scholarly journals Nanoscale etching of III-V semiconductors in acidic hydrogen peroxide solution: GaAs and InP, a striking contrast in surface chemistry

2019 ◽  
Vol 465 ◽  
pp. 596-606 ◽  
Author(s):  
Dennis H. van Dorp ◽  
Sophia Arnauts ◽  
Mikko Laitinen ◽  
Timo Sajavaara ◽  
Johan Meersschaut ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Chemistry ◽  
Hydrogen Peroxide Solution ◽  
Acidic Hydrogen ◽  
Striking Contrast

Chemical changes in silver birch (Betula pendula Roth) wood caused by hydrogen peroxide bleaching and monitored by color measurement (CIELab) and UV-Vis, FTIR and UVRR spectroscopy

Holzforschung ◽  
2005 ◽  
Vol 59 (4) ◽  
pp. 381-388 ◽  
Author(s):  
Kirsi Mononen ◽  
Anna-Stiina Jääskeläinen ◽  
Leila Alvila ◽  
Tuula T. Pakkanen ◽  
Tapani Vuorinen
Keyword(s):  
Hydrogen Peroxide ◽  
Betula Pendula ◽  
Silver Birch ◽  
Hydrogen Peroxide Solution ◽  
Birch Wood ◽  
Chemical Changes ◽  
Color Measurements ◽  
Bleaching Treatment ◽  
Acidic Hydrogen ◽  
Cielab Color

Abstract Silver birch (Betula pendula Roth) wood was subjected to bleaching with acidic hydrogen peroxide solution. The color change and chemical changes occurring on bleaching were investigated by CIELab color measurements and UV-Vis, FTIR and UVRR spectroscopy. With bleaching, the color of birch wood changed notably towards white, less red and more yellow, revealed by the CIELab color measurements, however, followed by notable yellowing in 343 days. The chemical changes occurring with the bleaching treatment in the xylem of birch, demonstrated by UV-Vis, FTIR and UVRR spectroscopy, indicated degradation of aromatic structures with a simultaneous increase in relative amounts of unconjugated carbonyl structures. The results indicate that the degradation of aromatic structures involved opening of the aromatic ring possibly leading to the formation of muconic acids or other low molecular weight products rich in carbonyl structures. In addition, in birch wood subjected to bleaching treatment with acidic hydrogen peroxide solution, syringyl structures provided favorable sites for the degradation of aromatic structures.

Enzymatic Iodination of Maleic and Fumaric Acids Diethyl Esters

2009 ◽  
Vol 59 (12) ◽  
pp. 1400-1404
Author(s):  
Marius Tudorascu ◽  
Spiridon Oprea ◽  
Afrodita Doina Marculescu ◽  
Stefania Tudorascu
Keyword(s):  
Hydrogen Peroxide ◽  
Tartaric Acid ◽  
Disperse System ◽  
Hydrogen Peroxide Solution ◽  
Ultrasonic Pretreatment ◽  
Tartaric Acids ◽  
Inactive Form ◽  
Generating System ◽  
Sole Product

The mechanism of the enzymatic iodination process of diethylmaleate and diethylfumarate (which present no miscibility with water) in the presence of lactoperoxidase, both in diluted hydrogen peroxide solution and in a generating system of hydrogen peroxide using ammonium and calcium iodides as halide sources in disperse system (after an ultrasonic pretreatment) was studied. The obtained sole product (diethyl-2, 3-diiodosuccinate) after the enzymatic iodination process was directly hydrolyzed to a tartaric acid present in an optically inactive form. The mechanism of obtaining the intermediate and final products and respectively, the existence of both D, L-tartaric acid and meso-tartaric acids (as lithium bitartrates) were also investigated.

Gas Embolism After Ingestion of Hydrogen Peroxide

PEDIATRICS ◽  
1990 ◽  
Vol 85 (4) ◽  
pp. 593-594
Author(s):  
WAYNE R. RACKOFF ◽  
DAVID F. MERTON
Keyword(s):  
Hydrogen Peroxide ◽  
Case Report ◽  
Venous System ◽  
Hydrogen Peroxide Solution ◽  
Portal Venous System ◽  
Gas Embolism ◽  
Colonic Irrigation ◽  
Radiographic Evidence ◽  
Portal Venous Gas ◽  
Venous Gas Embolism

Gas embolism to the portal venous system is a well-recognized radiographic sign in infants with necrotizing enterocolitis. It also has been seen after colonic irrigation with hydrogen peroxide solution.1,2 We present what we believe is the first reported patient with radiographic evidence of portal venous gas embolism after ingestion of hydrogen peroxide solution. This finding is important because gas embolism to the portal venous system after colonic irrigation with hydrogen peroxide has been associated with gangrenous and perforated bowel.1,2 CASE REPORT A 2-year-old boy ingested an unknown amount of 3% hydrogen peroxide solution. The child was found with foam around his mouth.

Sulphur removal from Artvin-Yusufeli lignite with acidic hydrogen peroxide solutions

2016 ◽  
Vol 10 (1/2/3) ◽  
pp. 178 ◽  
Author(s):  
Menderes Levent ◽  
Ömer Kaya ◽  
M. Muhtar Kocakerim ◽  
Özkan Küçük
Keyword(s):  
Hydrogen Peroxide ◽  
Acidic Hydrogen ◽  
Sulphur Removal

scholarly journals Heterogeneous Fenton-Like Oxidation of Methylene Blue Using Alternative Catalysts

2021 ◽  
Vol 29 (48) ◽  
pp. 91-97
Author(s):  
Juraj Michálek ◽  
Kseniya Domnina ◽  
Veronika Kvorková ◽  
Kristína Šefčovičová ◽  
Klaudia Mončeková ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Methylene Blue ◽  
Low Cost ◽  
Hydrogen Peroxide Solution ◽  
Blue Dye ◽  
Order Kinetic ◽  
Heterogeneous Fenton ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Black Nickel

Abstract The usage of the low-cost catalysts for methylene blue removal from wastewater was investigated. Heterogeneous Fenton-like process consists of the use of a hydrogen peroxide solution, and an iron-rich catalyst, red mud and black nickel mud were used for that purpose. The factors such as the catalyst dose and the hydrogen peroxide solution volume were monitored. The results of experiments showed that the degradation of methylene blue dye in Fenton-like oxidation process using selected catalysts can be described by a pseudo-second-order kinetic model. The highest dye removal efficiency (87.15 %) was achieved using the black nickel mud catalyst after 30 minutes of reaction.

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