膨润土负载纳米铁去除水中甲基橙的研究

采用了液相还原法制备膨润土负载纳米铁,分别考察了膨润土、纳米铁和负载纳米铁对1L、100mg/L的甲基橙溶液的去除率,并探讨了时间、pH值、投加量、温度等对负载纳米铁去除水中甲基橙的影响.结果表明:在投加量为1.00g/L、60r/min、30℃、pH为6.00的条件下,负载纳米铁去除水中甲基橙在前20 min时效果最...     

凹土负载零价铁去除水中Cr(Ⅵ)的研究

以FeC12·4H2O和NaBH4为原料,凹土为载体,采用液相还原法制备凹土负载零价铁,并用扫描电子显微镜(SEM)及X射线衍射(XRD)进行表征.考察了Cr(VI)溶液初始浓度,pH,凹土负载零价铁投加量及反应时间等条件对Cr(VI)去除效果的影响.结果表明,Cr(VI)的去除率随反应时间和凹土负载零价铁投加量增加而升高,而随pH和Cr(VI)溶液初始浓度升高而降低;凹土负载零价铁对Cr(VI)的还原去除基本符合伪一级反应动力学模型.凹土负载零价纳米铁Cr(VI)的良好去除效果表明其在地表水原位修复领域具有较好的应用前景.     

膨润土负载纳米铁钯去除水中酸性大红3R的研究

采用液相还原法制备天然膨润土负载纳米铁钯双金属颗粒,考察了不同材料及影响因素,如溶液温度、pH值等对水中酸性大红去除的影响.实验结果表明:负载型纳米铁钯表现出更高的活性,对高浓度的酸性大红具有良好的去除效果.在投加量为0.5 g.L-1、250 r.min-1、30℃、pH=5.81、ρ0=200mg.L-1条件下,天然膨润土负载纳米铁钯在10 min内对酸性大红的去除率达到98.48%.其降解过程较好地符合伪一级反应动力学(r≥0.983),反应活化能为75.42 kJ.mol-1.     

碳纤维负载零价铁的制备及其去除水溶液中的六价铬

以碳纤维作为载体,采用电沉积法制备碳纤维负载零价铁( PCF-ZVI),利用扫描电镜、能谱仪及X射线衍射仪对其进行了表征,并考察了其对水溶液中Cr(VI)的去除效果.实验结果表明：碳纤维负载零价铁对水溶液中的Cr(VI)具有很好的去除效果.当铁碳质量比为2：1,投加量(以Fe0计)为2 g·L-1,Cr(VI)初始质量浓度为20 mg·L-1,pH值为5,反应时间40 min后,Cr(VI)的去除率可达99.96%,碳纤维上负载的零价铁对Cr(VI)的还原过程为准一级动力学,并且还原速率与反应温度的关系符合Arrhenius定律,反应活化能为20.683 kJ·mol-1.     

镁基污泥炭催化臭氧氧化去除废水中偶氮染料特性研究

采用金属镁和污泥炭制备出镁基负载污泥炭材料并被作为臭氧催化剂,以偶氮染料橙黄II废水作为目标污染物,探究了催化剂投加量等因素对橙黄II降解率的影响。结果表明:使用体积为100 mL的橙黄II废水,在污染物橙黄II初始浓度为100mg/L,向水中通入的臭氧量为500mg/h,加入镁基负载率为5%的催化剂0.5 g,反应温度为25℃,废水pH为5时,反应12 min时去除率达99%。镁基催化臭氧氧化对橙黄II的去除效果较单独臭氧高,镁基负载污泥炭的存在,增加了臭氧与催化剂的接触,同时激发了臭氧分解产生的羟基自由基,从而促进废水中污染物的快速降解,为臭氧氧化染料废水提供了有效催化材料。     

