1
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Wang X, Li J, Xing J, Zhang M, Liao R, Wang C, Hua Y, Ji H. Novel synergistically effects of palladium-iron bimetal and manganese carbonate carrier for catalytic oxidation of formaldehyde at room temperature. J Colloid Interface Sci 2023; 656:104-115. [PMID: 37984166 DOI: 10.1016/j.jcis.2023.11.095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 11/10/2023] [Accepted: 11/16/2023] [Indexed: 11/22/2023]
Abstract
The elimination of formaldehyde at room temperature holds immense potential for various applications, and the incorporation of a catalyst rich in surface hydroxyl groups and oxygen significantly enhances its catalytic activity towards formaldehyde oxidation. By employing a coprecipitation method, we successfully achieved a palladium domain confined within the manganese carbonate lattice and doped with iron. This synergistic effect between highly dispersed palladium and iron greatly amplifies the concentration of surface hydroxyl groups and oxygen on the catalyst, thereby enabling complete oxidation of formaldehyde at ambient conditions. The proposed method facilitates the formation of domain-limited palladium within the MnCO3 lattice, thereby enhancing the dispersion of palladium and facilitating its partial incorporation into the MnCO3 lattice. Consequently, this approach promotes increased exposure of active sites and enhances the catalyst's capacity for oxygen activation. The co-doping of iron effectively splits the doping sites of palladium to further enhance its dispersion, while simultaneously modifying the electronic modification of the catalyst to alter formaldehyde's adsorption strength on it. Manganese carbonate exhibits superior adsorption capability for activated surface hydroxyl groups due to the presence of carbonate. In situ infrared testing revealed that dioxymethylene and formate are primary products resulting from catalytic oxidation of formaldehyde, with catalyst surface oxygen and hydroxyl groups playing a crucial role in intermediate product decomposition and oxidation. This study provides novel insights for designing palladium-based catalysts.
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Affiliation(s)
- Xuyu Wang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China; Huizhou Research Institute of Sun Yat-sen University, Huizhou, Guangdong, China; School of Chemistry and Chemical Engineering, the Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province, Hainan Normal University, Haikou, China.
| | - Jing Li
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China
| | - Jiajun Xing
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China
| | - Manyu Zhang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China
| | - Rui Liao
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China
| | - Chongtai Wang
- School of Chemistry and Chemical Engineering, the Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province, Hainan Normal University, Haikou, China
| | - Yingjie Hua
- School of Chemistry and Chemical Engineering, the Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province, Hainan Normal University, Haikou, China
| | - Hongbing Ji
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China; State Key Laboratory Breeding Base of Green-Chemical SynthesisTechnology, Institute of Green Petroleum Processing and Light Hydrocarbon Conversion, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, China; Huizhou Research Institute of Sun Yat-sen University, Huizhou, Guangdong, China; Guangdong Longhu Sci.&Tech. Company Limited, Shantou, China; Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, China.
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2
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Kalita B, Iraqui S, Borgohain X, Rashid MH. Ultrasonic irradiation-assisted MnFe 2O 4 nanoparticles catalyzed solvent-free selective oxidation of benzyl alcohol to benzaldehyde at room temperature. RSC Adv 2023; 13:30855-30868. [PMID: 37869381 PMCID: PMC10587744 DOI: 10.1039/d3ra03797e] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 10/13/2023] [Indexed: 10/24/2023] Open
Abstract
Magnetic nanoparticles (NPs) play a vital role in heterogeneous catalysis because of their easy separation, and effective recyclability. Herein, we report the synthesis of MnFe2O4 NPs for use as catalysts in the selective oxidation of benzyl alcohol to benzaldehyde under mild conditions. The MnFe2O4 NPs have been synthesized by precipitation method followed by hydrothermal ageing at 180 °C for 4.0 h. We have investigated the effect of chitosan and carboxymethyl cellulose on the size or morphology of the formed MnFe2O4 NPs. The X-ray diffraction study confirms the formation of pure and crystalline MnFe2O4 with varying average crystallite sizes ranging from 18 to 28 nm based on the type of additive used. The electron microscopy study reveals that the additive plays a significant role in controlling the morphology of the formed MnFe2O4 NPs. These MnFe2O4 NPs exhibit superparamagnetic behaviour at room temperature and can effectively catalyze the solvent-free selective oxidation of benzyl alcohol to benzaldehyde in the presence of tert-butyl hydroperoxide at room temperature under ultrasonic irradiation. The developed protocol can be extended to various substituted benzyl alcohols having both the electron withdrawing and electron donating groups to afford moderate to excellent yield of the products. The catalyst is magnetically retrievable, highly stable, and can be reused up to the sixth run without significant loss of catalytic activity.
