Article
Engineering, Chemical
Zeyu Jiang, Shengying Zhao, Yuhao Yang, Minghui Tan, Guohui Yang, Yisheng Tan
Summary: In this study, a series of Ce-BTC MOF-derived nanorod CeO2 catalysts were prepared for the direct synthesis of DMC from CO2 and methanol. The calcination atmosphere had a great impact on the structure and catalytic properties of the obtained CeO2 catalysts. CeO2 derived from calcination under H2 atmosphere at 500 degrees C exhibited higher specific surface area, oxygen vacancy concentration, and CO2 adsorption capacity, leading to a significantly higher DMC yield compared to commercial nano CeO2 and other prepared catalysts without dehydrating agents.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Keng Xuan, Shikun Chen, Yanfeng Pu, Yaoping Guo, Yadan Guo, Yun Li, Chenxi Pu, Ning Zhao, Fukui Xiao
Summary: In this study, a HPW@MOF-808 catalyst was successfully prepared and demonstrated to have high activity and good stability in the direct synthesis of DMC. The encapsulation of HPW in the micropores of MOF-808 increased its interaction with Zr-6 nodes, resulting in the generation of more acid sites and promoting the formation of methyl cations (rate-determine step in DMC synthesis). Additionally, the encapsulated HPW inhibited leaching during the reaction, leading to better reusability.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Chemistry, Multidisciplinary
Linmeng Huo, Lin Wang, Jingjie Li, Yanfeng Pu, Keng Xuan, Congzhen Qiao, Hao Yang
Summary: The disadvantage of Ce/Zr metal oxide catalyst for direct synthesis of dimethyl carbonate (DMC) from CO2 and methanol, low DMC formation rate due to low specific surface area and active sites, can be improved by highly uniform dispersion cerium-doped UiO-66 MOFs. Experimental evaluation results showed that Ce-doped UiO-66 MOFs exhibited significantly improved catalytic performance compared to traditional Ce/Zr metal oxide catalyst.
JOURNAL OF CO2 UTILIZATION
(2023)
Article
Biochemistry & Molecular Biology
Guoqiang Zhang, Yuan Zhou, Yanlin Yang, Tiantian Kong, Ya Song, Song Zhang, Huayan Zheng
Summary: The role of surface Ce4+ and oxygen vacancies in the catalytic activity for direct synthesis of dimethyl carbonate (DMC) from CO2 and methanol was investigated. Reduction treatment promoted the conversion of Ce4+ to Ce3+ and increased the concentration of surface oxygen vacancies, while reoxidation treatment facilitated the conversion of Ce3+ to Ce4+ and reduced the concentration of surface oxygen vacancies. The catalytic activity was influenced by the number of moderate acidic/basic sites and the surface concentration of Ce4+ and oxygen vacancies.
Article
Chemistry, Physical
Ashif H. Tamboli, Norihiro Suzuki, Chiaki Terashima, Suresh Gosavi, Hern Kim, Akira Fujishima
Summary: This study presents a method for producing DMC from major greenhouse gases and CeO2 using various morphologies of cerium oxide (CeO2), and investigates the impact of CeO2 morphology on its catalytic performance, with spindle shape CeO2 identified as the most active catalyst for DMC synthesis.
Article
Green & Sustainable Science & Technology
W. Donphai, O. Phichairatanaphong, R. Fujii, P. Li, T. Chang, M. Yabushita, Y. Nakagawa, K. Tomishige
Summary: Direct synthesis of dimethyl carbonate (DMC) is an environmentally-friendly process that utilizes CO2 as a source of useful chemicals. Various CeO2 catalysts with different properties have been employed for this reaction. In this study, CeO2 catalysts prepared via specific methods showed the highest DMC yield under certain conditions, comparable to previously reported values.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Chemistry, Physical
Yanqing Chen, Seyed Mohsen Sadeghzadeh
Summary: An advanced dandelion-like TiO2 material with anatase/TiO2 phase interface and high specific outer layer was successfully synthesized via a convenient and eco-friendly method. The uniform dispersion of doped IL/Mo132 DFNT-based metal-organic frameworks improved the low specific outer layer and less active sites issue.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Warangthat Kriprasertkul, Thongthai Witoon, Pattaraporn Kim-Lohsoontorn
Summary: This study investigated the two steps of dimethyl ether (DME) synthesis from CO2 and H-2, including CO2 hydrogenation to methanol through ethanol-assisted method and methanol dehydration to DME. The addition of ZrO2, Al2O3, and ZrO(2)eAl(2)O(3) into Cu/ZnO catalyst was studied, and suitable zeolite for methanol dehydration was determined. The results showed that ethanol-assisted method and the Cu/ZnO/ZrO2 catalyst provided high methanol yield and CO2 conversion. Ferrierite zeolite exhibited the highest DME productivity. The synthesis of DME and ethylene from CO2 and H-2 through ethanol-assisted methanol synthesis and methanol dehydration has potential applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Linyuan Tian, Zicong Tan, Quan Wang, Yin -Song Liao, Jyh-Pin Chou, Jyh-Ming Wu, Guoliang Liu, Yung-Kang Peng
