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Catalysts
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Advanced Nanostructured Materials for Modern Catalysis Applications
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Advanced Nanostructured Materials for Modern Catalysis Applications

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Nanostructured Catalysts".

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 11325

Special Issue Editors

Dr. Mohd Shkir

E-Mail Website
Guest Editor
Department of Physics, Faculty of Science, King Khalid University, Riyadh, Saudi Arabia
Interests: nanoscale materials; advanced functional materials; nanomaterials/nanocomposites; optical properties; nonlinear optics; electrical properties; photodetectors; gas sensors/biosensors; solar cells; supercapacitors/batteries; carbon-related materials; graphene-related materials and their composites; thin-film technology
Special Issues, Collections and Topics in MDPI journals
Dr. Mohd Ubaidullah

E-Mail Website
Guest Editor
Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
Interests: nanoscience; nanochemistry; energy; catalysis; water treatment; sensors; PV cells; nonlinear optics; synthesis and characterization of metal oxides/sulfides/carbides/phosphides etc.; metal organic frameworks; surface alterations/modifications; flexible polymers; functionalization
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent past the advanced nanostructured materials are in the spotlight for their development. A tremendous effort has been done by the researchers and scientists for the development of mono and multiphase solids with fascinating characteristics for advanced catalysis applications. It is a known fact that on applying the nanostructured novel materials as homo/heterogeneous catalysts, they show superior characteristics compare to normal powders used as catalysts. The nanostructured materials possess several improvements like their size/morphology/shape/active sites and the new effects at nanoscale initiating from synergies. Hence, the nanostructure novel materials becoming the hotspot in the field of materials science and technology and very talented in modern manufacturing of chemicals with special properties for catalysis applications. So, the key aim of the current special issue titled “Advanced Nanostructured Materials For Modern Catalysis Applications” is to widely cover the advanced research on novel catalysts from nanostructured materials. This special issue also covers the development of new methods/techniques for producing the novel nanostructured materials used for diverse applications. The nanostructured materials which may be employed in several applications such as photocatalysts, electrocatalysts, biocatalysts, conventional catalysts, environmental remedy, water treatments, renewable energies etc. Potential topics include, but are not limited to: Nanostructured materials development for catalysis applications Nanocomposites Photocatalysis mechanisms Nanostructured materials future perspectives Novel techniques/methods to develop nanostructured materials Nanostructured materials as photocatalysts/electrocatalysts/biocatalysts/conventional catalysts Nanostructured materials in environmental remedy, water treatments, renewable energies etc Role of nanostructured materials in biomedical/renewable energy/nanomedicine

Dr. Mohd Shkir
Dr. Mohd Ubaidullah
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • nanostructured materials
  • organic/inorganic catalysts
  • nanocomposites
  • mechanism
  • photocatalysts/electrocatalysts/biocatalysts/conventional catalysts
  • environmental remedy
  • water treatments
  • renewable energies

Published Papers (7 papers)

