Adsorption Mechanism of Environmentally Friendly Insulating Gas C5F10O and Its Main Decomposition Products on Cu (1 1 1) Surface

2020 ◽  
Author(s):  
Fuping Zeng ◽  
Xiaoxuan Feng ◽  
Zhicheng Lei ◽  
Siying Wu ◽  
Congdong She ◽  
...  
Keyword(s):  
Adsorption Mechanism ◽  
Environmentally Friendly ◽  
Decomposition Products ◽  
Main Decomposition

scholarly journals Fabrication and Adsorption Optimization of Novel Magnetic Core-shell Chitosan/Graphene Oxide/β-cyclodextrin Composite Materials for Bisphenols in Aqueous Solutions

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5408
Author(s):  
Yichao Gong ◽  
Jianbing Su ◽  
Muyuan Li ◽  
Aixue Zhu ◽  
Guisui Liu ◽  
...  
Keyword(s):  
Composite Material ◽  
Graphene Oxide ◽  
Adsorption Mechanism ◽  
Raw Materials ◽  
Environmentally Friendly ◽  
Magnetic Core ◽  
Magnetic Composite ◽  
Order Kinetic ◽  
Mixed Solution ◽  
Adsorption Parameters

A novel magnetic composite material, Fe3O4@SiO2/chitosan/graphene oxide/β-cyclodextrin (MCGC), was prepared by multi-step methods. Various methods were used to systematically characterize the morphology, composition, structure, and magnetic properties of MCGC. The results obtained show that the composite material has good morphology and crystal structure and can be separated quickly by an external magnetic field. The operation is relatively easy, and the raw materials used to prepare this material are economical, easy to obtain, and environmentally friendly. The performance and adsorption mechanism for using this material as an adsorbent to remove bisphenol A (BPA) and bisphenol F (BPF) from water were studied. The adsorption parameters were optimized. Under optimal conditions, MCGC was found to remove more than 90% of BPA and BPF in a mixed solution (20 mg/L, 50 mL); the adsorption process for BPA and BPF on MCGC was found to follow a Redlich–Peterson isotherm model and Pseudo-second-order kinetic model. The adsorption mechanism for MCGC may involve a combination of various forces. Recycling experiments showed that after five uses, MCGC retained a more than 80% removal effect for BPA and BPF, and through real sample verification, MCGC can be used for wastewater treatment. Therefore, MCGC is economical, environmentally friendly, and easy to separate and collect, and has suitable stability and broad application prospects.

Low Temperature Infrared Spectrometric Studies of Difluorodisulfane, Thiothionylfluoride and Difluorotrisulfane

1975 ◽  
Vol 30 (9) ◽  
pp. 1156-1163 ◽  
Author(s):  
Karl-Peter Wanczek ◽  
Claus Bliefert ◽  
Rudolf Budenz
Keyword(s):  
Low Temperature ◽  
Solid Phase ◽  
Frequency Range ◽  
Absorption Bands ◽  
Temperature Spectrum ◽  
Decomposition Products ◽  
Bond Lengths ◽  
Main Decomposition ◽  
Stretching Vibrations ◽  
Sulfur Tetrafluoride

The low temperature IR stretching vibrations of difluorodisulfane (FSSF) and thiothionylfluoride (SSF2), in the solid phase and in a cyclohexane matrix, of the mixtures FSSF -SSF2, FSSF-OSF2 and SSF, -OSF2, and of solid difluorotrisulfane (FS3F) have been investigated. While SSF, forms no distinct oligomers, a dimer with absorption bands at 635 and 682 cm-1 has been detected in the case of FSSF. These differences between FSSF and SSF, are rationalized by the different S-F bond lengths. A structure of the FSSF dimer similar to that of the sulfur tetrafluoride dimer is proposed. The low temperature spectrum of FS3F shows 3 bands in the frequency range between 460 and 1000 cm-1: 590, 605 and 680 cm-1, due to associated molecules. FS3F decomposes on warming. The main decomposition products containing fluorine are FSSF and SSF2. Mechanisms for the rearrangement and decomposition of the three compounds studied are discussed