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Affiliation(s)
- Babul Kalita
- Department of Chemistry, Rajiv Gandhi University Rono Hills, Doimukh 791 112 Arunachal Pradesh India
| | - Saddam Iraqui
- Department of Chemistry, Rajiv Gandhi University Rono Hills, Doimukh 791 112 Arunachal Pradesh India
| | - Xavy Borgohain
- Department of Chemistry, Rajiv Gandhi University Rono Hills, Doimukh 791 112 Arunachal Pradesh India
| | - Md Harunar Rashid
- Department of Chemistry, Rajiv Gandhi University Rono Hills, Doimukh 791 112 Arunachal Pradesh India
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3
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Liu L, Zhou X, Xin C, Zhang B, Zhang G, Li S, Liu L, Tai X. Efficient oxidation of benzyl alcohol into benzaldehyde catalyzed by graphene oxide and reduced graphene oxide supported bimetallic Au-Sn catalysts. RSC Adv 2023; 13:23648-23658. [PMID: 37555092 PMCID: PMC10404934 DOI: 10.1039/d3ra03496h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 07/26/2023] [Indexed: 08/10/2023] Open
Abstract
A series of bimetallic and monometallic catalysts comprising Au and Sn nanoparticles loaded on graphene oxide (GO) and reduced graphene oxide (rGO) were prepared using three distinct techniques: two-step immobilization, co-immobilization, and immobilization. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy dispersive X-ray (EDX), and Inductively-coupled plasma optical emission spectroscopy (ICP-OES) were used to characterize the chemical and physical properties of prepared Au-Sn bimetallic and Au or Sn monometallic nanocatalysts. The catalytic performance of the prepared nanocatalysts was evaluated in the selective oxidation of benzyl alcohol (BzOH) to benzaldehyde (BzH) using O2 as an oxidizing agent under moderate conditions. To obtain the optimal BzH yield, the experimental conditions and parameters, including the effects of the reaction time, temperature, pressure, and solvent type on BzOH oxidation, were optimized. Under optimal reaction conditions, bimetallic Au-Sn nanoparticles supported on GO (AuSn/GO-TS, 49.3%) produced a greater yield of BzH than the AuSn/rGO-TS catalysts (35.5%). The Au-Sn bimetallic catalysts were more active than the monometallic catalysts. AuSn/GO-TS and AuSn/rGO-TS prepared by the two-step immobilization method were more active than AuSn/GO-CoIM and AuSn/rGO-CoIM prepared by co-immobilization. In addition, the AuSn/GO-TS and AuSn/rGO-TS catalysts were easily separated from the mixture by centrifugation and reused at least four times without reducing the yield of BzH. These properties make Au-Sn bimetallic nanoparticles supported on GO and rGO particularly attractive for the environmentally friendly synthesis of benzaldehyde.
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Affiliation(s)
- Lili Liu
- School of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University Weifang 261061 China
| | - Xiaojing Zhou
- School of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University Weifang 261061 China
| | - Chunling Xin
- School of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University Weifang 261061 China
| | - Baoli Zhang
- School of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University Weifang 261061 China
| | - Guangman Zhang
- School of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University Weifang 261061 China
| | - Shanshan Li
- School of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University Weifang 261061 China
| | - Li Liu
- School of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University Weifang 261061 China
| | - Xishi Tai
- School of Chemistry & Chemical Engineering and Environmental Engineering, Weifang University Weifang 261061 China
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4
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Sathya V, Jagatheesan R, Gopi D, Sambathkumar S. A simple salt mediated electrooxidative method for the synthesis of benzaldehydes from benzyl alcohols. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2022.2081812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- V. Sathya
- Department of Chemistry, Periyar University, Salem, Tamil Nadu, India
| | - R. Jagatheesan
- Department of Chemistry, Vivekanandha College of Arts and Sciences for Women (Autonomous), Namakkal, Tamil Nadu, India
| | - D. Gopi
- Department of Chemistry, Periyar University, Salem, Tamil Nadu, India
| | - S. Sambathkumar
- Department of Chemistry, Vivekanandha College of Arts and Sciences for Women (Autonomous), Namakkal, Tamil Nadu, India
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5
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Chen T, Yang C, Hu X, Zhang Q, Cai A, Liu H, Li Y, Peng W, Zhang F, Fan X. Boosting the Zn-ion energy storage capability of graphene sandwiched nanoporous VO x derived from MXene. NANOSCALE 2022; 14:8640-8648. [PMID: 35667122 DOI: 10.1039/d2nr01497a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Aqueous rechargeable zinc-ion batteries (ZIBs) are emerging in grid energy storage due to zinc abundance and intrinsic safety. However, developing suitable cathode materials with satisfactory stability and rate capacity remains a great challenge. Herein, a structure of layered MXene derived nanoporous VOx wrapped with graphene nanosheets (rGO-VOx) is constructed as a cathode for ZIBs. The incorporation of two typical 2D materials imparts composites with shortened diffusion pathways and increased electrical conductivity. Thus, the rGO-VOx cathode exhibits a remarkable rate capability of 196 mA h g-1 at 8 A g-1 and long-term stability with 90% retention after over 1200 cycles at 5 A g-1 in an aqueous coin cell. The Zn storage mechanism is also systematically investigated. The layered V2O5 transforms into layered ZnxV2O5·nH2O with larger interspacing upon cycling. NaV6O15 and the in situ formed ZnxV2O5·nH2O co-contribute to the subsequent insertion and extraction process.
