1
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Synthesis of rGO–Nps hybrids with electrocatalytic activity for hydrogen evolution reaction. J Solid State Electrochem 2022. [DOI: 10.1007/s10008-022-05304-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/10/2022]
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2
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Adil SF, Ashraf M, Khan M, Assal ME, Shaik MR, Kuniyil M, Al-Warthan A, Siddiqui MRH, Tremel W, Tahir MN. Advances in Graphene/Inorganic Nanoparticle Composites for Catalytic Applications. CHEM REC 2022; 22:e202100274. [PMID: 35103379 DOI: 10.1002/tcr.202100274] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Revised: 01/02/2022] [Accepted: 01/04/2022] [Indexed: 12/15/2022]
Abstract
Graphene-based nanocomposites with inorganic (metal and metal oxide) nanoparticles leads to materials with high catalytic activity for a variety of chemical transformations. Graphene and its derivatives such as graphene oxide, highly reduced graphene oxide, or nitrogen-doped graphene are excellent support materials due to their high surface area, their extended π-system, and variable functionalities for effective chemical interactions to fabricate nanocomposites. The ability to fine-tune the surface composition for desired functionalities enhances the versatility of graphene-based nanocomposites in catalysis. This review summarizes the preparation of graphene/inorganic NPs based nanocomposites and their use in catalytic applications. We discuss the large-scale synthesis of graphene-based nanomaterials. We have also highlighted the interfacial electronic communication between graphene/inorganic nanoparticles and other factors resulting in increased catalytic efficiencies.
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Affiliation(s)
- Syed Farooq Adil
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Kingdom of Saudi Arabia
| | - Muhammad Ashraf
- Chemistry Department, King Fahd University of Petroleum & Materials, Dhahran, 31261, Kingdom of Saudi Arabia
| | - Mujeeb Khan
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Kingdom of Saudi Arabia
| | - Mohamed E Assal
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Kingdom of Saudi Arabia
| | - Mohammed Rafi Shaik
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Kingdom of Saudi Arabia
| | - Mufsir Kuniyil
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Kingdom of Saudi Arabia
| | - Abdulrahman Al-Warthan
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Kingdom of Saudi Arabia
| | - Mohammed Rafiq H Siddiqui
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Kingdom of Saudi Arabia
| | - Wolfgang Tremel
- Department of Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg 10-14, D-55128, Mainz, Germany
| | - Muhammad Nawaz Tahir
- Chemistry Department, King Fahd University of Petroleum & Materials, Dhahran, 31261, Kingdom of Saudi Arabia.,Interdisciplinary Research Center for Hydrogen and Energy Storage (IRC-HES), King Fahd University of Petroleum and & Minerals, Dhahran, 31261, Saudi Arabia
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3
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Vannozzi L, Catalano E, Telkhozhayeva M, Teblum E, Yarmolenko A, Avraham ES, Konar R, Nessim GD, Ricotti L. Graphene Oxide and Reduced Graphene Oxide Nanoflakes Coated with Glycol Chitosan, Propylene Glycol Alginate, and Polydopamine: Characterization and Cytotoxicity in Human Chondrocytes. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:2105. [PMID: 34443935 PMCID: PMC8399274 DOI: 10.3390/nano11082105] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 08/12/2021] [Accepted: 08/12/2021] [Indexed: 01/23/2023]
Abstract
Recently, graphene and its derivatives have been extensively investigated for their interesting properties in many biomedical fields, including tissue engineering and regenerative medicine. Nonetheless, graphene oxide (GO) and reduced GO (rGO) are still under investigation for improving their dispersibility in aqueous solutions and their safety in different cell types. This work explores the interaction of GO and rGO with different polymeric dispersants, such as glycol chitosan (GC), propylene glycol alginate (PGA), and polydopamine (PDA), and their effects on human chondrocytes. GO was synthesized using Hummer's method, followed by a sonication-assisted liquid-phase exfoliation (LPE) process, drying, and thermal reduction to obtain rGO. The flakes of GO and rGO exhibited an average lateral size of 8.8 ± 4.6 and 18.3 ± 8.5 µm, respectively. Their dispersibility and colloidal stability were investigated in the presence of the polymeric surfactants, resulting in an improvement in the suspension stability in terms of average size and polydispersity index over 1 h, in particular for PDA. Furthermore, cytotoxic effects induced by coated and uncoated GO and rGO on human chondrocytes at different concentrations (12.5, 25, 50 and 100 µg/mL) were assessed through LDH assay. Results showed a concentration-dependent response, and the presence of PGA contributed to statistically decreasing the difference in the LDH activity with respect to the control. These results open the way to a potentially safer use of these nanomaterials in the fields of cartilage tissue engineering and regenerative medicine.
