
Khaled A MahmoudHamad bin Khalifa University | HBKU · QEERI
Khaled A Mahmoud
PhD
About
175
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Introduction
Additional affiliations
May 2019 - present
July 2007 - August 2012
September 2012 - May 2019
Publications
Publications (175)
The improper disposal of agricultural food waste (AFW) and its associated plastic packaging significantly exacerbates environmental degradation, including pollution, greenhouse gas emissions, and loss of valuable resources, while imposing substantial economic burdens. These pressing challenges have spurred advancements in bioplastics as sustainable...
The rapid increase in global energy demand and the depletion of fossil fuels highlight the importance of biomass as a renewable energy source. Biomass, especially agricultural by-products rich in hemicellulose, cellulose, and lignin, offers a sustainable alternative for producing fuels and value-added products. The generation of power, heat, and bi...
Diminished ovarian reserve (DOR) and primary ovarian insufficiency (POI) are major causes of female infertility. We recently found a monogenic etiology in 29.3% of POI, leading to personalized medicine. The genetic landscape of DOR is unknown. A prospective study (2018–2023) of an international cohort of 120 patients with unexplained DOR was perfor...
To date, implantation is the rate-limiting step for the success of in vitro fertilization (IVF) treatment. Accumulating evidence suggests that immune cells contribute to embryo implantation, and several therapeutic approaches have been proposed for the treatment of recurrent implantation failure (RIF). Endometrial immune modulation with autologous...
Two-dimensional (2D) lamellar MXene membranes have demonstrated ultrafast water permeance, and outstanding ion rejection performance, thus showing great potential for water purification. However, as typical 2D lamellar structures, MXene membranes...
Severe environmental conditions can have a diverse impact on marine microorganisms, including bacteria. This can have an inevitable impact on the biofouling of membrane-based desalination plants. In this work, we have utilized indicator bacteria such as total coliform, fecal coliform, and Pseudomonas aeruginosa, as well as 16S rRNA sequencing, to i...
The growing global population and higher living standards instantly demand the transition in the direction of a sustainable food system. A substantial section of means and agricultural lands are presently committed to protein-rich feed production to rear livestock for human consumption. Conversely, accelerated farming activities and the food indust...
In this work, a novel Ti3C2Tx MXene/ chitosan/lignosulfonate adsorbent (MCL), was prepared via a facile decoration of Ti3C2Tx MXene sheets with chitosan/lignosulfonate nanospheres as a renewable and biodegradable additive that can improve the biocompatibility and aqueous stability of MXenes. Chitosan/lignosulfonate nanospheres were stabilized on th...
Severe environmental conditions can have a diverse impact on marine microorganisms, including bacteria. This can have an inevitable impact on the biofouling of membrane-based desalination plants. In this work, we have utilized the indicator bacteria such as total coliform, fecal coliform, and Pseudomonas aeruginosa and 16S rRNA sequencing to invest...
Transition metal carbides and nitrides, generally known as MXenes have emerged as an alternative to improve photocatalytic performance in renewable energy and environmental remediation applications because of their high surface area, tunable chemistry, and easily adjustable elemental compositions. MXenes have many interlayer groups, surface group o...
Background
Primary Ovarian Insufficiency (POI), a public health problem, affects 1-3.7% of women under 40 yielding infertility and a shorter lifespan. Most causes are unknown. Recently, genetic causes were identified, mostly in single families. We studied an unprecedented large cohort of POI to unravel its molecular pathophysiology.
Methods
375 pa...
The apparent uncertainty associated with shedding patterns, environmental impacts, and sample processing strategies have greatly influenced the variability of SARS-CoV-2 concentrations in wastewater. This study evaluates the use of a new normalization approach using human RNase P for the logic estimation of SARS-CoV-2 viral load in wastewater. SARS...
Obstacles in the membrane-based separation field are mainly related to membrane fouling. This study involved the synthesis and utilization of covalently crosslinked MXene/cellulose acetate mixed matrix membranes with MXene at different concentrations (CCAM-0% to CCAM-12%) for water purification applications. The membranes’ water flux, dye, and prot...