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Affiliation(s)
- Tao Chen
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300072, China.
| | - Changyu Yang
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300072, China.
| | - Xuewen Hu
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300072, China.
| | - Qicheng Zhang
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300072, China.
| | - An Cai
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300072, China.
| | - Huibin Liu
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300072, China.
| | - Yang Li
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300072, China.
| | - Wenchao Peng
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300072, China.
| | - Fengbao Zhang
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300072, China.
| | - Xiaobin Fan
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin, 300072, China.
- Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
- Institute of Shaoxing, Tianjin University, Zhejiang 312300, China
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6
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Graphene Oxide-Reinforced Alginate Hydrogel for Controlled Release of Local Anesthetics: Synthesis, Characterization, and Release Studies. Gels 2022; 8:gels8040246. [PMID: 35448147 PMCID: PMC9026710 DOI: 10.3390/gels8040246] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 04/13/2022] [Accepted: 04/14/2022] [Indexed: 12/17/2022] Open
Abstract
In pain relief, lidocaine has gained more attention as a local anesthetic. However, there are several side effects that limit the use of local anesthetics. Therefore, it is hypothesized that a hydrogel system with facile design can be used for prolonged release of lidocaine. In this study, we developed a formulation comprises of sodium alginate (SA) and graphene oxide (GO) to prolong the release of lidocaine. The gelation was induced by physically crosslinking the alginate with Ca2+ ions. The formation of blank SA and GO-reinforced SA hydrogels was investigated with different concentration of Ca2+ ions. The controlled release of lidocaine hydrochloride (LH) on both hydrogel systems was studied in PBS solution. The GO-reinforced SA hydrogels exhibited more sustained release than SA hydrogels without GO. In vitro biocompatibility test in L929 fibroblast cells confirmed the non-toxic property of hydrogels. Furthermore, to prove the in-situ gelation and biodegradability of hydrogels the hydrogels were injected on mice model and confirmed the stable gel formation. The hydrogels implanted onto the subcutaneous tissue of hydrogels retained over one week. These results indicate that LH-loaded GO-reinforced SA hydrogel can be a potential biomaterial for controlled release of local anesthetics.
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7
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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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8
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Oswal P, Arora A, Singh S, Nautiyal D, Kumar S, Kumar A. Functionalization of graphene oxide with a hybrid P, N ligand for immobilizing and stabilizing economical and non-toxic nanosized CuO: an efficient, robust and reusable catalyst for the C–O coupling reaction in O-arylation of phenol. NEW J CHEM 2022. [DOI: 10.1039/d1nj05273j] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A new graphene oxide based heterogeneous catalytic system holding CuO nanoparticles through P and N donor sites for the C–O coupling reaction.
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Affiliation(s)
- Preeti Oswal
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, India
| | - Aayushi Arora
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, India
| | - Siddhant Singh
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, India
| | - Divyanshu Nautiyal
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, India
| | - Sushil Kumar
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, India
| | - Arun Kumar
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, India
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9
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Adil SF, Shaik MR, Nasr FA, Alqahtani AS, Ahmed MZ, Qamar W, Kuniyil M, Almutairi A, Alwarthan A, Siddiqui MR, Hatshan MR, Khan M. Enhanced Apoptosis by Functionalized Highly Reduced Graphene Oxide and Gold Nanocomposites in MCF-7 Breast Cancer Cells. ACS OMEGA 2021; 6:15147-15155. [PMID: 34151094 PMCID: PMC8210402 DOI: 10.1021/acsomega.1c01377] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 05/25/2021] [Indexed: 05/27/2023]
Abstract
Graphene nanocomposites have gained significant interest in a variety of biological applications due to their unique properties. Herein, we have studied the apoptosis-inducing ability and anticancer properties of functionalized highly reduced graphene oxide (HRG) and gold nanoparticles (Au NPs)-based nanocomposites (AP-HRG-Au). Samples were prepared under facile conditions via simple stirring and ultrasonication. All the samples were tested for their anticancer properties against different human cancer cell lines including lung (A549), liver (HepG2), and breast (MCF-7) cancer cells using doxorubicin as a positive control. In order to enhance the solubility and bioavailability of the sample, HRG was functionalized with 1-aminopyrene (1-AP) as a stabilizing ligand. The ligand also facilitated the homogeneous growth of Au NPs on the surface of HRG by offering chemically specific binding sites. The synthesis of nanocomposites and the surface functionalization of HRG were confirmed by UV-Vis, powder X-ray diffraction, and Fourier transform infrared spectroscopy. The structure and morphology of the as-prepared nanocomposites were established by high-resolution transmission electron microscopy. Because of the functionalization, the AP-HRG-Au nanocomposite exhibited enhanced physical stability and high dispersibility. A comparative anticancer study of pristine HRG, nonfunctionalized HRG-Au, and 1-AP-functionalized AP-HRG-Au nanocomposites revealed the enhanced apoptosis ability of functionalized nanocomposites compared to the nonfunctionalized sample, whereas the pristine HRG did not show any anticancer ability against all tested cell lines. Both HRG-Au and AP-HRG-Au have induced a concentration-dependent reduction in cell viability in all tested cell lines after 48 h of exposure, with a significantly higher response in MCF-7 cells compared to the remaining cells. Therefore, MCF-7 cells were selected to perform detailed investigations using apoptosis assay, cell cycle analysis, and reactive oxygen species measurements. These results suggest that AP-HRG-Au induces enhanced apoptosis in human breast cancer cells.
