球形活性炭和球形树脂对不同VOCs的吸脱附特性研究

为探究多级鼓泡流化床吸附工艺中吸附剂的选择依据,本研究选取3种商业球形吸附剂作为实验材料,分别考察乙醇、乙酸乙酯、环己烷和二甲苯在上述吸附剂上的吸脱附行为,比较分析了吸附剂不同理化性质对吸附特性的影响。实验结果表明:吸附剂孔道结构和表面官能团都会影响吸附质的动态吸附特性,具有更大微孔容积、更小微孔分布的吸附剂对吸附质的动态吸附性能更好;吸附剂的表面官能团类型会对不同吸附质的吸附产生影响。对于实验所考察的4种吸附质,3种吸附剂在脱附温度达到160°C后均可脱附完全,符合实际应用要求。本研究工作对多级鼓泡流化床吸附工艺的开发及吸附剂的选择具有指导意义。     

壳聚糖纳米复合物的制备及对甲基橙吸附性能研究

采用简便的一步水热方法合成磁性壳聚糖纳米复合物(Fe_3O_4-CS MNPs)。用透射电子显微镜、红外光谱仪、热重分析仪、多功能振动样品磁强计对其进行了表征,并通过紫外可见吸收光谱考察了其对甲基橙染料的吸附行为。结果表明,磁性壳聚糖纳米复合物对甲基橙染料的吸附遵循二级反应动力学和Freundlich吸附模型。最大吸附量为93.84mg/g。吸附后的磁性壳聚糖纳米复合物可通过NaOH溶液进行脱附,脱附率为92.98%,且4次吸附-脱附行为后,吸附量仍能达到77.04mg/g,表明该吸附剂具有良好的循环利用能力。     

壳聚糖复合物对污水中金属离子的吸附研究

将壳聚糖(CTS)与自制的丙酮酸化壳聚糖(P-CTS)、巯基化壳聚糖(CTS-SH)作为吸附剂,研究了不同吸附剂对污染水体同一金属离子的静态吸附和动态吸附及对混合金属离子的竞争吸附.分析了pH值、温度、吸附时间对吸附量的影响,研究了流速对动态吸附和脱附的影响及洗脱剂、活化剂对吸附剂复原的作用.为用壳聚糖复合物(CTS-X)清除污染水体中金属离子作了基础研究.     

胺基化磁性壳聚糖微球对甲基橙的吸附研究

以壳聚糖为原料,通过反向悬浮聚合法制得磁性壳聚糖微球(M-CSm),再对其化学改性,制得胺基化磁性壳聚糖微球(NH2-M-CSm),用分光光度法分析其对甲基橙的吸附性能,并对吸附机理进行初步探讨.实验结果表明,该吸附剂对甲基橙的吸附受甲基橙的初始浓度、pH和温度等因素的影响.当吸附的pH在3.7左右,温度为303 K时,平衡去除率最大可达96.95%.另外对胺基化磁性壳聚糖微球的吸附脱附实验表明,在吸附、脱附3次后对甲基橙吸附率仍可以达到90%以上,可重复使用,再生性能好.     

活性炭预处理对Pd／AC催化剂上NO吸附性能的影响

通过湿法预处理的方法改变活性炭（AC）的物理结构和表面化学性质,以考察其对负载Pd催化剂上一氧化氮（N0）吸脱附的影响．活性炭经过H3PO4湿法氧化预处理后活性炭表面的微孔结构和含氧基团数量增加显著．XRD和CO化学吸附结果表明Pd原子在H。P04湿法氧化预处理的活性炭载体上具有较小粒径和较高的分散度,从而使得其在有氧条件下对NO的吸附容量高达83．9mmol／g且其脱附温度仅为150℃,与未处理活性炭所得催化剂Pd／AC相比,NO吸附量提高3．8倍,NO脱附温度降低50℃．     