纳米零价铁－双氧水协同提升甲硝唑矿化率的研究

尽管纳米零价铁（nZVI）能够有效地去除甲硝唑(MNZ),但是仍然存在矿化率低的问题. 本文,合成了纳米零价铁,研究了H2O2投加量对甲硝唑及其总有机碳（TOC）去除的影响. 结果表明,在nZVI和H2O2的共同作用下不仅可以进一步加速甲硝唑的去除速率,而且其TOC的去除率也明显提高.当双氧水投加量为0.55g/L,TOC的去除率为45.87%,约为单独纳米零价铁的18倍. 相同反应条件下,与传统芬顿法相比,nZVI/H2O2体系下甲硝唑及其TOC去除率,分别约为Fe2+/H2O2芬顿体系的1.5倍和7.1倍. 因而,双氧水与纳米零价铁协同作用,不仅进一步加速了纳米零价铁对甲硝唑去除速率,而且还有效地提高了有机物的矿化率.     

沸石—纳米零价铁复合材料对铀的吸附性能研究

通过液相还原法制备出纳米零价铁,将它负载于沸石表面制成负载型纳米零价铁复合材料(Z-n ZVI).采用扫描电镜法(SEM)和BET法对材料进行了表征,考察了不同的温度、反应时间、U(VI)初始浓度、样品投加量对该材料对U(VI)去除效果的影响.结果表明:纳米零价铁颗粒均匀的分布在沸石的表面上,其粒径在40~80 nm左右;在p H为4.5,温度为30℃,接触时间为60 min,样品投加量为0.5 g/L条件下,U(VI)的去除率和吸附容量达到96.7%和48.5 mg/g.该复合材料对水溶液中的U(VI)有较好的去除效果,有望在实际应用中解决含铀废水难以处理的问题.     

铁碳微电解处理印染废水的研究

采用铁碳微电解法对金橙G模拟印染废水进行预处理,研究影响铁碳微电解处理废水的各种因素.实验探讨溶液浓度、初始pH值、铁碳比及反应时间对废水COD(化学需氧量)及色度去除率的影响,以确定最佳工艺条件.结果表明:铁碳微电解法预处理染料废水的最佳初始pH值为2,最佳铁碳比1 ∶ 1,适宜的反应时间为60 min,此时,COD...     

纳米铁材料对小鼠肺灌洗液中白细胞和羟脯氨酸的影响

小鼠采用非暴露式气管内注人法注入不同浓度纳米铁颗粒物悬液,在第10 d处死小鼠,并进行肺泡灌洗,测定肺泡灌洗液(BALF)中各项指标、肺脏器系数.纳米铁10 mg·kg-1bw-1组肺脏器系数、白细胞数目和羟脯氨酸含量均高于对照组和纳米铁1 mg·kg-1bw-1组,差异显著(P<0.01或P<0.05),在本实验条件下,纳米铁对小鼠肺造成急性损伤作用,对生物体健康构成潜在威胁,为研究纳米铁对人体及环境的潜在影响奠定实验基础.     

凹凸棒土负载纳米Fe/Ni的制备及其去除水中Zn(Ⅱ)性能研究

采用液相还原法制备以凹凸棒土为载体的纳米双金属Fe/Ni复合材料,通过Zn(Ⅱ)静态吸附试验,确定了除Zn(Ⅱ)效果最佳的Fe/Ni@ATP复合材料,即纳米铁与凹凸棒土的负载比为1∶2、Fe/Ni双金属中Ni掺杂比为2%,并考察了Zn(Ⅱ)初始浓度、pH及环境温度对该复合材料去除水中Zn(Ⅱ)效果的影响。结果表明,经过凹凸棒土负载和掺杂Ni改性以后,Fe/Ni@ATP复合材料的Zn(Ⅱ)去除率显著提高,颗粒团聚状况得到改善,比表面积明显增加。在实验条件范围内,较高的溶液pH值、环境温度以及较低的Zn(Ⅱ)初始浓度均有利于Fe/Ni@ATP复合材料对Zn(Ⅱ)的去除。该过程符合Langmuir吸附等温模型,吸附机理为零价铁表面氧化物与Zn(Ⅱ)的配合作用,此外,水中Zn(Ⅱ)也可以通过生成Zn(OH)_2沉淀的形式去除。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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