Article
Engineering, Chemical
Ze Liu, Xuetong Yang, Kristof Demeestere, Stijn Van Hulle
Summary: The study designed a packed bubble column to enhance the removal efficiency of ozone-persistence TrOCs. The predicted removal approach can be applied in packed system.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Bin Jiang, Chengxiang He, Wei Zhan, Shouchuan Li, Chunying Zhu, Youguang Ma, Taotao Fu
Summary: In the study, the mass transfer of mixed gas in a microchannel was examined by using an organic amine aqueous solution to absorb CO2/N2 mixed gas. The mass transfer during the bubble formation stage was calculated and the impact of operating conditions on it was investigated. The results showed a continuous decrease in the instantaneous mass transfer driving force and coefficient as the bubble moved along the microchannel after the mixed gas entered at a certain concentration.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Biotechnology & Applied Microbiology
Andreas Heyland, Jordan Roszell, Jeremy Chau, Kevin Chai, Andrew Eaton, Kathleen Nolan, Kyle Madden, Wael H. Ahmed
Summary: An innovative and energy-efficient algae-based nutrient removal system was developed in this study, optimizing mass transfer with novel aeration and mixing technology. Results showed that increasing concentration gradients significantly improved nutrient transfer rates. The study supports the scalability of the design and the use of this novel NRS for nutrient removal in aquaculture and potentially other applications.
BIOTECHNOLOGY FOR BIOFUELS
(2021)
Article
Engineering, Chemical
Steven Sutton, Robert W. M. Pott, Wessel Du Toit
Summary: This article examines the desorption of dissolved oxygen in different wines and identifies the presence and concentration of proteins as factors contributing to the variation in oxygen desorption.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Environmental
Fei Liu, Gary T. Rochelle, Tao Wang, Eric Chen, Mengxiang Fang
Summary: Amine scrubbing is a promising technology for CO2 capture, with the biphasic solvent of 25% AEEA/50% DEEA showing potential for significant reduction in regeneration energy. The fast CO2 absorption rate of the solvent, especially at higher CO2 equilibrium partial pressure, makes it an efficient option for reducing capital costs.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Biotechnology & Applied Microbiology
Sonia Mohamadnia, Omid Tavakoli, Mohammad Ali Faramarzi
Summary: This study investigates the scale-up strategy of using the constant volumetric mass transfer coefficient (kLa) to increase the production of fucoxanthin in T. lutea. By providing adequate aeration, nutrients, and light availability, the cell density and fucoxanthin content were improved. The scale-up process was successful, with increased fucoxanthin productivity and biomass productivity in larger cultivation flasks and photobioreactors.
JOURNAL OF BIOTECHNOLOGY
(2022)
Article
Environmental Sciences
Xuetong Yang, Ze Liu, Dave Manhaeghe, Yongyuan Yang, Joel Hogie, Kristof Demeestere, Stijn W. H. Van Hulle
Summary: The study found that both LBC and MBC improved the O-3 mass transfer efficiency and hydroxyl radicals generation compared to the non-packed bubble column, leading to increased removal of humic acids from aqueous solution.
Article
Energy & Fuels
Pao-Chi Chen, Shiun-Huang Zhuo, Jyun-Hong Jhuang
Summary: This study successfully developed a novel CO2 capture process using sodium aluminate alkaline solution, which could recycle sodium carbonate through crystallization. The influence of different operational variables on CO2 absorption efficiency, absorption rate, absorption factor, etc. in a steady state was explored. CO2 concentration was found to be the most important variable, while liquid temperature was the least important.
Article
Engineering, Chemical
Manuel A. Taborda, Martin Sommerfeld, Marcelo Muniz
Summary: Based on a LES Euler/Lagrange approach, numerical computations of single bubble rise and bubble swarms in a column were conducted and validated, considering mass transfer and chemical reactions. The study utilized Large Eddy Simulation to calculate fluid flow and model turbulence in the carrier phase, while taking into account all important interfacial forces influencing bubble motion. Results demonstrated that modeling bubble dynamics has a significant impact on mass transfer.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Chemical
Jinghao Bi, Weijun Qin, Dongjie Xie, Fan Xie, Xiao Xu
Summary: Scale-up bubble columns for wet air oxidation (WAO) provide a novel solution to sodium acetate-containing waste discharge. By simulating a high temperature reactor, optimal dimensions and operational conditions were determined, resulting in high degradation efficiency.
