Ag nanoparticles immobilized on new mesoporous triazine-based carbon (MTC) as green and recoverable catalyst for reduction of nitroaromatic in aqueous media

Abstract In this research, we reported an effective method for the synthesis of a new mesoporous triazine-based carbon (MTC) substrate and its application as the green and recoverable catalyst in the synthesis of organic compounds. The porous carbon acted as a substrate for silver active species after its surface modification by chloroacetonitrile (Ag@MTC). The Ag@MTC nanocatalyst was characterized by several techniques namely, Fourier-transform infrared spectroscopy, field emission scanning electron microscopy with energy dispersive spectroscopy, X-ray diffraction, transmission electron microscopy, Brunauer–Emmett–Teller surface area analysis, and inductively coupled plasma. The Ag@MTC catalyst was applied for the reduction of nitroaromatic compounds in aqueous media by using NaBH4 (reducing agent) at room temperature. This nanocatalyst can be readily recovered and recycled for at least nine runs without a notable decrease in its efficiency. Catalytic efficiency studies exhibited that Ag@MTC nanocatalyst had good activity towards reduction reactions.

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The nature and origin of non-marine 10 Å clay from the Late Eocene and Early Oligocene of the Isle of Wight (Hampshire Basin), UK

Clay Minerals ◽

10.1180/000985501750539526 ◽

2001 ◽

Vol 36 (3) ◽

pp. 447-464 ◽

Cited By ~ 16

Author(s):

J. M. Huggett ◽

A. S. Gale ◽

N. Clauer

Keyword(s):

Electron Microscopy ◽

Inductively Coupled Plasma ◽

Late Eocene ◽

X Ray Diffraction ◽

Wetting And Drying ◽

Wet Chemistry ◽

X Ray ◽

Inductively Coupled ◽

Early Oligocene ◽

Transmission Electron

AbstractVariegated palaeosols, which formed from weathering of clays, silts and brackish to freshwater limestones, are present in the Late Eocene–Early Oligocene Solent Group of the Hampshire Basin, southern UK. The composition and origin of the clay in three segments of the lower part of the Solent Group have been investigated by X-ray diffraction, microprobe analysis, inductively coupled plasma-mas spectrometry, K/Ar dating, high resolution scanning electron microscopy, analytical transmission electron microscopy and wet chemistry. The detrital clay mineral suite is dominated by illite and smectite with minor kaolinite and chlorite. Seasonal wetting and drying in gley soils has resulted in replacement of smectite by Fe-rich, or illite-rich illitesmectite. Illite has also formed with gypsum and calcite in ephemeral hypersaline alkaline lakes that periodically dried out. This illite may have precipitated directly from solution. X-ray diffraction data and probe analyses indicate that the neoformed illite is Fe-rich. The K and Fe for the illitization are thought to be derived from weathered glauconite reworked from the underlying Bracklesham Group and Barton Beds.

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Synthesis and Characterization of Fe2+-CTS/CA-CNTs Composite and its Magnetic Properties

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.680.49 ◽

2013 ◽

Vol 680 ◽

pp. 49-53

Author(s):

Chang Yu ◽

Xu Zhang ◽

Kan He ◽

Yue Liu ◽

Jie Shan Qiu

Keyword(s):

Electron Microscopy ◽

Magnetic Properties ◽

Inductively Coupled Plasma ◽

Gravimetric Analysis ◽

X Ray Diffraction ◽

X Ray ◽

Inductively Coupled ◽

Transmission Electron ◽

Superparamagnetic State

A novel biocompatible Fe2+-chitosan (CTS)/citric acid modified carbon nanotube (CA-CNTs) composite (Fe2+-CTS/CA-CNTs) has been successfully synthesized by covalent bonding and crosslinking chemistry, followed by the reduction. The samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis spectrum, X-ray diffraction (XRD), inductively coupled plasma (ICP), thermal gravimetric analysis (TGA), and vibrating sample magnetometer (VSM) techniques. The results show that the CTS has been successfully grafted to the CA-CNTs carrier and Fe2+ ions are absorbed on the CTS by coordination bond mode. It was found that the Fe2+-CTS/CA-CNTs composite shows good magnetic properties with a low ratio of remanence to saturation magnetization and is in a superparamagnetic state at room temperature. It is believed that the Fe2+-CTS/CA-CNTs composite will be potential for application in MRI.

