硅藻土对水相中Pb~(2+)的吸附

研究了吉林长白硅藻土吸附水相中Pb2+的吸附过程,讨论了各试验因素对吸附效果的影响·实验结果表明:吉林长白硅藻土对Pb2+有较好的吸附效果·该吸附过程进行得很快,在5min左右就达到吸附平衡·与酸性条件下的吸附效果相比,pH=6 5时的吸附效果最佳·温度对吸附效果影响不大·吸附过程中吸附剂用量少,对100mL铅离子质量浓度为50mg/L的溶液,0 4g的硅藻土就可以使Pb2+去除率达到98%·经过硅藻土二次吸附后,铅离子去除率接近100%·     

硅藻土对锌离子的吸附特性

研究了吉林长白硅藻土吸附水相中锌离子的吸附过程,讨论了各试验因素对吸附效果的影响·实验结果表明:吉林长白硅藻土对Zn2+有较好的吸附效果·该吸附过程进行得很快,10min左右即可达到吸附平衡·与酸性条件下的吸附效果相比,pH在中性条件下的吸附效果更佳·温度对吸附效果影响较大·对锌离子质量浓度为9 8mg/L的溶液,硅藻土用量为10g/L时Zn2+的去除率达到99 71%·经过硅藻土二次吸附后,锌离子去除率接近100%·经扫描电子显微镜的测定,硅藻土的表面圆筛形微孔是Zn2+的主要吸附位·     

改性红辉沸石对重金属离子铅的吸附性能研究

本文研究了产于广西资源县车田乡的红辉沸石对重金属离子铅的吸附性能,考察了铅离子溶液的pH值、温度、吸附时间、吸附剂用量等因素对吸附率的影响。实验研究初步得出红辉沸石对铅离子的最佳吸附条件为:25℃,pH=5.0~6.0即弱酸条件,吸附时间为2.5h,当铅离子浓度为100 mg/L,沸石投加量为1.0g,其吸附率为92%~93.5%;用H2SO4改性沸石后对铅离子的吸附率和吸附容量影响有较大提高,平均吸附容量达2.271mg/g,经过再生实验结果仍然具有较高的吸附率。     

硅藻土对诺卡氏菌的吸附作用

研究了吉林长白硅藻土吸附水相中诺卡氏菌的吸附过程,讨论了吸附时间、硅藻土用量、溶液初始pH值和吸附温度等实验条件对吸附效果的影响·实验结果表明,硅藻土对水相中的诺卡氏菌具有较好的吸附效果·该吸附过程进行得较快,在20min左右即可达到吸附平衡;在溶液初始pH值为7 0～9 0内都有较好的吸附效果;温度对吸附过程的影响不大,室温条件下操作即可;在诺卡氏菌浓度一定的条件下,适量增加硅藻土用量可以提高吸附效果·扫描电镜分析结果表明,硅藻土表面的微孔和诺卡氏菌表面的菌丝可能是吸附过程的主要吸附位·     

碳纳米管负载离子液体对铜离子吸附研究

采用浸渍法将手性离子液体1-乙基-3-甲基咪唑L-酒石酸盐(EMIML-Tar)负载到羧基化多壁碳纳米管(CNTs)上,对水溶液中Cu~(2+)进行吸附,考察了离子液体加入量、EMIML-Tar/CNTs吸附剂用量、Cu~(2+)初始浓度、pH、吸附温度、吸附时间对吸附性能的影响。结果表明,负载离子液体后能显著提高多壁碳纳米管对Cu~(2+)的吸附能力,当Cu~(2+)初始浓度为20 mg/L,吸附剂用量为25 mg,溶液pH为6.0,吸附温度为298 K,吸附时间为30 min时,EMIML-Tar/CNTs吸附剂对Cu~(2+)去除率达96%,吸附量为19.19 mg/g。应用2种动力学模型对吸附过程进行拟合,结果表明吸附过程可以很好地用准一级动力学方程描述。     

