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  1. Article ; Online: Synthesis of Novel Zn 3 V 2 O 8 /Ag Nanocomposite for Efficient Photocatalytic Hydrogen Production

    Fahad A. Alharthi / Alanood Sulaiman Ababtain / Hend Khalid Aldubeikl / Hamdah S. Alanazi / Imran Hasan

    Catalysts, Vol 13, Iss 455, p

    2023  Volume 455

    Abstract: In this study, we fabricated Zn 3 V 2 O 8 and a Ag-modified Zn 3 V 2 O 8 composite (Zn 3 V 2 O 8 /Ag) by utilizing effective and benign approaches. Further characterization techniques such as powder X-ray diffraction (XRD) and scanning electron ... ...

    Abstract In this study, we fabricated Zn 3 V 2 O 8 and a Ag-modified Zn 3 V 2 O 8 composite (Zn 3 V 2 O 8 /Ag) by utilizing effective and benign approaches. Further characterization techniques such as powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) were explored to examine the phase and structural properties, respectively, of the synthesized Zn 3 V 2 O 8 /Ag and Zn 3 V 2 O 8 /Ag composite materials. The oxidation states and elemental composition of the synthesized Zn 3 V 2 O 8 /Ag and Zn 3 V 2 O 8 /Ag were characterized by adopting X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDX). The optical band gaps of the synthesized Zn 3 V 2 O 8 /Ag and Zn 3 V 2 O 8 /Ag were examined by employing ultraviolet–visible (UV-vis) diffuse reflection spectroscopy. HRTEM images clearly show that ZnV@Ag NC has a hexagonal plate-like morphology. Subsequently, Zn 3 V 2 O 8 and Zn 3 V 2 O 8 /Ag were used as photocatalysts for photocatalytic hydrogen (H 2 ) production. It was observed that after Ag doping, the energy band gap of ZnV was reduced from 2.33 eV to 2.19 eV. EDX mapping images also show the presence of Ag, O, Zn, and V elements and confirm the formation of ZnV@Ag NC with good phase purity. Observations clearly showed the presence of excellent photocatalytic properties of the synthesized photocatalyst. The Zn 3 V 2 O 8 /Ag photocatalyst exhibited H 2 generation of 37.52 µmolg −1 h −1 , which is higher compared to pristine Zn 3 V 2 O 8 . The Zn 3 V 2 O 8 /Ag photocatalyst also demonstrated excellent reusability, including decent stability. The reusability experiments suggested that ZnV@Ag NC has excellent cyclic stability for up to six cycles.
    Keywords Zn 3 V 2 O 8 /Ag nanocomposite ; photocatalytic H 2 production ; water splitting ; surface plasmon resonance ; sacrificial reagents ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
    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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  2. Article ; Online: Zinc Vanadate (Zn 3 V 2 O 8 ) Immobilized Multiwall Carbon Nanotube (MWCNT) Heterojunction as an Efficient Photocatalyst for Visible Light Driven Hydrogen Production

    Fahad A. Alharthi / Alanood Sulaiman Ababtain / Hamdah S. Alanazi / Alanoud Abdullah Alshayiqi / Imran Hasan

    Molecules, Vol 28, Iss 1362, p

    2023  Volume 1362

    Abstract: Z-scheme photocatalytic reaction is considered an effective strategy to promote the photogenerated electron-hole separation for significantly improving the efficiency of photocatalytic hydrogen precipitation from splitting water. In this study, a ... ...

    Abstract Z-scheme photocatalytic reaction is considered an effective strategy to promote the photogenerated electron-hole separation for significantly improving the efficiency of photocatalytic hydrogen precipitation from splitting water. In this study, a heterojunction nanocomposite material based on Zn 3 V 2 O 8 (ZV) with MWCNT was prepared by a hydrothermal process. The photocatalysts were characterized by X-ray diffraction, scanning electron microscopy (SEM), Fourier transform infrared (FTIR), UV-visible absorption spectroscopy, and transmission electron microscopy (TEM) to understand crystal structure, morphology, and optical properties. The efficiency of the samples was evaluated for the photocatalytic H 2 production under visible solar radiation using water glycerol as a sacrificial reagent. The obtained results suggest that, between ZV and ZV@MWCNT, the latter shows higher efficiency for H 2 production. The maximum H 2 production efficiency was found to be 26.87 μmol g −1 h −1 for ZV and 99.55 μmol g −1 h −1 for ZV@MWCNT. The synergistic effect of MWCNT to ZV resulted in improving the efficiency of charges and light-absorbing capacity, resulting in enhanced H 2 production in the heterojunction nanocomposite material. The nanocomposite was stable and highly efficient for H 2 production of six or more cycles. Based on the outcomes of this study, it can be observed that forming the heterojunction of individual nano systems could result in more efficient material for H 2 production under visible solar energy.
    Keywords MWCNT ; Nanocomposites ; H 2 evolution ; heterojunction ; photocatalytic process ; Organic chemistry ; QD241-441
    Subject code 290
    Language English
    Publishing date 2023-01-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Synthesis of Zn 3 V 2 O 8 /rGO Nanocomposite for Photocatalytic Hydrogen Production

