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  1. AU="Tantawy, Hesham"
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  1. Article ; Online: Reduced Graphene Oxide/Barium Ferrite Ceramic Nanocomposite Synergism for High EMI Wave Absorption.

    Sadek, Ramy / Sharawi, Mohammad S / Dubois, Charles / Tantawy, Hesham / Chaouki, Jamal

    ACS omega

    2023  Volume 8, Issue 17, Page(s) 15099–15113

    Abstract: The developed nanocomposite exhibits significantly enhanced shielding performance due to the synergistic effect of high dielectric and magnetic loss materials, which modifies the material's impedance and improves its absorption ability. Different weight ... ...

    Abstract The developed nanocomposite exhibits significantly enhanced shielding performance due to the synergistic effect of high dielectric and magnetic loss materials, which modifies the material's impedance and improves its absorption ability. Different weight percentages (0, 1, 5, 10, 15, 20, and 25 wt %) of thermally treated chemically reduced graphene oxide (TCRGO) were combined with two types of magnets, barium hexaferrite (BF) and magnetite (MAG), using a dry powder compaction technique to produce binary ceramic nanocomposite sheets. The shielding performance of a 1 mm thick compressed nanoceramic sheet over the X-band was evaluated using a vector network analyzer. The 25% TCRGO showed high shielding performance for both BF and MAG, while BF had a total shielding efficiency (SET) that exceeded MAG by 130%. The SET of 25 wt % TCRGO/BF was 52 dB, with a 41 dB absorption shielding efficiency (SEA). Additionally, the effect of different levels of incident electromagnetic wave power (0.001-1000 mW) at various thicknesses (1, 2, and 5 mm) was explored. At 1000 mW, the 5 mm TCRGO/BF had an SET of 99 dB, an SEA of 91 dB, and a reflection shielding efficiency (SER) of 8 dB. The use of BF as a hard magnet paired with TCRGO exhibited excellent and stable electromagnetic shielding performance.
    Language English
    Publishing date 2023-04-20
    Publishing country United States
    Document type Journal Article
    ISSN 2470-1343
    ISSN (online) 2470-1343
    DOI 10.1021/acsomega.2c08168
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Designing bimetallic zeolitic imidazolate frameworks (ZIFs) for aqueous catalysis: Co/Zn-ZIF-8 as a cyclic-durable catalyst for hydrogen peroxide oxidative decomposition of organic dyes in water

    Abuzalat, Osama / Tantawy, Hesham / Basuni, Mustafa / Alkordi, Mohamed H. / Baraka, Ahmad

    RSC advances. 2022 Feb. 18, v. 12, no. 10

    2022  

    Abstract: ZIF-8 is well known hybrid material that is self-assembled from inorganic and organic moieties. It has several potential applications due to its unique structure. One of these potential applications is in advanced oxidation processes (AOP) via a ... ...

    Abstract ZIF-8 is well known hybrid material that is self-assembled from inorganic and organic moieties. It has several potential applications due to its unique structure. One of these potential applications is in advanced oxidation processes (AOP) via a heterogeneous catalysis system. The use of modified ZIF-8/H₂O₂ for the destruction of the azo dye methyl orange (MO) is presented in this work to explore its efficacy. This work presents the bimetallic Co/Zn-ZIF-8 as an efficient catalyst to promote H₂O₂ oxidation of the MO dye. Co/Zn-ZIF-8 was synthesized through a hydrothermal process, and the pristine structure was confirmed using XRD, FTIR, and XPS. The Co/Zn-ZIF-8/H₂O₂ system successfully decolorized MO at the selected pH 6.5. It was found that more than 90% of MO (10 ppm) was degraded within only about 50 minutes. Proposed radical and redox mechanisms are presented for H₂O₂ decomposition where the redox mechanism is suggested to predominate via a Co(ii)/Co(iii) redox consecutive cyclic process.
    Keywords azo dyes ; catalysts ; catalytic activity ; decolorization ; hydrogen peroxide ; methyl orange ; oxidation ; pH
    Language English
    Dates of publication 2022-0218
    Size p. 6025-6036.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/d2ra00218c
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Superior quality chemically reduced graphene oxide for high performance EMI shielding materials

    Sadek, Ramy / Sharawi, Mohammad S. / Dubois, Charles / Tantawy, Hesham / Chaouki, Jamal

    RSC advances. 2022 Aug. 12, v. 12, no. 35

    2022  

    Abstract: The chemical reduction process of graphene oxide combined with a mild and controllable thermal treatment under vacuum at 200 °C for 4 hours provided a cost-effective, scalable, and high-yield route for Reduced Graphene Oxide (RGO) industrial production ... ...

