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  1. Article ; Online: Graphene Oxide Membrane Reactor for Electrochemical Deuteration Reactions.

    Sahroni, Imam / Kodama, Taiga / Ahmad, Muhammad Sohail / Nakahara, Takeru / Inomata, Yusuke / Kida, Tetsuya

    Nano letters

    2024  Volume 24, Issue 12, Page(s) 3590–3597

    Abstract: The deuteration of organic molecules is considerably important in organic and medicinal chemistry. An electrochemical membrane reactor using proton-conducting graphene oxide (GO) nanosheets was developed to synthesize valuable deuterium-labeled products ... ...

    Abstract The deuteration of organic molecules is considerably important in organic and medicinal chemistry. An electrochemical membrane reactor using proton-conducting graphene oxide (GO) nanosheets was developed to synthesize valuable deuterium-labeled products via an efficient hydrogen-to-deuterium (H/D) exchange under mild conditions at ambient temperature and atmospheric pressure. Deuterons (D
    Language English
    Publishing date 2024-03-15
    Publishing country United States
    Document type Journal Article
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.3c04243
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Visible light-responsive photocatalyst of SnO2/rGO prepared using Pometia pinnata leaf extract

    Sujatmiko Febrian / Sahroni Imam / Fadillah Ganjar / Fatimah Is

    Open Chemistry, Vol 19, Iss 1, Pp 174-

    2021  Volume 183

    Abstract: The composite of tin oxide-reduced graphene oxide (SnO2/rGO) was prepared via a green synthesis of rGO using Pometia pinnata leaf extract followed by the dispersion of the SnO2 precursor. The composite was employed as a photocatalyst for the removal of ... ...

    Abstract The composite of tin oxide-reduced graphene oxide (SnO2/rGO) was prepared via a green synthesis of rGO using Pometia pinnata leaf extract followed by the dispersion of the SnO2 precursor. The composite was employed as a photocatalyst for the removal of methylene blue (MB) under UV and visible light. A variety of spectroscopic and analytical techniques, consisting of X-ray diffraction, Fourier-transform infrared, scanning transmission electron microscopy, photoluminescence spectroscopy, and a transmission electron microscope, was used to characterize the physical properties of the photocatalyst. The characterizations represent the dispersed SnO2 nanoparticles in the rutile phase with the mean particle size of 72 nm. The photocatalytic activity experiments revealed the superiority of the composite for photodegradation application under the visible light source compared to UV light. This visible light-responsive property is fit with photoluminescence intensity in the visible light range. It was found that SnO2/rGO yields the degradation efficiency of ca. 98.28% within 90 min.
    Keywords photocatalyst ; photodegradation ; reduced graphene oxide ; sno2 ; Chemistry ; QD1-999
    Subject code 535
    Language English
    Publishing date 2021-02-01T00:00:00Z
    Publisher De Gruyter
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Temperature-Induced Nanostructure Transition for Supramolecular Gelation in Water.

    Chakravarthy, Rajan Deepan / Sahroni, Imam / Wang, Chen-Wen / Mohammed, Mohiuddin / Lin, Hsin-Chieh

    ACS nano

    2023  Volume 17, Issue 12, Page(s) 11805–11816

    Abstract: Thermogel is an injectable biomaterial that functions at body temperatures due to the ease of the sol-to-gel transition. However, most conventional physically cross-linked thermogels generally have relatively low stiffness, which limits various ... ...

    Abstract Thermogel is an injectable biomaterial that functions at body temperatures due to the ease of the sol-to-gel transition. However, most conventional physically cross-linked thermogels generally have relatively low stiffness, which limits various biomedical applications, particularly for stem-cell-based studies. While chemical cross-linking through double-network (DN) structures can increase the stiffness of the hydrogel, they generally lack injectable and thermoresponsive properties due to strong covalent bonds between molecules. To address this challenge, we have developed a temperature-induced nanostructure transition (TINT) system for preparing physical DN supramolecular hydrogels. These hydrogels possess injectable, thermoreversible characteristics and relatively high storage modulus (
    MeSH term(s) Humans ; Temperature ; Water ; Hydrogels/chemistry ; Polyethylene Glycols/chemistry ; Peptides/chemistry ; Nanostructures
    Chemical Substances Water (059QF0KO0R) ; Hydrogels ; Polyethylene Glycols (3WJQ0SDW1A) ; Peptides
    Language English
    Publishing date 2023-06-09
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.3c02753
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Fe3O4@SiO2 nanoflakes synthesized using biogenic silica from Salacca zalacca leaf ash and the mechanistic insight into adsorption and photocatalytic wet peroxidation of dye

