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Article ; Online: Formic Acid Dehydrogenation Using Noble-Metal Nanoheterogeneous Catalysts

Abbas Al-Nayili / Hasan Sh. Majdi / Talib M. Albayati / Noori M. Cata Saady

Catalysts, Vol 12, Iss 324, p

Towards Sustainable Hydrogen-Based Energy

2022 Volume 324

Abstract: The need for sustainable energy sources is now more urgent than ever, and hydrogen is significant in the future of energy. However, several obstacles remain in the way of widespread hydrogen use, most of which are related to transport and storage. Dilute ...

Abstract	The need for sustainable energy sources is now more urgent than ever, and hydrogen is significant in the future of energy. However, several obstacles remain in the way of widespread hydrogen use, most of which are related to transport and storage. Dilute formic acid (FA) is recognized asa a safe fuel for low-temperature fuel cells. This review examines FA as a potential hydrogen storage molecule that can be dehydrogenated to yield highly pure hydrogen (H 2 ) and carbon dioxide (CO 2 ) with very little carbon monoxide (CO) gas produced via nanoheterogeneous catalysts. It also present the use of Au and Pd as nanoheterogeneous catalysts for formic acid liquid phase decomposition, focusing on the influence of noble metals in monometallic, bimetallic, and trimetallic compositions on the catalytic dehydrogenation of FA under mild temperatures (20–50 °C). The review shows that FA production from CO 2 without a base by direct catalytic carbon dioxide hydrogenation is far more sustainable than existing techniques. Finally, using FA as an energy carrier to selectively release hydrogen for fuel cell power generation appears to be a potential technique.
Keywords	nanoheterogeneous catalysts ; formic acid (FA) ; dehydrogenation ; chemical hydrogen storage ; hydrogen economy ; sustainable energy ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
Subject code	540
Language	English
Publishing date	2022-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Predictive modeling and computational machine learning simulation of adsorption separation using advanced nanocomposite materials

Xuefang Hu / Fahad Alsaikhan / Hasan Sh. Majdi / Dmitry Olegovich Bokov / Abdullah Mohamed / Arash Sadeghi

Arabian Journal of Chemistry, Vol 15, Iss 9, Pp 104062- (2022)

2022

Abstract: Adsorption process was simulated in this study for removal of Hg and Ni from water using nanocomposite materials. The used nanostructured material for the adsorption study was a combined MOF and layered double hydroxide, which is considered as MOF-LDH in ...

Abstract	Adsorption process was simulated in this study for removal of Hg and Ni from water using nanocomposite materials. The used nanostructured material for the adsorption study was a combined MOF and layered double hydroxide, which is considered as MOF-LDH in this work. The data were obtained from resources and different machine learning models were trained. We selected three different regression models, including elastic net, decision tree, and Gradient boosting, to make regression on the small data set with two inputs and two outputs. Inputs are Ion type (Hg or Ni) and initial ion concentration in the feed solution (C0), and outputs are equilibrium concentration (Ce) and equilibrium capacity of the adsorbent (Qe) in this dataset. After tuning their hyper-parameters, final models were implemented and assessed using different metrics. In terms of the R2-score metric, all models have more than 0.97 for Ce and more than 0.88 for Qe. The Gradient Boosting has an R2-score of 0.994 for Qe. Also, considering RMSE and MAE, Gradient Boosting shows acceptable errors and best models. Finally, the optimal values with the GB model are identical to dataset optimal: (Ion = Ni, C0 = 250, Ce = 206.0). However, for Qe, it is different and is equal to (Ion = Hg, C0 = 121.12, Ce = 606.15). The results revealed that the developed methods of simulation are of high capacity in prediction of adsorption for removal of heavy metals using nanostructure materials.
Keywords	Adsorption ; Nanocomposites ; Separation ; Machine learning ; Heavy metals ; Chemistry ; QD1-999
Language	English
Publishing date	2022-09-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Study of the Impact of Tube Configurations on the Local Heat Transfer Coefficient in Mimicked Fischer-Tropsch Bubble Column Reactor

Abdulrazaq Nadhim Alzamily / Abbas J. Sultan / Amer A. Abdulrahman / Hasan Sh. Majdi

Processes, Vol 10, Iss 976, p

2022 Volume 976

Abstract: An experimental investigation was conducted to examine, for the first time, the influences of using different designs of tube arrangements on the local heat transfer coefficient (LHTC) in a bubble column (with a diameter of 0.13 m) equipped densely with ... ...