    Abstract The chemical reduction process of graphene oxide combined with a mild and controllable thermal treatment under vacuum at 200 °C for 4 hours provided a cost-effective, scalable, and high-yield route for Reduced Graphene Oxide (RGO) industrial production and became a potential candidate for producing electromagnetic interference (EMI) shielding. We investigated graphite, and RGO using l-ascorbic acid and Sodium borohydride before and after thermal treatment by carefully evaluating the chemical and morphological structures. The thermally treated l-ascorbic Acid reduction route (TCRGOL) conductivity was 2.14 × 10³ S m⁻¹ and total shielding efficiency (SET) based on mass loadings per area of shielding was 94 dB with about one-tenth less graphite weight and surpassing other graphene reduction mechanisms in the frequency range of 8.2–12.4 GHz, i.e., X-band, at room temperature while being tested using the waveguide line technique. The developed treatment represents valuable progress in the path to chemical reduction using a safe reducing agent and offering superior quality RGO rarely achieved with the top-down technique, providing a high EMI shielding performance.
    Keywords ambient temperature ; ascorbic acid ; chemical reduction ; cost effectiveness ; electromagnetic interference ; graphene ; graphene oxide ; heat treatment ; sodium borohydride
    Language English
    Dates of publication 2022-0812
    Size p. 22608-22622.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/d2ra02678c
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: Mineralogical and natural radioactivity investigations of Wadi El Reddah stream sediments

    Mira, Hamed I. / Abed, Neveen S. / Tantawy, Hesham R. / Tawfic, A. F.

    International Journal of Environmental Analytical Chemistry. 2022 Dec. 23, v. 102, no. 17 p.5339-5355

    2022  

    Abstract: Wadi El Reddah (valley), Central Eastern Desert, Egypt extends in North-South direction, it represents a semi-closed basin with only one outlet in its northern tip. Wadi El Reddah is mainly surrounded by scattered exposures in a sequence of metagabbro- ... ...

    Abstract Wadi El Reddah (valley), Central Eastern Desert, Egypt extends in North-South direction, it represents a semi-closed basin with only one outlet in its northern tip. Wadi El Reddah is mainly surrounded by scattered exposures in a sequence of metagabbro-diorite and metavolcanics complex in addition to wide sector of Hammamat sedimentary rocks, monzongranites of Gabal El Reddah, perthitic leucogranites of Gabal Gattar as well as swarms of post-granitic dykes. The studied sediments showed wide variation in their Uranium, Thorium, Radium (eU) and potassium (K%) contents. Uranium ranges from 5 to 51 ppm, with an average of 17.33 ppm, Th contents between 16 and 141 ppm, with 32.47 ppm as an average. Ra (eU) varies between 5 and 26 ppm with an average of 9.56 ppm. While potassium falls between 2.19% and 4.41% with an average of 3.19%. The disequilibrium conditions in the stream sediments under investigation indicated that they are mostly recent which is due to the fact that most of the radiometric measurements are lower than the chemical measurements. eTh/eU ratio values of old uranium deposits in the studied sediments suggested mineralisation in an environment of rapid deposition of rock detritus and poor weathering with the dominance of detrital radioactive minerals like thorite, samarskite, euxenite and xenotime.
    Keywords analytical chemistry ; basins ; detritus ; mineralization ; potassium ; radioactivity ; radiometry ; radium ; streams ; thorium ; uranium ; Egypt ; wadi El Reddah ; minerals
    Language English
    Dates of publication 2022-1223
    Size p. 5339-5355.
    Publishing place Taylor & Francis
    Document type Article ; Online
    ZDB-ID 120480-4
    ISSN 1029-0397 ; 0306-7319 ; 0092-9085
    ISSN (online) 1029-0397
    ISSN 0306-7319 ; 0092-9085
    DOI 10.1080/03067319.2020.1796991
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 81/708: Show issues

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  5. Article ; Online: Promising antimicrobial and antibiofilm activities of reduced graphene oxide-metal oxide (RGO-NiO, RGO-AgO, and RGO-ZnO) nanocomposites.