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Affiliation(s)
- Lorenzo Vannozzi
- The BioRobotics Institute, Scuola Superiore Sant’Anna, 56127 Pisa, Italy;
- Department of Excellence in Robotics & AI, Scuola Superiore Sant’Anna, 56127 Pisa, Italy
| | - Enrico Catalano
- The BioRobotics Institute, Scuola Superiore Sant’Anna, 56127 Pisa, Italy;
- Department of Excellence in Robotics & AI, Scuola Superiore Sant’Anna, 56127 Pisa, Italy
| | - Madina Telkhozhayeva
- Department of Chemistry and Institute of Nanotechnology, Bar-Ilan University, Ramat Gan 52900, Israel; (M.T.); (E.T.); (A.Y.); (E.S.A.); (R.K.); (G.D.N.)
| | - Eti Teblum
- Department of Chemistry and Institute of Nanotechnology, Bar-Ilan University, Ramat Gan 52900, Israel; (M.T.); (E.T.); (A.Y.); (E.S.A.); (R.K.); (G.D.N.)
| | - Alina Yarmolenko
- Department of Chemistry and Institute of Nanotechnology, Bar-Ilan University, Ramat Gan 52900, Israel; (M.T.); (E.T.); (A.Y.); (E.S.A.); (R.K.); (G.D.N.)
| | - Efrat Shawat Avraham
- Department of Chemistry and Institute of Nanotechnology, Bar-Ilan University, Ramat Gan 52900, Israel; (M.T.); (E.T.); (A.Y.); (E.S.A.); (R.K.); (G.D.N.)
| | - Rajashree Konar
- Department of Chemistry and Institute of Nanotechnology, Bar-Ilan University, Ramat Gan 52900, Israel; (M.T.); (E.T.); (A.Y.); (E.S.A.); (R.K.); (G.D.N.)
| | - Gilbert Daniel Nessim
- Department of Chemistry and Institute of Nanotechnology, Bar-Ilan University, Ramat Gan 52900, Israel; (M.T.); (E.T.); (A.Y.); (E.S.A.); (R.K.); (G.D.N.)
| | - Leonardo Ricotti
- The BioRobotics Institute, Scuola Superiore Sant’Anna, 56127 Pisa, Italy;
- Department of Excellence in Robotics & AI, Scuola Superiore Sant’Anna, 56127 Pisa, Italy
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4
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Ramezanpour A, Karami K, Kharaziha M, Silvestru C, Bayat P. Synthesis and characterization of the ternary graphene oxide, MnFe
2
O
4
nanoparticles, and Polyamidoamine dendrons nanocomposite decorated with palladium as a heterogeneous catalyst for nitroaromatics reduction. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6329] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Azar Ramezanpour
- Department of Chemistry Isfahan University of Technology Isfahan Iran
| | - Kazem Karami
- Department of Chemistry Isfahan University of Technology Isfahan Iran
| | - Mahshid Kharaziha
- Department of Materials Engineering Isfahan University of Technology Isfahan Iran
| | - Cristian Silvestru
- Supramolecular Organic and Organometallic Chemistry Centre, Department of Chemistry, Faculty of Chemistry and Chemical Engineering Babeş‐Bolyai University Cluj‐Napoca Romania
| | - Parvaneh Bayat
- Department of Chemistry Isfahan University of Technology Isfahan Iran
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5
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Serrano-Luján L, Víctor-Román S, Toledo C, Sanahuja-Parejo O, Mansour AE, Abad J, Amassian A, Benito AM, Maser WK, Urbina A. Environmental impact of the production of graphene oxide and reduced graphene oxide. SN APPLIED SCIENCES 2019. [DOI: 10.1007/s42452-019-0193-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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6
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Wu Y, Wang F, Wang S, Ma J, Xu M, Gao M, Liu R, Chen W, Liu S. Reduction of graphene oxide alters its cyto-compatibility towards primary and immortalized macrophages. NANOSCALE 2018; 10:14637-14650. [PMID: 30028471 DOI: 10.1039/c8nr02798f] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Graphene oxide (GO) and its derivatives (e.g., reduced graphene oxide, RGO) have shown great promise in biomedicine. Although many studies have been conducted to understand the relative cyto-compatibility between GO and RGO materials, the results are inconclusive and controversial. In this study, we compared the biocompatibility aspects (e.g. cytotoxicity, pro-inflammatory effects and impairment of cellular morphology) between parental and reduced GOs towards macrophages using primary bone marrow-derived macrophages (BMDMs) and J774A.1 cell line. Two RGOs (RGO1 and RGO2) with differential reduction levels relative to the parental GO