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Research

26 pages, 6673 KiB  
Article
Synthesis of a Novel Photocatalyst Based on Silicotitanate Nanoparticles for the Removal of Some Organic Matter from Polluted Water
by Amr A. Sayed Alahl, Hesham A. Ezzeldin, Abdullah A. Al-Kahtani, Sadanand Pandey and Yousra H. Kotp
Catalysts 2023, 13(6), 981; https://doi.org/10.3390/catal13060981 - 08 Jun 2023
Cited by 12 | Viewed by 1240
Abstract
The use of waste from various agricultural sectors has recently drawn increased interest from the scientific, technological, ecological, economic, and social fields. As such, in this study, a novel production of an affordable and environmentally friendly photocatalyst of silicotitanate (S1, S2, and S3) [...] Read more.
The use of waste from various agricultural sectors has recently drawn increased interest from the scientific, technological, ecological, economic, and social fields. As such, in this study, a novel production of an affordable and environmentally friendly photocatalyst of silicotitanate (S1, S2, and S3) made from silica solution (extracted from rice husk ash) and various molar ratios of titanium (IV) 2-ethylhexyl-oxide is reported. Following that, chitosan/silicotitanate (CHMix) nanocomposite material was created through a crosslinking reaction between chitosan and fabricated silicotitanate (S2). Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM-EDX), as well as N2 adsorption-desorption isotherm and zeta potential measurements were used to characterize each of the fabricated samples. Additionally, in comparison to neat chitosan, the newly fabricated material’s (CHMix) photocatalytic reactivity was investigated using two synthetic anionic dyes, reactive blue and Congo red, with decolorization rates of up to 95.76% and 99.9%, respectively. The decolorization results showed that CHMix is the most efficient photocatalyst for the degradation of reactive blue and Congo red. Reactive blue and Congo red’s molecular structures were almost completely broken when equilibrium was reached using sunlight, and the decolorization rate for both dyes was close to 100%. As a result, the combination of chitosan and silicotitanate, or CHMix, has an effective photocatalytic capability for dye degradation in both natural and concentrated sunlight. Full article
(This article belongs to the Special Issue Advanced Nanostructured Materials for Modern Catalysis Applications)
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17 pages, 6503 KiB  
Article
Hydrothermally Derived Mg-Doped TiO2 Nanostructures for Enhanced H2 Evolution Using Photo- and Electro-Catalytic Water Splitting
by Mohd Fazil, Saad M. Alshehri, Yuanbing Mao and Tokeer Ahmad
Catalysts 2023, 13(5), 893; https://doi.org/10.3390/catal13050893 - 15 May 2023
Cited by 7 | Viewed by 2494
Abstract
Mg-doped TiO2 nano-structures in different compositions (1, 2.5 and 5%) were successfully synthesized by low-temperature hydrothermal route. X-ray diffraction and electron microscopic studies were used to investigate the crystal structure, surface morphology and particle size of the as-synthesized materials. Raman studies were [...] Read more.
Mg-doped TiO2 nano-structures in different compositions (1, 2.5 and 5%) were successfully synthesized by low-temperature hydrothermal route. X-ray diffraction and electron microscopic studies were used to investigate the crystal structure, surface morphology and particle size of the as-synthesized materials. Raman studies were carried out to elucidate the phase identification and the modes of vibrations to determine the impact of dopant ion on the crystal structures. The band gap was estimated using UV-DRS studies whereas, BET surface area analysis revealed an increase in the surface area of increasing Mg2+ ions concentration in TiO2 nanostructures. Among the synthesized various composition of nano-structures, 5% Mg-doped TiO2 photocatalyst showed maximum hydrogen evolution activity (38.96 mmol gcat−1) in an 8-h analysis cycle. Moreover, the 2.5% Mg-doped TiO2 nanocatalyst with tafel slopes of 123.5 and 126.7 mV/dec showed strong activity for both HER in 0.5 N H2SO4 and 0.1 N KOH, with an onset potential of 0.96 V (at 10 mA/cm2) and −1.38 V (at 1 mA/cm2) for HER, respectively. Experimental investigations deduced that the incorporation of Mg2+ ions in the TiO2 resulted in the increase of hydrogen generation catalytic activity of titanium dioxide owing to the synergistic effect provided by the remarkable surface area and the presence of defects introduced by doping. Full article
(This article belongs to the Special Issue Advanced Nanostructured Materials for Modern Catalysis Applications)
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11 pages, 2793 KiB  
Article
Hydrogen Evolution Reaction Activities of Room-Temperature Self-Grown Glycerol-Assisted Nickel Chloride Nanostructures
by Nanasaheb M. Shinde, Siddheshwar D. Raut, Balaji G. Ghule, Ramesh J. Deokate, Sandesh H. Narwade, Rajaram S. Mane, Qixun Xia, James J. Pak and Jeom-Soo Kim
Catalysts 2023, 13(1), 177; https://doi.org/10.3390/catal13010177 - 12 Jan 2023
Cited by 3 | Viewed by 1987
