Chemical analysis of plasma-polymerized films: The application of X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (NEXAFS) and fourier transform infrared spectroscopy (FTIR)

The acidic hierarchical zeolite ZSM-5 (HZSM-5-H) was synthesized for the preparation of a supported Ru catalyst (Ru/HZSM-5-H). The obtained Ru/HZSM-5-H catalyst shows high activity and product selectivity in the seleno-functionalization of alkenes compared to g-Al 2 O 3 , basic ETS-10 and acidic microporous zeolite ZSM-5 supported Ru catalysts (Ru/g-Al 2 O 3 , Ru/ETS-10 and Ru/HZSM-5, respectively), as well as a homogeneous RuCl 3 catalyst. The relatively strong acidic sites in Ru/HZSM-5-H could benefit the adsorption of styrenes and the activation of the C]C bond. Meanwhile, Ru 4+ in Ru/HZSM-5-H could facilitate the formation of electrophilic selenium species as compared to Ru 0 species. In addition, the Ru/ HZSM-5-M catalyst exhibits broad substrate compatibility in the difunctionalization of alkenes.

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“…4b). [37][38][39] These results conrm that the C]C bond in styrene was activated on the acidic Ru/HZSM-5-H catalyst.…”

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confidence: 71%

“…8b). [37][38][39] In contrast, two new bands at 2862 and 2937 cm À1 appear in the spectrum of the Ru/HZSM-5-H-1a sample. Similar absorption bands at 2873 and 2931 cm À1 are observed in the spectrum of ethylbenzene, which are related to the C-H stretching vibrations in methyl and methylene in ethylbenzene (Fig.…”

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confidence: 94%

Acidic hierarchical zeolite ZSM-5 supported Ru catalyst with high activity and selectivity in the seleno-functionalization of alkenes

et al. 2017

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“…The band appearing in the region 2921 cm −1 is connected with stretching vibrations between carbon and hydrogen, characteristic of -CH 2 -and -CH 3 structures [36,37]. The presence of this band suggests the existence of some aliphatic species on the surface of the carbon gel.…”

Section: Physicochemical Characteristicsmentioning

confidence: 99%

“…On considering the structural data presented in Table 2, it is also clear that the addition of GIC led to the increase in the average pore diameter of mesopores and is responsible for the increase in their cumulative volume of pores. , is associated with the surface hydroxylic groups and chemisorbed water [31][32][33][34][35][36][37][38]. The intensities of these peaks are similar for all samples.…”

Section: Physicochemical Characteristicsmentioning

confidence: 99%

Removal of lead(II), copper(II), cobalt(II) and nickel(II) ions from aqueous solutions using carbon gels

Osińska

2016

J Sol-Gel Sci Technol

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The carbon gel and carbon gel doped with 0.5, 1 and 2 wt% of graphite intercalation compound were used for the removal of heavy metals from aqueous solutions. These materials were prepared by a sol-gel process that involves a polycondensation of resorcinol and formaldehyde. Nitrogen adsorption, scanning electron microscopy, energy dispersive spectroscopy and fourier transform infrared spectroscopy were used for a morpho-structural adsorbent investigation. In the present paper, Cu, Co, Pb and Ni ions adsorption experiments were carried out in batch conditions under magnetic stirring. The effect of some parameters such as contact time, metal ions' concentration and pH were examined. Adsorption data on all sorbents, followed both the Frendlich and Langmuir models. The data better fitted the Langmuir isotherm than the Frendlich one. The highest degree of removal was achieved for Pb ions at the initial concentration of 10 mg/l and for 2 g/l adsorbent dose. Adsorption results expressed as adsorption capacities showed that carbon gel doped with 2 wt% of graphite intercalation compound is the best adsorbent. Graphical Abstract Keywords Carbon gels• Pb(II)• Cu(II)• Co(II) and Ni(II) ions• Adsorption of heavy metal ions • Graphite intercalation compound

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“…NEXAFS spectroscopy, which is in its electron yield mode surface sensitive as XPS, provides complementary molecular information, especially for unsaturated species. [6] …”

Section: Introductionmentioning

confidence: 99%

Derivatization of amino groups by pentafluorobenzaldehyde (PFB) as observed by XPS and NEXAFS spectroscopy on spin coated 4,4′‐methylenebis(2,6‐diethylaniline) films

Yeğen

Lippitz

Treu

et al. 2008

Surface & Interface Analysis

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A toluene solution of 4,4 -methylenebis(2,6-diethylaniline) was spin coated on Si wafers. The samples were derivatized with pentafluorobenzaldehyde (PFB) in order to determine the primary amino groups on the surface. XPS C 1s and N 1s and C and N K-edge NEXAFS of underivatized and derivatized films were carefully analyzed. The result was that after 10 min of exposure the gas-surface reaction was already completed. A reasonable derivatization reaction yield in the order of 90% is derived from the experiments. This number correlates well to a reaction yield obtained by a wet chemical approach.

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Chemical analysis of plasma-polymerized films: The application of X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (NEXAFS) and fourier transform infrared spectroscopy (FTIR)

Cited by 118 publications

References 24 publications

Acidic hierarchical zeolite ZSM-5 supported Ru catalyst with high activity and selectivity in the seleno-functionalization of alkenes

Acidic hierarchical zeolite ZSM-5 supported Ru catalyst with high activity and selectivity in the seleno-functionalization of alkenes

Removal of lead(II), copper(II), cobalt(II) and nickel(II) ions from aqueous solutions using carbon gels

Derivatization of amino groups by pentafluorobenzaldehyde (PFB) as observed by XPS and NEXAFS spectroscopy on spin coated 4,4′‐methylenebis(2,6‐diethylaniline) films

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