    Purwiandono Gani / Fatimah Is / Sahroni Imam / Citradewi Putwi Widya / Kamari Azlan / Sagadevan Suresh / Oh Won-Chun / Doong Ruey-an

    Green Processing and Synthesis, Vol 11, Iss 1, Pp 345-

    2022  Volume 360

    Abstract: Water pollution has become one of the most serious environmental issues recently, especially in relation to chemical-containing wastewater. Uncontrolled industrial waste, including large amounts of dye-containing wastewater from textile industries, needs ...

    Abstract Water pollution has become one of the most serious environmental issues recently, especially in relation to chemical-containing wastewater. Uncontrolled industrial waste, including large amounts of dye-containing wastewater from textile industries, needs intensive attention. In this work, the synthesis of Fe3O4@SiO2 nanocomposite biogenic silica from Salacca zalacca leaf ash was conducted for the photo-Fenton-like degradation of dye waste. The use of Salacca zalacca leaf ash and the nanoflake form is the novelty of this work. The physicochemical characterization of the material was conducted using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and diffuse reflectance UV-visible spectroscopy (UV-DRS) analyses, and photocatalytic activity of material was investigated in wet peroxidation of rhodamine B and batik wastewater. The results showed homogeneously dispersed Fe3O4 in SiO2 support with a nanoflake form, and a crystallite size of 44.9 nm was obtained. XRD investigation revealed the single phase of Fe3O4, which is consistent with the TEM analysis. The bandgap energy of 2.21 eV was reported from UV-DRS measurements, which influenced the increasing photocatalytic activity and reusability of the nanocomposite compared to pure Fe3O4. The photocatalyst showed the maximum degradation efficiency (DE) of 99.9% after 60 min, and the reusability feature was expressed, as there was an insignificant change in the DE over the fifth cycle of use. The material exhibited photocatalytic oxidation of batik wastewater as the removal of total suspended solids, chemical oxygen demand, and color reached 95.55%, 89.59%, and 90.00%, respectively.
    Keywords biogenic silica ; fe3o4@sio2 ; nanocomposite ; dye waste ; advanced oxidation process ; Chemistry ; QD1-999
    Subject code 540
    Language English
    Publishing date 2022-04-01T00:00:00Z
    Publisher De Gruyter
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article: Magnetically-separable photocatalyst of magnetic biochar from snake fruit peel for rhodamine B photooxidation

    Fatimah, Is / Purwiandono, Gani / Sahroni, Imam / Wijayana, Adytia / Faraswati, Mediana / Dwi Putri, Annisa / Oh, Won-Chun / Doong, Ruey-an

    Environmental nanotechnology, monitoring & management. 2022 May, v. 17

    2022  

    Abstract: Magnetically-separable photocatalyst of magnetic biochar has been prepared from snake fruit peel and utilize for photooxidation of rhodamine B. The synthesis was performed by immobilizing iron oxide precursors via co-precipitation followed by ... ...

    Abstract Magnetically-separable photocatalyst of magnetic biochar has been prepared from snake fruit peel and utilize for photooxidation of rhodamine B. The synthesis was performed by immobilizing iron oxide precursors via co-precipitation followed by carbonization under N₂ gas at 400 °C for h. The obtained magnetic biochar was characterized using X-ray diffraction, scanning electron microscopy-energy dispersive x-ray spectroscopy, UV–visible diffuse reflectance spectroscopy, transmission electron microscopy, x-ray photoelectron spectroscopy, and gas sorption analysis. The results from XRD analysis showed that magnetic biochar composed as the dispersed Fe₃O₄ nanoparticles with slightly γ- Fe₂O₃ phase. TEM analysis concluded that the particle size is ranging at 5–20 nm. Photocatalytic activity studies of MBC were performed for rhodamine B photooxidation at various pHs and H₂O₂ concentrations. Photooxidation of rhodamine B followed second-order kinetics at the optimum pH of 7 and H₂O₂ concentration of 0.5% with the degradation efficiency of 99.9%. Insignificant change of degradation efficiency until fifth cycle indicated that magnetic biochar has stability and potential to be applied in larger scale.
    Keywords Salacca zalacca ; X-radiation ; X-ray diffraction ; X-ray photoelectron spectroscopy ; administrative management ; biochar ; carbonization ; coprecipitation ; fruit peels ; magnetism ; pH ; particle size ; photocatalysis ; photocatalysts ; photooxidation ; reflectance spectroscopy ; rhodamines ; sorption ; transmission electron microscopy
    Language English
    Dates of publication 2022-05
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 2821777-9
    ISSN 2215-1532
    ISSN 2215-1532
    DOI 10.1016/j.enmm.2022.100669
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  6. Article: Boron Doped Graphene Quantum Structure and MoS

