贝壳粉处理重金属离子废水的研究

研究了贝壳粉加入量、溶液pH和搅拌时间对重金属离子的去除效果的影响,并通过正交试验,得出最佳条件:贝壳粉加入量为20g/L、溶液pH值为10.5、搅拌时间为2h,对Cd2+、Cu2+、Mn2+、Zn2+四种重金属离子均有较好的吸附效果.     

Fenton试剂法处理造纸废水的应用研究

用Fenton法对造纸废水进行处理研究,讨论了处理造纸废水的影响因素:pH值,H2O2的用量,Fe2+投入量, 搅拌时间,搅拌速度以及光照时间等对CODcr去除率的影响,得到最佳工艺条件:pH=6.00,H2O2(30%)的用量为8. 34 mL/L,FeSO4投入量为6.67 g/L,搅拌速度为280 r/min,紫外光照80 min后废水的CODCr去除率达85.3%,出水CODcr降到350 mg/L,达到国家造纸废水排放标准.     

电絮凝法处理电镀废水中Crn+、Cu2+、Zn2+的试验

针对电镀废水对生态环境的严重污染问题,提出了铝板作为极板的电絮凝设备处理电镀废水中的重金属离子Crn+、Cu2+、Zn2+,研究了初始pH值、电流密度、电极间距等因素对处理效果的影响.试验结果表明,在电絮凝过程中,初始pH值在4-8之间时,金属离子的去除率最好,但当初始pH值超过8时,铬的去除率有所下降;并且随着电流密...     

耐铅锌微生物对矿山酸性废水中Zn2+和pb2+吸附性能分析

以分离于某铅锌矿选矿废水排水沟土壤中的菌株T1为对象,研究重金属离子Zn和Pb初始质量浓度、pH、吸附时间、吸附温度和菌体浓度等因素对菌株T1吸附矿山酸性废水中Zn2+和pb2+的影响.结果表明:考虑处理效果与经济成本的优化,在Zn2+和pb2+的初始质量浓度分别为100 mg/L和30 mg/L,溶液pH4.0,菌体质量浓度3g/L,吸附时间6h,温度30℃的条件下,菌体T1对Zn2+和pb2+的最大吸附率分别为79.86％和69.04％,此时吸附量分别为26.62 mg/g和6.9 mg/g.在一定的质量浓度范围内(Zn2+为25～125 mg/L,pb2+为10～50 mg/L),菌株T1吸附Zn2+和pb2+的过程符合Langmuir等温吸附方程,该过程以表面吸附为主.     

纳米羟基磷灰石对Zn~(2+)的吸附行为

用人工合成的纳米羟基磷灰石吸附溶液中的金属离子Zn2+,考察吸附时间、pH值及Zn2+初始离子浓度等因素对吸附效果的影响,探讨吸附机理。结果表明:纳米羟基磷灰石对Zn2+的吸附符合拟二级反应动力学方程,吸附时间60 m in即可达到平衡;吸附量与pH值和Zn2+的初始浓度呈正相关关系;纳米羟基磷灰石对Zn2+的吸附属Langmu ir等温吸附类型。     

不同污染条件下微生物矿化固结Zn2+的作用及机理

为了探究微生物矿化处理重金属的作用及机理,选取Zn2+溶液进行模拟研究.采用扫描电子显微镜和X射线衍射仪,研究了不同pH值、温度、离子浓度下微生物矿化产物的成分、显微结构及矿化效果,探究了微生物矿化固结重金属离子的作用和机理.实验结果表明,在不同污染条件下反应生成的矿化产物皆为Zn5(OH)6(CO3)2,条件不同时产物结晶效果有区别.溶液为中性或碱性时,结晶较好;pH值较低时,晶体不易成核生长.温度升高,有利于矿化产物的沉积和成型.Zn2+浓度对微生物矿化固结重金属形成矿化产物的影响较小.当Zn2+,Pb2+,Cu2+等混合离子共同存在时,Zn2+与Cu2+固结在一起形成矿化产物,Pb2+单独结晶.     

酒糟对模拟矿山酸性废水中Pb2+和Zn2+的吸附特征

为了探索生物质材料酒糟对重金属离子的吸附效果,采用静态吸附实验研究废水pH值、Pb2+和Zn2+初始质量浓度以及吸附时间对酒糟吸附模拟矿山酸性废水中Pb2+和Zn2+的影响. pH值为4时酒糟对Pb2+和Zn2+的吸附量分别达到最高值,酒糟对Pb2+的吸附等温线特征符合Langmuir方程,对Zn2+的吸附等温线特征符合Freundlich方程,对Pb2+和Zn2+的最大吸附量分别为8.29 mg·g-1和15.31 mg·g-1.酒糟对Pb2+和Zn2+的吸附反应在4 h后达到平衡,吸附动力学特征均符合拟二级动力学模型.酒糟中纤维素、半纤维素和木质素的质量分数分别为23.3%、65.5%和0.5%,吸附Pb2+和Zn2+后3种物质的含量发生变化,分别为19.6%、42.3%和2.6%.酒糟电负性随pH值升高呈正比增加,吸附Pb2+和Zn2+后电负性减弱.红外光谱分析结果显示酒糟中参与吸附反应的基团主要有酰胺基和酯基.     

γ辐射法制备壳聚糖接枝共聚物及其絮凝性能

以壳聚糖(Cts)和甲基丙烯酸(MAA)为原料,应用γ射线辐射引发技术进行接枝共聚反应,制备了壳聚糖与甲基丙烯酸的接枝共聚产物(Cts-g-MAA),采用搅拌实验和测浊度法研究接枝改性壳聚糖对铅锌选矿废水的絮凝效果,其中考察了废水pH值、Cts-g-MAA的质量浓度、快速搅拌速度、慢速搅拌时间、静置时间对絮凝效果的影响,并将其与壳聚糖的絮凝能力进行了对比.实验结果表明,废水的pH值、絮凝剂质量浓度、搅拌速度、搅拌时间和静置时间均对絮凝效果产生影响,其最佳絮凝条件为pH值8.5、Cts-g-MAA浓度1.2mg/L、搅拌强度300 r/min、慢速搅拌时间为10 min、静置时间为11 min,此条件下的浊度去除率达98.6%.接枝改性壳聚糖的絮凝效果好于壳聚糖,且絮凝时的用量明显低于壳聚糖.     

响应面法优化核桃雄花穗护绿工艺研究

以核桃雄花穗为原料,研究各单因素Zn(CH3COO)2浓度、Vc浓度、pH值、Na2SO3浓度、烫漂温度、烫漂时间对核桃雄花穗护绿效果的影响,在单因素的基础上再通过响应面试验,确定核桃雄花穗护绿的最佳工艺配方.试验结果表明,各单因素影响核桃雄花穗护绿的程度由大到小的顺序依次为Zn(CH3COO)2浓度、Vc浓度、pH值、Na2SO3浓度;通过响就面试验确定了核桃雄花穗护绿的最佳工艺配方为Zn(CH3COO)2浓度254mg/kg、Vc浓度0.048%、Na2SO3浓度0.498%、pH值8.91、烫漂温度为100℃、烫漂时间20s.     

铁碳内电解预处理电镀废水的试验研究

通过改变初始pH值、曝气搅拌时间、混凝pH值和铁碳比等条件,研究了铁碳内电解对电镀废水的处理效果。试验结果表明：当原水初始pH值为3.0,曝气搅拌时间为45min,混凝pH值为8.5,铁碳比为1:1时,电镀废水中色度平均去除率达90%以上,化学需氧量（COD）去除率最高可达41%。     

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     

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