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  • 1
    Online Resource
    Online Resource
    Sustainable Synthesis and Characterizationof Corncob‐Derived Graphene Oxide
    Wiley ; 2023
    In:  ChemistrySelect Vol. 8, No. 29 ( 2023-08-04)
    Details
    In: ChemistrySelect, Wiley, Vol. 8, No. 29 ( 2023-08-04)
    Abstract: Recently, though graphene oxide (GO) has shown promising applications in many fields, there have not been many studies focusing on exploiting the source of synthetic precursors of GO. Herein, GO was synthesized from the cellulose of corncob by corncob alkalization, bleaching cellulose, pyrolysis, and improved Hummer's method. It was found that pyrolysis plays an important role in the graphitization of cellulose precursors with the catalyst Fe(NO 3 ) 3 to form Gi‐Fe(NO 3 ) 3 . The GO material synthesized from Gi‐Fe(NO 3 ) 3 was characterized by advanced analytical methods. The X‐ray diffraction pattern of Gi‐Fe(NO 3 ) 3 shows the formation of a diffraction peak at the crystal plane (002), which is characteristic of the graphite material. The synthesized GO underwent a series of changes in material structure and morphology, which are confirmed via transmission electron microscopy images showing a plate‐like structure with folds represented by the dark line. This study demonstrates a sustainable approach that directly utilizes abundant biomass resources for the synthesis of GO material.
    Type of Medium: Online Resource
    ISSN: 2365-6549 , 2365-6549
    URL: Issue
    URL: Article
    DOI: 10.1002/slct.v8.29
    DOI: 10.1002/slct.202301537
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2844262-3
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  • 2
    Online Resource
    Online Resource
    Fabrication of ceramic tube‐supported tetraethyl‐orthosilicate cross‐linked polydimethylsiloxane membranes for separation of furfural–water mixture by pervaporation technology
    Wiley ; 2022
    In:  Journal of Applied Polymer Science Vol. 139, No. 25 ( 2022-07-05)
    Details
    In: Journal of Applied Polymer Science, Wiley, Vol. 139, No. 25 ( 2022-07-05)
    Abstract: In this study, polydimethylsiloxane/tetraethyl‐orthosilicate (PDMS/TEOS) hybrid materials with different TEOS ratios were synthesized by cross‐linking method. Ceramic tube‐supported PDMS/TEOS membranes were fabricated by dip‐coating method. Effect of TEOS content, feed concentration, and feed temperature through separation of a furfural–water mixture by pervaporation (PV) technology was investigated. The highest PV performance was obtained with the total flux of 1.19 kg/m 2 h with TEOS content of 1.8 g, furfural feed concentration of 30 wt.%, operating temperature, and vacuum pressure at 100 kPa and 50 °C, respectively. PDMS/TEOS was successfully synthesized and coated on ceramic tube‐supported with a thickness of 15 μm. The ceramic tube‐supported membrane demonstrated good hydrophobicity with a contact angle of 109.5° and excellent thermal stability at 450 °C. The obtained results demonstrated that the ceramic tube‐supported PDMS/TEOS membrane is potent to be utilized for the separation of the furfural‐water mixture by PV technology.