Summary: By studying single-crystalline CeO2 catalysts, it was found that methanol is the key species activated by surface Ce sites to produce methyl carbonate (MC) and dimethyl carbonate (DMC). The reactivity of surface methoxy species towards CO2 depends on the Ce coordination structures. Head-to-head terminal methoxy species converts CO2 to MC faster than atilt counterparts, resulting in higher DMC activity. The bridging methoxy species is too stable to react with CO2. The established structure-activity relation can also guide the design of CeO2-based catalysts in other reactions involving methanol activation.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Energy & Fuels
Shiping Chen, Xin Li, Liqin Lin, Xiaolian Jing, Wenting Weng
Summary: In this study, CeO2 catalysts were synthesized using two renewable sources of activated carbon as carbon templates. The catalysts' structures were fully resolved through various analysis methods. Catalysts prepared with coconut shell activated carbon (CAC) template showed better surface morphology and improved catalytic performance compared to walnut shell activated carbon (WAC)-supported catalysts. The efficient synthesis of DMC was found to be correlated with the abundance of moderately acidic and moderately basic active sites on the catalyst.
JOURNAL OF THE ENERGY INSTITUTE
(2023)
Article
Chemistry, Multidisciplinary
Douglas Jose Faria, Leonardo Moreira dos Santos, Franciele Longaray Bernard, Ingrid Selbacch Pinto, Ivan Pacheco Romero, Vitaly V. Chaban, Sandra Einloft
Summary: The study investigated the catalytic activity of metal nitrate impregnated in activated carbon for DMC direct synthesis. Results showed that the AC-Fe catalyst is the most efficient with a yield of 30% at optimized conditions. The recycling of the catalytic system demonstrated that combining the right dehydrating agent (molecular sieve) with the catalyst (AC-Fe) can maintain high selectivity.
JOURNAL OF CO2 UTILIZATION
(2021)
Review
Biochemistry & Molecular Biology
Yifei Zhang, Muhammad Shoaib Khalid, Meng Wang, Gao Li
Summary: This review paper discusses the green production methods of DMC using Zr/Ce/Cu-based nanocomposites as catalysts, including the relationship between the structure and activity of catalysts, catalytic mechanisms, molecular activation and active sites identification of catalysts.
Article
Engineering, Environmental
Qingxin Zheng, Ryo Nishimura, Yoshiyuki Sato, Hiroshi Inomata, Masaki Ota, Masaru Watanabe, Severine Camy
Summary: This study evaluated the effects of different ZrO2 and M/ZrO2 catalysts on the synthesis of dimethyl carbonate from methanol and CO2, and found that the Ce0.1Zr0.9O2 catalyst had the highest yield. The research also showed that there was no significant correlation between catalytic activity and physical properties, but there was a certain relationship with reactivity.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Linmeng Huo, Tian Wang, Keng Xuan, Lei Li, Yanfeng Pu, Chenxin Li, Congzhen Qiao, Hao Yang, Yan Bai
Summary: The distance between Zr4+ and Zr4+/O2- sites in Zr-based catalysts has a significant impact on the adsorption and activation of CO2 and methanol. The Zr/SBA-15 catalyst with adjacent sites showed good catalytic activity, while no DMC was detected over the Zr-SBA-15 catalyst.
Article
Engineering, Environmental
Panpailin Seeharaj, Thanita Saenman, Thanabat Phiwhom, Chutanan Muangsuwan, Sira Srinives, Pattaraporn Kim-Lohsoontorn
Summary: In order to utilize the main greenhouse gas carbon dioxide (CO2), this study developed effective metal doped CeO2 nanospindle catalysts for the conversion of CO2 and methanol into dimethyl carbonate (DMC). Different transition metals were doped into CeO2 lattice, resulting in the formation of surface defect sites and oxygen vacancies. Among them, Ce0.9Fe0.1O2 showed the highest catalytic performance with 100% DMC selectivity. The improved catalytic activity was attributed to the higher proportion of surface defect sites and the change in acid-base properties caused by the integration of Fe dopants into CeO2 ionic system.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Mohamed A. Habila, Zied A. ALOthman, Monerah R. ALOthman, Mohammed Salah El-Din Hassouna
Summary: In this study, carbon from palm waste was modified with an ionic liquid and evaluated for the adsorption of benzothiophene. The modified carbon showed higher adsorption capacity compared to the raw carbon. The kinetics and isotherm models indicated that the second-order kinetic model and the Freundlich model were suitable for describing the adsorption process. The prepared adsorbents showed promising results for up to five cycles of regeneration and reuse.