An electrochemical aptasensor was designed for the ultraselective and sensitive detection of Pb2+ by using lead‐specific binding DNA oligonucleotide as the molecular recognition element on Au nanoparticles/Nb4C3Tx MXene (Au@Nb4C3Tx) modified electrode. The Au@Nb4C3Tx is conjugated with thiol‐modified lead‐binding DNA through the Au‐S bond. The DNA‐...
In recent years, tremendous interest has been generated in MXenes as a fast-growing and diversified family of two-dimensional (2D) materials with a wide range of potential uses. MXenes exhibit many unique structural and physicochemical properties that make them particularly attractive as adsorbents for removing heavy metals from aqueous media, incl...
Our environment desperately needs creative solutions to limit the effect of industrialization’s fast rise and, consequently, to remediate vast amounts of harmful by-products and toxic exhausts [...]
An enhanced water flux and anti-fouling nanocomposite ultrafiltration membrane based on quaternary ammoniumpropylated polysilsesquioxane (QAPS)/cellulose acetate ([email protected]) was fabricated by in situ sol-gel processing via phase inversion followed by quaternization with methyl iodide (CH3I). Membrane characterizations were performed based o...
Due to their broad applications in various industrial activities, and their well-known negative impacts on the aquatic environment, organic dyes have been continuously identified as serious threat to the quality of ecosystems. The photocatalytic degradation process in aqueous solutions has emerged as an efficient and reliable approach for the remov...
Sulfate-reducing bacteria (SRBs) induced biofilm formation is a global industrial concern due to its role in the development of microbial-induced corrosion (MIC). Herein, we have developed a biodegradable chitosan/lignosulfonate nanocomposite ([email protected]) as an efficient green biocide for the inhibition of SRBs biofilms. We investigated in d...
Majority of the corrosion inhibition studies of microbially influenced corrosion (MIC) have been carried out in the static mode conditions. Considering the constant flow similar to industrial pipelines, the dynamic systems for the corrosion inhibition analysis provide more accurate investigation of pipeline corrosion. Towards this aspect, we have a...
In this study, we reveal the microbiologically influenced corrosion (MIC) behavior of the new electroless NiP-TiNi nanocomposite coating in simulated seawater using the electrochemical impedance spectroscopy (EIS) technique after different periods of incubation time (7, 10, 14, 21, 28 days) in a sulfate-reducing bacteria (SRB) medium. The biofilm f...
Study question
Would the use of theophylline have an effect on ICSI outcomes?
Summary answer
The cumulative pregnancy rate after the transfer of fresh and frozen embryos (FET) becomes more important justifying the addition of theophylline as an efficacy variable.
What is known already
Absolute immotile spermatozoa is one of the most important cau...
The properties of two-dimensional (2D) layered membrane systems can be medullated by the stacking arrangement and the heterostructure composition of the membrane. This largely affects the performance and stability of such membranes. Here, we have used first-principle density functional theory calculations to conduct a comparative study of two heter...
Highly conductive materials, with minimal thickness and capable to afford electromagnetic interference (EMI) shielding, are highly advantageous, particularly if they are able to be easily processed into thin films. Here, we demonstrate the potential of a sandwich-like structure of a two-dimensional Ti3C2Tx MXene/Graphene nanoplatelets (GNPs) compos...
Raw municipal wastewater from five wastewater treatment plants representing the vast majority of the Qatar population was sampled between the third week of June 2020 and the end of August 2020, during the period of declining cases after the peak of the first wave of infection in May 2020. The N1 region of the SARS-CoV-2 genome was used to quantify...
This paper evaluates the electrochemical performance of platinum nanoparticles/Ti3C2Tx nanocomposite ([email protected]3C2Tx) towards environmental sensing applications. The nanocomposite was prepared by self-reduction of Pt salt to Pt nanoparticles (PtNPs) on the surface of delaminated Ti3C2Tx nanosheets, in which Ti3C2Tx simultaneously acted as r...