THERMAL DECOMPOSITION AND DESORPTION OF DIETHYLAMIDO OF TETRAKIS(DIETHYLAMIDO)ZIRCONIUM (TDEAZr) ON Si(100)

2003 ◽  
Vol 10 (01) ◽  
pp. 121-125 ◽  
Author(s):  
JOONHEE JEONG ◽  
SUNGWON LIM ◽  
KIJUNG YONG
Keyword(s):  
Thermal Decomposition ◽  
Photoelectron Spectroscopy ◽  
Film Growth ◽  
Reaction Pathway ◽  
Thin Film Growth ◽  
Decomposition Products ◽  
Main Decomposition ◽  
Temperature Programmed ◽  
N Incorporation ◽  
Decomposition Pathway

The thermal decomposition pathway and desorption of diethylamido of tetrakis(diethylamido)zirconium [TDEAZr, Zr(N(C2H5)2)4] on Si(100) were studied using temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). During TPD experiments, ethylethyleneimine (C2H5N=CHCH3), diethylamine [NH(C2H5)2], acetonitrile (CH3CN), ethylene (C2H4) and hydrogen (H2) desorbed as the main decomposition products of diethylamido, which was chemisorbed on Si(100) through the scission of the zirconium–diethylamido bond in TDEAZr. After TPD runs, the formation of silicon carbide and silicon nitride was observed on the surface by XPS, indicating that a complete decomposition of diethylamido proceeded. This could be a reaction pathway of C, N incorporation in the thin film growth using TDEAZr as a Zr precursor.

Isolation and Characterization of the Radiation-Induced Degradation Products of 2′-Deoxyguanosine in Oxygen-Free Aqueous Solutions

1985 ◽  
Vol 40 (11) ◽  
pp. 1519-1531 ◽  
Author(s):  
Maurice Berger ◽  
Jean Cadet
Keyword(s):  
High Performance ◽  
Degradation Products ◽  
Imidazole Ring ◽  
Spectroscopic Techniques ◽  
Decomposition Products ◽  
H Nmr ◽  
Isolation And Characterization ◽  
Radiation Induced ◽  
Main Decomposition

The bulk of the radiation-induced degradation products of 2′-deoxyguanosine in oxygen-free aqueous solution have been separated by high performance liquid chromatography and charac­terized by various spectroscopic techniques including fast atom bombardment mass spectrometry, 1H NMR and circular dichroism. The two main decomposition products result from the opening of the imidazole ring and further rearrangement of the sugar moiety. In addition, the formation of six other nucleosides was shown to involve sugar radicals with subsequent epimerization, re­arrangement or cyclization reactions.

Thermal decomposition of hexamethylenetetramine: mechanistic study and identification of reaction intermediates via a computational and NMR approach

2021 ◽  
Author(s):  
Sebastian O. Simonetti ◽  
Teodoro S Kaufman ◽  
Rodolfo Maximiliano Rasia ◽  
Ariel Marcelo Sarotti ◽  
Nicolás Grimblat
Keyword(s):  
Thermal Decomposition ◽  
Nmr Spectra ◽  
Mechanistic Study ◽  
Reaction Intermediates ◽  
Decomposition Products ◽  
Main Decomposition

In a joint DFT and chemometrics study applied to NMR spectra, we disclose the structure of the main decomposition products of hexamethylenetetramine. The combination of these techniques enabled us to...

Kinetics and Species of Flash Pyrolysis of Cellulose Acetate Butyrate: The Binder of Lova

1995 ◽  
Vol 418 ◽  
Author(s):  
P. E. Gongwer ◽  
H. Arisawa ◽  
T. B. Brill
Keyword(s):  
Cellulose Acetate ◽  
Cellulose Acetate Butyrate ◽  
Decomposition Products ◽  
Product Evolution ◽  
Rapid Scan ◽  
Volatile Products ◽  
Main Decomposition ◽  
Condensed Phase Reactions ◽  
Novel Products ◽  
Acetate Butyrate