    Riyanto / Sahroni, Imam / Bindumadhavan, Kartick / Chang, Pei-Yi / Doong, Ruey-An

    Frontiers in chemistry

    2019  Volume 7, Page(s) 116

    Abstract: Herein, the boron-doped graphene quantum structure (BGQS), which contains both the advantages of 0-D graphene quantum dot and 2-D reduced graphene oxide, has been fabricated by top-down hydrothermal method and then mixed with molybdenum sulfide ( ... ...

    Abstract Herein, the boron-doped graphene quantum structure (BGQS), which contains both the advantages of 0-D graphene quantum dot and 2-D reduced graphene oxide, has been fabricated by top-down hydrothermal method and then mixed with molybdenum sulfide (MoS
    Language English
    Publishing date 2019-03-13
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2711776-5
    ISSN 2296-2646
    ISSN 2296-2646
    DOI 10.3389/fchem.2019.00116
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Physicochemical characteristics and photocatalytic performance of TiO2/SiO2 catalyst synthesized using biogenic silica from bamboo leaves

    Fatimah, Is / Prakoso, Nurcahyo Iman / Sahroni, Imam / Musawwa, M. Miqdam / Sim, Yoke-Leng / Kooli, Fethi / Muraza, Oki

    Heliyon. 2019 Nov., v. 5, no. 11

    2019  

    Abstract: In this work, TiO₂/SiO₂ composite photocatalysts were prepared using biogenic silica extracted from bamboo leaves and titanium tetraisopropoxide as a titania precursor via a sol–gel mechanism. A study of the physicochemical properties of materials as a ... ...

    Abstract In this work, TiO₂/SiO₂ composite photocatalysts were prepared using biogenic silica extracted from bamboo leaves and titanium tetraisopropoxide as a titania precursor via a sol–gel mechanism. A study of the physicochemical properties of materials as a function of their titanium dioxide content was conducted using Fourier transform infrared spectroscopy, a scanning electron microscope, a diffuse reflectance ultraviolet-visible (UV-vis) spectrophotometer, and a gas sorption analyzer. The relationship between physicochemical parameters and photocatalytic performance was evaluated using the methylene blue (MB) photocatalytic degradation process under UV irradiation with and without the addition of H₂O₂ as an oxidant. The results demonstrated that increasing the TiO₂ helps enhance the parameters of specific surface area, the pore volume, and the particle size of titanium dioxide, while the band gap energy reaches a maximum of 3.21 eV for 40% and 60% Ti content. The composites exhibit photocatalytic activity with the MB degradation with increasing photocatalytic efficiency since the composites with 40 and 60% wt. of TiO₂ demonstrated the higher degradation rate compared with TiO₂ in the presence and absence of H₂O₂. This higher rate is correlated with the higher specific surface area and band gap energy compared with those of TiO₂.
    Keywords Fourier transform infrared spectroscopy ; bamboos ; energy ; methylene blue ; oxidants ; particle size ; photocatalysis ; photocatalysts ; reflectance ; silica ; sorption ; spectrophotometers ; surface area ; titanium ; titanium dioxide ; ultraviolet radiation
    Language English
    Dates of publication 2019-11
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2019.e02766
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  8. Article: Physicochemical characteristics and photocatalytic performance of TiO

    Fatimah, Is / Prakoso, Nurcahyo Iman / Sahroni, Imam / Musawwa, M Miqdam / Sim, Yoke-Leng / Kooli, Fethi / Muraza, Oki

    Heliyon

    2019  Volume 5, Issue 11, Page(s) e02766

    Abstract: In this work, ... ...

    Abstract In this work, TiO
    Language English
    Publishing date 2019-11-14
    Publishing country England
    Document type Journal Article
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2019.e02766
    Database MEDical Literature Analysis and Retrieval System OnLINE

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