Chemical Engineering Commons^™

Visible-Light Photocatalysis Of Au-, Ag- And Cu-Doped Titanium Dioxide Coated Plastic Film Synthesized By Condensation Method For Dye Degradation, Pattika Cheunwisat

Chulalongkorn University Theses and Dissertations (Chula ETD)

The photocatalyst coated on plastic film is a good practice for water treatment. It provided a facile way to solve the particle aggregation and separation problem. Cu/TiO2, Ag/TiO2, and Au/TiO2 coated on PET film were prepared by two condensation methods depending on the mixing routes. A method of coating process was successfully completed and confirmed by various techniques. Their photocatalytic activity was investigated by the methylene blue dye degradation under visible light irradiation. The metal-doped titanium dioxide coated on film via method II showed the highest photocatalytic activity. The modification surface of TiO2 film photocatalyst by metal resulted in coverage …

Exsolution Of La0.3sr0.7ti0.9co0.1o3-X Cathode For Co2 And H2o Co-Electrolysis Using Solid Oxide Electrolysis Cell, Sothearoth Heng

Chulalongkorn University Theses and Dissertations (Chula ETD)

One way to achieve carbon neutrality and sustainable future energy scenarios is through the valorization of CO2 into valuable chemicals using solid oxide electrolysis cells (SOECs). However, the electrochemical performance and sulfur tolerance of cathode materials used for SOECs under a gas feed containing H2S species still requires further development. In this study, we successfully synthesized in-situ exsolved Co nanoparticles decorated on the La0.3Sr0.7Ti0.9Co0.1O3-x (LSTC) perovskite oxide (ex-LSTC) under a reductive atmosphere at high temperatures. The electrolyte-supported single cell with the ex-LSTC cathode exhibited remarkable electrocatalytic activity toward CO2 and H2O co-electrolysis with a maximum current density of approximately 705 …

Sodium Hydroxide Post Treatment Optimization For Electrospun Nanofiber As The Support For Thin-Film Composite Membrane For Reverse Osmosis, Anniza Cornelia Augusty

Chulalongkorn University Theses and Dissertations (Chula ETD)

Poly(acrylonitrile-co-methyl acrylate) (PAN-co-MA) was electrospun onto non-woven backing and used as the support for thin film nanofiber composite (TFNC) membranes. Post treatment via hydrolysis using NaOH solution was applied to the support layer. The effect of NaOH concentration, reaction temperature and reaction time on the support physicochemical properties, thin film morphology and surface chemistry, and membrane performances were investigated. Furthermore, the response surface methodology (RSM) – Box Behnken Design (BBD) experimental design was employed to find the optimal hydrolysis parameters condition and thus obtain the best NaCl rejection and pressure-normalized flux. The membrane characterizations, consisting of support pore size, chemical …

Photocatalytic Films For Efficient Gas Phase Co2 Reduction Into Value-Added Chemicals, Mohammad Fereidooni

Chulalongkorn University Theses and Dissertations (Chula ETD)

A viable method to lower the atmospheric CO2 concentration is artificial photosynthesis, which converts CO2 and H2O into products with added value. Herein, the catalytic activity of thin photocatalytic films was examined in water vapor, batch, and flow reactor configurations for CO2 reduction. In addition to the experimental study, a theoretical analysis of the reaction mechanism over silica-modified amorphous TiO2 (AM-TiO2-SiO2) and indium tin oxide (ITO) photocatalysts is conducted. In the case of AM-TiO2-SiO2, the research shows that surfaces with low loading of SiO2 groups have a higher affinity for certain target molecules (T-M). This affinity accelerates adsorption and reaction …

Depolymerization Of Dealkaline Lignin In Co-Solvent System By Electrochemical Advanced Oxidation In A Microreactor, Lalida Waura-Angkura

Chulalongkorn University Theses and Dissertations (Chula ETD)