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Facile Synthesis of Basic Magnesium Carbonate with Different Morphology

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.554-556.575 ◽

2012 ◽

Vol 554-556 ◽

pp. 575-579 ◽

Cited By ~ 1

Author(s):

Yun Chuan Yang ◽

Hong Hao Yu ◽

Xin Ying Wang

Keyword(s):

Electron Microscopy ◽

Inductively Coupled Plasma ◽

Atomic Emission ◽

Magnesium Carbonate ◽

X Ray Diffraction ◽

Plasma Atomic Emission ◽

Facile Synthesis ◽

X Ray ◽

Inductively Coupled ◽

Transmission Electron

The preparation of different morphological basic magnesium carbonate particles with hollow rod-like, hull of peanut and leaf from the pyrogenation of magnesium carbonate trihydrate were described. The morphology, crystal phase and purity of basic magnesium carbonate were characterized by scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction (XRD) and inductively coupled plasma atomic emission spectrometer (ICP-AES). The results indicated that the formation of three morphological basic magnesium carbonates were obtained via platelike particles of magnesium carbonate trihydrate under certain conditions where the temperature and stirring rate were properly controlled. The length of the hollow rod means up to 6～7µm, and its diameter means up to 1～2µm.

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A study concerning the pretreatment of CNTs and its influence on the performance of NIB/CNTs amorphous catalyst

Journal of the Serbian Chemical Society ◽

10.2298/jsc0611153h ◽

2006 ◽

Vol 71 (11) ◽

pp. 1153-1160 ◽

Cited By ~ 6

Author(s):

Chang Hu-Yuan ◽

Feng Li ◽

Li. Hua ◽

Bin Zhang

Keyword(s):

Selective Hydrogenation ◽

Inductively Coupled Plasma ◽

Acid Treatment ◽

Chemical Reduction ◽

X Ray Diffraction ◽

Chemical Reduction Method ◽

X Ray ◽

Inductively Coupled ◽

Selective Hydrogenation Of Acetylene ◽

Transmission Electron

As prepared carbon nanotubes were pretreated with nitric acid (CNTs-HNO3) or ammonia (CNTs-NH3). Fourier transform infrared spectroscopy (FTIR) measurements showed that the surface of the nanotubes was functionalized with carboxylic and hydroxyl functional groups after the acid treatment and that basic groups containing nitrogen, such as N-H and C-N, were introduced to the surface of the nanotubes after the ammonia treatment. X-Ray diffraction analysis implied that the nickel residue in the CNTs was effectively removed by acid treatment. However, the nickel residue was only partially eliminated by ammonia pretreatment. NiB amorphous catalysts supported on CNTs-HNO3 and CNTs-NH3 were prepared by the impregnation-chemical reduction method and characterized by transmission electron microscopy (TEM), as well as inductively coupled plasma (ICP) spectroscopy and studied in the selective hydrogenation of acetylene. TEM measurements showed that a high density NiB particles of about 9 nm were homogeneously dispersed on the CNTs-NH3. However, NiB particles (13-23 nm)with amean size of 16 nm were scattered on the CNTs-HNO3.As a result, the activity and selectivity of NiB/CNTs-NH3 were higher than those of NiB/CNTs-HNO3 in the selective hydrogenation of acetylene.

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Degradation of Acid Red B by Manganese doped iron oxychloride and Permonosulfate: Performance and Inhomogeneous Activation Mechanism

10.21203/rs.3.rs-587174/v1 ◽

2021 ◽

Author(s):

Rong Chen ◽

Dan Zhao ◽

Yanmao Dong ◽

Chengrun Cai ◽

Yan Yuan ◽

...

