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Catalytic oxidation effect of MnSO_(4) on As(Ⅲ) by air in alkaline solution

Journal of Environmental Sciences 2023年第4期126卷 644-655页

作者： Yuhu Li Yudong Yang Ruixiang Wang Zhifeng Xu Guizhong Jin Chengyong Jin Faculty of materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China Hsikwang Shan Twinkling Star Co.Ltd. Lengshui Jiang 417500China

The catalytic oxidation effect of MnSO_(4)on As(Ⅲ) by air in an alkaline solution was investigated.According to the X-ray diffraction (XRD),scanning electron microscope-energy dispersive spectrometer (SEM-EDS) and X-ray photoelectron spectroscopy (XPS) analysis results of the product,it was shown that the introduction of MnSO_(4)in the form of solution would generate Na_(0.55)Mn_(2)O_(4)·1.5H_(2)O with strong catalytic oxidation ability in the aerobic alkaline solution,whereas the catalytic effect of the other product MnOOH is not satisfactory.Under the optimal reaction conditions of temperature 90℃,As/Mn molar ratio 12.74:1,air flow rate1.0 L/min,and stirring speed 300 r/min,As(Ⅲ) can be completely oxidized after 2 hr reaction.The excellent catalytic oxidation ability of MnSO_(4)on As(Ⅲ) was mainly attributed to the indirect oxidation of As(Ⅲ) by the product Na_(0.55)Mn_(2)O_(4)·1.5H_(2)O.This study shows a convenient and efficient process for the oxidation of As(Ⅲ) in alkali solutions,which has potential application value for the pre-oxidation of arsenic-containing solution or the detoxification of As(Ⅲ).

关键词： Arsenic air oxidation Catalytic oxidation Manganese sulfate

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Surface morphology-optical properties relationship in thermochromic VO_(2) thin films obtained by air oxidation of vanadium nitride

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Journal of Materiomics 2021年第4期7卷 657-664页

作者： A.C.García-Wong D.Pilloud S.Bruyere D.Mangin S.Migot J.F.Pierson F.Capon Institut Jean Lamour(UMR CNRS 7198) Universite de Lorraine54000NancyFrance

In this paper,vanadium nitride(VN)thin films have been deposited on Al substrates by reactive magnetron sputtering.Thermochromic VO_(2) films have been obtained by air oxidation of VN samples performed at three temperatures(450,525 and 550℃)at various durations(lower than 50 min).X-ray diffraction and Raman spectrometry of the VN oxidized films indicate that VO_(2) and V2O5 are the only phases produced during the oxidation process.Vanadium dioxide is the first oxide formed.It coexists with VN in a long period at 450℃ or suddenly disappears at 525 and 550℃.Whatever the temperature,V2O5 is exclusively detected after the total oxidation of VN.This oxide is detrimental to the thermochromic performance of films.The emissivity-switching properties of the oxidized films were analyzed by infrared camera in the 7.5e13 mm range.The comparison among all the samples exhibiting a thermochromic behavior shows that the maximum emissivity switch is independent of the oxidation temperature and the surface morphology of the samples.These results could open a new strategy in the investigation of VN oxidation as a method to obtain VO_(2),along with an insight into the correlation between surface morphology and optical properties.

关键词： Vanadium dioxide Vanadium nitride Thermochromism Optical properties air oxidation

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Effect of lanthanum ion implantation on oxidation behavior of zircaloy

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Journal of University of Science and Technology Beijing 2004年第3期11卷 260-262页

作者： XiaoyangLiu XindeBai DepartmentofEngineeringPhysics TsinghuaUniversityBeijing100084China DepartmentofMaterialsScienceandEngineering TsinghuaUniversityBeijing100084China

In order to investigate the effect of lanthanum ion implantation on theoxidation behavior of zircaloy at 500℃, Zircaloy specimens were implanted by lanthanum ions with adose range from 5xl0^(16) to 2xl0^(17) ions/cm^2 at room temperature, and then oxidized at 500℃ for100 min. The valence of the oxides in the scale was analyzed by X-ray Photoelectron Spectroscopy(XPS). The phase structures of the oxides in the scale were examined by Glancing Angle X-rayDiffraction (GAXRD). With the increase of implanted lanthanum ions dose, the phase structures in theoxide scale are transformed from monoclinic zirconia to hexagonal one and then to monoclinic oneagain. The measurement of weight gain showed that a similar change from the decreased gain toincreased one again is achieved in the oxidation behavior of lanthanum ion implanted zircaloycompared with that of as-received zircaloy.

关键词： zircaloy air oxidation lanthanum ion implantation hexagonal zirconia monoclinic zirconia phase transformation

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Synthesis of Highly Microporous Sulfur-Containing Activated Carbons by a Multistep Modification Process

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Journal of Wuhan University of Technology(Materials Science) 2020年第5期35卷 856-862页

作者：方楷 SHENG Jie 杨仁党 State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510641China

The sulfur-containing activated carbons(SACs)were prepared by CO2 activation and sulfur impregnation.The sulfur-containing samples were then oxidized in air.The SACs were characterized by N2 adsorption,elemental analysis,thermogravimetric analysis,X-ray photoelectron spectroscopy,Raman spectroscopy,and X-ray diffraction.The CO2 activation provided precursor carbons with high porosity,which in turn were sulfurized effectively.oxidation in air at 200℃enlarged pores and redistributed amorphous sulfur in the hierarchical pores.A typical SAC containing 17.89%sulfur exhibited a surface area of 1464 m2/g.This work may open up a valid route to prepare highly microporous SACs with high sulfur loading for applications where the presence of sulfur is beneficial.

关键词： sulfur loading micropore CO2 ctivation air oxidation porous carbons

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英文摘要

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石油与天然气化工 2012年第3期41卷 357-362页

The article presents abstracts of papers on chemical engineering of oil and gas, including a traceable calibration procedure for hydrocarbon dew point chilled mirror instruments and research direction and challenges f... 详细信息

关键词： acidizing air oxidation amine value ammonia or ammonium salt analysis anti-swelling agent anti-swelling performance anti-swelling rate anticorrosion coating ASP produced water average particle size bimodal calibration casing--damaged well catalyst cement chimney clay minerals CO2 comparison research complex gas components core damage corrosion inhibitor CPS crude sewage desulphurization determination diversion ejector energy development energy efficiency benchmarking evaluation FCC foam drainage foam mass foam stabilizer foamed acid foaming agent function design Gas field gathering pipelines H2S high temperature high-sulfur hydrocarbon dew point hydrocarbon dew point chilled mirror instruments incinerator inspection integrated equipment kinetic hydrateinhibitors LaFeO3 liquefied petroleum gas dispenser liquid loading load low permeability and low pressure LPG mechanical strength methane methane hydrates metrological verification microbial flocculant multifunctional activated acid natural gas natural gas desulfurization natural gas hydrate network management platform new technology offshore oilfield oil yield oilfield application operation operation points parameter optimization performance evaluation perovskite oxide compound plugging plugging causes analysis polymer polymer-surfactant displacement pore distribution prevention measures removal rate of solid suspensions replacement rate response of performance retarder rotating-strip-port round-port scale inhibitor scaling screening silica gel slight expansion SO2 solid-liquid separation treatment solubilization sour gas field sulfur recovery system construction tail gas treatment hydro-treating heater technical summary thermodynamics titration method traceability transport pipeline treatment technology uncertainty of measurement viscosity waste drilling fluid water content water injection water producing water sensitivity damage water-sensitivity

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