Fe_3O_4水基磁流体的合成及其在油田污水处理中的应用

采用反滴加-化学共沉淀法,以Fe Cl3·6H2O和Fe SO4·7H2O为原料、H2O为基液、Na OH为沉淀剂、聚乙二醇(PEG)为表面活性剂合成Fe3O4水基磁流体,通过正交实验优化,得到最适宜的反应条件。通过XRD、AGM、TEM、TGDSC等对磁性纳米粒子进行表征。结果表明:当Fe3+和Fe2+的浓度为0.3 mol·L-1、n(Fe3+)/n(Fe2+)为1.5、体系p H值为12、反应温度为50℃、反应时间为60 min、PEG质量浓度为60 g·L-1时,产品的粒度平均为31.98 nm,饱和磁强度平均为55.82 emu/g;水基磁流体与聚铝、聚丙烯酰胺复配使用,结合磁分离装置,净水效果和处理效率明显提高,处理后的污水油含量小于1 mg·L-1,除油率可达99%,悬浮物含量降至3 mg·L-1以下,水质达到回注A级标准。     

化学沉淀法处理高氨氮模拟废水的研究

利用沉淀剂Mg Cl2和Na2HPO4,以磷酸铵镁的形式去除高浓度氨氮模拟废水中的NH4+,考察了p H值、Mg∶N摩尔比对氨氮和无机磷去除率的影响,并对产物进行了电镜扫描(SEM)、傅里叶变换红外光谱(FTIR)表征。结果表明:当p H值为9.0~9.2,n(Mg2+):n(NH4+):n(PO43-)摩尔比为1.1∶1∶1时,氨氮去除率和无机磷去除率可分别达到96.64%和95.55%,产物为斜方形结构的磷酸铵镁沉淀。可见,化学沉淀法能够满足氨氮高去除率的要求,方便后续进一步的生化处理,同时,沉淀产物可用作氮肥,降低废水的处理成本。     

沉淀剂对制备纯相δ-FeOOH的影响

在室温和EDTA存在的条件下,氧气氧化Fe(OH)2制备纯相的δFeOOH,只能选用碱比(R)小于0.500的NaOH为沉淀剂.实验以R均大于0.625的沉淀剂NH3·H2O,Na2CO3及NH4HCO3分别取代NaOH,得到了不同的pH值变化趋势及产物.结果表明,在一特定条件下,沉淀剂的R对制备纯相非晶态δFeOOH起关键的作用.     

甲醇脱氢制甲醛反应中碱金属难熔盐的催化性能研究

在16 mm陶瓷管固定床反应器中考察了甲醇脱氢制无水甲醛反应中几种含钠化合物及碱金属难熔盐的催化活性,表明陶瓷管也可做甲醇脱氢反应器;碱金属碳酸盐大都具有一定的催化活性,催化性能排序为:Na2CO3>K2CO3>Cs2CO3>Li2CO3,即含钠盐的催化活性较其它碱金属要高;钠的卤化物及硫化物的催化活性很低;钠的含氧酸盐在反应中的催化性能表现各异,其中Na2CO3、Na2B4O7和Na2MoO4的催化性能最好。     

优质CuNiLDH的制备及结构分析

以Cu(NO3)2·3H2O、Ni(NO3)2·6H2O和Al(NO3)3·9H2O为原材料,Na2CO3-NaHCO3为缓冲溶液,Na2 CO3为沉淀剂,采用水热法制备了优质的CuNiLDH.研究结果表明:当水热反应温度为180℃、反应时间为120 h时制得的CuNiLDH晶体最优.用X-射线衍射(XRD)、透射电镜...     

高活性非选择性油脂加氢催化剂的制备

考察了载体、分散剂、沉淀剂及其添加方式、活性组分前体和预还原等因素对油脂加氢催化剂活性的影响，比较了进口催化剂和各种方法制备的催化剂的加氢活性，筛选出高活性非选择性油脂加氢催化剂的制备方法，以硅藻土和Al2O3为载体，氧化镍为前体，Na2CO3和Na2SiO3为沉淀剂，采用把镍盐加入到沉淀剂中的中和方法，经预还原后用硬化油保护，制得的催化剂活性好于进口催化剂，加入一定量的碱性助剂，可以提高催化剂的抗皂化能力。     

海藻酸钠-腐殖酸钠吸附法处理重金属废水的研究

从海藻中提取海藻酸钠,并与腐殖酸钠联用处理含Cd(Ⅱ)、Cu(Ⅱ)重金属的废水,通过改变海藻酸钠-腐殖酸钠水处理剂投加量及溶液pH值、搅拌时间等因素的实验分析,研究了该处理剂对Cd(Ⅱ)和Cu(Ⅱ)的去除效果.结果表明,该处理剂能有效地去除Cd(Ⅱ)和Cu(Ⅱ)等重金属离子,Cd(Ⅱ)去除率大于95.6%,Cu(Ⅱ)去除率大于99.6%.     

基于絮体循环利用的印染废水生化出水深度处理研究

印染废水生化出水仍需深度处理才能实现回用.将自制的具有反应性能的有机-无机复配絮凝剂和兼具絮凝与氧化性能的无机复合絮凝剂,分别采用絮体回用方式多批次深度处理印染废水生化出水,可将废水色度降至10倍,并使絮凝剂的投加量和絮凝产泥量比传统絮凝方式减少50%,对化学需氧量(CODcr)的去除效果比传统絮凝方式提升5%—10%,絮体回用次数可达10次.有机-无机复配絮凝剂复配粉末活性炭后,采用絮体回用方式处理印染生化出水,可使絮凝剂投加量和絮凝产泥量再减少50%,絮体回用次数可达15次以上.     

阴-非离子表面活性剂复配修复石油污染的土壤

采用阴离子表面活性剂SDS与非离子表面活性剂OP-10复配在振荡和超声2种条件下淋洗修复土壤.实验结果表明:超声淋洗比振荡淋洗好,且去除率与溶液浓度、pH、液固比、温度和淋洗时间成正相关,淋洗的最佳条件是:SDS和OP-10复配溶液(复配质量比为50∶1)质量浓度为5 g/L,pH为7,液固比为20 mL/g,温度为25℃,超声淋洗30 min,或者振荡淋洗2h.无机盐离子对去除率也有影响,CaCl2,KCl和NH4Cl对SDS/OP-10溶液的复配淋洗有消极影响,Na2CO3,Na2SiO3对淋洗有积极影响,而NaCl对淋洗影响不大.     

KY-3型聚合物处理黄河原水的研究

研究了 KY- 3型阳离子聚合物与无机聚合物复配进行黄河原水的絮凝处理 ,结果表明 :KY- 3型聚合物对无机聚合物有较强的增效作用 ,黄河原水为常温低浊或低温低浊时仍有增效作用 .     

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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