Article
Engineering, Chemical
Tingting Dong, Yongli Ma, Mingyan Liu
Summary: This paper investigates the gas-liquid mass transfer characteristics in a gas-liquid-solid mini fluidized bed (GLSMFB). The study finds that the liquid volumetric mass transfer coefficient and gas-liquid interfacial area increase with the increase of the superficial gas velocity within the experimental parameter range. Additionally, the liquid volumetric mass transfer coefficient increases with the increase of the superficial liquid velocity at the same ratio of superficial gas to liquid velocity.
Article
Chemistry, Physical
Nadezhda M. Panich, Boris G. Ershov
Summary: The solubility and stability of ozone in acetonitrile were studied in the temperature range of 233-295 K. Optimum conditions for using acetonitrile as an ozonation medium were determined. The decomposition rate of O-3 increases with the amount of water in acetonitrile. Calculations were performed to determine the solubility coefficients and limiting solubility of O-3 in acetonitrile at different temperatures.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Applied
Phillip Roche, Roderick C. Jones, Brian Glennon, Philip Donnellan
Summary: A lab-scale bubble column was studied as an alternative method for low-temperature binary solvent swap, and both theoretical modeling and experimental results confirmed its effectiveness and accuracy in achieving desired evaporation rates and solvent concentration changes.
ORGANIC PROCESS RESEARCH & DEVELOPMENT
(2022)
Article
Engineering, Chemical
Chengxiang Li, Yizhou Cui, Xiaogang Shi, Jinsen Gao, Xingying Lan
Summary: This study evaluates the applicability and accuracy of three widely-used mass transfer models in the simulations of mass transfer in bubble columns. By comparing simulation results with experimental data, suggestions on choosing a proper mass transfer model are provided. The influence of bubble-induced turbulence and its different modeling approaches on different mass transfer models are also investigated.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Biotechnology & Applied Microbiology
Ayman A. Abufalgha, Robert W. M. Pott, Kim G. Clarke
Summary: This study investigates the impact of various operating conditions on oxygen transfer behavior in multiphase systems, showing how gas velocity, solid loading, and hydrocarbon concentration affect the overall volumetric oxygen transfer coefficient. The complex interactions between different phases in the system lead to changes in hydrodynamics and ultimately influence oxygen transfer efficiency.
BIOPROCESS AND BIOSYSTEMS ENGINEERING
(2021)
Article
Environmental Sciences
Hossein Mashhadimoslem, Ahad Ghaemi
Summary: This research focuses on predicting the adsorbed amount of N-2, O-2, and N2O on carbon molecular sieve and activated carbon using the artificial neural network (ANN) approach. Experimental isotherm data and different models were used to establish the neural network, achieving high prediction accuracy.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Energy & Fuels
Fatemeh Ardestani, Ahad Ghaemi, Jaber Safdari, Alireza Hemmati
Summary: The behavior of hydrodynamic parameters and mass transfer of an L-shaped pulsed sieve-plate extraction column in the process of extracting uranium from uranyl nitrate solution was studied. Sensitivity analysis of the overall volumetric coefficient of mass transfer was conducted by changing operating parameters. Experimental observations showed that the pulsation intensity had the most significant impact on the behavior of the studied parameters. Three models were used to determine the mass transfer coefficient, with ADM and FMM providing more accurate predictions than PFM.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Engineering, Chemical
Sara Abdi, Masoud Nasiri, Zhaohuan Mai