    Elbasuney, Sherif / El-Sayyad, Gharieb S / Tantawy, Hesham / Hashem, Amr H

    RSC advances

    2021  Volume 11, Issue 42, Page(s) 25961–25975

    Abstract: Microbial infections are considered one of the most dangerous infections in humans due to their resistance to most antimicrobial agents. In this study, nanocomposites based on reduced graphene oxide (RGO) and metal oxides (NiO, AgO, and ZnO) were ... ...

    Abstract Microbial infections are considered one of the most dangerous infections in humans due to their resistance to most antimicrobial agents. In this study, nanocomposites based on reduced graphene oxide (RGO) and metal oxides (NiO, AgO, and ZnO) were fabricated. The graphite precursor and RGO were characterized by XRD, Raman spectroscopy, SEM, and HRTEM, while SEM, XRD, and EDX mapping analysis validated the synthesized nanocomposites. In addition, ZOI and MIC were employed to test the antimicrobial potential, while their antibiofilm activity and the effect of UV illumination were also investigated. Finally, reaction mechanism determination was performed using SEM analysis. The results revealed that all the synthesized nanocomposites (RGO-NiO, RGO-AgO, and RGO-ZnO) had outstanding antimicrobial activity against Gram-negative bacteria (
    Language English
    Publishing date 2021-07-28
    Publishing country England
    Document type Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/d1ra04542c
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Advances of the highly efficient and stable visible light active photocatalyst Zr(IV)-phthalate coordination polymer for the degradation of organic contaminants in water.

    Abuzalat, Osama / Tantawy, Hesham / Abdlaty, Ramy / Elfiky, Mona / Baraka, Ahmad

    Dalton transactions (Cambridge, England : 2003)

    2021  Volume 50, Issue 24, Page(s) 8600–8611

    Abstract: This work presents the restoration of the Zr-phthalate coordination polymer (Zr-Ph CP) via valuable application in photocatalysis. Zr-Ph CP was facilely synthesized using a soft hydrothermal method at 70 °C, and was characterized utilizing FTIR, Raman ... ...

    Abstract This work presents the restoration of the Zr-phthalate coordination polymer (Zr-Ph CP) via valuable application in photocatalysis. Zr-Ph CP was facilely synthesized using a soft hydrothermal method at 70 °C, and was characterized utilizing FTIR, Raman Spectrosopy, XPS, PXRD, SEM/EDX, BET, and a hyperspectral camera. Assessment of its photocatalytic degradation potential was performed against two different dyes, the cationic methylene blue (MB) and the anionic methyl orange (MO), as frequent models of organic contaminants, under properly selected mild visible illumination (9 W) where the bandgap energy (Eg) was determined to be 2.72 eV. Effects of different initial pH values and different dyes' initial concentrations were covered. Photocatalytic degradation studies showed that Zr-Ph CP effectively degraded both dyes for initial pH 7 within about 40-60 minutes. Degradation rate constants were calculated as 0.17 and 0.13 min-1 for MB and MO, respectively. Generally, both direct and indirect mechanisms share in the degradation, where adsorption has shown an important role. The repeated use of Zr-Ph CP does not significantly affect its photocatalytic performance suggesting high water stability.
    Language English
    Publishing date 2021-06-02
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
    ISSN (online) 1477-9234 ; 1364-5447
    ISSN 0300-9246 ; 1477-9226
    DOI 10.1039/d1dt01143j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Superior quality chemically reduced graphene oxide for high performance EMI shielding materials.

    Sadek, Ramy / Sharawi, Mohammad S / Dubois, Charles / Tantawy, Hesham / Chaouki, Jamal

    RSC advances

    2022  Volume 12, Issue 35, Page(s) 22608–22622

    Abstract: The chemical reduction process of graphene oxide combined with a mild and controllable thermal treatment under vacuum at 200 °C for 4 hours provided a cost-effective, scalable, and high-yield route for Reduced Graphene Oxide (RGO) industrial production ... ...