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Affiliation(s)
- Syed Farooq Adil
- Department
of Chemistry, College of Science, King Saud
University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Mohammed Rafi Shaik
- Department
of Chemistry, College of Science, King Saud
University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Fahd A. Nasr
- Medicinal,
Aromatic and Poisonous Plants Research Center, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Ali S. Alqahtani
- Medicinal,
Aromatic and Poisonous Plants Research Center, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
- Department
of Pharmacognosy, College of Pharmacy, King
Saud University, Riyadh 11451, Saudi Arabia
| | - Mohammad Z. Ahmed
- Medicinal,
Aromatic and Poisonous Plants Research Center, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
- Department
of Pharmacognosy, College of Pharmacy, King
Saud University, Riyadh 11451, Saudi Arabia
| | - Wajhul Qamar
- Department
of Pharmacology and Toxicology, Central Laboratory, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Mufsir Kuniyil
- Department
of Chemistry, College of Science, King Saud
University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Adibah Almutairi
- Department
of Chemistry, College of Science, King Saud
University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Abdulrahman Alwarthan
- Department
of Chemistry, College of Science, King Saud
University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Mohammed Rafiq
H. Siddiqui
- Department
of Chemistry, College of Science, King Saud
University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Mohammad Rafe Hatshan
- Department
of Chemistry, College of Science, King Saud
University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Mujeeb Khan
- Department
of Chemistry, College of Science, King Saud
University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
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Selective Catalytic Oxidation of Toluene to Benzaldehyde: Effect of Aging Time and Calcination Temperature Using CuxZnyO Mixed Metal Oxide Nanoparticles. Catalysts 2021. [DOI: 10.3390/catal11030354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Oxidation is an important organic transformation, and several catalysts have been reported for this conversion. In this study, we report the synthesis of mixed metal oxide CuxZnyO, which is prepared by a coprecipitation method by varying the molar ratio of Cu and Zn in the catalytic system. The prepared mixed metal oxide CuxZnyO was evaluated for catalytic performance for toluene oxidation. Various parameters of the catalytic evaluation were studied in order to ascertain the optimum condition for the best catalytic performance. The results indicate that aging time, calcination temperature, reaction temperature, and feed rate influence catalytic performance. It was found that the catalyst interfaces apparently enhanced catalytic activity for toluene oxidation. The XRD diffractograms reveal the crystalline nature of the mixed metal oxide formed and also confirm the coexistence of hexagonal and monoclinic crystalline phases. The catalyst prepared by aging for 4 h and calcined at 450 °C was found to be the best for the conversion of toluene to benzaldehyde while the reactor temperature was maintained at 250 °C with toluene fed into the reactor at 0.01 mL/min. The catalyst was active for about 13 h.
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11
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Iraqui S, Kashyap SS, Rashid MH. NiFe 2O 4 nanoparticles: an efficient and reusable catalyst for the selective oxidation of benzyl alcohol to benzaldehyde under mild conditions. NANOSCALE ADVANCES 2020; 2:5790-5802. [PMID: 36133875 PMCID: PMC9417505 DOI: 10.1039/d0na00591f] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 10/09/2020] [Indexed: 05/04/2023]
Abstract
Benzaldehyde is one of the most important and versatile organic chemicals for industrial applications. This study explores a milder approach for the fabrication of NiFe2O4 nanoparticles (NPs) for use as a catalyst in the selective oxidation of benzyl alcohol to benzaldehyde. A co-precipitation method coupled with hydrothermal aging has been adopted to synthesize NiFe2O4 NPs in the absence of any additive. Different techniques such as electron microscopy, diffractometry, and photoelectron spectroscopy have been used to characterize the products. The results showed that the synthesized NiFe2O4 NPs are spherical, pure, and highly crystalline with sizes below 12 nm possessing superparamagnetic behaviour. The catalytic activity of the synthesized NiFe2O4 NPs has been assessed in the selective oxidation of benzyl alcohol under ambient reaction conditions. A conversion of 85% benzyl alcohol with 100% selectivity has been attained with t-butyl hydroperoxide at 60 °C in 3 h. With the optimized reaction conditions, the generality of the newly developed protocol has been expanded to a wide array of substituted benzyl alcohols with good performance. The NiFe2O4 nanocatalysts are magnetically separable and are reusable up to five cycles without loss of catalytic activity.
