Publications by authors named "Zeinab Abbas Jawad"

5 Publications

  • Page 1 of 1

Modified Zeolite/Polysulfone Mixed Matrix Membrane for Enhanced CO/CH Separation.

Membranes (Basel) 2021 Aug 16;11(8). Epub 2021 Aug 16.

Department of Chemical Engineering, College of Engineering, Qatar University, Doha P.O. Box 2713, Qatar.

In recent years, mixed matrix membranes (MMMs) have received worldwide attention for their potential to offer superior gas permeation and separation performance involving CO and CH. However, fabricating defect-free MMMs still remains as a challenge where the incorporation of fillers into MMMs has usually led to some issues including formation of undesirable interfacial voids, which may jeopardize the gas separation performance of the MMMs. This current work investigated the incorporation of zeolite RHO and silane-modified zeolite RHO (NH-RHO) into polysulfone (PSf) based MMMs with the primary aim of enhancing the membrane's gas permeation and separation performance. The synthesized zeolite RHO, NH-RHO, and fabricated membranes were characterized by X-ray diffraction (XRD) analysis, Fourier transform infrared-attenuated total reflection (FTIR-ATR), thermogravimetric analysis (TGA) and field emission scanning election microscopy (FESEM). The effects of zeolite loading in the MMMs on the CO/CH separation performance were investigated. By incorporating 1 wt% of zeolite RHO into the MMMs, the CO permeability and ideal CO/CH selectivity slightly increased by 4.2% and 2.7%, respectively, compared to that of a pristine PSf membrane. On the other hand, a significant enhancement of 45% in ideal CO/CH selectivity was attained by MMMs incorporated with 2 wt% of zeolite NH-RHO compared to a pristine PSf membrane. Besides, all MMMs incorporated with zeolite NH-RHO displayed higher ideal CO/CH selectivity than that of the MMMs incorporated with zeolite RHO. By incorporating 1-3 wt% zeolite NH-RHO into PSf matrix, MMMs without interfacial voids were successfully fabricated. Consequently, significant enhancement in ideal CO/CH selectivity was enabled by the incorporation of zeolite NH-RHO into MMMs.
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http://dx.doi.org/10.3390/membranes11080630DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8401868PMC
August 2021

A Prospective Concept on the Fabrication of Blend PES/PEG/DMF/NMP Mixed Matrix Membranes with Functionalised Carbon Nanotubes for CO/N Separation.

Membranes (Basel) 2021 Jul 10;11(7). Epub 2021 Jul 10.

Department of Chemical Engineering, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar.

With an ever-increasing global population, the combustion of fossil fuels has risen immensely to meet the demand for electricity, resulting in significant increase in carbon dioxide (CO) emissions. In recent years, CO separation technology, such as membrane technology, has become highly desirable. Fabricated mixed matrix membranes (MMMs) have the most desirable gas separation performances, as these membranes have the ability to overcome the trade-off limitations. In this paper, blended MMMs are reviewed along with two polymers, namely polyether sulfone (PES) and polyethylene glycol (PEG). Both polymers can efficiently separate CO because of their chemical properties. In addition, blended N-methyl-2-pyrrolidone (NMP) and dimethylformamide (DMF) solvents were also reviewed to understand the impact of blended MMMs' morphology on separation of CO. However, the fabricated MMMs had challenges, such as filler agglomeration and void formation. To combat this, functionalised multi-walled carbon nanotube (MWCNTs-F) fillers were utilised to aid gas separation performance and polymer compatibility issues. Additionally, a summary of the different fabrication techniques was identified to further optimise the fabrication methodology. Thus, a blended MMM fabricated using PES, PEG, NMP, DMF and MWCNTs-F is believed to improve CO/nitrogen separation.
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http://dx.doi.org/10.3390/membranes11070519DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8303305PMC
July 2021

Particle swarm optimization and global sensitivity analysis for catalytic co-pyrolysis of Chlorella vulgaris and plastic waste mixtures.

Bioresour Technol 2021 Jun 23;329:124874. Epub 2021 Feb 23.