Currently, the production of fuels and chemicals heavily relies on non-renewable petroleum oil, which is projected to be depleted by 2050. Lignin is the largest source of renewable aromatic compounds rich in carboxylic and hydroxyl functional groups, thus potentially being used as a renewable alternative for the production of valuable chemicals. In light of aromatic compounds’ recovery from lignin, this work focuses on the efficient depolymerization of dealkaline lignin using the electrochemical advanced oxidation process (EAOP) under ambient conditions in a continuous-flow microreactor system. As hydroxyl radicals generated from water at the anode are the key to the EAOP and …

Numerical Simulation Study For Carbon Dioxide Sequestration In A Depleted Oil Reservoir, Romal Ramadhan

Chulalongkorn University Theses and Dissertations (Chula ETD)

Due to the rise in greenhouse gas concentrations in the atmosphere, one of the most concerning issues at the moment is the climate change. One of the techniques to reduce CO2 emissions, particularly geological storage, is carbon capture and storage (CCS). This study provides the statement of how pressure build-up and CO2 injection rates impact several aspects of CO2 storage, including storage capacity, plume migration, and shut-in time. This study aims to assess the storage capacity of geological formations with different maximum pressure varying from 70% - 90% of fracture pressure to evaluate the formation response to various maximum pressure …

Production Of Jet-Fuel Range Hydrocarbons From Methanol Through The One-Pot Cascade Reactions In A Fixed-Bed Reactor, Natthanicha Prawiset

Chulalongkorn University Theses and Dissertations (Chula ETD)

The demand for sustainable and efficient processes for the production of jet fuel range hydrocarbons has been increasing due to the environmental concerns associated with conventional fossil fuel sources. The research focuses on the development and optimization of a catalytic system capable of converting methanol, which can be produced from carbon dioxide, into jet-fuel range hydrocarbons through one-pot cascade reactions in a fixed-bed reactor. The study begins with catalyst screening, HZSM-5 catalyst with a high SiO­2/Al2O3 ratio of 322 was chosen for the firstly converted methanol into light olefins intermediate, and the HZSM-5 catalyst with SiO­2/Al2O3 ratio of 40 was …

Prediction Of Polybutadiene Rubber Property Via Artificial Neural Network, Ronakrit Laohamonthonkul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Polybutadiene rubber (PBR) is manufactured by polymerization of 1,3-butadiene (BD). Mooney viscosity is an essential property of PBR which is time-consuming in the laboratory to receive the result. Mooney viscosity of PBR depends on various process parameters, and correlations between key process parameters and Mooney viscosity (MV) are highly complex and non-linear. Artificial neural network (ANN) assists the prediction of MV by identifying the correlations between key process parameters and MV. Nine ANN-based models from two training functions in MATLAB were developed to predict Mooney viscosity based on actual process parameters and MV value in 2022. The analytical part of …

Reducing Print Time While Minimizing Loss In Mechanical Properties In Consumer Fdm Parts, Long Le, Mitchel A. Rabsatt, Hamid Eisazadeh, Mona Torabizadeh

Mechanical & Aerospace Engineering Faculty Publications

Fused deposition modeling (FDM), one of various additive manufacturing (AM) technologies, offers a useful and accessible tool for prototyping and manufacturing small volume functional parts. Polylactic acid (PLA) is among the commonly used materials for this process. This study explores the mechanical properties and print time of additively manufactured PLA with consideration to various process parameters. The objective of this study is to optimize the process parameters for the fastest print time possible while minimizing the loss in ultimate strength. Design of experiments (DOE) was employed using a split-plot design with five factors. Analysis of variance (ANOVA) was employed to …

Hydrocarbon Source Rocks In Kazhdumi And Pabdeh Formations—A Quick Outlook In Gachsaran Oilfield, Sw Iran, Majid Safaei-Farouji, Mohammadreza Kamali, Mohammad Hail Hakimi