    Fahad A. Alharthi / Alanood Sulaiman Ababtain / Hamdah S. Alanazi / Wedyan Saud Al-Nafaei / Imran Hasan

    Inorganics, Vol 11, Iss 93, p

    2023  Volume 93

    Abstract: In this study, zinc vanadate/reduced graphene oxide (Zn 3 V 2 O 8 /rGO) composite has been synthesized via a simple approach. Advanced characterization techniques (powder X-ray, scanning electron microscopy, energy dispersive X-ray spectroscopy and ... ...

    Abstract In this study, zinc vanadate/reduced graphene oxide (Zn 3 V 2 O 8 /rGO) composite has been synthesized via a simple approach. Advanced characterization techniques (powder X-ray, scanning electron microscopy, energy dispersive X-ray spectroscopy and ultraviolet-visible (UV-vis) spectroscopy) have been used to authenticate the formation of Zn 3 V 2 O 8 /rGO composite. Subsequently, Zn 3 V 2 O 8 /rGO was applied as photo-catalyst for hydrogen generation using photo-catalysis. The Zn 3 V 2 O 8 /rGO photo-catalyst exhibited a good hydrogen generation amount of 104.6 µmolg −1 . The Zn 3 V 2 O 8 /rGO composite also demonstrates excellent cyclic stability which indicated better reusability of the photo-catalyst (Zn 3 V 2 O 8 /rGO). This work proposes a new photo-catalyst for H 2 production application. We believe that the presence of synergistic interactions was responsible for the improved photo-catalytic properties of Zn 3 V 2 O 8 /rGO composite. The Zn 3 V 2 O 8 /rGO composite is an environmentally friendly and cost-effective photo-catalyst and can be used for photo-catalytic applications.
    Keywords zinc vanadate ; hydrogen production ; Zn 3 V 2 O 8 /rGO ; photo-catalyst ; Inorganic chemistry ; QD146-197
    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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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  4. Article ; Online: Photocatalytic Degradation of the Light Sensitive Organic Dyes

    Fahad A. Alharthi / Abdulaziz Ali Alghamdi / Hamdah S. Alanazi / Amjad Abdullah Alsyahi / Naushad Ahmad

    Catalysts, Vol 10, Iss 1457, p

    Methylene Blue and Rose Bengal by Using Urea Derived g-C 3 N 4 /ZnO Nanocomposites

    2020  Volume 1457

    Abstract: In this study, we report the fabrication of graphitic carbon nitride doped zinc oxide nanocomposites, g-C 3 N 4 /ZnO, (Zn-Us) by using different amount of urea. They were further characterized by X-ray Diffraction (XRD), Fourier-transform infrared ... ...

    Abstract In this study, we report the fabrication of graphitic carbon nitride doped zinc oxide nanocomposites, g-C 3 N 4 /ZnO, (Zn-Us) by using different amount of urea. They were further characterized by X-ray Diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), Raman, UV-vis, Scanning electron microscopy (SEM), and Transmission electron microscopy (TEM) techniques. The prepared nanocomposites were used as photocatalysts for the mineralization of the light sensitive dyes Methylene Blue (MB) and Rose Bengal (RB) under UV light irradiation, and corresponding photo-mechanism was proposed. Benefiting from these photocatalytic characteristics, urea derived g-C 3 N 4 /ZnO photocatalysts have been found to have excellent photodegradation activity against the MB and RB for 6 h and 4 h, respectively. Under the given experimental conditions, the degradation percentage of fabricated Zn-Us were shown ~90% for both model dyes. Compared to cationic MB dye, anionic RB dye is more actively degraded on the surface of prepared photocatalysts. The results obtained can be effectively used for future practical applications in wastewater treatment
    Keywords Rose Bengal ; g-(C3N4) ; ZnO ; Methylene Blue ; UV-light ; photocatalytic degradation ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
    Subject code 669
    Language English
    Publishing date 2020-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Effective adsorption of crystal violet from aqueous solutions with effective adsorbent

    Hamza S. AL-Shehri / Eyad Almudaifer / Ali Q. Alorabi / Hamdah S. Alanazi / Ali S. Alkorbi / Fahad A. Alharthi

    Environmental Pollutants & Bioavailability, Vol 33, Iss 1, Pp 214-

    equilibrium, mechanism studies and modeling analysis

    2021  Volume 226

    Abstract: In this work, NaOH-activated Aerva javanica leaf (NAJL) powder was successfully developed as a cost-effective adsorbent for removal of crystal violet (CV) from an aqueous environment. The prepared adsorbent was characterized using FTIR, SEM, and their ... ...