Abstract	An experimental investigation was conducted to examine, for the first time, the influences of using different designs of tube arrangements on the local heat transfer coefficient (LHTC) in a bubble column (with a diameter of 0.13 m) equipped densely with a bundle of tubes. The effect of using two different designs of tube arrangements has been examined for a broad range of gas flow rates using a sophisticated heat transfer technique. The obtained results indicate that the LHTC increases significantly with increasing the gas velocity, regardless of the design and installation of the tubes in the column. Additionally, the shape of the LHTC’s profiles alters considerably by the presence of a bundle of tubes and their arrangements. Moreover, the results indicate that the square tube pitch arrangement provides uniform heat transfer profiles, which enhance the performance of the bubble column reactor by 30%. Furthermore, the heat transfer profiles were found to be varied with the axial height of the column. The new experimental results obtained in this investigation will provide experimental reference data for creating and validating a mathematical model for predicting LHTCs. In addition, this will facilitate this kind of reactor’s design, scale-up, and operation.
Keywords	bubble column ; tube configurations ; heat transfer coefficient ; Fischer-Tropsch process ; bundle of heat exchanging tubes ; sophisticated heat transfer technique ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
Subject code	621
Language	English
Publishing date	2022-05-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Schiff-base ligand assisted synthesis of DyVO4/AgBr nanocomposites, characterization, and investigation of photocatalytic activity over organic dye contaminants

Mohammad Hossein Khorasanizadeh / Rozita Monsef / Masoud Salavati-Niasari / Hasan Sh. Majdi / Waleed Khalid Al-Azzawi / Furqan S. Hashim

Arabian Journal of Chemistry, Vol 16, Iss 8, Pp 105020- (2023)

2023

Abstract: In the current study, a type-I DyVO4/AgBr heterojunction was prepared by a simple and cost-effective co-precipitation method to obtain a highly efficient photocatalyst for water treatment. The effect of different molar ratios of H2Salen to dysprosium and ...

Abstract	In the current study, a type-I DyVO4/AgBr heterojunction was prepared by a simple and cost-effective co-precipitation method to obtain a highly efficient photocatalyst for water treatment. The effect of different molar ratios of H2Salen to dysprosium and temperature reaction was studied on the morphology of the products. As a result of the energy savings, the optimal temperature for the preparation of DyVO4 nanoparticles was chosen as 25 °C, and DyVO4/AgBr nanocomposites were prepared at this temperature. The XRD results revealed that DyVO4 and DyVO4/AgBr nanocomposites were pure in all conditions. A comparative study was conducted between the photocatalytic behavior of DyVO4, AgBr, and DyVO4/AgBr under UV and visible radiation. The photodegradation result reveals that DyVO4/AgBr performs better than pure DyVO4 and AgBr. 79.8% and 72.0% of methylene blue (MB) were degraded by DyVO4/AgBr nanocomposites under UV and visible light after 90 min, respectively. The kinetics study depicts that the higher reaction constant rate (k = 0.0187 min−1) belongs to DyVO4/AgBr nanocomposite that has the maximum photodegradation.
Keywords	DyVO4/AgBr Nanocomposite ; Co-precipitation ; Nanostructures ; UV–Visible Photocatalyst ; Optical degradation ; Chemistry ; QD1-999
Subject code	660
Language	English
Publishing date	2023-08-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Effect of Electrode Material and Hydrodynamics on the Produced Current in Double Chamber Microbial Fuel Cells

