气体放电对SO2和SO32－氧化的影响

研究气体放电对SO2和亚硫酸盐氧化的影响,采用了直流电源和交直流叠加电源进行气体放电.结果表明,气体放电对于SO2氧化促进作用很少;但对溶液中的SO32－的氧化则有明显促进作用.通过对两个反应过程的机理分析,认为亚硫酸盐溶液氧化快是因为气体放电产生的OH等自由基和液相里的亚硫酸根起作用,引发链反应,促进了溶液中四价硫被空气中的O2氧化为六价硫的过程.而气相中的SO2与OH等自由基作用不能形成链反应,所以影响不明显.实验表明,选择交直流叠加电源进行气体放电比用纯粹直流电源放电效果更好.     

气体放电法氧化高浓度亚硫酸盐

使用气体放电等离子体对较高浓度的亚硫酸钠进行氧化,在不同电压和频率条件下进行了实验.发现在很低的功耗下,取得了很好的氧化效果.使用交直流叠加电源,亚硫酸钠的转化率随着交流电压的升高而升高.在一定的频率范围内,改变频率对亚硫酸钠的转化率影响不大.     

流光放电等离子体液相氧化亚硫酸铵

在氨-硫铵法烟气脱硫中, 一个关键环节是将副产物的四价硫S(IV)氧化为六价硫S(VI). 采用可规模化的流光放电液相氧化技术, 通过交直流叠加(AC/DC)电源, 激发气体放电产生等离子体对氨法脱硫高浓度的亚硫酸铵进行氧化. 实验测量了该氧化过程与溶液浓度、放电功率密度、溶液pH值、温度以及传质效率因子等各种参数的关系. 研究表明, 在亚硫酸铵摩尔浓度为3 mol·L-1时, 可以获得有实用价值的反应速率, 摩尔能耗减低到50 Wh·mol-1以下, 显示出很好的应用前景.     

脉冲放电等离子体对La2O3催化剂组成的影响

 选用稀土La2O3催化剂对CO进行了催化还原脱硫反应. 考察了在脉冲放电等离子体协同催化作用下,催化剂组成随反应温度和放电电压的变化规律以及其与常规催化作用下的不同之处. 结果表明,反应温度较低(＜377 ℃)时,脉冲放电等离子体对催化剂组成的影响作用明显; 反应温度较高(＞377 ℃)时,脉冲放电等离子体仅影响催化剂各组分的含量. LaOOH的生成是La2O3催化剂活性组分生成的关键步骤,并受温度的影响较大; 存在一最佳放电电压效应.     

离子色谱法同时测定脱硫海水中的SO_4~(2-)和SO_3~(2-)

采用离子交换色谱法同时定量分析脱硫海水中SO_4~(2-)和SO_3~(2-)。0.01 mol/L EDTA和0.10×10~(-3) mol/L NaOH混合溶液用于除去海水样品中Ca~(2+)、Mg~(2+)干扰,加入0.5%的甲醛溶液防止SO_3~(2-)氧化为SO_4~(2-)。实验采用DINOEX AS-9HC阴离子交换柱作分离柱,以9.00×10~(-3) mol/L Na_2CO_3溶液为淋洗液,电导检测器检测。方法线性范围为5.00~100.00 mg/L,加标回收率为97.85%~103.99%,相对标准偏差(RSD)为0.20%~2.07%。SO_3~(2-)的检出限为0.03mg/L,SO_4~(2-)的检出限为0.04mg/L。结果表明,本方法可以有效消除海水中Ca~(2+)、Mg~(2+)对低浓度SO_3~(2-)、SO_4~(2-)测定的干扰,可同时实现海水脱硫体系中SO_3~(2-)、SO_4~(2-)的定量分析。     

(SO_2,N_2)气体中脉冲放电SO发射光谱测量实验研究

采用ＳＯ２、Ｎ２混合气体和纳秒级脉冲电源在常温、常压下测量了ＳＯ２产生的碎片ＳＯ（Ａ→Ｘ）发射光谱,从微观上研究了ＳＯ２的去除过程,为脉冲电晕放电烟气脱硫的深入研究提供了实验依据．     