Abstract
Three-dimensional nanomaterials of desired structural/morphological properties and highly porous with a high specific surface area are important in a variety of applications. In this work, glycerol-mediated self-growth of 3-D dandelion flower-like nickel chloride (NiCl2) from nickel-foam (NiF) is obtained for the [...] Read more.
Three-dimensional nanomaterials of desired structural/morphological properties and highly porous with a high specific surface area are important in a variety of applications. In this work, glycerol-mediated self-growth of 3-D dandelion flower-like nickel chloride (NiCl2) from nickel-foam (NiF) is obtained for the first time using a room-temperature (27 °C) processed wet chemical method for electrocatalysis application. Glycerol-mediated self-grown NiCl2 flowers demonstrate an excellent electrocatalytic performance towards the hydrogen evolution reaction (HER), which is much superior to the NiF (303 mV) and NiCl2 electrode prepared without glycerol (208 mV) in the same electrolyte solution. With a Tafel slope of 41 mV dec−1, the NiCl2 flower electrode confirms improved reaction kinetics as compared to the other two electrodes, i.e., NiF (106 mVdec−1) and NiCl2 obtained without glycerol (56 mV dec−1). The stability of the glycerol-based NiCl2 electrode has further been carried out for 2000 cycles with the overpotential diminution of just 8 mV, approving an electrocatalyst potential of glycerol-based NiCl2 electrode towards HER kinetics. This simple and easy growth process involves nucleation, aggregation, and crystal growth steps for producing NiCl2 nanostructures for electrocatalytic water splitting application through the HER process. Full article
(This article belongs to the Special Issue Advanced Nanostructured Materials for Modern Catalysis Applications)
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14 pages, 3646 KiB  
Article
Augmenting the Photocatalytic Performance of Direct Z-Scheme Bi2O3/g-C3N4 Nanocomposite
by Krishnasamy Mahalakshmi, Rajendran Ranjith, Pazhanivel Thangavelu, Matheshwaran Priyadharshini, Baskaran Palanivel, Mohamed Aslam Manthrammel, Mohd Shkir and Barathi Diravidamani
Catalysts 2022, 12(12), 1544; https://doi.org/10.3390/catal12121544 - 01 Dec 2022
Cited by 4 | Viewed by 1389
Abstract
Huge demands for photocatalytically efficient visible-light-induced catalysts have spurred widespread interest in building adaptable heterojunctions. Here, we used in situ thermal polymerization to synthesise the Z-scheme Bi2O3/g-C3N4 heterojunction. The optical, structural, chemical, compositional and photocatalytic behaviours [...] Read more.
Huge demands for photocatalytically efficient visible-light-induced catalysts have spurred widespread interest in building adaptable heterojunctions. Here, we used in situ thermal polymerization to synthesise the Z-scheme Bi2O3/g-C3N4 heterojunction. The optical, structural, chemical, compositional and photocatalytic behaviours of the samples were analysed through various analytical techniques and photocatalytic methylene blue (MB) dye degradation reaction. Among the various ratios of Bi2O3/g-C3N4 heterojunction composites, the 1:1 ratio showed improved visible-light-induced catalytic activity, which attained 91.2% degradation efficiency after 120 min of visible-light exposure. The dye degradation efficiency was calculated under various environmental conditions by varying the dye concentration, solution pH and catalyst dosage. A improved Z-scheme photocatalytic mechanism was proposed in light of the results. A potential mechanism was suggested to explain the photocatalytic activity, and trapping experiments supported it. Last but not least, this strategy might be helpful to prepare the heterojunction photocatalyst for the degradation of organic pigments. Full article
(This article belongs to the Special Issue Advanced Nanostructured Materials for Modern Catalysis Applications)
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11 pages, 3150 KiB  
Article
Effects of Preparation Methods of Pd Supported on (001) Crystal Facets Exposed TiO2 Nanosheets for Toluene Catalytic Combustion
by Guiyun Yu, Chengyan Ge and Haiqin Wan
Catalysts 2022, 12(11), 1406; https://doi.org/10.3390/catal12111406 - 10 Nov 2022
Viewed by 1053
Abstract
A series of TiO2 nanosheets-supported Pd catalysts were individually prepared by impregnation, deposition–precipitation, photo-deposition and in situ reduction by NaBH4. For comparison, Pd supported on P25 was prepared by the impregnation method. The experimental results show that the catalytic efficiency [...] Read more.