Marwa S. Hamed / Hasan Sh. Majdi / Basim O. Hasan

ACS Omega, Vol 5, Iss 18, Pp 10339-

2020 Volume 10348

Keywords	Chemistry ; QD1-999
Language	English
Publishing date	2020-04-01T00:00:00Z
Publisher	American Chemical Society
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Adsorption of methyl violet dye onto a prepared bio-adsorbent from date seeds

Nisreen S. Ali / Noor M. Jabbar / Saja M. Alardhi / Hasan Sh. Majdi / Talib M. Albayati

Heliyon, Vol 8, Iss 8, Pp e10276- (2022)

isotherm, kinetics, and thermodynamic studies

2022

Abstract: Raw date seeds, as prospective natural, broadly obtainable and low-price agricultural waste for adsorbing cationic dyes from aqueous solutions, have been studied. In this work, Iraqi date seeds were prepared and characterised using X-ray diffraction (XRD) ...

Abstract	Raw date seeds, as prospective natural, broadly obtainable and low-price agricultural waste for adsorbing cationic dyes from aqueous solutions, have been studied. In this work, Iraqi date seeds were prepared and characterised using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and Brunauer–Emmett–Teller (BET) surface area analysis before being used as an efficient bio-adsorbent for methyl violet (MV) dye removal. Adsorption tests were conducted with three investigated parameters, namely, time of contact, first adsorbate concentration and adsorbent dose. Compared with the pseudo first-order model (coefficient of determination = 0.9001), the pseudo second-order model was determined to be the best-fitting model with a coefficient of determination (R2) of 0.9917. The equilibrium isotherms for MV were obtained, and their ultimate capacity of adsorption was (59.5 mg g1). Two isotherm models, Langmuir and Freundlich, were studied to fit the equilibrium data. Compared with the Freundlich isotherm model (R2 = 0.8154), the Langmuir model functioned better as an adsorption isotherm with R2 of 0.9837. In addition, the adsorption process was endothermic and spontaneous. The date seeds acted as active adsorbents to remove MV from the aqueous solutions in the model experiments.
Keywords	Wastewater treatment ; Environmental pollution ; Methyl violet dyes ; Batch adsorption ; Date seeds characterisations ; Adsorption isotherms ; Science (General) ; Q1-390 ; Social sciences (General) ; H1-99
Subject code	541
Language	English
Publishing date	2022-08-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Sonochemical synthesis and characterization of Ho-Cu-O nanostructures and their application as photocatalyst for degradation of water-soluble organic pollutants under UV light

Seyed Milad Tabatabaeinejad / Hossein Safardoust-Hojaghan / Mojgan Ghanbari / Hasan Sh. Majdi / Shuaib M. Abdulnabi / Furqan S. Hashim / Anmar Ghanim Taki / Masoud Salavati-Niasari

Arabian Journal of Chemistry, Vol 16, Iss 6, Pp 104768- (2023)

2023

Abstract: Water pollutants have been a significant concern in recent years. It is essential to use advanced materials that effectively reduce these pollutants. This work introduces Ho2Cu2O5/Ho2O3 nanocomposites as a novel catalyst for photodegradation of various ... ...