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Affiliation(s)
- Saddam Iraqui
- Department of Chemistry, Rajiv Gandhi University Rono Hills Doimukh 791 112 Arunachal Pradesh India
| | | | - Md Harunar Rashid
- Department of Chemistry, Rajiv Gandhi University Rono Hills Doimukh 791 112 Arunachal Pradesh India
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12
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Eco-Friendly and Solvent-Less Mechanochemical Synthesis of ZrO2–MnCO3/N-Doped Graphene Nanocomposites: A Highly Efficacious Catalyst for Base-Free Aerobic Oxidation of Various Types of Alcohols. Catalysts 2020. [DOI: 10.3390/catal10101136] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
In recent years, the development of green mechanochemical processes for the synthesis of new catalysts with higher catalytic efficacy and selectivity has received manifest interest. In continuation of our previous study, in which graphene oxide (GRO) and highly reduced graphene oxide (HRG) based nanocomposites were prepared and assessed, herein, we have explored a facile and solvent-less mechanochemical approach for the synthesis of N-doped graphene (NDG)/mixed metal oxide (MnCO3–ZrO2) ((X%)NDG/MnCO3–ZrO2), as the (X%)NDG/MnCO3–ZrO2 nano-composite was synthesized using physical grinding of separately synthesized NDG and pre-calcined (300 °C) MnCO3–ZrO2 via green milling method. The structures of the prepared materials were characterized in detail using X-ray powder diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive X-Ray Analysis (EDX), Fourier-transform infrared spectroscopy (FTIR), Raman, Thermogravimetric analysis (TGA), and N2 adsorption-desorption isotherm analysis. Besides, the obtained nanocomposites were employed as heterogeneous oxidation catalyst for the alcohol oxidation using green oxidant O2 without involving any surfactants or bases. The reaction factors were systematically studied during the oxidation of benzyl alcohol (PhCH2OH) as the model reactant to benzaldehyde (PhCHO). The NDG/MnCO3–ZrO2 exhibits premium specific activity (66.7 mmol·g−1·h−1) with 100% conversion of PhCH2OH and > 99.9% selectivity to PhCHO after only 6 min. The mechanochemically prepared NDG based nanocomposite exhibited notable improvement in the catalytic efficacy as well as the surface area compared to the pristine MnCO3–ZrO2. Under the optimal circumstances, the NDG/MnCO3–ZrO2 catalyst could selectively catalyze the aerobic oxidation of a broad array of alcohols to carbonyls with full convertibility without over-oxidized side products like acids. The NDG/MnCO3–ZrO2 catalyst were efficiently reused for six subsequent recycling reactions with a marginal decline in performance and selectivity.
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Murugan KP, Balaji M, Kar SS, Swarnalatha S, Sekaran G. Nano fibrous carbon produced from chromium bearing tannery solid waste as the bitumen modifier. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 270:110882. [PMID: 32721321 DOI: 10.1016/j.jenvman.2020.110882] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Revised: 05/01/2020] [Accepted: 05/29/2020] [Indexed: 06/11/2023]
Abstract
Bitumen binders play a major role in reducing the aging and oxidation property of bitumen. Carbon nanomaterials act as an effective bitumen modifier due to its stiffness and strength. Thus, nano fibrous carbon (NFC) was prepared from Chrome Tanned Buffing Dust (a solidwaste generated from leather industries) with proper care of avoiding oxidation of Cr(III) to Cr(VI) through pulse pyrolysis system. Morphology analysis using TEM confirmed the nano fibrous structure of NFC. XRD pattern of NFC depicts the graphitic phases of carbon along with the Cr2O3. Prepared NFC has been used as bitumen modifier and the blending of NFC with bitumen were done using both conventional and microwave heating methods to study the proper blending methods to enhance the bitumen properties. Thermogram of the modified bitumen showed that the decomposition temperature increases by increasing the percentage of NFC (5-25%) in both the heating methods, but comparatively the thermal stability is more in microwave mixing than in conventional mixing. The morphology analysis of the modified bitumen showed that non-uniform blending in conventional type of heating and homogeneously blended mixture in microwave type of heating. The penetration value and ductility decreases while softening point and kinematic viscosity increases by increasing the quantity of NFC from 5 to 25% in modified bitumen. Microwave heat mixing method yielded better modified bitumen with NFC than conventional heating method in terms of stability, uniform blending and physical properties. The non-leachability of the Cr(III) in the NFC modified bitumen was confirmed through total chromium analysis in the leachate. But, chromium analysis in leachate of NFC immersed in acetate buffer for one month showed leaching of Cr(III) 5.5 μg/L in the 25% NFC modified bitumen block mixed using conventional heating method.
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Affiliation(s)
- K Patchai Murugan
- Environmental Science and Engineering Division, CSIR - Central Leather Research Institute, Adyar, Chennai, 600020, Tamilnadu, India
| | - M Balaji
- Environmental Science and Engineering Division, CSIR - Central Leather Research Institute, Adyar, Chennai, 600020, Tamilnadu, India
| | - Siksha Swaroopa Kar
- Flexible Pavement Division, CSIR - Central Road Research Institute, Madura Road, New Delhi, 110025, India
| | - S Swarnalatha
- Environmental Science and Engineering Division, CSIR - Central Leather Research Institute, Adyar, Chennai, 600020, Tamilnadu, India.
| | - G Sekaran
- SRMIST, Ramapuram Campus, Chennai, 600089, Tamilnadu, India.