were prepared. Intriguingly, besides loss of oxygen-containing functional groups, significant morphological alteration of GO occurred, from the sheet-like structure to a polygonal curled shape for RGO, without significant aggregation in biological medium. Cytotoxicity assessment unveiled that the RGOs were more toxic than pristine GO to both types of cells. It was surprising to find for the first time (to our knowledge) that GO and RGOs elicited different effects on the morphological changes of BMDMs, as reflected by elongated protrusions from GO treatment and shortened protrusions from the RGOs. Furthermore, RGOs induced greater pro-inflammatory responses than GO, especially in BMDMs. Compromised cyto-compatibility of RGOs was attributable (at least partially) to their greater oxidative stress in macrophages. Mechanistically, these differences in bio-reactivities between GO and RGO should be boiled down to (at least in part) the synergistic effects from the variation of oxygen-containing functional groups and the distinct morphology in between. This study unearthed the crucial contribution of reduction-mediated detrimental cellular effects between GO and RGO towards macrophages.
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Affiliation(s)
- Yakun Wu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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7
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Mahanta A, Raul PK, Saikia S, Bora U, Thakur AJ. Methanol aided synthesis of PdNPs decorated on montmorillonite K 10 and its implication in Suzuki Miyaura type cross coupling reaction under base free condition. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.4192] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Abhijit Mahanta
- Department of Chemical SciencesTezpur University (A central University) Tezpur Napaam 784028 Assam India
| | - Prasanta Kumar Raul
- Department of Chemical SciencesTezpur University (A central University) Tezpur Napaam 784028 Assam India
| | - Sanjib Saikia
- Department of Chemical SciencesTezpur University (A central University) Tezpur Napaam 784028 Assam India
| | - Utpal Bora
- Department of Chemical SciencesTezpur University (A central University) Tezpur Napaam 784028 Assam India
| | - Ashim Jyoti Thakur
- Department of Chemical SciencesTezpur University (A central University) Tezpur Napaam 784028 Assam India
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8
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Bhaskar R, Joshi H, Sharma AK, Singh AK. Reusable Catalyst for Transfer Hydrogenation of Aldehydes and Ketones Designed by Anchoring Palladium as Nanoparticles on Graphene Oxide Functionalized with Selenated Amine. ACS APPLIED MATERIALS & INTERFACES 2017; 9:2223-2231. [PMID: 28048937 DOI: 10.1021/acsami.6b10457] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The treatment of graphene oxide with ClCH2COOH, thionyl chloride, and 2-(phenylselenyl)ethylamine successively has resulted in functionalization of its surface with selenated ethylamine molecules which may act as chelating (Se, N) ligands. The graphene oxide grafted with (Se, N) donor sites (GO-Se) on treatment with Na2PdCl4 and NaOH gave GO-Se anchored with Pd(0) nanoparticles (NPs) (GO-Se-Pd). The X-ray diffraction (powder), FT-IR, XPS, Raman spectroscopy, thermogravimetric analysis (TGA), and electron microscopic techniques (SEM and HR-TEM) authenticated the formation of GO-Se-Pd. The distribution of Pd(0) NPs of size ∼1-3 nm on GO-Se was found nearly uniform. The transfer hydrogenation of carbonyl compounds (aldehydes/ketones) with 2-propanol was catalyzed with GO-Se-Pd. The catalyst equivalent to 0.25 mol % of Pd was sufficient to convert aldehydes and ketones to alcohols in good yield (nearly quantitative for some substrates) and found somewhat more efficient for aldehydes than ketones. The reusability of GO-Se-Pd studied for transfer hydrogenation of 4-anisaldehyde to the corresponding alcohol can be understood by ∼96% conversion even in the sixth catalytic run. Flame AAS analysis of GO-Se-Pd revealed negligible leaching of Pd even after the sixth catalytic reaction cycle. Hot filtration experiments suggested the heterogeneous nature of the catalyst.