In this study, Ti3C2Tx (MXene) was used to enhance the fouling resistance of FO flat-thin film membranes. Mixed-matrix Ti3C2Tx (MXene)/ cellulose acetate (CA) membranes with different (wt%) loading of MXene were fabricated by covalent crosslinking followed by phase inversion protocol. The fabricated membranes were characterized by scanning electron...
Microbiologically Influenced Corrosion (MIC) has been recognized as a widespread problem in the oil and gas industries because it causes substantial economic losses. Sulfate reducing bacteria (SRB) is one of the essential microorganisms families that have always been linked to MIC mechanisms causing localized corrosion problems. Since the bacterial...
Two-dimensional (2D) MXenes have demonstrated outstanding antimicrobial properties owing to their unique physiochemical properties and ultrathin lamellar structure. However, the relationship between MXene sheet size and their antimicrobial activity and how the atomic structure can impact the antibacterial mechanism are yet to be revealed. This stud...
The rapid transmission tendency, severity, and wide geographical spread of newly emerged novel coronavirus (SARS-CoV-2) in different environmental matrices, including water, air, and soil, has posed severe health, environmental, energy, and economic challenges worldwide. Despite the severe health effects, unprecedented improvements in air quality i...
From acidic NiP electroless bath, the co-deposition of TiNi nanoparticles in the NiP matrix to form novel NiP-TiNi nanocomposite coatings (NCCs) on top of API X100 carbon steel using several concentrations of TiNi nanoparticles (0.2, 0.4 and 0.8 g L-1 in the bath) is successfully achieved. The influence of the TiNi nanoparticles on the composition,...
VARICOCELE INDUCE OXIDATIVE STRESS AND SPERM DNA DAMAGES IN INFERTILES PATIENTS Mariem ben Khelifa, PhD, Hanen Elloumi, Dr, Sonia Mnallah, Dr, med Habib BEN Aribia, Dr, Mohamed Khrouf, Dr, Fethi Zhioua, Dr, Khaled Terras, Dr, Moncef Benkhalifa, PhD and Khaled Mahmoud, Dr, FERTILLIA center, Tunis, QC, Tunisia
Abstract Text:
OBJECTIVE:
Varicocel...
76th Scientific Congress of the American-Society-for-Reproductive-Medicine, ELECTR NETWORK, OCT 17-21, 2020
In this work, we study the electrochemical performance of Nb2CTx and Nb4C3Tx MXenes in aqueous media and their application as a sensing platform for small biomolecules. Both Nb2CTx and Nb4C3Tx are electrochemically stable up to an anodic potential of 0.5 V. It was found that Nb4C3Tx is more electrochemically active than Nb2CTx. Based on this, Nb4C3...
Intercalation redox materials have shown great promise for efficient water desalination due to available Faradaic gallery sites. Symmetric capacitive deionization (CDI) cells previously demonstrated using MXenes were often limited in their salt adsorption capacity and voltage window of operation. In this study, current collector‐ and binder‐free Ti...
A Nb4C3Tx (MXene)-modified glassy carbon electrode was used for the electrochemical detection of Pb²⁺ ions in aqueous media. The sensing platform was evaluated by anodic stripping analysis after optimizing the influencing factors such as pH, deposition potential, and time. The large interlayer spacing, high c lattice parameter and higher conductivi...
In this work, uniform cross-linked chitosan/lignosulfonate (CS/LS) nanospheres with an average diameter of 150–200 nm have been successfully used as a novel, environmentally friendly biocide for the inhibition of mixed sulfate-reducing bacteria (SRB) culture, thereby controlling microbiologically influenced corrosion (MIC) on carbon steel. It was f...
A new fouling-resistant mixed-matrix nanofiltration membrane based on covalently cross-linked Ti3C2TX (MXene)/cellulose acetate ([email protected]) was fabricated by phase inversion followed by formaldehyde cross-linking. The physicochemical properties of the prepared [email protected] membranes were studied by field emission scanning electron micr...
