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Aboelwafa MR, Shaheen SD. Microhardness, Surface Roughness, and Wear Resistance Enhancement of Reinforced Conventional Glass Ionomer Cement Using Fluorinated Graphene Oxide Nanosheets. Eur J Dent 2024. [PMID: 38759994 DOI: 10.1055/s-0044-1785188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/19/2024] Open
Abstract
OBJECTIVES Conventional glass ionomer cements (GICs) have been considered the most prevalent restorative material however; the reduced mechanical qualities and decreased wear resistance have been the main challenges facing their wide clinical application. This study was designed to assess the mechanical properties of fluorinated graphene (FG) oxide-modified conventional GIC. MATERIALS AND METHODS Composites of FG/GIC samples were prepared using (Medifil from PROMEDICA, Germany, shade A3) at different concentrations (0wt%) control group and (1wt%, 2wt% and 3wt% FG) groups using cylindrical molds (3mm × 6mm). FG was prepared using hydrothermal technique and characterized using XPERT-PRO Powder Diffractometer system for X-ray diffraction analysis and JEOL JEM-2100 high resolution transmission electron microscope. Vickers' hardness and wear resistance of GI samples were measured. Mechanical abrasion was performed via three-body tooth brushing wear test using ROBOTA chewing simulator coupled with a thermocycling protocol (Model ACH-09075DC-T, AD-Tech Technology Co., Ltd., Leinfelden-Echterdingen, Germany). STATISTICAL ANALYSIS Comparisons between groups with respect to normally distributed numeric variables were performed using one-way analysis of variance test followed by posthoc test. While paired t-test was utilized for comparing data within the same group. RESULTS The surface roughness values of GICs (1wt% FG) and (2wt% FG) composites were significantly lower than those of the control and 3wt%FG groups. Vickers' hardness numbers were significantly higher in FG/GICs composites than in the control group (p≤0.05). CONCLUSION GIC/FG combinations have sufficient strength to resist the occlusion stresses with improved hardness as compared with conventional GIC. GIC/FG appeared to be a promising restorative material.
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Affiliation(s)
- Mona R Aboelwafa
- Department of Conservative Dentistry, Faculty of Dentistry, Sinai University, Kantara, Ismailia, Egypt
| | - Sarah D Shaheen
- Department of Operative Dentistry, Faculty of Oral and Dental Surgery, Misr University for Science and Technology, Cairo, Egypt
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Raval H, Sharma R, Srivastava A. Novel protocol for fouling detection of reverse osmosis membrane based on methylene blue colorimetric method by image processing technique. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2024; 89:513-528. [PMID: 38358486 PMCID: wst_2023_425 DOI: 10.2166/wst.2023.425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
In the current study, a novel methylene blue (MB)-based colorimetric method for a quick, inexpensive, and facile approach for the determination of fouling intensity of reverse osmosis (RO) membrane has been reported. This technique is based on the interaction of MB with the organic foulants and shows the corresponding change in the colour intensity depending on the severity of fouling. The organic foulants, such as albumin, sodium alginate, and carboxymethyl cellulose (CMC), were chosen as model foulants, and the membranes were subjected to foul under extreme fouling conditions. The fouled membranes underwent an MB treatment followed by image-processing analyses. The severity of surface fouling of membranes was evaluated in terms of fouling intensity and correlated with the corresponding decline of permeate flux. The maximum fouling intensity of the albumin, sodium alginate, and CMC sodium were found to be 8.83, 23.38, and 9.19%, respectively, for the definite concentration of foulants. The physico-chemical interactions of the given foulants and MB were confirmed by changes in zeta potentials and increased sizes of the foulant by the dynamic light scattering technique. The surface fouling over the membrane surface was confirmed by the characterization of membranes.
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Affiliation(s)
- Hiren Raval
- Membrane Science and Separation Technology Division, Council of Scientific and Industrial Research-Central Salt and Marine, Chemicals Research Institute (CSIR-CSMCRI), Gijubhai Badheka Marg, Bhavnagar, Gujarat 364 002, India E-mail:
| | - Ritika Sharma
- Membrane Science and Separation Technology Division, Council of Scientific and Industrial Research-Central Salt and Marine, Chemicals Research Institute (CSIR-CSMCRI), Gijubhai Badheka Marg, Bhavnagar, Gujarat 364 002, India
| | - Ashish Srivastava
- Membrane Science and Separation Technology Division, Council of Scientific and Industrial Research-Central Salt and Marine, Chemicals Research Institute (CSIR-CSMCRI), Gijubhai Badheka Marg, Bhavnagar, Gujarat 364 002, India
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Zheng ALT, Ohno T, Andou Y. Recent Progress in Photocatalytic Efficiency of Hybrid Three-Dimensional (3D) Graphene Architectures for Pollution Remediation. Top Catal 2022. [DOI: 10.1007/s11244-022-01610-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Jee H, Jang J, Kang Y, Eisa T, Chae KJ, Kim IS, Yang E. Enhancing the Dye-Rejection Efficiencies and Stability of Graphene Oxide-Based Nanofiltration Membranes via Divalent Cation Intercalation and Mild Reduction. MEMBRANES 2022; 12:membranes12040402. [PMID: 35448372 PMCID: PMC9031111 DOI: 10.3390/membranes12040402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 03/28/2022] [Accepted: 03/31/2022] [Indexed: 11/24/2022]
Abstract
Laminar graphene oxide (GO) membranes have demonstrated great potential as next-generation water-treatment membranes because of their outstanding performance and physicochemical properties. However, solute rejection and stability deterioration in aqueous solutions, which are caused by enlarged nanochannels due to hydration and swelling, are regarded as serious issues in the use of GO membranes. In this study, we attempt to use the crosslinking of divalent cations to improve resistance against swelling in partially reduced GO membranes. The partially reduced GO membranes intercalated by divalent cations (i.e., Mg2+) exhibited improved dye-rejection efficiencies of up to 98.40%, 98.88%, and 86.41% for methyl orange, methylene blue, and rhodamine B, respectively. In addition, it was confirmed that divalent cation crosslinking and partial reduction could strengthen mechanical stability during testing under harsh aqueous conditions (i.e., strong sonication).