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Affiliation(s)
- Renu Bhaskar
- Department of Chemistry, Indian Institute of Technology, Delhi , New Delhi - 110016, India
| | - Hemant Joshi
- Department of Chemistry, Indian Institute of Technology, Delhi , New Delhi - 110016, India
| | - Alpesh K Sharma
- Department of Chemistry, Indian Institute of Technology, Delhi , New Delhi - 110016, India
| | - Ajai K Singh
- Department of Chemistry, Indian Institute of Technology, Delhi , New Delhi - 110016, India
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9
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Hashemi Fath R, Hoseini SJ. Covalently cyclopalladium(II) complex/reduced-graphene oxide as the effective catalyst for the Suzuki–Miyaura reaction at room temperature. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2016.11.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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11
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Navalon S, Dhakshinamoorthy A, Alvaro M, Garcia H. Metal nanoparticles supported on two-dimensional graphenes as heterogeneous catalysts. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2015.12.005] [Citation(s) in RCA: 232] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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12
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Wang Y, Rong Z, Wang Y, Qu J. Ruthenium nanoparticles loaded on functionalized graphene for liquid-phase hydrogenation of fine chemicals: Comparison with carbon nanotube. J Catal 2016. [DOI: 10.1016/j.jcat.2015.10.021] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Sun C, Deng N, An H, Cui H, Zhai J. Electrocatalytic reduction of bromate based on Pd nanoparticles uniformly anchored on polyaniline/SBA-15. CHEMOSPHERE 2015; 141:243-249. [PMID: 26277081 DOI: 10.1016/j.chemosphere.2015.08.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 08/05/2015] [Indexed: 06/04/2023]
Abstract
A nano-composite electrocatalyst of Pd nanoparticles (Pd-NPs) anchored on polyaniline (PANI) supported by mesoporous SBA-15 (Pd-NPs/PANI/SBA-15), was synthesized using an in situ chemical method. Transmission electron microscopy showed that the Pd-NPs were homogeneously dispersed. Fourier-transform infrared and X-ray photoelectron spectroscopies confirmed that the Pd-NPs in the metallic state (Pd(0)) were predominantly immobilized on nitrogen sites in the PANI chains. The electrochemical performance of Pd-NPs/PANI/SBA-15 for electrocatalytic reduction of bromate (BrO3(-)) in an acidic medium was investigated by cyclic voltammetry (CV) and amperometric measurement. The reduction peak in the CV curves in the region 0.12 to -0.22V (vs. SCE) corresponded to response of BrO3(-) electroreduction, and the reduction peak current was well fitted linearly to the BrO3(-) concentration. It is proposed that the bromate ions diffuse to the Pd-NPs active sites and then the electrocatalytic reduction occurred with the H(+) doped in PANI. Furthermore, by amperometric measurement, Pd-NPs/PANI/SBA-15 showed relatively high sensitivity with respect to BrO3(-) concentration in the range of 8μmolL(-1) to 40mmolL(-1). Continuous CV for 200 cycles proved that Pd-NPs/PANI/SBA-15 had excellent electrocatalytic stability. These results show that Pd-NPs/PANI/SBA-15 is effective for electrocatalytic reduction of BrO3(-) and has great potential for the fabrication of BrO3(-) electrochemical sensor.
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Affiliation(s)
- Chencheng Sun
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR China
| | - Ning Deng
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR China
| | - Hao An
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR China
| | - Hao Cui
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR China.
| | - Jianping Zhai
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, PR China
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Wei Z, Pan R, Hou Y, Yang Y, Liu Y. Graphene-supported Pd catalyst for highly selective hydrogenation of resorcinol to 1, 3-cyclohexanedione through giant π-conjugate interactions. Sci Rep 2015; 5:15664. [PMID: 26494123 PMCID: PMC4616164 DOI: 10.1038/srep15664] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 09/29/2015] [Indexed: 02/02/2023] Open
Abstract
The selective hydrogenation of resorcinol (RES) to 1, 3-cyclohexanedione (1,3-CHD) without the addition of alkali is a big challenge. In this article, a novel reduced graphene oxide (rGO) supported Pd catalyst was prepared through co-reduction method, over which we obtained 99.9% of resorcinol conversion and 94.2% of the ever-reported highest 1,3-cyclohexanedione selectivity at 25 °C in only CH2Cl2 solvent. The excellent selectivity was contributed to the strong π-π and p-π interactions between the graphene nanosheet and the benzene ring as well as hydroxyl in RES molecule. The followed adsorption experiment and Raman analysis also showed the existence of aromatic graphite structures in rGO, which exhibited stronger adsorption towards RES than towards 1,3-CHD.