Article
Chemistry, Applied
Evangeline Jafneel Nixon, Rajalakshmi Sakthivel, Zeid Abdullah ALOthman, Pattan-Siddappa Ganesh, Ren-Jei Chung
Summary: Contemporary food marketing focuses on flavor enhancers rather than the nutritional value of food. An electrochemical sensor was developed using a modified electrode made of La2NiO4 functionalized carbon nanofiber (f-CNF) for detecting vanillin in food samples. The sensor exhibited high sensitivity (0.2899 mu A center dot mu M-1 center dot cm(-2)) and low limit of detection (6 nM) through electrochemical analysis, making it a promising tool for vanillin detection in food.
Article
Engineering, Environmental
Ali H. Jawad, Ahmed Saud Abdulhameed, Siti Norasmah Surip, Zeid A. ALOthman
Summary: A new-designed adsorbent of CS-SA/ALG/MTN was prepared for the adsorption of anionic and cationic dyes from aquatic media. The Box-Behnken design was used to optimize the dosage, pH, and duration. The kinetic and equilibrium data showed the effectiveness of CS-SA/ALG/MTN as a multi-functional adsorbent for the remediation of industrial effluents.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Engineering, Environmental
Kamaliah Rosli, Ahmed Saud Abdulhameed, S. N. Surip, Zeid A. ALOthman, Ali H. Jawad
Summary: A green and effective adsorbent of chitosan/montmorillonite/algae (CHI/MMT/ALG) composite was developed to remove dyestuffs from aqueous solutions. The physicochemical characteristics of CHI/MMT/ALG were analyzed and the increased surface functionalities improved the adsorption of cationic and anionic dye molecules.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Geochemistry & Geophysics
Salis A. Musa, Ahmed Saud Abdulhameed, Siti Nor Atika Baharin, Zeid A. ALOthman, Lee D. Wilson, Ali H. Jawad
Summary: Activated carbon (MCAC) was successfully produced from Malaysian coal (MC) through microwave radiation assisted ZnCl2 activation. The MCAC exhibited a large surface area (798.18 m(2)/g) and a mesoporous structure (average pore diameter of 3.67 nm). The adsorption properties of MCAC were evaluated using Methylene Violet (MV 2B) as a model dye, and the results showed that the adsorption followed the Freundlich and pseudo-second order models. The study highlights the potential of MCAC as an effective adsorbent for pollutant removal.
Article
Chemistry, Multidisciplinary
Mohamed A. Habila, Mohamed S. Moshab, Ahmed Mohamed El-Toni, Zeid A. ALOthman, Ahmed Y. Badjah Hadj Ahmed
Summary: Thermal treatment was used to convert palm stalk waste into magnetic carbon sheets, which showed excellent dye removal performance. The samples prepared at 250 degrees C and 400 degrees C exhibited the best adsorption capacity, with equilibrium reached within 120 to 180 minutes. The second-order kinetic model and Freundlich model were suitable for describing the adsorption process.
Article
Biochemistry & Molecular Biology
Ruihong Wu, Ahmed Saud Abdulhameed, Soon Kong Yong, He Li, Zeid A. ALOthman, Lee D. Wilson, Ali H. Jawad
Summary: An effective hydrothermally prepared chitosan-benzaldehyde/SiO2 adsorbent (CTA-BZA/SiO2) was developed for the adsorption of acid red 88 (AR88) from wastewater. The adsorption variables were optimized using the Box-Behnken design. The Langmuir and Freundlich isotherms showed good agreement with empirical data, and the pseudo-firstorder model fit the kinetic data well. The CTA-BZA/SiO2 adsorbent demonstrated a high AR88 adsorption capacity and showed potential for removing a wide range of organic dyes from industrial effluents.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Biochemistry & Molecular Biology
Laili Azmiati Arni, Ahmad Hapiz, Ali H. Jawad, Ahmed Saud Abdulhameed, Zeid A. ALOthman, Lee D. Wilson
Summary: A novel nanohybrid composite of magnetic chitosan-salicylaldehyde/nanoclay (MCH-SAL/NCLA) was synthesized through hydrothermal method for the removal of acid red 88 (AR88) from simulated wastewater. Response surface methodology combined with the Box-Behnken design (RSM-BBD) was used to evaluate the impact of adsorption variables on AR88 dye adsorption. The MCH-SAL/NCLA composite exhibited a maximum adsorption capacity of 173.5 mg/g for AR88 dye. It was found that the adsorption of AR88 onto the MCH-SAL/NCLA surface was influenced by various processes including electrostatic, hydrogen bonding, n-& pi;, and n-& pi; interactions. This study demonstrated that MCH-SAL/NCLA can be an effective bio-adsorbent for the removal of azo dye from contaminated wastewater.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Environmental Sciences
Ali H. Jawad, Ahmed Saud Abdulhameed, Tumirah Khadiran, Zeid A. ALOthman, Lee D. Wilson, Sameer Algburi
Summary: This study focuses on the production of bamboo activated carbon (BBAC) through pyrolysis-induced K2CO3 activation and investigates its potential as an effective adsorbent for the removal of methylene blue (MB) dye. The results show that BBAC has a notable adsorption capacity and potential for treating wastewater contaminated with organic dyes.
