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Wet oxidation
About: Wet oxidation is a research topic. Over the lifetime, 3094 publications have been published within this topic receiving 61536 citations.
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TL;DR: In this paper, the authors introduced catalytic wet air oxidation (CWAO) as an efficient technique for complete mineralization of glyphosate or N-(phosphonomethyl) glycine (PMG) in wastewater using the iron nanoparticle (Fe NP)-dispersed carbon nanofibers (CNFs) decorated over activated carbon beads (ACBs) (~0.8mm size).
20 citations
TL;DR: In this paper, it was found that the stable silicoboron glassy self-healing phase formed from the oxidation of SiBCN had favorable oxidation resistance in wet oxygen atmosphere.
Abstract: Polymer derived SiBCN ceramic was introduced into carbon fiber reinforced SiC composites to prepare C/SiC-SiBCN composites. Weight change and flexural strength of the samples after oxidation at different temperatures and in different atmospheres were tested up to 100 h to investigate their wet oxidation behavior. It was found that the stable silicoboron glassy self-healing phase formed from the oxidation of SiBCN had favorable oxidation resistance in wet oxygen atmosphere. And the SiC-SiBCN matrix can provide about 50 h of protection for carbon fiber in wet oxygen. Besides, the influence of temperature on the oxidation behavior of C/SiC-SiBCN composites were much related to the release speed of gas products (B2O3, HBO2 and Si(OH)4). And the oxidation mechanism of SiC/SiC-SiBCN composites were further explained by the comparation with C/SiC-SiBCN composites.
20 citations
TL;DR: In this article, a thin Si1−xGex films on insulator (SGOI) with high Ge fraction were fabricated through Ge condensation and X-TEM analysis indicated that the crystal quality and overall uniformity of such a layer was poor.
20 citations
TL;DR: A combination of ferric chloride and sodium nitrite is a competent catalyst for catalytic bleaching of a broad range of dye pollutants under moderate condition (T = 150 degrees C; oxygen pressure = 0.5 MPa; pH 2.5).
Abstract: A combination of ferric chloride and sodium nitrite is a competent catalyst for catalytic bleaching of a broad range of dye pollutants under moderate condition (T = 150 degrees C; oxygen pressure = 0.5 MPa; pH 2.5). To evaluate the catalytic degradation system, we implemented wet oxidation of Acid Blue 129 (AB 129) at the temperatures between 110 and 150 degrees C using FeCl3/NaNO2 as the catalyst. The degradation process was monitored by UV-vis spectroscopy, HPLC, IC, GC-MS and TOC analysis. At 150 degrees C and 0.5 MPa oxygen, 50.9% TOC and 100% color were removed after 2 h treatment, while no obvious TOC and only 20.4% color removal were achieved without the catalyst at the same experimental conditions. The main degradation products detected were CO2 and some small organic acids. The reaction kinetics of the process was also studied in the temperature range of 120-150 degrees C. AB 129 degradation can be described by pseudo-first-order kinetics over the temperature range. Furthermore, this catalytic system is also highly efficient for tackling a variety of substrates including azo and anthraquinone dye pollutants. (c) 2007 Elsevier B.V. All rights reserved.
20 citations
TL;DR: Waters et al. as discussed by the authors proposed a method for the extraction of dissolved organic carbon (DOC) from water, which is adapted from Burr et al.'s method using the basic steps: sample filtration, acidification to liberate and remove dissolved inorganic carbon (DIC), evaporation of the sample to isolate salts that include trace quantities of carbon, combustion of the salts, and purification of the CO2.
Abstract: We present a method for the extraction of dissolved organic carbon (DOC) from water. The method is adapted from Burr et al. (2001) using the basic steps: 1) sample filtration; 2) acidification to liberate and remove dissolved inorganic carbon (DIC); 3) evaporation of the sample to isolate salts that include trace quantities of carbon; 4) combustion of the salts; and 5) purification of the CO2. Two significant improvements have been made to the earlier method. The first is to use wet oxidation with potassium permanganate to oxidize organics in place of the combustion step and the second is the development of a reduction/oxidation purification procedure to remove sulfur and nitrogen oxides that may form during the oxidation step. Wet oxidation has a practical advantage over the previous method because it proceeds at low temperature (70 ° C). The original method required quartz vessels to oxidize the salts at 900 ° C. At this temperature, salts in the samples formed gases that interfered with the isolation of CO2 and the quartz vessels degraded with each combustion, affecting their structural integrity. The expensive quartz vessels could only be used for a limited number of samples, whereas Pyrex vessels used for wet oxidation are inexpensive and can be used indefinitely. The blank fraction modern carbon ( f ) and its mass dependence for the refined technique was determined from repeat analyses of salicylic acid produced from petrochemicals. For samples with a mass m above 0.5 mg, F = 0.0083 ± 0.0011. For samples below 0.5 mg, the blank follows a 1/ m dependence as observed for other accelerator mass spectrometry (AMS) 14C measurements (Donahue et al. 1990). The reproducibility of the method is demonstrated using repeat measurements from a variety of samples, including a sample measured with the former high-temperature 900 °C combustion technique. The virtues of the wet oxidation method are that it is economical, produces a low blank, and provides good reproducibility. DOI: 10.2458/azu_js_rc.55.16277
20 citations