Abstract	Water pollutants have been a significant concern in recent years. It is essential to use advanced materials that effectively reduce these pollutants. This work introduces Ho2Cu2O5/Ho2O3 nanocomposites as a novel catalyst for photodegradation of various water-soluble organic pollutants. First, Ho2Cu2O5/Ho2O3 nanocomposites were prepared via a simple and fast ultrasonic-assisted route. The chemical and morphological features of the as-synthesized sample were determined using VSM, FTIR, XRD, EDS, SEM, and TEM analysis. Also, the optical bandgaps and pore diameter were determined to be 3.1, 3.6 eV, and 12.74 nm via ultraviolet–visible diffuse reflectance spectroscopy and Brunauer-Emmett-Teller (BET) for Ho2Cu2O5 and Ho2O3, respectively. The findings revealed that the prepared nanocomposite could act as a photocatalyst for removing various organic pollutants from water. 93.01% and 92% of Eriochrome black T (ECBT) and Acid yellow (AY) were degraded under UV irradiation at optimum conditions after 120 min (0.03 g of photocatalyst and 10 ppm of pollutants). The kinetics of the ECBT removal was studied through the Langmuir-Hinshelwood model, and the apparent rate of the pseudo-first-order reaction (k = 0.03465 min−1) was obtained. The use of different scavengers made it clear that formation •O2– species were primarily responsible for the photodegradation of pollutants.
Keywords	Ho2Cu2O5/Ho2O3 Nanocomposites ; Nanophotocatalyst ; Nanostructures ; Scavenger ; Water pollutants ; Chemistry ; QD1-999
Subject code	540
Language	English
Publishing date	2023-06-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Photocatalytic Organic Contaminant Degradation of Green Synthesized ZrO 2 NPs and Their Antibacterial Activities

Parvathiraja Chelliah / Saikh Mohammad Wabaidur / Hari Prapan Sharma / Hasan Sh. Majdi / Drai Ahmed Smait / Mohammed Ayyed Najm / Amjad Iqbal / Wen-Cheng Lai

Separations, Vol 10, Iss 156, p

2023 Volume 156

Abstract: The green synthesis of metal oxide nanoparticles is an efficient, simple, and chemical-free method of producing nanoparticles. The present work reports the synthesis of Murraya koenigii -mediated ZrO 2 nanoparticles (ZrO 2 NPs) and their applications as ... ...

Abstract	The green synthesis of metal oxide nanoparticles is an efficient, simple, and chemical-free method of producing nanoparticles. The present work reports the synthesis of Murraya koenigii -mediated ZrO 2 nanoparticles (ZrO 2 NPs) and their applications as a photocatalyst and antibacterial agent. Capping and stabilization of metal oxide nanoparticles were achieved by using Murraya koenigii leaf extract. The optical, structural, and morphological valance of the ZrO 2 NPs were characterized using UV-DRS, FTIR, XRD, and FESEM with EDX, TEM, and XPS. An XRD analysis determined that ZrO 2 NPs have a monoclinic structure and a crystallite size of 24 nm. TEM and FESEM morphological images confirm the spherical nature of ZrO 2 NPs, and their distributions on surfaces show lower agglomerations. ZrO 2 NPs showed high optical absorbance in the UV region and a wide bandgap indicating surface oxygen vacancies and charge carriers. The presence of Zr and O elements and their O=Zr=O bonds was categorized using EDX and FTIR spectroscopy. The plant molecules’ interface, bonding, binding energy, and their existence on the surface of ZrO2 NPs were established from XPS analysis. The photocatalytic degradation of methylene blue using ZrO 2 NPs was examined under visible light irradiation. The 94% degradation of toxic MB dye was achieved within 20 min. The antibacterial inhibition of ZrO 2 NPs was tested against S. aureus and E. coli pathogens. Applications of bio-synthesized ZrO 2 NPs including organic substance removal, pathogenic inhibitor development, catalysis, optical, and biomedical development were explored.
Keywords	ZrO 2 NPs ; green synthesis ; photocatalysis ; bacterial activity ; Murraya koenigii ; Physics ; QC1-999 ; Chemistry ; QD1-999
Subject code	540
Language	English
Publishing date	2023-02-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Recovery of fuel from real waste oily sludge via a new eco-friendly surfactant material used in a digital baffle batch extraction unit

Jasim I. Humadi / Saad A. Jafar / Nisreen S. Ali / Mustafa A. Ahmed / Mohammed J. Mzeed / Raheem J. Al-Salhi / Noori M. Cata Saady / Hasan Sh. Majdi / Sohrab Zendehboudi / Talib M. Albayati

Scientific Reports, Vol 13, Iss 1, Pp 1-

2023 Volume 14

Abstract: Abstract This study focused on developing a new cocktail extraction agent (CEA) composed of solvent and a new surfactant material (SM) for enhancing the efficiency of fuel recovery from real waste oil sludge (WSO). The effects of different solvents (e.g. ...