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Affiliation(s)
- Hobin Jee
- Department of Marine Environmental Engineering, Gyeongsang National University, Tongyoung 53064, Korea;
| | - Jaewon Jang
- KEPCO Research Institute (KEPRI), Korea Electric Power Corporation (KEPCO), Naju 58277, Korea;
| | - Yesol Kang
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea; (Y.K.); (I.S.K.)
| | - Tasnim Eisa
- Department of Environmental Engineering, Korea Maritime and Ocean University, Busan 49112, Korea; (T.E.); (K.-J.C.)
| | - Kyu-Jung Chae
- Department of Environmental Engineering, Korea Maritime and Ocean University, Busan 49112, Korea; (T.E.); (K.-J.C.)
| | - In S. Kim
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea; (Y.K.); (I.S.K.)
| | - Euntae Yang
- Department of Marine Environmental Engineering, Gyeongsang National University, Tongyoung 53064, Korea;
- Correspondence:
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Zheng ALT, Sabidi S, Ohno T, Maeda T, Andou Y. Cu 2O/TiO 2 decorated on cellulose nanofiber/reduced graphene hydrogel for enhanced photocatalytic activity and its antibacterial applications. CHEMOSPHERE 2022; 286:131731. [PMID: 34388866 DOI: 10.1016/j.chemosphere.2021.131731] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 07/14/2021] [Accepted: 07/28/2021] [Indexed: 06/13/2023]
Abstract
Photocatalysis has gained attention as a viable wastewater remediation technique. However, the difficulty of recovering powder-based photocatalyst has often become a major limitation for their on-site practical application. Herein, we report on the successful in-situ preparation of a novel three-dimensional (3D) photocatalyst consisting of Cu2O/TiO2 loaded on a cellulose nanofiber (CNF)/reduced graphene hydrogel (rGH) via facile hydrothermal treatment and freeze-drying. The 3D macrostructure not only provides a template for the anchoring of Cu2O and TiO2 but also provides an efficient electron transport pathway for enhanced photocatalytic activity. The results showed that the Cu2O and TiO2 were uniformly loaded onto the aerogel framework resulting in the composites with large surface area with exposed actives sites. As compared to bare rGH, CNF/rGH, Cu2O/CNF/rGH and TiO2/CNF/rGH, the Cu2O/TiO2/CNF/rGH showed improved photocatalytic activity for methyl orange (MO) degradation. MO degradation pathway is proposed based on GC-MS analysis. The enhanced photoactivity can be attributed to the charge transfer and electron-hole separation from the synergistic effect of Cu2O/TiO2 anchored on CNF/rGH. In terms of their anti-bacterial activity towards Staphylococcus aureus and Escherichia coli, the synergistic effect of the Cu2O/TiO2 anchored on the CNF/rGH framework showed excellent activity towards the bacteria.
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Affiliation(s)
- Alvin Lim Teik Zheng
- Department of Life Science and Systems Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka, 808-0196, Japan
| | - Sarah Sabidi
- Department of Life Science and Systems Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka, 808-0196, Japan
| | - Teruhisa Ohno
- Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology, Fukuoka, 804-8550, Japan
| | - Toshinari Maeda
- Department of Life Science and Systems Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka, 808-0196, Japan; Collaborative Research Centre for Green Materials on Environmental Technology, Kyushu Institute of Technology, Fukuoka, 808-0196, Japan
| | - Yoshito Andou
- Department of Life Science and Systems Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka, 808-0196, Japan; Collaborative Research Centre for Green Materials on Environmental Technology, Kyushu Institute of Technology, Fukuoka, 808-0196, Japan.
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Zheng ALT, Boonyuen S, Li GY, Ngee LH, Andou Y. Design of reduced graphene hydrogel with alkylamine surface functionalization through immersion/agitation method and its adsorption mechanism. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.131008] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Sun H, Lin Y, Takeshi H, Wang X, Wu D, Tian Y. Synthesis of 3D graphene-based materials and their applications for removing dyes and heavy metals. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:52625-52650. [PMID: 34448139 DOI: 10.1007/s11356-021-15649-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Accepted: 07/21/2021] [Indexed: 06/13/2023]
Abstract
Contamination of water streams by dyes and heavy metals has become a major problem due to their persistence, accumulation, and toxicity. Therefore, it is essential to eliminate and/or reduce these contaminants before discharge into the natural environment. In recent years, 3D graphene has drawn intense research interests owing to its large surface area, superior charge conductivity, and thermal conductivity properties. Due to their unique surface and structural properties, 3D graphene-based materials (3D GBMs) are regarded as ideal adsorbents for decontamination and show great potential in wastewater or exhaust gas treatment. Here, this minireview summarizes the recent progress on 3D GBMs synthesis and their applications for adsorbing dyes and heavy metals from wastewater based on the structures and properties of 3D GBMs, which provides valuable insights into 3D GBMs' application in the environmental field.
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Affiliation(s)
- Hefei Sun
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China.
| | - Yan Lin
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Hagio Takeshi
- Institute of Materials Innovation, Institutes of Innovation for Future Society, Nagoya University, Nagoya, Japan
| | - Xinze Wang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Deyi Wu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
| | - Yanqin Tian
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China
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