改性柚子皮对镉离子的吸附及动力学研究

以生物质废弃物柚子皮为原料对工业废水中的镉离子进行吸附.考察金属离子初始浓度、吸附剂用量、溶液pH、吸附温度和吸附时间对镉离子的吸附情况,从而确定最佳的吸附条件,并对吸附性能进行动力学研究.结果表明,吸附温度为25℃、溶液pH=5、吸附剂的用量为7 g·L^-1、吸附时间为120 min、镉离子的初始浓度100 mg·L^-1条件下,柚子皮对镉离子的吸附率达到96.45%以上;通过用准一级动力学模型和准二级动力学模型进行数据拟合,结果显示吸附反应符合准二级动力学方程;红外光谱结果显示,参与吸附反应的主要官能团为羟基、羰基和羧基.     

高岭土对废水中镍离子的吸附行为的研究

研究高岭土对废水中的镍离子的吸附性行为,探索镍离子溶液的初始浓度、pH值、高岭土的用量、吸附时间及吸附温度等因素对镍离子吸附性能的影响。结果表明:镍离子浓度增加,高岭土对其吸附率减小,而随着高岭土用量的增加,则吸附率不断提高。高岭土对镍离子的等温吸附服从Freundlich方程式。高岭土对镍离子的吸附率随温度的升高、时间的增加而增大。室温下,0.3 g高岭土对25 mL 120 mg.L-1镍离子在pH为11.98时静止吸附40 min,吸附率可以达到99.48%,高岭土能有效除去溶液中的镍离子。     

生物膜的驯化及其对废水中铅离子的吸附

为提高生物膜对重金属离子的吸附性能,在不同温度、pH和不同浓度的不同驯化剂(铁离子、锰离子、羧甲基壳聚糖)存在条件下分别驯化生物膜,并对比生物膜对水体中铅离子的耐受性和吸附性.实验表明:驯化剂羧甲基壳聚糖好于锰离子,锰离子好于铁离子;当t=22℃、pH=6.5时,0.2g/L羧甲基壳聚糖驯化的生物膜对铅离子的吸附量达到最大,去除率高达98.3%;Langmuir和Freudlich吸附等温线均能很好地描述生物膜对铅吸附的热力学过程,Elovich方程和双常数速率方程能较好地拟合吸附的动力学过程.     

纳米MnO_2负载硅藻土对苯酚废水的吸附性能研究

文章以乙酸锰和柠檬酸为原料,采用溶胶-凝胶法分别制备了纳米MnO_2和纳米MnO_2负载的硅藻土。采用X-ray衍射(X-射线diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)、N2吸附-脱附等对所制备的纳米MnO_2和纳米MnO_2负载硅藻土进行表征。以所制备的纳米MnO_2负载硅藻土为吸附剂,以初始质量浓度为100mg/L的模拟废水中苯酚去除率为主要考察指标,确定了较适宜的吸附工艺条件如下:吸附温度为25℃、吸附时间为100min、体系pH值为2、吸附剂用量为0.6g/L。该条件下的重复实验显示废水中苯酚的平均去除率达85.63%;吸附热力学结果表明,纳米MnO_2负载硅藻土对苯酚废水的吸附等温线符合Langmuir方程,其饱和吸附量为207.039 3mg/g。     

海藻酸钙纤维状干凝胶吸附铅离子的研究

对比研究了冷冻干燥海藻酸钙纤维状和球状干凝胶对铅离子的吸附作用,考察了溶液初始pH和温度对海藻酸钙纤维状干凝胶吸附铅离子的影响。结果表明,海藻酸钙纤维状干凝胶在相同铅离子浓度下的吸附性能优于球状干凝胶,其吸附速率也明显大于海藻酸钙球状干凝胶。利用Langmuir等温吸附式计算出海藻酸钙纤维状干凝胶在60°C下和pH为5.0时的铅离子最大吸附量为417mg/g。     

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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