Research outputs 2014 to 2021

Geochemical study of Kazhdumi and Pabdeh Formations as potential source rocks in Gachsaran Oilfield demonstrates that the Kazhdumi Formation has a fair to good capability of hydrocarbon generation and predominately contains type II-III kerogen. On the other hand, the Pabdeh Formation has a poor to good petroleum potential and contains different kerogen types, including type II, type II-III, type III and even for one sample, type IV, indicating different depositional conditions for this formation. The geochemical log of the Kazhdumi Formation shows that there is a close correlation between different geological parameters as noticed prominently in well number 55, which …

Efficient Removal Of Lead Ions From Aqueous Media Using Sustainable Sources On Marine Algae, Hannah Namkoong, Erik Biehler, Gon Namkoong, Tarek M. Abdel-Fattah

Electrical & Computer Engineering Faculty Publications

The goal of this project is to explore a new method to efficiently remove Pb(II) ions from water by processing Undaria pinnatifida into immobilized beads using sodium alginate and calcium chloride. The resulting biosorbent was characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDS). Using immobilized U. pinnatifida, we investigated the effect of various factors on Pb(II) ion removal efficiency such as temperature, pH, ionic strength, time, and underlying biosorption mechanisms. For Pb(II) ion biosorption studies, Pb(II) ion biosorption data were obtained and analyzed using Langmuir and Freundlich adsorption models. It …

Effect Of Methyl Orange On Wettability Of Sandstone Formations: Implications For Enhanced Oil Recovery, Fatemah Alhamad, Mujahid Ali, Muhammad Ali, Hussein Abid, Hussein Hoteit, Stefan Iglauer, Alireza Keshavarz

Research outputs 2022 to 2026

With the increasing global population, fossil fuel resources still represent a main contributor to the energy supply, despite the progress made in the field of renewable energies. Large quantities of residual oil from mature reservoirs cannot be produced through primary and secondary recovery methods. Among alternative recovery techniques, chemically enhanced oil recovery methods are attracting considerable interest to increase the hydrocarbon recovery from oil-bearing geological formations. The wettability of any particular formation can be used to predict the oil recovery factor of a reservoir based on its wetting state. However, due to the complex nature of geological porous media, special …

A Vacuum-Driven Distillation Technology Of Aqueous Solutions And Mixtures, Guo Guangyu

Dissertations

Distillation of aqueous solutions and aqueous mixtures has vast industrial applications, including desalination, wastewater treatment, and fruit juice concentration. Currently, two major distillation technologies are adopted in the industry, membrane separation and thermal distillation. However, both of them face certain inevitable drawbacks. Membrane separation has disadvantages as relying on high-grade energy, requiring membrane, fouling problem, narrow treatment range, limited scalability, and vibrating and noisy operating conditions. Traditional thermal distillation technologies can avoid above concerns but has other shortcomings, such as relatively low energy efficiency and yield rate, complicated and bulky system structure, and scaling problem.

This project proposes an innovative …

Hydrodynamic Characterization Of Laboratory And Production Equipment For Pharmaceutical Testing And Manufacturing Using Experimental And Computational Approaches, Chadakarn Sirasitthichoke

Dissertations

The hydrodynamics of process units used in pharmaceutical industry, i.e., the distribution of velocity profiles and shear stresses within the vessel, often controls the process performance, significantly affecting product quality. The hydrodynamics is strongly influenced by several factors such as the vessel shape, stirrer type, presence of internals and baffles, agitation intensity, and liquid properties. Most of these parameters can be varied by the process designers and the operators to achieve the desired process outcomes. The impact of the hydrodynamics on the process outcome can be profound in both large vessels (e.g., reactors) and smaller vessels (e.g., dissolution vessels), involving …

Electric-Field-Driven Processes In Multiphase Fluid Systems, Qian Lei

Dissertations

Advantages of using electric fields in miniaturized apparatuses for a wide range of applications are revealed by numerous experimental and theoretical studies over the last several decades as it offers a simple and efficient method for manipulation of multiphase fluid systems. This approach is considered to be especially beneficial for control of boiling processes and colloidal suspensions considered in the presented work.

