Modelling of the performance of asphalt pavement using response surface methodology—the kinetics of the aging

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 the kinetics of essential oil content and main constituents of mint ( Mentha aquatica L.) leaves during thin‐layer drying process using Response Surface Methodology

Journal of Food Processing and Preservation ◽

10.1111/jfpp.15515 ◽

2021 ◽

Author(s):

Amin Taheri‐Garavand ◽

Hasan Mumivand ◽

Soodabeh Fatahi ◽

Amin Nasiri ◽

Mahmoud Omid

Keyword(s):

Response Surface Methodology ◽

Essential Oil ◽

Thin Layer ◽

Response Surface ◽

Oil Content ◽

Drying Process ◽

Mentha Aquatica ◽

Thin Layer Drying ◽

Kinetics Of

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Mercenaria mercenaria shell: coagulation-flocculation studies on colour removal by Response Surface Methodology and nephlometric kinetics of an industrial effluent

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2021.105715 ◽

2021 ◽

pp. 105715

Author(s):

Ifeoma Maryjane Iloamaeke ◽

Nnaemeka J. Nnaji ◽

Edith Chinyere Okpala ◽

Augustine N. Eboatu ◽

Theresa Uzoma Onuegbu

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Industrial Effluent ◽

Mercenaria Mercenaria ◽

Colour Removal ◽

Kinetics Of

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

Processes ◽

10.3390/pr8121534 ◽

2020 ◽

Vol 8 (12) ◽

pp. 1534

Author(s):

Zulv Huang ◽

Tao Chen ◽

Yang Zhou ◽

Wenbin Xu ◽

Hanzhi Lin ◽

...

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Low Grade ◽

Stone Coal ◽

H2so4 Concentration ◽

Before And After ◽

Shrinking Core ◽

Oxidative Leaching ◽

Kinetics Of ◽

Central Composite

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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