    Type of Medium: Online Resource
    ISSN: 0021-8995 , 1097-4628
    URL: Issue
    URL: Article
    DOI: 10.1002/app.v139.25
    DOI: 10.1002/app.52380
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 1491105-X
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  • 3
    Online Resource
    Online Resource
    Optimization of Conditions for Removal Phenolic Compounds from Water by a Graphene Oxide Aerogel
    Wiley ; 2022
    In:  ChemistrySelect Vol. 7, No. 26 ( 2022-07-14)
    Details
    In: ChemistrySelect, Wiley, Vol. 7, No. 26 ( 2022-07-14)
    Abstract: In this study, graphene oxide (GO) was prepared from graphite by improved Hummers’ method. Graphene oxide aerogel (GOA) was synthesized via the ice segregation induced self‐assembly method. Various modern analytical methods were utilized to characterize GOA. The results revealed the aerogel structure with a pore size of 100–150 μm, a specific surface area of 515.21 m 2 /g, and a pore volume of 2.08–2.16 cm 3 /g. The synthesized GOA was applied as an adsorbent for the removal of phenol (PN) and bisphenol A (BPA) with a maximum adsorption capacity of 117.65 and 70.17 mg/g, respectively. Response surface methodology involving a rotating central composite design was applied to investigate simultaneously the effects of adsorption variables including adsorption time, pH, and initial concentration on the removal efficiency of GOA for PN or BPA. The results showed that the optimal adsorption efficiency for PN was 92.15 % with an adsorption time of 208.52 min, a pH of 6.08, and an initial PN concentration of 30 mg/L. Regarding BPA, the optimal adsorption efficiency was 95.27 % with an adsorption time of 352.79 min, a pH of 4.91, and an initial BPA concentration of 20 mg/L. The adsorption of both PN and BPA onto GOA was appropriate with the Langmuir model, in which the maximum adsorption capacity of GOA for PN and BPA was 117.65 and 70.175 mg/g, respectively. The results confirmed that the adsorption of PN and BPA onto GOA was monolayer adsorption on a homogeneous surface. The adsorption mechanism of GOA for PN or BPA depended mainly on the electrostatic interaction and hydrogen bonding between −OH of PN, BPA, and oxygen‐containing functional groups of GOA. Besides, π‐π interaction between carbon rings of GOA and PN or BPA also contributed to the enhancement of adsorption performance. The results showed that GOA exhibited potential application in the treatment of organic pollutants. Besides, the evaluation of the morphology of the GOA and the simultaneous effects of different factors can contribute to the advancement of graphene‐based materials and the improvement of wastewater treatment.
    Type of Medium: Online Resource
    ISSN: 2365-6549 , 2365-6549
    URL: Issue
    URL: Article
    DOI: 10.1002/slct.v7.26
    DOI: 10.1002/slct.202104563
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2844262-3
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  • 4
    Online Resource
    Online Resource
    Surface modification of poly(propylene) fabric with graphene oxide‐based silver nanoparticles for antibacterial applications
    Wiley ; 2022
    In:  Journal of Applied Polymer Science Vol. 139, No. 45 ( 2022-12-05)
    Details
    In: Journal of Applied Polymer Science, Wiley, Vol. 139, No. 45 ( 2022-12-05)
    Abstract: Herein, poly(propylene) (PP) was hydrophilized with oxidating agents and solvents, followed by dip‐coating with silver nanoparticles anchored GO sheets (Ag@GO) prepared by the in‐situ method as reported in our previous study to obtain silver@graphene oxide‐coated poly(propylene) (Ag@GO/PP). The impact of the modifying agents, dipping times, and coating concentrations on the antibacterial activities were studied accordingly via the inhibition zone method. The fabrics were re‐hydrophobized with the reduction of Ag@GO and the functionalization with stearic acid (SA) to form silver@reduced graphene oxide‐coated poly(propylene) (Ag@rGO/PP) and silver@graphene oxide/SA‐coated poly(propylene) (Ag@rGO‐SA/PP), respectively. Characterization of pretreated and modified PP samples was carried out by various modern analysis methods. Simultaneously, the cytotoxicity of the active layers, the release of Ag + ions, and durability after washing were also investigated. The obtained results representing PP fabrics pretreated with HNO 3 /isopropanol and dipped in Ag@GO concentration of 2 g/L four times prove a sufficient approach for improving hydrophilization and bio‐compatibility for the PP samples. The fabrics greatly show an impressive interaction with precursors, mostly high antibacterial activity even after four washing cycles via appropriate releasing of Ag + to ensure the safety in usage. They further suggest that the prepared fabrics could be utilized for actual application as a face mask.
    Type of Medium: Online Resource
    ISSN: 0021-8995 , 1097-4628
    URL: Issue
    URL: Article
    DOI: 10.1002/app.v139.45
    DOI: 10.1002/app.53119
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 1491105-X
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