Boiling. Today's trends for enhancing boiling heat transfer in terrestrial and space applications focus on removal of bubbles to prevent formation of a vapor layer over the surface at a high overheat. In contrast, this dissertation presents a …

Bodipy Based Photodynamic Therapy And Potassium Probes, Xiangshan Liu

Dissertations

Boron dipyrromethene (BODIPY) has become more and more popular in photophysical and biological applications. BODIPY based fluorescence compounds have numerous advantage properties including low toxicity, high absorption extinction coefficients, high fluorescence quantum yields, sharp fluorescence emissions, and resistance to photobleaching. All the good properties lead to the wide applications of BODIPY based compounds. In this research, two different kinds of BODIPY are synthesized. Firstly, BDBrC containing carbazole and BODIPY core is synthesized. Cellular uptake research shows BDBrC can target on lysosome and singlet oxygen generation research result indicates that BDBrC can be used in photodynamic therapy. BDBrC also shows pH-sensitive …

Flexible Microfluidic Device With Nonplanar Interdigitated Microelectrodes, Saud Alssaidy

Theses

The lab-on-a-chip concept has improved significantly in recent years to meet global demand for various applications with the advent of new technologies. Much progress has been achieved, but many microfluidic devices still suffer from design limitations in terms of sensitivity and selectivity because they use rigid, fragile substrate materials and conventional electrodes, which do not provide high sensitivity or selectivity and suffer from signal-to-noise ratio issues. This work proposes a novel device architecture that uses flexible, transparent top and bottom layers integrated with (nonplanar interdigitated microelectrodes) to create a sandwich-like flexible substrate base. The top and bottom layers consist of …

Itraconazole Nanocomposites Prepared Via Rotary Evaporator Drying Of Nanomilled Suspensions, Alexander Santos Coelho

Theses

The aim of this study is to explore the feasibility of rotary evaporation for drying wetmilled drug suspensions as a novel approach to produce drug nanocomposites that exhibit fast redispersion and immediate drug release. To this end, the physical stability of the nanomilled itraconazole (drug) suspensions, a.k.a., nanosuspensions, during the milling and storage; the drying of the itraconazole nanosuspensions via the rotary evaporator; and the type/loading of various polymers/surfactants (dispersants) on aqueous redispersion and drug release from the nanocomposites were examined. Our results suggest that smaller drug particle size, owing to nanomilling, and smaller nanocomposite particle size, owing to optimized …

Overview On The Lebanese Environmental Governance System: Main Hazards In The Oil And Gaz Sector, Rami Harkous

BAU Journal - Science and Technology

Due to harsh environment and vulnerability of marine ecosystems, many challenges are faced regarding offshore oil and gas activities. Many steps are currently undertaken to overcome such challenges.

As Lebanon is inside the new oil and gas sector in its offshore region, plans should be made to address environmental challenges that may occur in this sector. The Lebanese environmental governance system meets international standards in various aspects but some gaps are addressed to manage such risks that may be encountered with oil and gas activities in the Lebanese offshore. This article ends by a fast run through environmental regulatory authority, …

Removal Of Methylene Blue By Adsorption Of Water Hyacinth Derived Active Carbon Embedded With Cobalt Nanoparticles, Hany A. Elazab, A. O. Okasha, M. A. Radwan, M. A. Sadek, Amin Firouzi, Tamer T. El-Idreesy

Chemical and Biochemical Engineering Faculty Research & Creative Works

In this research, active carbon-based catalyst synthesis and characterization were tested for potential catalysts to be used in dye removal of methylene blue (MB). Water hyacinth is one of the major problems that is facing humankind and especially here in Egypt. One of the implications of industrial activities is environmental pollution. Dyes used in the production of textiles, paper, and clothes are one of the major pollutants. The waste of those dyes discharged into water supplies without treatment or with ineffective treatment harmfully impacts the environment. In this research, the treatment is implemented using active carbon-based catalysts using embedded nanoparticles. …