Keyword(s):

Electron Microscopy ◽

Photoelectron Spectroscopy ◽

Ph Value ◽

Active Species ◽

Ion Concentration ◽

Activation Mechanism ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Initial Ph

Abstract manganese doped iron oxychloride (Mn-FeOCl) was synthesized by partial pyrolysis method. The Mn-FeOCl was used as heterogeneous catalyst to activate permonosulfate (PMS) for the degradation of azo dye acid red B(ARB) for the first time. The Mn-FeOCl was characterized by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction spectroscopy (XRD). The effects of Mn-FeOCl dosage, PMS concentration, initial pH value, Cl ion concentration and humic acid (HA) dosage on the degradation of ARB by Mn-FeOCl/PMS were investigated. Results showed that the ARB was degraded effectively by Mn-FeOCl/PMS. The mineralization rate of ARB reached 42.5%. As the Mn-FeOCl dosage was 0.1g/L, PMS concentration was 1mmol/L, and ARB concentration was 0.05mmol/L, the degradation rate of ARB reached 99.4% in 30 minutes. With the increase of PMS dosage, Mn-FeOCl dosage, Cl− ion concentration and initial pH value, the decolorization effect of ARB increased. The reaction mechanism was analyzed by free radical quenching experiment and XPS. The main active species were determined as ·OH and SO4·− which generated by PMS activation. The SO4·−−was the main active species.

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Acetalization of Glycerol with Citral over Heteropolyacids Immobilized on KIT-6

Catalysts ◽

10.3390/catal12010081 ◽

2022 ◽

Vol 12 (1) ◽

pp. 81

Author(s):

José Castanheiro

Keyword(s):

Electron Microscopy ◽

Inductively Coupled Plasma ◽

Fixed Time ◽

Tungstophosphoric Acid ◽

X Ray Diffraction ◽

Glycerol Conversion ◽

X Ray ◽

Inductively Coupled ◽

Catalytic Stability ◽

Scanning Electron

Glycerol acetalization with citral was studied using a heteropolyacid (tungstophosphoric acid) supported on KIT-6, as a catalyst, at 100 °C. Different catalysts were synthesized. Catalysts were characterized by scanning electron microscopy (SEM), inductively coupled plasma (ICP), X-ray diffraction (XRD), attenuated total refletion-Fourier transform infrared spectroscopy (ATR-FTIR), and potentiometric titrations. At a fixed time, the glycerol conversion increased with the H3PW12O40 (PW) on KIT-6. PW4-KIT-6 material had a higher conversion than other catalysts. The optimization of glycerol’s acetalization with citral was studied under the PW4-KIT-6 catalyst. After 5 h, it was found that, at T = 100 °C, with m = 0.3 g of solid, molar glycerol:citral = 1:2.25, the conversion of glycerol was 89%. Moreover, the PW4-KTI-6 catalyst showed good catalytic stability.

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Catalytic Properties of Alumina-Supported Ruthenium, Platinum, and Cobalt Nanoparticles towards the Oxidation of Cyclohexane to Cyclohexanol and Cyclohexanone

BULLETIN OF CHEMICAL REACTION ENGINEERING AND CATALYSIS ◽

10.9767/bcrec.13.1.1226.24-35 ◽

2018 ◽

Vol 13 (1) ◽

pp. 24

Author(s):

Ilhem Rekkab-Hammoumraoui ◽

Abderrahim Choukchou-Braham

Keyword(s):

