纳米TiO2掺杂Fe3O4光催化剂活性的研究

制备了Fe3 O4掺杂纳米TiO2 光催化剂 ,当Fe3 O4量与TiO2 摩尔比为 0 .5 :10 0时 ,在 30 0℃焙烧 ,催化剂用量为 1.0g·L-1时对甲基橙的水溶液分解效果最佳。SEM、XRD及紫外 -可见光谱分析表明 ,纳米粒子均匀 ,平均粒径 80nm ,有一定团聚 ,掺杂催化剂有一定红移。研究了掺Fe3 O4量 ,焙烧温度 ,溶液的pH值 ,溶液的体积 ,氧化剂的加入等对催化剂降解的影响。紫外光辐射实验表明Fe3 O4的掺入对光催化降解率有一定的提高 ,反复使用不降低催化剂的活性。     

用光催化剂TiO2/WO3处理含Cr6+废水

采用复相光催化剂TiO2／WO3对含重铬酸钾的废水进行处理。探讨了光催化剂的配比、试液的起始浓度、光催化剂的用量、试液的pH值、光照时间与重铬酸钾溶液还原率的关系。实验结果表明：催化剂配比m(TiO2)：m(WO3)=6：1,试液起始浓度为125mg／L,催化剂用量为0．200g,pH=4．4,光照6h,重铬酸钾溶液的还原率可达98．5％。该方法具有操作工艺简单、节省能源、所需设备少、处理彻底、氧化能力强、无二次污染等优点。     

负载型光催化剂对含铬废水的吸附与还原作用研究

研究了竹炭/TiO2光催化剂在紫外光照射下去除Cr(VI)的特性,探索了催化荆用量、Cr(VI)的初始质量浓度、先催化时间、催化剂焙烧温度及溶液酸度对Cr(VI)去除率的影响,确定了竹炭/TiO2光催化剂处理含铬废水的最佳条件.结果表明:反应条件在pH值为0.5,光催化反应时间大于30 min,催化剂的加入量为3 g/800ml时效果最好,建议使用在450℃下进行焙烧2 h的光催化剂,可以采用适当延长反应时间的方法来提高Cr(VI)离子的降解率.     

氮掺杂纳米TiO2的制备及其可见光催化活性的研究

以钛酸四丁酯为原料,尿素为氮源,采用溶胶-凝胶法制备了N掺杂TiO2光催化剂.研究了溶胶液的pH,溶胶液的温度,N掺杂量以及焙烧温度对TiO2光催化剂催化活性的影响,并用XRD、UV-Vis、XPS等手段对催化剂性能进行了表征,考察了催化剂在可见光和紫外光下的催化活性.结果表明最佳的制备条件为:饱和尿素溶液的加入量为4 mL、溶胶液的pH为2.5、溶胶液的反应温度为40℃、焙烧温度为500℃.制得的N/TiO2催化剂为锐钛矿相、平均粒径为18.5 nm.该催化剂在钨灯可见光照射5 h后对亚甲基蓝溶液的去除率为41.8%,比同样条件下用纯TiO2高11.9倍.     

人造沸石负载TiO2光催化降解水中苯酚的研究

采用溶胶-凝胶法制备人造沸石负载型TiO2光催化剂，用XRD分析了其晶型结构，以300W中压汞灯为实验光源对苯酚进行了光降解研究。考察了催化剂热处理温度、TiO2负载量、催化剂用量、降解温度、光强度和H2O2用量等因素对降解率的影响。结果表明，浓度为15mg／L的苯酚溶液，催化剂焙烧温度为5000℃，TiO2负载量为15．7％，用量为2～3g／L，在300℃连续光照3h时，苯酚溶液的降解率可达到87．4％。     

氮掺杂TiO_2光催化剂的制备研究进展

对氮掺杂TiO2光催化剂的制备方法和研究状况进行了系统的综述,并且详细探讨各种制备因素,如pH值、焙烧温度、焙烧时间等对N掺杂TiO2光催化剂的结构和性能的影响以及结构模型和氮掺杂机理,最后指出氮掺杂TiO2催化剂研究中有待解决的问题及今后的发展方向.     

焙烧P-25 TiO2光催化降解高浓度苯酚废水的研究

对P-25 TiO2光催化剂在空气气氛中进行程序升温热处理，用于对高浓度苯酚废水的光催化降解．考察了焙烧温度、催化剂用量、溶液pH和H2O2对光催化降解苯酚的影响，并采用XRD和BET方法对各种温度焙烧的P-25 TiO2进行了表征．结果表明，500℃焙烧的P-25 TiO2光催化降解苯酚效率最高，适宜的晶相结构是500℃焙烧的P-25 TiO2光催化剂表现出较高催化活性的原因．苯酚在催化剂用量为2．0g／L、pH为7．0左右时降解较为适宜．HiO2对苯酚的光催化降解影响显著，在溶液中加入少量H2O3可大幅度提高光催化降解苯酚效率．     

钨掺杂二氧化钛光催化降解结晶紫的研究

溶胶-凝胶法制备了钨掺杂的TiO2纳米粒子,利用XRD对样品进行了表征,并以结晶紫水溶液的脱色为模型反应,研究了钨掺杂TiO2复合光催化材料作为光催化剂降解反应的活性。讨论了光催化剂的配比,光催化剂的用量,光照时间与结晶紫溶液脱色率的关系。实验结果表明:以经过500℃煅烧配比为X(WO3)=3%的WO3/TiO2复合材料为光催化剂,当催化剂用量为500 mg/L,结晶紫溶液的起始浓度20 mg/L时,光照2h,结晶紫的降解率达到96%以上。     

(Cu_(1-x)La_x)_2SnO_4纳米复合光催化剂模拟日光下降解酸性蓝废水

采用共沉淀法合成(Cu1-xLax)2SnO4纳米复合光催化剂,并利用X射线衍射(XRD)和紫外-可见(UV-Vis)漫反射法对其进行表征.以氙灯为光源,酸性蓝62染料溶液为模拟废水,对(Cu1-xLax)2SnO4纳米复合光催化剂的活性进行评价,研究焙烧温度、焙烧时间和La掺杂量对其催化活性的影响,讨论光催化剂用量和酸性蓝62初始浓度与降解率的关系.研究结果表明,450℃温度下焙烧2.5h制得的(Cu1-xLax)2SnO4(x=0.06)纳米复合光催化剂具有最高的光催化活性,在模拟日光(氙灯)光照下反应2h后对酸性蓝62溶液的降解率达到97.71%,明显高于在同等条件下DegussaP25TiO2的催化活性.     

掺铁二氧化钛光催化剂的制备及催化性能

以钛酸四丁酯和Fe（NO3）3.9H2O为原料,在室温下制备得到TiO2和掺铁TiO2光催化剂粉体;以紫外灯为光源,甲基橙溶液为目标降解物,在紫外-可见分光光度计上对其光催化活性进行了研究。实验结果表明：掺杂Fe3＋的TiO2光催化剂比纯TiO2具有更好的催化活性,在Fe3＋掺入量为0.05%,催化剂加入量为2g,紫外光照时间为3h时,掺铁TiO2光催化剂可达到83%的光催化降解效率。     

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