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Salehiyan R, Nofar M, Malkappa K, Ray SS. Effect of nanofillers characteristics and their selective localization on morphology development and rheological properties of melt‐processed polylactide/poly(butylene adipate‐co‐terephthalate) blend composites. POLYM ENG SCI 2020. [DOI: 10.1002/pen.25505] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Reza Salehiyan
- Centre for Nanostructures and Advanced Materials DSI‐CSIR Nanotechnology Innovation Centre, Council for Scientific and Industrial Research Pretoria South Africa
| | - Mohammadreza Nofar
- Metallurgical and Materials Engineering Department Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University Maslak Turkey
| | - Kuruma Malkappa
- Centre for Nanostructures and Advanced Materials DSI‐CSIR Nanotechnology Innovation Centre, Council for Scientific and Industrial Research Pretoria South Africa
| | - Suprakas Sinha Ray
- Centre for Nanostructures and Advanced Materials DSI‐CSIR Nanotechnology Innovation Centre, Council for Scientific and Industrial Research Pretoria South Africa
- Department of Chemical Sciences University of Johannesburg Johannesburg South Africa
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Synthesis and Characterization of CoxOy–MnCO3 and CoxOy–Mn2O3 Catalysts: A Comparative Catalytic Assessment Towards the Aerial Oxidation of Various Kinds of Alcohols. Processes (Basel) 2020. [DOI: 10.3390/pr8080910] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
CoxOy–manganese carbonate (X%)(CoxOy–MnCO3 catalysts (X = 1–7)) were synthesized via a straightforward co-precipitation strategy followed by calcination at 300 °C. Upon calcination at 500 °C, these were transformed to CoxOy–dimanganese trioxide i.e., (X%)CoxOy–Mn2O3. A relative catalytic evaluation was conducted to compare the catalytic efficiency of the two prepared catalysts for aerial oxidation of benzyl alcohol (BzOH) to benzaldehyde (BzH) using O2 molecule as a clean oxidant without utilizing any additives or alkalis. Amongst the different percentages of doping with CoxOy (0–7% wt./wt.) on MnCO3 support, the (1%)CoxOy–MnCO3 catalyst exhibited the highest catalytic activity. The influence of catalyst loading, calcination temperature, reaction time, and temperature and catalyst dosage was thoroughly assessed to find the optimum conditions of oxidation of benzyl alcohol (BzOH) for getting the highest catalytic efficiency. The (1%)CoxOy–MnCO3 catalyst which calcined at 300 °C displayed the best effectiveness and possessed the largest specific surface area i.e., 108.4 m2/g, which suggested that the calcination process and specific surface area play a vital role in this transformation. A 100% conversion of BzOH along with BzH selectivity >99% was achieved after just 20 min. Notably, the attained specific activity was found to be considerably larger than the previously-reported cobalt-containing catalysts for this transformation. The scope of this oxidation reaction was expanded to various alcohols containing aromatic, aliphatic, allylic, and heterocyclic alcohols without any further oxidation i.e., carboxylic acid formation. The scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and Brunauer–Emmett–Teller (BET) specific surface area analytical techniques were used to characterize the prepared catalysts. The obtained catalyst could be easily regenerated and reused for six consecutive runs without substantial decline in its efficiency.
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Recent advancement in oxidation or acceptorless dehydrogenation of alcohols to valorised products using manganese based catalysts. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213241] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Ye B, Kim SI, Lee M, Ezazi M, Kim HD, Kwon G, Lee DH. Synthesis of oxygen functionalized carbon nanotubes and their application for selective catalytic reduction of NO x with NH 3. RSC Adv 2020; 10:16700-16708. [PMID: 35498861 PMCID: PMC9053095 DOI: 10.1039/d0ra01665a] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 04/19/2020] [Indexed: 11/24/2022] Open
Abstract
Oxygen functionalized carbon nanotubes synthesized by surface acid treatment were used to improve the dispersion properties of active materials for catalysis. Carbon nanotubes have gained attention as a support for active materials due to their high specific surface areas (400-700 m2 g-1) and chemical stability. However, the lack of surface functionality causes poor dispersion of active materials on carbon nanotube supports. In this study, oxygen functional groups were prepared on the surface of carbon nanotubes as anchoring sites for decoration with catalytic nanoparticles. The oxygen functional groups were prepared through a chemical acid treatment using sulfuric acid and nitric acid, and the amount of functional groups was controlled by the reaction time. Vanadium, tungsten, and titanium oxides as catalytic materials were dispersed using an impregnation method on the synthesized carbon nanotube surfaces. Due to the high density of oxygen functional groups, the catalytic nanoparticles were well dispersed and reduced in size on the surface of the carbon nanotube supports. The selective catalytic reduction catalyst with the oxygen functionalized carbon nanotube support exhibited enhanced NO x removal efficiency of over 90% at 350-380 °C which is the general operating temperature range of catalysis in power plants.