Energy and Environment Institute, University of Hull, Cottingham Road, Kingston upon Hull HU6 7RX, United Kingdom; B3 Challenge Group, Department of Chemical Engineering, University of Hull, Cottingham Road, Hull HU6 7RX, United Kingdom. Electronic address:

This study investigated on the co-pyrolysis of microalgae Chlorella vulgaris and high-density polyethylene (HDPE) waste mixtures which was performed with three types of catalysts, namely limestone (LS), HZSM-5 zeolite, and novel bi-functional LS/HZSM-5/LS. Kissinger-Kai (K-K) model-free method was coupled with Particle Swarm Optimization (PSO) model-fitting method using the thermogravimetric experimental data. A global sensitivity analysis was carried out using Latin Hypercube Sampling and rank transformation to assess the extent of impact of the input kinetic parameters on the output results. Furthermore, a thermodynamic analysis was performed to obtain parameters such as enthalpy change (ΔH), Gibb's free energy (ΔG), and entropy change (ΔS). The activation energy (E) of the microalgae Chlorella vulgaris and HDPE binary mixture were found to be lower upon the addition of catalysts. Among the catalyst used, bi-functional LS/HZSM-5 catalyst exhibited the lowest E (83.59 kJ/mol) and ΔH (78 kJ/mol) as compared to LS and HZSM-5 catalysts.
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http://dx.doi.org/10.1016/j.biortech.2021.124874DOI Listing
June 2021

Zeolite RHO Synthesis Accelerated by Ultrasonic Irradiation Treatment.

Sci Rep 2019 10 21;9(1):15062. Epub 2019 Oct 21.

Department of Chemical and Materials Engineering, Tamkang University, New Taipei City, 25137, Taiwan.

In recent years, there are increasing interest on applying ultrasonic irradiation for the synthesis of zeolite due to its advantages including remarkable shortened synthesis duration. In this project, the potential of ultrasonic irradiation treatment on the synthesis of zeolite RHO was investigated. Ultrasonic irradiation treatment time was varied from 30 to 120 minutes for the synthesis of zeolite RHO. The zeolite RHO solid samples were characterized with X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA) and nitrogen adsorption-desorption analysis. The application of ultrasonic irradiation treatment in this study has accelerated the synthesis of zeolite RHO where the synthesis duration has been significantly shortened to 2 days compared to 8 days required by conventional hydrothermal heating without ultrasonic irradiation treatment. Highly crystalline zeolite RHO crystals in truncated octahedron morphology were successfully formed.
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http://dx.doi.org/10.1038/s41598-019-51460-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6803675PMC
October 2019

Catalytic pyrolysis of Chlorella vulgaris: Kinetic and thermodynamic analysis.

Bioresour Technol 2019 Oct 22;289:121689. Epub 2019 Jun 22.

Department of Chemical Engineering, Faculty of Engineering and Science, Curtin University Malaysia, CDT 250, 98009 Miri Sarawak, Malaysia. Electronic address:

In the present study, catalytic pyrolysis of Chlorella vulgaris biomass was conducted to analyse the kinetic and thermodynamic performances through thermogravimetric approach. HZSM-5 zeolite, limestone (LS), bifunctional HZSM-5/LS were used as catalysts and the experiments were heated from 50 to 900 °C at heating rates of 10-100 °C/min. Iso-conversional model-free methods such as Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS), Starink's, and Vyazovkin (V) were employed to evaluate the kinetic parameters meanwhile the thermodynamic parameters were determined by using FWO and KAS methods. The calculated E values of non-catalytic and catalytic pyrolysis of HZSM-5 zeolite, LS, and bifunctional HZSM-5/LS were determined to be in the range of 156.16-158.10 kJ/mol, 145.26-147.84 kJ/mol, 138.81-142.06 kJ/mol, and 133.26 kJ/mol respectively. The results have shown that catalytic pyrolysis with the presence of bifunctional HZSM-5/LS resulted to a lower average E and ΔH compared to HZSM-5, and LS which indicated less energy requirement in the process.
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http://dx.doi.org/10.1016/j.biortech.2019.121689DOI Listing
October 2019
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