固体超强酸NiO-ZrO_2/SO_4~(2-)的合成及其对葡萄糖电催化氧化的研究

制备了固体超强酸NiO-ZrO2/SO42-,并研究了其对葡萄糖的电催化氧化性能。利用X射线衍射、扫描电镜以及傅里叶变换红外光谱法对其进行表征,同时研究了其对葡萄糖的电催化氧化性能。结果表明:起主要催化作用的为NiO-ZrO2/SO42-中镍的活性物质,而ZrO2/SO42-上的缺电子金属中心加速了反应过程中电子的转移速率,使得NiO-ZrO2/SO42-相比于NiO/SO42-有更低的峰电位,并且表现出更好的稳定性。     

微波法制备SO_4~(2-)_/TiO_2催化剂及其光催化氧化性能

采用微波法、混合加热法和常规加热法制备 SO_4~(2-)/TiO_2催化剂 ,运用 XRD、 BET、 DRS及 LRS光谱测定等技术对催化剂的结构进行了表征 ,并以光催化降解 C2H4为模型反应考察了不同制备方法对催化剂的光催化氧化反应性能的影响 .研究结果表明 ,微波法制备的 SO_4~(2-)/TiO_2催化剂的光催化氧化性能得到明显改善 ,对乙烯转化率为 80％ ,而混合加热法和常规加热法制备的样品乙烯转化率分别为 58％和 41％ .微波辐射制备的催化剂锐钛矿相含量高、比表面积大 ,光吸收阈值增大;并且拉曼散射光谱向低波数方向移动 ,有助于增加光致电子的跃迁几率 ,提高多相光催化过程的本征量子效率 .     

脉冲电晕放电下的甲烷氧化偶联反应(英文)

研究了在常温,常压及惰性气体稀释的条件下,用脉冲电晕放电进行的甲烷氧化偶联（OCM）反应。在各种实验条件下,产物CZ烃由一6o／o乙烯,－70rk乙烷和一87％乙炔组成。甲烷的转化率及CZ烃的生成速率依赖于反应气中甲烷与氧气的比值,它们的流速及直流电源的电压等n通过调节这些实验条件,甲烷转化为C4烃的转化率可得到优化,在45kV高压,30ml。／min的流速下（反应气体组成为95％CHn与50／0O2）,CZ烃的最高选择性可达85O／O。当反应气体组成为80％CH4和20O／oOZ时,甲烷的最高转化率达23％。在间歇式反应器中,甲烷转化率随反应时间增长而提高,反应75分钟时甲烷转化率达7lO／O,而CZ烃的产物分布,尤其是乙炔的含量随反应时间增长而明显降低,这些实验结果支持了文献中提出的ZCH4～CZH6—CZH4～CZHZ～CO／COZ反应历程。     

褪色光度法测定SO_3~(2-)的研究

本文研究了ＳＯ２－３褪色碱蓝６Ｂ的反应，在ｐＨ５．２ＨＡｃ－ＮａＡｃ缓冲介质中，ＳＯ２－３浓度在０．３９～１２ｍｇ／Ｌ范围内符合比尔定律，仅Ｆｅ３＋、Ｎｉ２＋、Ｃｒ３＋干扰测定，用于食品中ＳＯ２－３的测定，结果令人满意。     

The Dependence of Gliding Arc Gas Discharge Characteristics on Reactor Geometrical Configuration

The dependence of gliding arc gas discharge characteristics, including gas flow field, arc column motion and volatile organic compounds (VOCs) decomposition performance, on reactor configuration parameters was investigated based on numerical simulation and laboratory experimental findings. For a given supply voltage (10 kV) and a certain nozzle outlet diameter (1.5 mm), increasing the electrodes gap (1–4 mm) or decreasing vertical distance between electrode throat and nozzle outlet (25–10 mm) will increase the gas flow rate through the electrode throat, the gas velocity in the plasma region, the arc column velocity, the maximum attainable position of the arc column and the electrical power consumption, also, higher VOCs decomposition rate and lower specific energy requirement are observed according to the n-butane and toluene decomposition experiments.     