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Affiliation(s)
- Bora Ye
- Green Materials & Processes R&D Group, Korea Institute of Industrial Technology Ulsan 44413 Republic of Korea
| | - Sun-I Kim
- Green Materials & Processes R&D Group, Korea Institute of Industrial Technology Ulsan 44413 Republic of Korea
| | - Minwoo Lee
- Small & Medium Class Vessel Convergence Technology Team, Korea Marine Equipment Research Institute Gunsan 54001 Republic of Korea
| | - Mohammadamin Ezazi
- Department of Mechanical Engineering, University of Kansas Lawrence Kansas 66045 USA
| | - Hong-Dae Kim
- Green Materials & Processes R&D Group, Korea Institute of Industrial Technology Ulsan 44413 Republic of Korea
| | - Gibum Kwon
- Department of Mechanical Engineering, University of Kansas Lawrence Kansas 66045 USA
| | - Duck Hyun Lee
- Green Materials & Processes R&D Group, Korea Institute of Industrial Technology Ulsan 44413 Republic of Korea
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Eco-Friendly Mechanochemical Preparation of Ag2O–MnO2/Graphene Oxide Nanocomposite: An Efficient and Reusable Catalyst for the Base-Free, Aerial Oxidation of Alcohols. Catalysts 2020. [DOI: 10.3390/catal10030281] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Recently, the development of eco-friendly mechanochemical approaches for the preparation of novel catalysts with enhanced activity and selectivity has gained considerable attention. Herein, we developed a rapid and solvent-less mechanochemical method for the preparation of mixed metal oxide (Ag2O–MnO2) decorated graphene oxide (GRO)-based nanocomposites (Ag2O–MnO2/(X wt.%)GRO), as the Ag2O–MnO2/(X wt.%)GRO nanocomposite was fabricated by the physical grinding of freshly prepared GRO and pre-annealed (300 °C) mixed metal oxide nanoparticles (NPs) (Ag2O–MnO2) using an eco-friendly milling procedure. The as-prepared nanocatalysts were characterized by using various techniques. Furthermore, the nanocomposites were applied as a heterogeneous catalyst for the oxidation of alcohol by employing gaseous O2 as an eco-friendly oxidant under base-free conditions. The mechanochemically obtained GRO-based composite exhibited noticeable enhancement in the surface area and catalytic performance compared to the pristine Ag2O–MnO2. The results revealed that (1%)Ag2O–MnO2/(5 wt.%)GRO catalyst exhibited higher specific performance (13.3 mmol·g−1·h−1) with a 100% conversion of benzyl alcohol (BnOH) and >99% selectivity towards benzaldehyde (BnH) within 30 min. The enhancement of the activity and selectivity of GRO-based nanocatalyst was attributed to the presence of various oxygen-containing functional groups, a large number of defects, and a high specific surface area of GRO. In addition, the as-prepared nanocatalyst also demonstrated excellent catalytic activity towards the conversion of a variety of other alcohols to respective carbonyls under optimal conditions. Besides, the catalyst ((1%)Ag2O–MnO2/(5 wt.%)GRO) could be efficiently recycled six times with no noticeable loss in its performance and selectivity.
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A Facile Synthesis of ZrOx-MnCO3/Graphene Oxide (GRO) Nanocomposites for the Oxidation of Alcohols using Molecular Oxygen under Base Free Conditions. Catalysts 2019. [DOI: 10.3390/catal9090759] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Graphene and its nanocomposites are showing excellent potential in improving the catalytic performances of different materials. However, the synthetic protocol and its form, such as graphene oxide (GRO) or highly reduced graphene oxide (HRG), influence the catalytic efficiencies. Here, we present, a facile synthesis of graphene oxide (GRO) and ZrOx-MnCO3-based nanocomposites [(1%)ZrOx–MnCO3/(x%)GRO] and their outcome as an oxidation catalyst for alcohol oxidation under mild conditions using O2 as a clean oxidant. The ZrOx–MnCO3/GRO catalyst prepared by incorporating GRO to pre-calcined ZrOx-MnCO3 using ball milling showed remarkable enhancement in the catalytic activities as compared to pristine ZrOx–MnCO3, ZrOx–MnCO3 supported on HRG or ZrOx–MnCO3/GRO prepared by in-situ growth of ZrOx–MnCO3 onto GRO followed by calcination. The catalyst with composition (1%)ZrOx–MnCO3/(1%)GRO exhibited superior specific activity (57.1 mmol/g·h) with complete conversion and >99% selectivity of the product within a short period of time (7 min) and at a relatively lower temperature (100 °C). The catalyst could be recycled at least five times with a negligible decrease in efficiency and selectivity. The catalytic study was extended to different aromatic as well as aliphatic alcohols under optimized conditions, which confirmed the efficiency and selectivity of the catalyst.