Inductively Coupled Plasma ◽

Catalytic Properties ◽

Optical Emission ◽

Cobalt Nanoparticles ◽

Impregnation Method ◽

X Ray Diffraction ◽

X Ray ◽

Inductively Coupled ◽

Fourier Transformed Infrared Spectroscopy ◽

Transmission Electron

A series of metal-loaded (Ru, Pt, Co) alumina catalysts were evaluated for the catalytic oxidation of cyclohexane using tertbutylhydroperoxide (TBHP) as oxidant and acetonitrile or acetic acid as solvent. These materials were prepared by the impregnation method and then characterized by Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES), H2 chemisorption, Fourier Transformed Infrared Spectroscopy (FTIR), High-Resolution Transmission Electron Microscopy (HRTEM), and X-ray Diffraction (XRD). All the prepared materials acted as efficient catalysts. Among them, Ru/Al2O3 was found to have the best catalytic activity with enhanced cyclohexane conversion of 36 %, selectivity to cyclohexanol and cyclohexanone of 96 % (57.6 mmol), and cyclohexane turnover frequency (TOF) of 288 h-1. Copyright © 2018 BCREC Group. All rights reservedReceived: 26th May 2017; Revised: 17th July 2017; Accepted: 18th July 2017; Available online: 22nd January 2018; Published regularly: 2nd April 2018How to Cite: Rekkab-Hammoumraoui, I., Choukchou-Braham, A. (2018). Catalytic Properties of Alumina-Supported Ruthenium, Platinum, and Cobalt Nanoparticles towards the Oxidation of Cyclohexane to Cyclohexanol and Cyclohexanone. Bulletin of Chemical Reaction Engineering & Catalysis, 13(1): 24-36 (doi:10.9767/bcrec.13.1.1226.24-35)

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Synthesis of quaternary metal oxides immobilized on APTMS-coated magnetite: an efficient and reusable nanocatalyst for Knoevenagel condensation under green conditions

Canadian Journal of Chemistry ◽

10.1139/cjc-2020-0421 ◽

2021 ◽

Author(s):

Masumeh Gilanizadeh ◽

Behzad Zeynizadeh

Keyword(s):

Electron Microscopy ◽

Metal Oxides ◽

Knoevenagel Condensation ◽

Reaction Times ◽

Aromatic Aldehydes ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Recoverable Catalyst ◽

Magnetically Recoverable Catalyst

A simple, green and highly efficient procedure has been developed for Knoevenagel condensation of malononitrile and aromatic aldehydes to the corresponding benzylidenemalononitriles in the presence of Fe3O4@APTMS@Zr-Sb-Ni-Zn nanoparticles (NPs) as a durable nanocatalyst. The heterogeneous nanocomposite was prepared by immobilization of Zr-Sb-Ni-Zn mixed metal oxides on APTMS-coated magnetite. The synthesized catalyst was characterized using Fourier-transform infrared spectroscopy (FT-IR), energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), X-ray diffraction (XRD), vibration sample magnetometer (VSM), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET). In this approach, the condensation of malononitrile and aromatic aldehydes were done in water under reflux conditions to give the corresponding products within 3-60 minutes in 89-95% yields. The magnetically recoverable catalyst was recycled and reused about four times without remarkable loss of activity. This method offers various benefits such as mild and eco-friendly reaction conditions, short reaction times and high purity of products, excellent efficiency and use of water as green solvent, reusability and recoverability of the nanostructure catalyst.

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PREPARATION AND ELECTROCHEMICAL PROPERTIES OF NANOSTRUCTURED Li0.8CoO2

International Journal of Nanoscience ◽

10.1142/s0219581x06004371 ◽

2006 ◽

Vol 05 (02n03) ◽

pp. 285-290 ◽

Cited By ~ 1

Author(s):

YONGHUA LENG ◽

XINGGUO LI ◽

HUAQUAN YANG ◽

HENGHUI ZHOU

Keyword(s):

Electrochemical Properties ◽

Inductively Coupled Plasma ◽

Sol Gel ◽

Open Circuit ◽

X Ray Diffraction ◽

X Ray ◽

Inductively Coupled ◽

Grinding Method ◽

Transmission Electron ◽

Lower Discharge

Submicron Li 0.8 CoO 2 particles were prepared by sol–gel method, and then ball-mill grinding method was adopted to make nanosized Li 0.8 CoO 2 powders. The two kinds of powders were then examined by X-ray diffraction (XRD), ICP (inductively coupled plasma), the multi-point BET (Brunauer, Emmett and Teller) and transmission electron micrographs (TEM). It appeared that the Li 0.8 CoO 2 nanoparticles exhibited quite different electrochemical properties, such as higher open-circuit voltage and lower discharge capacity, compared to submicron Li 0.8 CoO 2 particles.

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