Abstract	Abstract This study focused on developing a new cocktail extraction agent (CEA) composed of solvent and a new surfactant material (SM) for enhancing the efficiency of fuel recovery from real waste oil sludge (WSO). The effects of different solvents (e.g. methyl ethyl ketone (MEK), naphtha, petrol and kerosene), SMs (Dowfax and sodium thiosulfate), extraction time (10–20 min), extraction temperatures (20–60 °C) and CEA/sludge ratios (1–4) on the extraction performance were investigated. SMs and DBBE design enhanced the extraction efficiency by increasing the dispersion of solvent in WSO and enhancing the mixing and mass transfer rates. Results proved that Dowfax was the best SM for oil recovery under various conditions. The best CEA (e.g. MEK and Dowfax) provides the maximum fuel recovery rate of 97% at a period of 20 min, temperature of 60 °C and 4:1 CEA/sludge ratio. The produced fuel was analysed and fed to the distillation process to produce diesel oil. The characteristics of diesel oil were measured, and findings showed that it needs treatment processes prior its use as a finished fuel.
Keywords	Medicine ; R ; Science ; Q
Subject code	660
Language	English
Publishing date	2023-06-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Investigation of Heat Transfer Enhancement in a Triple Tube Latent Heat Storage System Using Circular Fins with Inline and Staggered Arrangements

Xinguo Sun / Hayder I. Mohammed / Mohammadreza Ebrahimnataj Tiji / Jasim M. Mahdi / Hasan Sh. Majdi / Zixiong Wang / Pouyan Talebizadehsardari / Wahiba Yaïci

Nanomaterials, Vol 11, Iss 2647, p

2021 Volume 2647

Abstract: Inherent fluctuations in the availability of energy from renewables, particularly solar, remain a substantial impediment to their widespread deployment worldwide. Employing phase-change materials (PCMs) as media, saving energy for later consumption, ... ...

Abstract	Inherent fluctuations in the availability of energy from renewables, particularly solar, remain a substantial impediment to their widespread deployment worldwide. Employing phase-change materials (PCMs) as media, saving energy for later consumption, offers a promising solution for overcoming the problem. However, the heat conductivities of most PCMs are limited, which severely limits the energy storage potential of these materials. This study suggests employing circular fins with staggered distribution to achieve improved thermal response rates of PCM in a vertical triple-tube heat exchanger involving two opposite flow streams of the heat-transfer fluid (HTF). Since heat diffusion is not the same at various portions of the PCM unit, different fin configurations, fin dimensions and HTF flow boundary conditions were explored using computational studies of melting in the PCM triple-tube system. Staggered configuration of fin distribution resulted in significant increases in the rates of PCM melting. The results indicate that the melting rate and heat charging rate could be increased by 37.2 and 59.1%, respectively, in the case of staggered distribution. Furthermore, the use of lengthy fins with smaller thickness in the vertical direction of the storage unit resulted in a better positive role of natural convection; thus, faster melting rates were achieved. With fin dimensions of 0.666 mm × 15 mm, the melting rate was found to be increased by 23.6%, when compared to the base case of 2 mm × 5 mm. Finally, it was confirmed that the values of the Reynolds number and inlet temperatures of the HTF had a significant impact on melting time savings when circular fins of staggered distribution were included.
Keywords	staggered and inline fins ; fins’ dimensions ; phase-change material ; thermal energy storage ; melting ; Chemistry ; QD1-999
Subject code	612 ; 621
Language	English
Publishing date	2021-10-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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