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Affiliation(s)
- Zuojun Wei
- Key Laboratory of Biomass Chemical Engineering of the Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Ruofei Pan
- Key Laboratory of Biomass Chemical Engineering of the Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yaxin Hou
- Key Laboratory of Biomass Chemical Engineering of the Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yao Yang
- Key Laboratory of Biomass Chemical Engineering of the Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yingxin Liu
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310032, China
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15
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Tourani S, Rashidi AM, Safekordi AA, Aghabozorg HR, Khorasheh F. Synthesis of Reduced Graphene Oxide-Carbon Nanotubes (rGO–CNT) Composite and Its Use As a Novel Catalyst Support for Hydro-Purification of Crude Terephthalic Acid. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b01574] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- S. Tourani
- Faculty of Engineering, Islamic Azad University, Science and Research Branch, Tehran, Iran
| | - A. M. Rashidi
- Nanotechnology
Research Center, Research Institute of the Petroleum Industry, Tehran, Iran
| | - A. A. Safekordi
- Faculty of Engineering, Islamic Azad University, Science and Research Branch, Tehran, Iran
| | - H. R. Aghabozorg
- Catalysis
Department, Research Institute of the Petroleum Industry, Tehran, Iran
| | - F. Khorasheh
- Department
of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
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Pan H, Low S, Weerasuriya N, Shon YS. Graphene oxide-promoted reshaping and coarsening of gold nanorods and nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2015; 7:3406-13. [PMID: 25611371 PMCID: PMC4423762 DOI: 10.1021/am508801e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
This paper describes thermally induced reshaping and coarsening behaviors of gold nanorods and nanoparticles immobilized on the surface of graphene oxide. Cetyltrimethylammonium bromide-stabilized gold nanorods with an aspect ratio of ∼3.5 (54:15 nm) and glutathione-capped gold nanoparticles with an average core size of ∼3 nm were synthesized and self-assembled onto the surface of graphene oxide. The hybrid materials were then heated at different temperatures ranging from 50 to 300 °C. The effects of heat treatments were monitored using UV-vis spectroscopy and transmission electron microscopy (TEM). These results were directly compared with those of heat-treated free-standing gold nanorods and nanoparticles without graphene oxide to understand the heat-induced morphological changes of the nanohybrids. The obtained results showed that the gold nanorods would undergo a complete reshaping to spherical particles at the temperature of 50 °C when they are assembled on graphene oxide. In comparison, the complete reshaping of free-standing gold nanorods to spherical particles would ultimately require a heating of the samples at 200 °C. In addition, the spherical gold nanoparticles immobilized on graphene oxide would undergo a rapid coarsening at the temperature of 100-150 °C, which was lower than the temperature (150-200 °C) required for visible coarsening of free-standing gold nanoparticles. The results indicated that graphene oxide facilitates the reshaping and coarsening of gold nanorods and nanoparticles, respectively, during the heat treatments. The stripping and spillover of stabilizing ligands promoted by graphene oxide are proposed to be the main mechanism for the enhancements in the heat-induced transformations of nanohybrids.
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Affiliation(s)
- Hanqing Pan
- Department of Chemistry and Biochemistry, California State University, Long Beach , 1250 Bellflower Boulevard, Long Beach, California 90840, United States
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17
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Cheng Y, Fan Y, Pei Y, Qiao M. Graphene-supported metal/metal oxide nanohybrids: synthesis and applications in heterogeneous catalysis. Catal Sci Technol 2015. [DOI: 10.1039/c5cy00630a] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This minireview outlines recent advances in the design and catalytic applications of graphene-supported metal/metal oxide nanohybrids.
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Affiliation(s)
- Yi Cheng
- Collaborative Innovation Center of Chemistry for Energy Materials
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials
- Fudan University
- Shanghai 200433
- China
| | - Yiqiu Fan
- Collaborative Innovation Center of Chemistry for Energy Materials
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials
- Fudan University
- Shanghai 200433
- China
| | - Yan Pei
- Collaborative Innovation Center of Chemistry for Energy Materials
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials
- Fudan University
- Shanghai 200433
- China
| | - Minghua Qiao
- Collaborative Innovation Center of Chemistry for Energy Materials
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials
- Fudan University
- Shanghai 200433
- China
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