Novel AC and DC Non-Thermal Plasma Sources for Cold Surface Treatment of Polymer Films and Fabrics at Atmospheric Pressure

Novel types of non-thermal plasma sources at atmospheric pressure based on multi-pin DC (direct current) diffusive glow discharge and AC (alternative current) streamer barrier corona have been elaborated and tested successfully for cold surface treatment of polymer films [polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET),] and polyester fabric. Results on physical properties ofdischarges mentioned and output energy characteristics of new plasma sources as well as data on after-treatment changes in wettability of films and fabrics are presented. The main goal of this study was to find out the experimental conditions for gas discharge and surface processing to achieve a remarkable wettability change for a short treatment time.     

Decomposition of Gaseous Sulfide Compounds in Air by Pulsed Corona Discharge

The effectiveness of applying a pulsed corona discharge to the destruction of olfactory pollution in air was investigated. This paper presents a comparative study of the decomposition of three representative sulfide compounds in diluted concentrations: hydrogen sulfide (H₂S), dimethyl sulfide (DMS), and ethanethiol (C₂H₅SH), which could be completely removed when a sufficient but reasonable energy density was deposited in the gas. DMS showed the lowest energy cost (around 30 eV/molecules); C₂H₅SH and H₂S had an EC of respectively 45 eV and 115 eV. The efficiency of the non-thermal plasma process increased with decreasing the initial concentration of sulfide compounds, while the energy yield remained almost unchanged. SO₂ was the only identified byproduct of H₂S decomposition, but the sulfur balance suggests the formation of undetected SO₃. The byproducts analyzed during the degradation of DMS and C₂H₅SH enabled to propose a reaction mechanism, starting with radical attack and breaking of C–S bonds.     

单柱离子色谱法测定纸浆滤液中SO4^2—,S2O3^2—

采用单柱离子色谱法对纸浆滤液中的有害离子SO_4~(2-)、S_2O_3~(2-)进行测定.用lmmol·L~(-1)柠檬酸钠溶液作为淋洗液,在6min内完成分离测定.有良好的线性关系和重现性.标准回收率分别为99.82%和98.48%,共存离子基本不干扰测定.     

BrO_3~--SO_3~(2-)-H~ -KMnO_4系pH振荡反应

在ＢｒＯ 3~－-ＳＯ_３~（２－）-Ｈ~＋-ＫＭｎＯ_４振荡体系的基础上,通过改变反应参数,研究了对体系振荡现象的影响,发现了一些新的现象,如颜色的振荡,无沉淀的高ｐＨ值稳态及沉淀的生成等,并结合我们的实验对现象进行了解释,对前人提出的机理进行了改进,在此基础上绘制了ＫＭｎＯ４的浓度对ＣＳＴＲ的总流量的相图（［ＫＭｎＯ４］－Ｋｆ）     

The determination of 2,6-diamino-9-(2-hydroxyethoxymethyl)-9H-purine (A134U) and 2-amino-9-(2-hydroxyethoxymethyl)-9H-purine (A515U) in human plasma and urine by gas chromatography

Summary A novel, sensitive and selective automated method for the analysis of low concentrations of A134U and A515U in human plasma and urine has been developed. It involved extraction of the drugs (with an internal standard) from urine or plasma and conversion to trimethylsilyl derivatives. The trimethylsilylated extract was then chromatographed using a temperature programmed injection cycle on a gas chromatographic column packed with 5% OV17 on Chromosorb W-HP. Components were detected by an alkaline flame-ionisation detector. BASIC computation capability was utilised for both control of the autosampler and calculation of the results using a linear regression calibration of the standards used. Automation allowed 48 injections per 24 hours. Samples were routinely assayed in duplicate with a range of spiked standards and a control sample. The assay was linear for plasma and urine in the range 0.5–200 μM with no interference from acyclovir, known metabolites, endogenous compounds, or a specific inhibitor [erythro-9-(2-hydroxy-2-nonyl) adenine (EHNA)]. The method had a sensitivity of less than 0.5μM. It has been applied successfully to clinical studies. Presented at the 15th International Symposium on Chromatography, Nürnberg, October 1984     

彩色套药生产流程中S_2O_3~(2-)、SO_3~(2-)在线分析法研究

提出了一种S_2O_3~(2-)和SO_3~(2-)生产流程在线分析方法,方法简便,连续采样、连续测定、浓度范围250～550 g/L,响应时间98 s,1.5 h漂移<0.15。