Summary: Dissipative particle dynamics (DPD) simulation was used to investigate the self-assembled structure of DTAB and 12-6-12 surfactants in aqueous solution. The effects of simulation time and surfactant concentration on micelle formation were studied. Increasing the surfactant concentration led to the deformation of micellar clusters into spherical, wormlike, cylindrical, and lamellar shapes. The study also investigated the influence of surfactant and gold concentrations on the micellar-enhanced ultrafiltration (MEUF) process for Au(III) separation, estimating the separation efficiency of gold mesomolecules and micellar binding constant. The simulation results demonstrated the excellent effect of micelles on Au(III) separation using the MEUF process, as the surfactant concentration increased and micelles grew in size, resulting in increased bonding probability between metal mesomolecules and micelles and decreased passage of gold beads through the polymeric membrane.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Engineering, Chemical
Monireh Zolfaghari, Masoud Nasiri, Ali Haghighi Asl
Summary: Microemulsion systems are attracting attention from researchers because of their low energy requirements and thermodynamic stability in a wide range of applications. The viscosity of microemulsions was characterized and predicted in this study, using Tween 20 and Tween 80 as surfactants and n-butanol as co-surfactant. Different types of Winsor microemulsions were described using the phase diagram and evaluated for viscosity, particle size, and electrical conductivity. The mean droplet size and viscosity of the microemulsion were 8-200 nm and 10.4-39.1 cp, respectively. Finally, a new equation was proposed to predict microemulsion viscosity based on the ratio of dispersed phase fraction to surfactant fraction.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Mohadeseh Noroozian, Shahrokh Shahhosseini, Ahad Ghaemi
Summary: In this study, piperazine-modified activated alumina was used for CO2 capture process. Artificial neural networks (ANNs) and response surface methodology (RSM) were employed to identify the behavior and performance of the CO2 capture process. The results showed that ANNs produced more accurate predictions than RSM.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2023)
Article
Energy & Fuels
Maryam Helmi, Farzad Moazami, Ahad Ghaemi, Alireza Hemmati
Summary: In this study, CO2 adsorption experiments were conducted using NaOH@Chitosan-Fe3O4 as a magnetic biodegradable adsorbent. Chitosan was magnetized with Fe3O4 nanoparticles and NaOH solution was immobilized on it to enhance its alkali nature. The results showed that the adsorption capacity increased with increasing pressure and decreasing temperature. The highest adsorption capacity was achieved at 25 degrees C and 9 bar. The isotherm study revealed that the Langmuir, Freundlich, and Sips models provided the best fit to the experimental data. The Elovich kinetic model was the most suitable for describing the adsorption process. The thermodynamic analysis indicated that the adsorption process was exothermic and spontaneous. The diffusion coefficient, mass flux, and mass transfer coefficient for CO2 molecules were calculated to be 2.850 m2/s, 0.0042 mol/m2.s, and 10.324 m/s, respectively.
Article
Polymer Science
Mobina Khakbaz, Ahad Ghaemi, Gity Mir Mohamad Sadeghi
Summary: This study generated hyper-cross-linked polycarbonate polymer (HCP) from waste polycarbonate using Friedel-Crafts technique. The produced resin exhibited efficient adsorption of metallic ions from contaminated media. Process variables were optimized using response surface methodology (RSM). The optimized conditions for maximum lead uptake capacity were found to be a temperature of 35 ?, pH of 8, cadmium amount of 41.70 mg/L, and lead amount of 79.99 mg/L, while the optimum values for maximizing cadmium uptake capacity were a temperature of 35.67?, pH of 8, cadmium concentration of 40.03 mg/L, and lead concentration of 79.39 mg/L. The adsorption mechanism involved the transfer of lead and cadmium ions to the holes of HCP and the formation of chemical bonds between benzene rings and the metallic ions.
IRANIAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Pouran Rahnama Haratbar, Masoud Nasiri, Ahad Ghaemi
Summary: This study synthesized hypercrosslinked polystyrene adsorbents based on polystyrene (P-HCP) and expanded polystyrene (EPS-HCP) using a simple one-step Friedel-Crafts reaction for lead removal. The synthesized adsorbents showed high surface areas and porous morphologies. The experiments demonstrated that the hypercrosslinked adsorbent can effectively remove lead ions from the effluent solution, with optimal conditions of 30°C temperature, 40 minutes contact time, and 80 mg/L lead concentration.
IRANIAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Mobina Khakbaz, Ahad Ghaemi, Gity Mir Mohamad Sadeghi
Summary: Polymeric waste is a significant issue in landfills, but finding environmentally-friendly and cost-effective solutions for minimizing it has been challenging. This research synthesized a polycarbonate-based hypercrosslinked polymer (HCP) adsorbent for Pb(II) ion removal. The synthesized polymer showed high efficiency in removing Pb(II) ions from wastewater. Factors such as initial concentration, removal time, and temperature were investigated to optimize the adsorption process.
Article
Multidisciplinary Sciences
Azadeh Yarahmadi, Mohammad Hassan Khani, Masoud Nasiri Zarandi, Younes Amini, Ali Yadollahi
Summary: This study investigated the removal efficiency of Cerium (Ce(III)) and lanthanum (La(III)) ions from aqueous solution using Amberlite XAD-7 resin impregnated with DEHPA (XAD7-DEHPA). The optimal operating conditions were determined through response surface methodology based on the central composite design. The results showed that XAD7-DEHPA resin was effective in selectively removing Ce(III) and La(III) ions, with an adsorption percentage of 99.99% and 78.76% respectively. Langmuir isotherm model was found to best describe the equilibrium data, and the maximum adsorption capacity of the adsorbent was 8.28 mg/g for Ce(III) and 5.52 mg/g for La(III).
SCIENTIFIC REPORTS
(2023)
Article
Energy & Fuels
Kamyar Naderi, Amirsoheil Foroughi, Ahad Ghaemi
Summary: This study investigated the hydraulic characteristics of a structured packing column for an air/water system using artificial neural network and response surface methodology. It identified that the gas factor and liquid load had the greatest effect on pressure drop and liquid hold-up.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Chemistry, Multidisciplinary
Maryam Helmi, Farzad Moazami, Alireza Hemmati, Ahad Ghaemi
Summary: In this study, Fe3O4 nanoparticles were incorporated onto graphene oxide (GO) layers to maintain the surface area of GO, while GO-Fe3O4 maintained their nanostructure. A 0.1 N KOH solution was added to enhance the alkaline nature of GO-Fe3O4 using an impregnation method. The adsorbent exhibited a mesoporous structure with a pore diameter of 15.05 nm according to Brunauer-Emmett-Teller analysis. The adsorption capacity of CO2 was highest at 6.812 mmol/g when using 0.5 g of adsorbent at 298 K and 9 bar, and the adsorption mechanism was physisorption between the active sites of KOH@GO-Fe3O4 and CO2 molecules.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Energy & Fuels
Mohammad Sadegh Karambeigi, Atefeh Hasan-Zadeh, Mohammad Saber Karambeigi, Seyyed Ali Faal Rastegar, Masoud Nasiri, Yousef Kazemzadeh
Summary: This research develops a multi-objective optimization methodology for chemically enhanced oil recovery in a sandstone reservoir. It combines experimental design methods and artificial intelligence techniques to optimize the control variables and achieve the highest performance of a surfactant/polymer injection project. The results demonstrate the effectiveness of this hybrid artificial intelligence methodology.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Azadeh Yarahmadi, Mohammad Hassan Khani, Masoud Nasiri Zarandi, Younes Amini
Summary: The aim of this study was to investigate the ability of AXAD-7 resin impregnated with CYANEX-272 to remove cerium and lanthanum ions from aqueous solutions. The prepared adsorbent material was characterized using FTIR, SEM-EDX, and BET methods. The impact of process variables including pH, adsorbent dose, and temperature on the removal of cerium and lanthanum ions was evaluated. The results showed that AXAD-7 resin impregnated with CYANEX-272 performed well in removing both cerium and lanthanum ions.
SCIENTIFIC REPORTS
(2023)
