水中盐酸四环素的超声辐照降解

为了了解超声波对水溶液中盐酸四环素(TC.HCl)的降解作用,探讨了超声频率、超声功率、溶液初始质量浓度、pH值以及阴离子对降解效果的影响.结果表明:超声可快速有效地降解水中的TC.HCl,超声对TC.HCl的降解符合拟一级动力学模型.当pH值为5.60左右、超声频率为400kHz、超声功率为100W时,超声辐照20min后,1.00mg/LTC.HCl的去除率可达到88.17%;在试验所研究的范围内,TC.HCl的降解速率随超声功率的增大而提高,随初始质量浓度的增大而降低;溶液pH值对降解效果影响显著,碱性条件更利于TC.HCl的降解;Cl-和SO42-对TC.HCl的降解稍有抑制,NO3-离子对TC.HCl降解略有促进,而HCO3-、HPO42-的促进作用显著.     

超声波降解吲哚废水的实验研究

研究了吲哚模拟废水在超声波作用下的降解, 并对超声波与电化学协同作用下吲哚的降解规律进行了初步探讨. 考察了废水初始浓度、pH值、处理时间、超声功率、外加催化剂以及声电协同作用下电流密度等因素对吲哚降解的影响. 结果表明, 超声处理吲哚的降解规律符合一级反应; 处理时间越长, 降解率越大; 吲哚初始浓度较低时, 降解率较大; 随着 pH值的增大, 降解率先增大后减小, 在 pH=8左右降解率最大; 降解率随超声功率的增大而增大, 在120 W时达最大值, 随后降低; 加入1 .5 mmol/L H2O2, 对吲哚的降解有较大的促进作用. 在超声波存在下, 电解电流在1 0~2. 2 A范围内, 降解率随电流先增大后减少, 电流为1. 9 A时, 降解率达最大值; 声电化协同作用能提高吲哚的降解率.     

超声-Fenton氧化法处理啤酒废水的实验研究

论文采用超声与Fenton高级氧化技术联合处理啤酒废水,同时考察了影响啤酒废水COD去除率的影响因素.当功率为200 W,超声波频率为45 kHz,初始pH值为2,超声时间为20 min,H2O2浓度为70 mmol/L,FeSO4浓度为7 mmol/L时,啤酒废水COD去除率达到89.8%.     

UV-TiO_2/硅藻土光催化降解DMF的影响因素分析

为探讨废水中DMF光催化氧化的降解规律,采用溶胶-凝胶法水解钛酸四丁酯制备硅藻土负载TiO2复合光催化剂.以DMF溶液的光催化降解为模型反应,研究了初始质量浓度、催化剂质量浓度、pH值、光强、外加双氧水等因素对DMF去除效果的影响.结果表明:随初始质量浓度增加,光强增大,H2O2用量增加,去除率提高;去除DMF的最佳催化剂质量浓度为2~4g/L,pH为5.36;在初始质量浓度为200mg/L、紫外灯功率为300W时,最大去除率达89.3%.设计正交实验确定了各因素对光催化降解DMF反应影响的重要性为:光照时间>初始质量浓度>光照强度>H2O2浓度>催化剂质量浓度.     

超声波对印染废水中COD的去除试验研究

对超声波对印染废水中COD的去除效果进行了实验研究,考察了废水初始COD值、反应时间、温度、超声功率和pH值等因素的影响。结果表明,超声波对印染废水中COD有非常明显的去除效果,超声辐照120min,印染废水、1∶5和1∶2(漂炼∶印染废水)混合废水的COD去除率分别达到62.28%、77.27%和90.74%;废水的COD超声去除率随温度的升高而降低,随超声波功率的升高而增加;在pH=8.0(±0.3)时超声波降解印染废水效果达到最佳。实验还考察了几种无机盐对反应的影响,结果表明,加入KNO3、NaCl、CaCl2和FeCl3均提高了COD的去除率,特别是FeCl3,反应90min,废水的COD去除率达到99.46%,没有加无机盐时为83.33%。除盐析作用外,可能是由于FeCl3加快了HO.自由基的生成,促进了超声波对印染废水的自由基氧化作用。     

水中盐酸四环素的超声辐照降解研究

摘要：为了研究超声波对水溶液中盐酸四环素(TC•HCl)的降解作用,探讨了超声频率、功率、溶液初始浓度、pH值以及阴离子对其降解效果的影响。结果表明：超声技术可快速有效地降解水中TC•HCl。当pH为5.5左右、频率400 kHz、功率100W时,超声辐照20min后,1mg/L TC•HCl的去除率可达到88.17%。超声对TC•HCl的降解符合拟一级动力学模型。在试验所研究的范围内,TC•HCl的降解速率随超声功率的增大而提高,随初始浓度的增大而降低,并且存在一个最优的降解频率400 kHz。溶液pH值对降解效果影响很大,碱性条件更利于TC•HCl的降解。Cl-和SO42- 对TC•HCl降解略有抑制。NO3-离子对TC•HCl降解略有促进,而HCO3-、HPO42-促进作用显著。     

超声波-Fenton氧化法处理米诺环素制药废水研究

米诺环素制药废水难以被常规的生物法氧化降解,用超声波-Fenton组合高级氧化法对其进行处理,进行了单因素和正交实验.以COD值变化为测定指标,在超声波28 k Hz频率、15 min反应时间下,研究了H_2O_2的投加量、超声波功率、Fe~(2+)/H_2O_2物质的量的比和反应初始值pH对处理米诺环素废水效果的影响.结果表明,当H_2O_2的投加量为8 m L/L,超声波功率为300 W,Fe~(2+)∶H_2O_2物质的量的比为1∶20,反应初始pH值为3.0的条件下,COD的去除率达到最大,为86.15%.说明超声波-Fenton氧化法对于这种四环素类难降解抗生素制药废水的降解效果很好.     

微波辅助类Fenton体系处理印染废水的试验

目的研究微波辅助类Fenton体系降解活性艳红X-3B染料废水的处理效果及p H值、催化剂投加量、H_2O_2投加量、微波辐照时间、功率等因素对废水色度和COD去除率的影响.方法制备催化剂,在微波辅助的条件下,控制pH值、H_2O_2投加量、微波功率及辐照时间、催化剂投加量,比对活性艳红X-3B的处理效果.结果初始色度为1 897倍的活性艳红X-3B废水,在催化剂投加质量浓度为10 g/L、初始pH值为3、H_2O_2投加浓度为17.5 mmol/L、微波功率为400 W,辐照时间为8 min的最优条件下,色度去除率最高可以达到99.08%,COD最大去除率达到89.12%.结论微波辅助类Fenton体系能有效处理活性艳红X-3B废水,提高废水的色度去除率和COD去除率,且该类Fenton体系投药量低,适用的pH范围也更广.     

光催化-臭氧联用技术降解苯胺研究

研究了光催化-臭氧联用技术对苯胺废水的降解.结果表明,光催化-臭氧联用对苯胺的降解具有一定的协同效应,COD去除率大大高于单一光催化和单一臭氧的COD去除率,在较高苯胺初始浓度时效果更为显著,这是因为臭氧和光催化剂协同产生了更多的.OH.苯胺废水的初始pH和初始浓度对苯胺光催化-臭氧联用的降解效果影响不大,且COD去除率均能达到90%以上.另外,臭氧流量的增大能提高苯胺的降解效率并缩短降解时间.论证了在苯胺降解过程中有中间产物生成.     

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...     

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