Synergistic effect between CO2 and H2O2 on ethylbenzene oxidation catalyzed by carbon supported heteropolyanion catalysts

Abstract A series of Keggin heteropolytungstate salts (M1.5PW12O40, M=Cu, Co, Zn and Fe) were prepared and characterized utilizing inductively coupled plasma spectrometry (ICP), Fourier transform infrared (FTIR) spectra, and ultraviolet-visible (UV-Vis) light spectroscopy. The as-prepared catalysts were tested for the oxidation of ethylbenzene by using carbon dioxide/hydrogen peroxide (CO2/H2O2) as the oxidizing agent system under solvent-free conditions. The results indicated that the heteropolytungstates catalyzed the side chain oxidation of ethylbenzene leading to acetophenone as a major product. The effect of various reaction parameters on ethylbenzene oxidation over the best catalyst of the series, namely Co1.5PW12O40 loaded on activated carbon (AC), was investigated. It was found that the selectivity depends strongly on the reaction temperature. Higher reaction temperatures reduce the conversion due to the decomposition of H2O2. Oxidation by a large amount of H2O2 decreases the conversion owing to a decrease of the solubility of ethylbenzene in an aqueous medium, and favors the oxidation of the reaction products, which are more soluble in an aqueous medium. The increase of the CO2 pressure improves both the conversion and the selectivity of acetophenone due to the involvement of the percarbonate species (HCO4−) responsible for oxidation by oxygen transfer.

Download Full-text

Arsenoplatin-Ferritin Nanocage: Structure and Cytotoxicity

International Journal of Molecular Sciences ◽

10.3390/ijms22041874 ◽

2021 ◽

Vol 22 (4) ◽

pp. 1874

Author(s):

Giarita Ferraro ◽

Alessandro Pratesi ◽

Damiano Cirri ◽

Paola Imbimbo ◽

Daria Maria Monti ◽

...

Keyword(s):

Biological Activity ◽

Diffraction Data ◽

Inductively Coupled Plasma ◽

Emission Spectroscopy ◽

Atomic Emission ◽

Side Chain ◽

Plasma Atomic Emission ◽

Average Amount ◽

X Ray ◽

Inductively Coupled

Arsenoplatin-1 (AP-1), the prototype of a novel class of metallodrugs containing a PtAs(OH)2 core, was encapsulated within the apoferritin (AFt) nanocage. UV-Vis absorption spectroscopy and inductively coupled plasma-atomic emission spectroscopy measurements confirmed metallodrug encapsulation and allowed us to determine the average amount of AP-1 trapped inside the cage. The X-ray structure of AP-1-encapsulated AFt was solved at 1.50 Å. Diffraction data revealed that an AP-1 fragment coordinates the side chain of a His residue. The biological activity of AP-1-loaded AFt was comparatively tested on a few representative cancer and non-cancer cell lines. Even though the presence of the cage reduces the overall cytotoxicity of AP-1, it improves its selectivity towards cancer cells.

Download Full-text

Performance of a commercial maximum dissolved solids nebuliser for inductively coupled plasma spectrometry

The Analyst ◽

10.1039/an9851000531 ◽

1985 ◽

Vol 110 (5) ◽

pp. 531 ◽

Cited By ~ 11

Author(s):

Stephen J. Walton ◽

John E. Goulter

Keyword(s):

Inductively Coupled Plasma ◽

Dissolved Solids ◽

Plasma Spectrometry ◽

Inductively Coupled ◽

Inductively Coupled Plasma Spectrometry

Download Full-text

Flow injection techniques in inductively coupled plasma spectrometry. Plenary lecture

Journal of Analytical Atomic Spectrometry ◽

10.1039/ja9870200549 ◽

1987 ◽

Vol 2 (6) ◽

pp. 549 ◽

Cited By ~ 47

Author(s):

Cameron W. McLeod

Keyword(s):

Flow Injection ◽

Inductively Coupled Plasma ◽

Plenary Lecture ◽

Plasma Spectrometry ◽

Inductively Coupled ◽

Inductively Coupled Plasma Spectrometry ◽

Injection Techniques

Download Full-text

Presence of radionuclides and toxic elements in feedstuffs and food of animal origin

Veterinarski glasnik ◽

10.2298/vetgl190220008m ◽

2019 ◽

Vol 73 (1) ◽

pp. 30-39 ◽

Cited By ~ 1

Author(s):

Branislava Mitrovic ◽

Borjana Vranjes ◽

Olga Kostic ◽

Veljko Perovic ◽

Miroslava Mitrovic ◽

...

Keyword(s):

Inductively Coupled Plasma ◽

Toxic Elements ◽

Gamma Ray ◽

Animal Feed ◽

Average Concentration ◽

Animal Origin ◽

Gamma Ray Spectrometry ◽

Plasma Spectrometry ◽

Inductively Coupled ◽

Food Of Animal Origin

Introduction. The aim of this study was to determine the content of radionuclides and toxic elements in samples feedstuffs and food of animal origin collected between 2007- 2017 from two suburban areas of Belgrade, the municipalities of Palilula and Surcin, both areas with intensive agricultural production. Materials and Methods. Radionuclides (40K and 137Cs) and toxic elements (As, Cd, Cu, Ni, Pb and Zn) were determined in samples of corn, hay, meat, milk and eggs, by gamma ray spectrometry and inductively coupled plasma spectrometry (ICP-OES, Spectro Genesis). Results and Conclusions. The obtained results showed that natural 40K was present in all investigated samples. The average activity concentration of 40K was 94 Bq/kg in corn, 117 Bq/kg, 108 Bq/kg and 95 Bq/kg in beef, pork and chicken meat, respectively, as well as 61 Bq/kg in cow?s milk and 48 Bq/kg in eggs. Anthropogenic radionuclide 137Cs was not detected. The trend for toxic element levels according to the average concentrations found in the studied feed samples (corn and hay) was as follows: Zn>Cu>Pb>As>Ni>Cd. Arsenic was detected in animal feed in both Belgrade municipalities, with the average concentration being 1.08 mg/kg (0.5-1.37 mg/kg), and in corn, the As content was higher than in hay samples. In food of animal origin, only Zn and Cu were detected. It is concluded that the presence of radionuclides and toxic elements in feedstuffs and foods of animal origin does not pose a health risk for either humans or animals.

Download Full-text