    Abstract The chemical reduction process of graphene oxide combined with a mild and controllable thermal treatment under vacuum at 200 °C for 4 hours provided a cost-effective, scalable, and high-yield route for Reduced Graphene Oxide (RGO) industrial production and became a potential candidate for producing electromagnetic interference (EMI) shielding. We investigated graphite, and RGO using l-ascorbic acid and Sodium borohydride before and after thermal treatment by carefully evaluating the chemical and morphological structures. The thermally treated l-ascorbic Acid reduction route (TCRGOL) conductivity was 2.14 × 10
    Language English
    Publishing date 2022-08-12
    Publishing country England
    Document type Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/d2ra02678c
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Designing bimetallic zeolitic imidazolate frameworks (ZIFs) for aqueous catalysis: Co/Zn-ZIF-8 as a cyclic-durable catalyst for hydrogen peroxide oxidative decomposition of organic dyes in water.

    Abuzalat, Osama / Tantawy, Hesham / Basuni, Mustafa / Alkordi, Mohamed H / Baraka, Ahmad

    RSC advances

    2022  Volume 12, Issue 10, Page(s) 6025–6036

    Abstract: ZIF-8 is well known hybrid material that is self-assembled from inorganic and organic moieties. It has several potential applications due to its unique structure. One of these potential applications is in advanced oxidation processes (AOP) ...

    Abstract ZIF-8 is well known hybrid material that is self-assembled from inorganic and organic moieties. It has several potential applications due to its unique structure. One of these potential applications is in advanced oxidation processes (AOP)
    Language English
    Publishing date 2022-02-18
    Publishing country England
    Document type Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/d2ra00218c
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Synthesis and applicability of reduced graphene oxide/porphyrin nanocomposite as photocatalyst for waste water treatment and medical applications.

    El-Khawaga, Ahmed M / Tantawy, Hesham / Elsayed, Mohamed A / Abd El-Mageed, Ahmed I A

    Scientific reports

    2022  Volume 12, Issue 1, Page(s) 17075

    Abstract: This study presents the synthesis and doping of reduced graphene oxide (rGO) with synthesized porphyrin (5,15-bisdodecyl porphyrin, C12P) nanoparticles to fabricate reduced graphene oxide-porphyrin (rGO-P) nanocomposite as well as demonstrates their ... ...

    Abstract This study presents the synthesis and doping of reduced graphene oxide (rGO) with synthesized porphyrin (5,15-bisdodecyl porphyrin, C12P) nanoparticles to fabricate reduced graphene oxide-porphyrin (rGO-P) nanocomposite as well as demonstrates their outstanding removal activity of azo dye and antimicrobial potential. The synthesized porphyrin, rGO, and rGO-P nanocomposites were characterised using SEM, HRTEM, Raman spectroscopy, XRD,
    MeSH term(s) Anti-Bacterial Agents/chemistry ; Anti-Bacterial Agents/pharmacology ; Antifungal Agents ; Azo Compounds ; Coloring Agents ; Congo Red ; Environmental Pollutants ; Graphite/chemistry ; Nanocomposites/chemistry ; Porphyrins/pharmacology ; Water Purification
    Chemical Substances Anti-Bacterial Agents ; Antifungal Agents ; Azo Compounds ; Coloring Agents ; Environmental Pollutants ; Porphyrins ; graphene oxide ; Congo Red (3U05FHG59S) ; Graphite (7782-42-5)
    Language English
    Publishing date 2022-10-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-21360-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Effect of sulfur doping of zinc-imidazole coordination polymer (ZnIm CP) as a novel photocatalyst for degradation of ionic dyes.

    Mohsen, Mostafa / Baraka, Ahmad / Naeem, Ibrahim / Tantawy, Hesham / Awaad, Mohamed / Abuzalat, Osama

    BMC chemistry

    2022  Volume 16, Issue 1, Page(s) 86

    Abstract: Zinc-Imidazole coordination polymer (ZnImCP) was simply synthesized hydrothermally at relatively low temperature (70 °C) from zinc acetate and imidazole. ZnImCP was treated by sulfide solution to produce sulfur-doped samples (S-ZnImCPs). Structures of ... ...

    Abstract Zinc-Imidazole coordination polymer (ZnImCP) was simply synthesized hydrothermally at relatively low temperature (70 °C) from zinc acetate and imidazole. ZnImCP was treated by sulfide solution to produce sulfur-doped samples (S-ZnImCPs). Structures of the synthesized ZnImCP and S-ZnImCPs were characterized through FTIR, PXRD, and, Raman, SEM/EDX, N
    Language English
    Publishing date 2022-11-04
    Publishing country Switzerland
    Document type Journal Article
    ISSN 2661-801X
    ISSN (online) 2661-801X
    DOI 10.1186/s13065-022-00877-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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