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
(2023)
Article
Chemistry, Physical
Imran Ali, Yu Pakharukov, F. K. Shabiev, E. Galunin, R. F. Safargaliev, S. A. Vasiljev, B. S. Ezdin, A. E. Burakov, Zeid A. Alothman, Mika Sillanpaa
Summary: In this study, graphene-based nanofluids were synthesized and their viscosities were determined. The molecular interactions of graphene nanoparticles were theoretically analyzed to understand the mechanisms affecting the viscosity of nanofluids. An analytical function describing the dependence of the relative viscosity on the concentration of graphene nanoparticles was obtained based on experimental results. It was found that the viscosity of the nanofluid was influenced by the structure of the graphene sheets, and the self-assembly of the nanoparticles played a crucial role in the viscosity changes.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Analytical
Khadidja Addadi, Khaled Sekkoum, Nasser Belboukhari, Zeid A. ALOthman, Ahmed M. Aljuwayid, Mika Sillanpaa, Imran Ali
Summary: In this study, the enantio-separation of three chiral sulfoxide drugs was achieved on a Chiralpak AS-3R column using acetonitrile-water as the mobile phase. The chiral separation was validated properly with LOD and LOQ values of 9.70-14.16 and 29.39-42.91 μg/mL, respectively. The enantiomer elution order was confirmed through experimental and theoretical methods. A simple, fast, reliable, and thermodynamically stable HPLC method was developed for the separation and determination of enantiomer elution order of the chiral sulfoxide drugs.
MICROCHEMICAL JOURNAL
(2023)
Article
Polymer Science
Ruihong Wu, Ahmed Saud Abdulhameed, Soon Kong Yong, Zeid A. Alothman, Lee D. Wilson, Ali H. Jawad
Summary: The current study used the hydrothermal approach to prepare a nanohybrid composite of salicylaldehyde-based chitosan Schiff base/SiO2 (CTS-SA/SiO2), which exhibited high adsorption capacity for acid red 88 (AR88) dye. The study systematically investigated the effects of CTS-SA/SiO2 dose, pH, and time on the adsorption performance of AR88. The results showed that CTS-SA/SiO2 can be a promising adsorbent for organic dye removal from water systems.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2023)
Article
Entomology
Hend M. Alharbi, Yasser A. Elnakady, Badr A. Aldahmash, Reem Alajmi, Zeid A. ALOthman, Ahmed-Yacine Badjah-Hadj-Ahmed, Ahmad Aqel, Ashraf M. Ahmed
Summary: This study investigated the digestion process of blood meals in Culex pipiens mosquitoes, both with and without heroin. The researchers proposed a method for estimating the post-feeding interval (PFI) based on the rate of hemoglobin digestion. The results showed that heroin impacted the digestion process, requiring additional time to complete. These findings have important implications for forensic science.
JOURNAL OF MEDICAL ENTOMOLOGY
(2023)
Article
Biochemical Research Methods
Maha Hasni, Nasser Belboukhari, Khaled Sekkoum, Raluca-Ioana Stefan-van Staden, Zeid A. Alothman, Ersin Demir, Imran Ali
Summary: The essential oil of Heliotropium bacciferum plant has significant medicinal value, and this study extracted and analyzed its essential oil, as well as evaluated its anti-inflammatory and anti-bacterial activities. The results showed that the essential oil displayed effective anti-inflammatory and anti-bacterial properties, indicating its potential as a therapeutic agent.
ANALYTICAL BIOCHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Ruihong Wu, Ahmed Saud Abdulhameed, Ali H. Jawad, Soon Kong Yong, He Li, Zeid A. Alothman, Lee D. Wilson, Sameer Algburi
Summary: A polymer nanomatrix of chitosan/SiO2 enriched with a pi-pi electron donor-acceptor system using benzil was synthesized via a hydrothermal process. The resulting adsorbent, CHI-BEZ/n-SiO2, showed higher adsorption capacity than CHI/n-SiO2 for removing the anionic acid red 88 dye from water. This suggests that CHI-BEZ/n-SiO2 is a highly efficient adsorbent.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