Introduction of new nanomaterials with conductivity, salt adsorption capacity (SAC) and rate (SAR) exceeding that of carbon electrodes may greatly improve capacitive deionization of water. However, those materials show a different electrochemical behavior, which must be studied and optimized for practical use. Here, effects of operating conditions...
Herein, renewable and uniform nanospheres based on chitosan (CS) and lignosulfonate (LS): (CS@LS) were designed for the first time through a simple one-step covalent cross-linking protocol. Experimental and theoretical evidences have proven the self-assembled structure of the nanospheres as a binary network between CS and LS. The optimum composite...
Since the first discovery of two-dimensional (2D) MXenes, about 30 different structures of this group have been synthesized to date. Owing to their unique mechanical, chemical, and electrical properties, many successful attempts have been focused on using MXenes in water treatment and environmental remediation applications. However, more efforts ar...
Torch-plasma-grown single-walled carbon nanotubes (SWCNTs) are integrated with regioregular poly(3-hexylthiophene) (P3HT) and a fullerene derivative 1-(3-methoxycarbonyl) propyl-1-phenyl[6,6]C61 (PCBM) as a hybrid photoactive layer for bulk heterojunction solar cell devices. We demonstrate that molecular information could be accurately obtained by...
MXenes showed great promise as gas separation and water purification membranes. It was proposed that MXene can reject ions by both charge and size sieving mechanisms. Generally, it is expected that the interlayer spacing between the MXene nanosheets acts as a trap for the ions and the negatively charged surface of MXene allows for spontaneous inter...
The control of microbiologically influenced corrosion (MIC) is
of great significance in many industrial applications.
Attention has been devoted to emerging nanomaterials as
‘green’ biocides for their remarkable antimicrobial function
and relatively low environmental risk. Understanding the
antimicrobial inhibition mechanisms is the key to increase...
Rapid and real-time detection of L-Cysteine (L-Cys) is important for early diagnostics of several diseases and biological disorders. We report here a stable and highly sensitive electrochemical sensor for the detection of L-Cys based on Pd@Ti3C2Tx (MXene)-modified glassy carbon electrode (GCE). The Pd@Ti3C2Tx nanocomposite was prepared by in situ r...
The 2D transition metal carbides (MXenes) are increasingly considered among of the most promising 2D nanomaterials, because of their unique properties such as hydrophilic nature, metallic conductivity, large surface-area-to-volume ratio, and active surface functionalities. This has led to their growing utilization in water/wastewater treatment and...
Purpose
Here, we fabricated two plasmonic 2D Ti3C2Tx-based nanocomposites (Au/MXene and Au/Fe3O4/MXene) with similarly high anti-cancer photothermal therapy (PTT) capabilities, but with less in vivo toxicity than a pure MXene.
Methods
Au/MXene was synthesized by in situ reduction of tetrachloroauric acid using NaBH4 on Ti3C2Tx flakes. For targeted...
The discovery of two-dimensional (2D) transition metal carbides and nitrides (MXenes) in 2011 has
expanded the pool of nanomaterials available for a variety of applications. Characteristic properties of
MXenes, such as high conductivity, hydrophilicity, and catalytic activity have led to a growing
research interest for their use in environmental re...
The scalable fabrication of flexible membranes for efficient oil/water separation is in high demand but still significantly underdeveloped. Here, we present a flexible membrane using Ti3C2T x (MXene) as the functional layer on conventional print paper as the substrate. With a simple coating process using MXene ink, we developed a highly hydrophilic...
From acidic NiP electroless bath, the co-deposition of TiNi nanoparticles in the NiP matrix to form novel NiP-TiNi nanocomposite coatings (NCCs) on top of API X100 carbon steel using several concentrations of TiNi nanoparticles (0.2, 0.4 and 0.8 g L ⁻¹ in the bath) is successfully achieved. The influence of the TiNi nanoparticles on the composition...