改性壳聚糖吸附剂对水中低浓度汞的吸附

制备了几种改性壳聚糖吸附剂,通过优化试验确定了制备改性壳聚糖吸附剂的乙酸/壳聚糖浓度配比及固化碱液条件,并比较了不同吸附剂对Hg2+的吸附性能.以分子印迹法结合交联胺化改性法制备的Hg2+分子印迹改性壳聚糖吸附剂小球(P-C-CTS-ex(Hg0.3))对Hg2+具有最高的吸附容量,在低浓度Hg2+(CHg2+<40mg/L)溶液中,此吸附剂对Hg2+的吸附容量可达9.017 mg/g,比未改性壳聚糖(CTS)的吸附量高出1倍以上.研究还揭示了交联前Hg2+对壳聚糖分子中的活性氨基的保护功能及除Hg2+后的分子印迹作用.循环再生实验表明,P-C-CTS-ex(Hg0.3)经过8个循环以后的吸附容量保持稳定,颜色与外观等基本不变,重复使用性能稳定;而未改性CTS吸附剂经过"吸附-脱附-再生"8个循环后,球体积明显变小,颜色逐渐变黄,吸附容量不稳定.这表明本研究制备的Hg2+分子印迹改性壳聚糖吸附剂的吸附容量和再生性能均明显优于普通壳聚糖吸附剂,具有应用于含Hg废水处理的潜力.     

6^#溶剂油脱芳精制吸附剂再生技术

吸附剂的再生直接影响吸附精制工艺的成败，决定了吸附过程能耗及吸附剂寿命。对吸附过程中已被轻质芳烃饱和１３Ｘ型分子筛的再生脱附剂进行了筛选，比较。结果表明，工厂中副产Ｃ５馏分是合适的脱附剂。研究表明，温度，空速等因素对脱附效果有影响，脱附温度应于高３００℃，脱附剂空速可随工艺要求在ＬＨＳＶ变化范围０．８－１．２５ｈ＾－１内选择。     

太阳能冷管的机理与结构改进实验

阐述了对太阳能冷管及其结构和性能的研制及改进，采用真空集热方式和选择性涂层加强冷管对太阳能的吸收，以固化复合吸附剂提高吸附床的吸附和脱附性能．对冷管中的脱附动力学机理进行了实验研究，指出真空度是影响脱附速率的主要因素之一．该太阳能冷管型可以制冷又可以供热水，其制冷系数达0．193，制冷与供热的总性能系数为0．692．     

多孔硅铝酸盐的制备及吸湿性能

为满足高效旋转式除湿技术的要求,采用水热法制备硅铝酸盐吸附剂,揭示了搅拌时间对吸附性能的影响.通过N2吸附-脱附等温线和TEM、XPS、XRD和FT-IR等测试对吸附剂结构与形貌进行表征,利用动态水蒸气吸附分析仪测试吸附剂对水蒸气的吸附-脱附性能.结果表明:随着搅拌时间的延长,吸附剂的比表面积、孔容和表面硅铝原子比逐渐增大,而平均孔径逐渐减小,水汽吸附性能有所增强,且吸附剂脱附温度仅为360 K,在低湿度(RH≤40%)下的吸附性能强于3A分子筛.     

热排空法测试复合吸附剂吸附脱附性能

采用热排空法进行了复合吸附剂吸附脱附性能测试试验.该方法在不使用真空泵的情况下将空气排出,使得系统内空气分压力小于2 Pa,符合国家标准对测试试验的要求.通过测定13X沸石原粉和整体成型复合吸附剂的吸附脱附性能得出:其测试值与文献值偏差小于8%,脱附过程和吸附过程中吸附床温度变化速率较高,分别为6.7℃/min和-13.7℃/min;对各个复合吸附剂性能的测试和比对得到复合吸附剂E,其脱附性能较好,将复合吸附剂E应用于太阳能冷管中的制冷系数COP约为0.24～0.28.     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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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