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g-C3N4 modified Co3O4 as efficient catalysts for aerobic oxidation of benzyl alcohol. REACTION KINETICS MECHANISMS AND CATALYSIS 2019. [DOI: 10.1007/s11144-019-01627-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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One-Pot Synthesized Pd@N-Doped Graphene: An Efficient Catalyst for Suzuki–Miyaura Couplings. Catalysts 2019. [DOI: 10.3390/catal9050469] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Nitrogen-doped graphene (NDG)-palladium (Pd)-based nanocatalysts (NDG@Pd) can be potentially applied as an efficient catalyst for the preparation of biaryls in a Suzuki–Miyaura coupling reaction. Herein, we report the one-pot facile synthesis of an NDG@Pd nanocatalyst, wherein the nanocatalyst was prepared by the simultaneous reduction of graphene oxide (GRO) and PdCl2 in the presence of hydrazine hydrate as a reducing agent, while ammonium hydroxide was used as a source of “N’’ on the surface of graphene. The as-synthesized NDG@Pd nanocatalyst, consisting of smaller-sized, spherical-shaped palladium nanoparticles (Pd-NPs) on the surface of NDG, was characterized by several spectroscopic and microscopic techniques, including high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), ultraviolet–visible spectroscopy (UV-Vis), Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and Brunauer–Emmett–Teller (BET). The nanocatalyst displayed outstanding catalytic activity in the Suzuki–Miyaura cross-coupling reactions of phenyl halides with phenyl boronic acids under facile conditions in water. The catalytic activity of NDG@Pd was found to be a more efficient catalyst when compared to pristine highly reduced graphene oxide (HRG) based Pd nanocatalyst (HRG@Pd). Furthermore, the reusability of the catalyst was also tested by repeatedly performing the same reaction using the recovered catalyst. The N-doped catalyst displayed excellent reusability even after several reactions.
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Liu D, Qiu C, Li M, Xie Y, Chen L, Lin H, Long J, Zhang Z, Wang X. One-step green conversion of benzyl bromide to aldehydes on NaOH-modified g-C3N4 with dioxygen under LED visible light. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00481e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
NaOH-modified g-C3N4 facilitates a green and sustainable route for the oxidation of benzyl bromide to benzaldehyde with 99% conversion.
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Affiliation(s)
- Dan Liu
- Research Institute of Photocatalysis
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou 350116
| | - Chengwei Qiu
- Research Institute of Photocatalysis
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou 350116
| | - Minbo Li
- Research Institute of Photocatalysis
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou 350116
| | - Yanyu Xie
- Research Institute of Photocatalysis
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou 350116
| | - Lu Chen
- Research Institute of Photocatalysis
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou 350116
| | - Huaxiang Lin
- Research Institute of Photocatalysis
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou 350116
| | - Jinlin Long
- Research Institute of Photocatalysis
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou 350116
| | - Zizhong Zhang
- Research Institute of Photocatalysis
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou 350116
| | - Xuxu Wang
- Research Institute of Photocatalysis
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou 350116
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Zare Hosseinzadeh S, Babazadeh M, Shahverdizadeh GH, Hosseinzadeh-Khanmiri R. Direct oxidative esterification of primary alcohols and oxidation of secondary alcohols over mesoporous spherical silica encapsulated MnO 2nanoparticles. NEW J CHEM 2019. [DOI: 10.1039/c9nj01345h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
In this work, a simple and efficient strategy for the fabrication of novel encapsulated MnO2nanoparticles inside spherical mesoporous silica hollow-nanoparticles was described.
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Ramalingam V, Raja S, Sundaramahalingam S, Rajaram R. Chemical fabrication of graphene oxide nanosheets attenuates biofilm formation of human clinical pathogens. Bioorg Chem 2018; 83:326-335. [PMID: 30396117 DOI: 10.1016/j.bioorg.2018.10.052] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 10/03/2018] [Accepted: 10/26/2018] [Indexed: 11/17/2022]
Abstract
Graphene oxide (GO) has been recently attracted considerable interest for its potential applications in physical, chemical and biological properties. In the present study, the GO nanosheets were prepared by a chemical exfoliation technique using a modified Hummers method. Initially, the prepared GO nanosheets were confirmed by UV-vis spectroscopy and further characterized by FE-SEM, Edax, HR-TEM and SAED that demonstrated the formation of GO nanosheets with few layers flat sheet structure with hexagonal lattice crystalline nature. The FTIR spectra revealed the presence of various oxygen containing functional groups has been produced from graphite plane by exfoliation technique. The prepared GO nanosheets showed excellent antibiotic resistant activity against planktonic bacteria and more effective to damage the established biofilms and inhibits the biofilm formation of human clinical pathogens like E. coli and P. aeruginosa. Further, the GO nanosheets were found to be non-toxic to normal mammalian cells and there are no apparent morphological changes were observed in control and treated cells. In conclusion, GO nanosheets were effectively preventing the formation of biofilms and kills the represent bacteria that suggested the GO nanosheets could be used for the prevention and treatment of biofilm-related infections.
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Affiliation(s)
- Vaikundamoorthy Ramalingam
- DNA Barcoding and Marine Genomics Laboratory, Department of Marine Science, Bharathidasan University, Tiruchirappalli, Tamil Nadu, India
| | - Sakthivel Raja
- Crystal Growth and Thin Film Laboratory, Department of Physics, Bharathidasan University, Tiruchirappalli, Tamil Nadu, India
| | - Subramaniam Sundaramahalingam
- Department of Electrical and Electronics Engineering, Mepco Schlenk Engineering College, Sivakasi, Tamil Nadu, India
| | - Rajendran Rajaram
- DNA Barcoding and Marine Genomics Laboratory, Department of Marine Science, Bharathidasan University, Tiruchirappalli, Tamil Nadu, India.
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Ag2O Nanoparticles-Doped Manganese Immobilized on Graphene Nanocomposites for Aerial Oxidation of Secondary Alcohols. METALS 2018. [DOI: 10.3390/met8060468] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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