AbstractThe principal binder of many LOVA propellants is cellulose acetate butyrate (CAB). By the use of T-Jump/FTIR spectroscopy, CAB was flash-pyrolyzed to set temperatures in the 465–600°C range, while rapid-scan IR spectra were used to identify the main decomposition products and to measure the rate of formation of each product as a function of temperature. Eleven specific products, which include oligomers of CAB, acids, aldehydes, ketenes, esters, CO2 and CO, were quantified by chemometric procedures. The ketenes are the most novel products. The Arrhenius parameters reveal that below 510 ± 20°C, the rate of product evolution is controlled mainly by condensed phase reactions. Above 510 ± 20°C, the rate of product evolution is controlled by desorption/evaporation of the volatile products.

Degradation of a Synthetic Forging Lubricant

2000 ◽  
Author(s):  
Walter W. Olson ◽  
Sreekumar Natarajan ◽  
Martin A. Abraham
Keyword(s):  
Acetic Acid ◽  
Sodium Silicate ◽  
Experimental Work ◽  
Environmentally Friendly ◽  
Metal Salts ◽  
Decomposition Products ◽  
Phthalic Acids ◽  
The Stability

Abstract Synthetic forging fluids are marketed as environmentally friendly alternatives to water graphite emulsions. Since these fluids are generally dialkali metal salts of phthalic acids, a concern was the stability of the fluid under forging conditions. The objectives studied were how long does the fluid take to decompose, what are the products and what are the reactions that occur in the decomposition. The material chosen for study after review of patents of synthetic forging fluids was dipotassium orthophthalate which is stabilized by sodium silicate. The findings of the experimental work are that the fluid is quite stable under forging conditions and that the decomposition products are benzene and acetic acid. A proposed reaction from reactants to products has been proposed. The findings of benzene and acetic acid in the products challenges the claims for environmentally friendliness of this product.

scholarly journals Decomposition of asbestos materials using fluoride wastes

2021 ◽  
Vol 1205 (1) ◽  
pp. 012018
Author(s):  
K Necasova ◽  
P Buchta ◽  
I Chromkova ◽  
T Stanek ◽  
T Simbera
Keyword(s):  
Hydrofluoric Acid ◽  
Material Industry ◽  
Mass Analysis ◽  
Decomposition Products ◽  
Metallic Material ◽  
Chemical Decomposition ◽  
X Ray ◽  
Ecological Stress ◽  
Main Decomposition ◽  
Production Technologies

Abstract Asbestos is one of the materials causing ecological stress. Due to its health harmfulness, an effective, ecological, and economic decomposition is highly desirable. One of the decomposition possibilities is a chemical decomposition, which could compete with commonly used thermal decomposition. The chemical decomposition can be accomplished both with the use of pure chemicals and waste chemicals from production technologies. This work deals with the use of technological wastes containing hydrofluoric acid or fluorides. Fluorides release hydrofluoric acid in the acid medium, which acts as the main decomposition medium. The source of fluorides was waste from the glass and metallic material industry. The efficiency of degradation processes was studied by mass analysis. Materials and decomposition products were characterized by X-ray powder diffraction.

Stabilizing pyritic material

1989 ◽  
Vol 4 ◽  
pp. 244-248 ◽  
Author(s):  
Donald L. Wolberg
Keyword(s):  
Significant Contribution ◽  
Organic Materials ◽  
Sedimentary Rocks ◽  
Iron Sulfides ◽  
Decomposition Products ◽  
Iron Minerals ◽  
Pyrite Formation ◽  
Organic Sediments ◽  
Freshwater Environments

The minerals pyrite and marcasite (broadly termed pyritic minerals) are iron sulfides that are common if not ubiquitous in sedimentary rocks, especially in association with organic materials (Berner, 1970). In most marine sedimentary associations, pyrite and marcasite are associated with organic sediments rich in dissolved sulfate and iron minerals. Because of the rapid consumption of sulfate in freshwater environments, however, pyrite formation is more restricted in nonmarine sediments (Berner, 1983). The origin of the sulfur in nonmarine environments must lie within pre-existing rocks or volcanic detritus; a relatively small, but significant contribution may derive from plant and animal decomposition products.

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