    Abstract In this work, NaOH-activated Aerva javanica leaf (NAJL) powder was successfully developed as a cost-effective adsorbent for removal of crystal violet (CV) from an aqueous environment. The prepared adsorbent was characterized using FTIR, SEM, and their surface area was determined by BET technique. Different parameters affecting the adsorption of CV dye such as pH solution, adsorbent dose, equilibrium time, initial CV concentration, and temperature were investigated. The results revealed that the best-optimized values were found as pH–9, dose–20 mg, time–30 min, temperature– 25 °C. The adsorption experimental data exhibited excellently fitted well to the nonlinear Langmuir isotherm and Pseudo-first-order kinetic models. The maximum monolayer adsorption capacity of CV dye was 315.2 mg/g. The experimental parameters of thermodynamic analysis exhibited that the CV dye adsorption onto NAJL powder was exothermic and spontaneous. Electrostatic attraction, π-π interactions, and Hydrogen bonding were the mechanism behind the adsorption of CV dye.
    Keywords aerva javanic ; exothermic ; toxic crystal violet ; adsorption ; isotherm ; Environmental pollution ; TD172-193.5 ; Environmental sciences ; GE1-350
    Subject code 541
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher Taylor & Francis Group
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Adsorption of Methylene Blue by Biosorption on Alkali-Treated Solanum incanum

    Hamza S. AL-Shehri / Hamdah S. Alanazi / Areej Mohammed Shaykhayn / Lina Saad ALharbi / Wedyan Saud Alnafaei / Ali Q. Alorabi / Ali S. Alkorbi / Fahad A. Alharthi

    Sustainability, Vol 14, Iss 2644, p

    Isotherms, Equilibrium and Mechanism

    2022  Volume 2644

    Abstract: In this study, a new bio-adsorbent (NASIF) was successfully prepared via chemical activation of Solanum incanum (SI) with hydrogen peroxide and sodium hydroxide reagents as an inexpensive and effective adsorbent for the removal of methylene blue (MB) ... ...

    Abstract In this study, a new bio-adsorbent (NASIF) was successfully prepared via chemical activation of Solanum incanum (SI) with hydrogen peroxide and sodium hydroxide reagents as an inexpensive and effective adsorbent for the removal of methylene blue (MB) from aqueous media. The morphology of the NASIF adsorbent surface and the nature of the potential MB interactions were examined by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) micrograph. FTIR results suggested that carboxyl, carbonyl, and hydroxyl groups were involved in MB adsorption on the NASIF surface. EDX analysis confirmed the successful increase of oxygen-containing functional groups during the chemical activation. The influence of important factors was studied using the batch method. The results revealed that the maximum removal efficiency was 98% at contact time: 120 min; pH: 6.5, adsorbent dose: 40 mg; and temperature-25 °C. Isothermal behavior was evaluated using three non-linear isotherm models, Langmuir, Freundlich, and D–R isotherm. MB adsorption onto NASIF adsorbent followed the Langmuir isotherm model with maximum monolayer capacity (mg/g) at 25 °C. Meanwhile, the PSO kinetics model was found to be better than PFO kinetic model for describing the adsorption process using kinetic models. Based on the D–R model, the free energy (E, kJ mol −1 ) values were in the range of 0.090–0.1812 kJ mol −1 , which indicated that the MB adsorption onto NASIF may belong to physical adsorption. The adsorption mechanism of MB onto NASIF adsorbent mainly includes electrostatic attraction, π-π interaction, n-π interaction, and H-bonding. The thermodynamic parameters revealed that the adsorption process was a feasibility, spontaneous and exothermic process. Finally, the result of the present work could provide strong evidence of the potential of NASIF adsorbent for eliminating MB from aqueous media.
    Keywords Solanum incanum ; isotherm ; adsorption ; mechanism ; methylene blue ; exothermic ; Environmental effects of industries and plants ; TD194-195 ; Renewable energy sources ; TJ807-830 ; Environmental sciences ; GE1-350
    Subject code 541
    Language English
    Publishing date 2022-02-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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