (30.93 mg g−1) was found at 165.30 mg L−1, 2.96, and 3.01 g L−1 for initial Cr(VI) concentration, pH, and biosorbent dosage, respectively. The surface chemical functional groups and microstructure of unloaded and Cr(VI)-loaded dried Bacillus cereus were identified by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), respectively. Besides, the results gained from these studies indicated that Langmuir isotherm and the second-order rate expression were suitable for the removal of Cr(VI) from wastewater. The results revealed RSM was an effective method for optimizing biosorption process, and dried Bacillus cereus had a remarkable performance on the removal of Cr(VI) from wastewater.

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Modeling and optimization of low-grade Mn bearing ore leaching using response surface methodology and central composite rotatable design

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(11)61463-5 ◽

2012 ◽

Vol 22 (9) ◽

pp. 2295-2305 ◽

Cited By ~ 27

Author(s):

Dariush AZIZI ◽

Sied Ziaedin SHAFAEI ◽

Mohammad NOAPARAST ◽

Hadi ABDOLLAHI

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Low Grade ◽

Central Composite Rotatable Design ◽

Modeling And Optimization ◽

Central Composite ◽

Rotatable Design

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Enzyme-assisted Extraction for Optimized Recovery of Phenolic Bioactives from Peganum hermala Leaves Using Response Surface Methodology

Current Topics in Nutraceutical Research ◽

10.37290/ctnr2641-452x.17:349-354 ◽

2018 ◽

Vol 17 (4) ◽

pp. 349-354

Author(s):

Qadir Rahman ◽

Anwar Farooq ◽

Amjad Gilani Mazhar ◽

Nadeem Yaqoob Muhammad ◽

Ahmad Mukhtar

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Enzyme Concentration ◽

Coumaric Acid ◽

Assisted Extraction ◽

Pre Treatment ◽

Optimized Conditions ◽

Enzyme Complexes ◽

Hydrolysis Of ◽

Central Composite

This study investigates the effect of enzyme formulations (Zympex-014, Kemzyme dry-plus and Natuzyme) on recovery of phenolics from Peganum hermala (harmal) leaves, under optimized conditions using response surface methodology. As compared to the other enzyme complexes, the yield (34 g/100g) obtained through Zympex-014-assisted extraction was higher under optimized conditions such as time (75 min), temperature (70°C), pH (6.5) and enzyme concentration (5 g/100 g) using central composite design (CCD). Effectiveness of Zympex-014 towards hydrolysis of P. hermala leaves cell wall was examined by analyzing the control and enzyme-treated leave residues using scanning electron microscope (SEM). GC/MS characterization authenticated the presence of quercetin (1.44), gallic acid (0.23), caffeic acid (0.04), cinnamic acid (0.05), m-coumaric acid (0.23) and p-coumaric acid (0.37 μg/g) as the potent phenolics in Zympex-014 based extract. It can be concluded from the findings of the current work that pre-treatment of P. hermala leaves with Zympex-014 significantly enhanced the recovery of phenolics that supports its potential uses in the nutra-pharamaceutical industry.

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Response Surface Methodology towards Optimization of Calotropis Procera Essential oil Extraction by using Supercritical CO2.

The Natural Products Journal ◽

10.2174/2210315509666191122095706 ◽

2019 ◽

Vol 09 ◽

Author(s):

Hossein Zaeri ◽

Bahareh Kamyab Moghadas ◽

Bijan Honarvar ◽

Ali Shokuhi Rad

Keyword(s):

Response Surface Methodology ◽

Essential Oil ◽

Response Surface ◽

Extraction Time ◽

Calotropis Procera ◽

Retrieval Rate ◽

The Family ◽

Effects Of Temperature ◽

Carbon Dioxide Co2 ◽

Central Composite

: In this research, the extraction of essential oil from Calotropis Procera with the family name of Asclepiadaceae, by supercritical carbon dioxide (CO2) solvent has been investigated in detail, and the yield and chemical profile of the extracts achieved by this method were compared with those resulted by the conventional Hydro distillation method. To optimize the process parameters of CO2 supercritical extraction (SCE) of the Calotropis Procera, the Response Surface Methodology (RSM) with central composite design (CCD) was employed. The effects of temperature, pressure, and extraction time on the oil yield are considered for investigation. Results showed that the data were sufficiently fitted into the second-order polynomial model. The extraction conditions, including pressure, temperature, and extraction time, were studied between 150-200 bar, 40-50 ºC, and 50-100 min, respectively. The optimal conditions are achieved as the temperature of 47.19ºC, the pressure of 172.2 bar, and time of 86 minutes with the retrieval rate of 31.39%.

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Enhancement of soil physico-chemical properties post compost application: Optimization using Response Surface Methodology comprehending Central Composite Design

Journal of Environmental Management ◽

10.1016/j.jenvman.2021.112461 ◽

2021 ◽

Vol 289 ◽

pp. 112461

Author(s):

Payal Mazumder ◽

Akhil PM ◽

Jyoti ◽

Meena Khwairakpam ◽

Umesh Mishra ◽

...

Keyword(s):

Response Surface Methodology ◽

Central Composite Design ◽

Response Surface ◽

Chemical Properties ◽

Physico Chemical ◽

Compost Application ◽

Application Optimization ◽

Central Composite

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Optimizing of Microalgae Scenedesmus sp. Biomass Production in Wet Market Wastewater Using Response Surface Methodology

Sustainability ◽

10.3390/su13042216 ◽

2021 ◽

Vol 13 (4) ◽

pp. 2216

Author(s):

Najeeha Mohd Apandi ◽

Mimi Suliza Muhamad ◽

Radin Maya Saphira Radin Mohamed ◽

Norshuhaila Mohamed Sunar ◽

Adel Al-Gheethi ◽

...

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Biomass Yield ◽

Biomass Productivity ◽

Maximum Growth ◽

Maximum Growth Rate ◽

Aeration Rate ◽

Composition Analysis ◽

Wet Market ◽

Central Composite

The present study aimed to optimize the production of Scenedesmus sp. biomass during the phycoremediation process. The biomass productivity was optimized using face centred central composite design (FCCCD) in response surface methodology (RSM) as a function of two independent variables that included wet market wastewater concentrations (A) with a range of 10% to 75% and aeration rate (B) with a range of 0.02 to 4.0 L/min. The results revealed that the highest biomass productivity (73 mg/L/d) and maximum growth rate (1.19 day−1) was achieved with the 64.26% of (A) and 3.08 L/min of (B). The GC-MS composition analysis of the biomass yield extract revealed that the major compounds are hexadecane (25%), glaucine (16.2%), and phytol (8.33%). The presence of these compounds suggests that WMW has the potential to be used as a production medium for Scenedesmus sp. Biomass, which has several applications in the pharmaceutical and chemical industry.

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