A series of TiO2 nanosheets-supported Pd catalysts were individually prepared by impregnation, deposition–precipitation, photo-deposition and in situ reduction by NaBH4. For comparison, Pd supported on P25 was prepared by the impregnation method. The experimental results show that the catalytic efficiency of the catalyst prepared with titanium dioxide nano sheet as the support is higher than that of the catalyst supported with P25. Its excellent properties are as follows: The resulting sample indicates that TiO2 nanosheets-supported Pd catalyst display an improved activity than Pd/P25, whose temperature of 100% complete conversion of toluene decreased by 40 ℃ at the most. The Pd particles on the catalyst synthesized by the light deposition method and the NaBH4 reduction method are more obvious, while the Pd particles on the catalyst synthesized by the immersion method and the deposition–precipitation method are less obvious, which shows that the latter two methods are more conducive to the dispersion of Pd. The good catalytic activity may be due to the better exposed mirror and dispersion of titanium dioxide nanosheets. This is mainly related to the exposed crystal plane of the nanosheet TiO2 (001), which made it easier to form the oxygen vacancy. Moreover, among all of the TiO2 nanosheets-supported Pd catalysts, Pd/TiO2 NS (TiO2 NS means TiO2 nanosheets) prepared by the impregnation method show the highest catalytic activity. The XRD results show that Pd prepared by impregnation is more dispersed and smaller. This is due to PdO being dispersed more efficiently than the others, leading to more Pd active sites. Full article
(This article belongs to the Special Issue Advanced Nanostructured Materials for Modern Catalysis Applications)
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16 pages, 6203 KiB  
Article
Effect of Different Zeolite Supports on the Catalytic Behavior of Platinum Nanoparticles in Cyclohexene Hydrogenation Reaction
by Mohamed S. Hamdy, Fatimah A. Alqahtani, Mohd Shkir, Khaled F. Fawy, Mhamed Benaissa, Mohamed Bechir Ben Hamida and Noureddine Elboughdiri
Catalysts 2022, 12(10), 1106; https://doi.org/10.3390/catal12101106 - 25 Sep 2022
Cited by 4 | Viewed by 1316
Abstract
In this study, 1 wt% platinum (Pt) nanoparticles were incorporated into five types of zeolites (HY, Beta, mordenite, ZSM-5, and ferrierite) with an impregnation technique. The synthesis strategy included the use of water as a solvent for the applied Pt source. Moreover, the [...] Read more.
In this study, 1 wt% platinum (Pt) nanoparticles were incorporated into five types of zeolites (HY, Beta, mordenite, ZSM-5, and ferrierite) with an impregnation technique. The synthesis strategy included the use of water as a solvent for the applied Pt source. Moreover, the incorporation process was performed at ambient conditions followed by calcination at 450 °C. The five prepared materials were characterized by different physical and chemical characterization techniques and the obtained results confirmed the formation of Pt nanoparticles with an average size of 5–10 nm. The catalytic performance of the prepared materials was evaluated in the hydrogenation of cyclohexene under a solvent-free system at room temperature. Pt nanoparticles supported on ZSM-5 zeolite exhibited the best catalytic performance. Moreover, the optimization of operational conditions such as temperature, pressure, and catalyst amount was investigated and the obtained results showed the possibility to convert 100% of cyclohexene within 35 min over Pt-ZSM-5. Finally, the reusability of the Pt-ZSM-5 catalyst was investigated in four consecutive runs without treatment and the obtained results showed a negligible activity loss. Full article
(This article belongs to the Special Issue Advanced Nanostructured Materials for Modern Catalysis Applications)
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12 pages, 2146 KiB  
Article
Facile and Novel Route for the Preparation of ZnO Nanoparticles with Different Cr Loadings for Opto-Photocatalysis Applications
by Tahani M. Bawazeer
Catalysts 2022, 12(10), 1093; https://doi.org/10.3390/catal12101093 - 21 Sep 2022
Cited by 6 | Viewed by 1271
Abstract
The current article deals with the facile yet novel route to prepare zinc oxide (ZnO) nanoparticles with different weight percentages of chromium as a dopant. The impact of such dopant into the ZnO host lattice is explored in terms of the structural, vibrational, [...] Read more.
The current article deals with the facile yet novel route to prepare zinc oxide (ZnO) nanoparticles with different weight percentages of chromium as a dopant. The impact of such dopant into the ZnO host lattice is explored in terms of the structural, vibrational, optical, and photocatalytic characteristics. The Bragg reflections in the X-ray diffraction displayed a phase pure wurtzite ZnO hexagonal system. The morphology reflects spherical-shaped ZnO particles in all the systems. The optical analysis ensured a good ultraviolet light absorption and a bandgap energy in the range of 3.30–3.24 eV. The principal Raman vibrations ensured the presence of the wurtzite ZnO crystal structure. The decolorization experiment of methyl green dye with pristine and various chromium-doped ZnO nanoparticles was conducted under the illumination of visible light. The obtained results showed that the incorporation of Cr in the framework significantly improved the photocatalytic performance of ZnO. Full article
(This article belongs to the Special Issue Advanced Nanostructured Materials for Modern Catalysis Applications)
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