流态化TiO2/AC光催化降解水中苯酚的研究

以粒状(颗粒尺寸为4～8 mm)活性炭为载体,采用溶胶-凝胶法制备了负载型TiO2/AC光催化剂,并采用XRD、SEM对催化剂的晶型结构和形貌进行了表征.选择苯酚为降解对象,考察了溶液的初始pH值对苯酚溶液光催化降解的影响及催化荆的稳定性.结果表明:所制备光催化剂中的TiO2为锐态矿型和金红石型的混晶型结构,且为分布均匀的纳米白色簇状颗粒;在苯酚质量浓度ρ0=100 mg/L,苯酚液体积V=100 mL,催化剂投加量mc-0.5 g,紫外光光强I=4.9mW/cm2,pH=4,λ=365 nm的实验条件下,经过2.5 h的光催化降解反应,苯酚的去除率接近90%,矿化率达到68%.     

以陶瓷-活性炭为载体的光催化剂降解苯酚研究

采用浸渍法将TiO2溶胶涂覆于陶瓷-活性炭载体,得到陶瓷-活性炭负载TiO2光催化剂.以苯酚废水为模拟目标降解物,采用紫外杀菌灯为实验光源,对光催化剂进行了光降解性能的研究.考察了TiO2负载次数、溶液pH值、苯酚初始浓度以及陶瓷-活性炭载体特性等因素对陶瓷-活性炭为载体的TiO2光催化剂降解苯酚的影响.结果表明,负载两次得到的复合光催化剂表现出良好的活性与稳定性.对初始浓度为50mg/L,初始pH值为6.5的苯酚废水的降解效率最好,处理6h后降解率达到97.31％.     

超声协同纳米ZnO光催化降解亚甲基蓝研究

制备了光催化剂纳米ZnO,并对催化剂进行表征,探讨了超声协同纳米ZnO光催化氧化降解亚甲基蓝的影响因素.结果表明:与单一超声法(US)、单一光催化氧化法(UV+ZnO+O2)相比,超声协同光催化氧化法(US+UV+ZnO+O2)对亚甲基蓝的降解效果显著;在超声功率为200 W、催化剂用量为2.0g/L、亚甲基蓝溶液的初始浓度为10mg/L、光照时间100min时,亚甲基蓝溶液的降解率可达92%以上.     

苯酚废水的光氧化降解研究

研究了UV/Fenton、日光/Fenton、UV/TiO_2和UV/Fe~(2+)等几种光氧化体系对模拟苯酚废水的氧化降解。结果表明,在上述几种光氧化体系中,UV/Fenton体系对苯酚的氧化降解能力最强,可很快地使苯酚矿化,日光/Fenton体系的降解能力次之;而UV/TiO_2与UV/Fe~(2+)体系对苯酚的降解效果较差。反应初始pH值与催化剂Fe~(2+)用量等因素对苯酚的降解均有很大影响,光Fenton反应体系中,pH值在3～4范围内,苯酚的矿化效果较佳,pH值超过此范围,矿化率则急剧下降;苯酚的矿化率随着Fe~(2+)用量的增加而逐渐增大,但当Fe~(2+)达到一定量时,再增加Fe~(2+)用量,苯酚的矿化率反而有所下降。     

ZnO/Fe2O3光催化降解苯酚

用浸制法制备,ZnO/Fe2O3为光催化剂,日光灯为灯源,以苯酚降解为探针反应,考察了不同ZnO负载量对ZnO/Fe2O3为光催化剂的活性的影响,并考察不同光源,催化剂用量,苯酚的初始浓度,溶液的PH值和降解温度对苯酚光催化降解过程的影响.结果表明,ZnO负载量的最佳量为3%,最佳的工艺条件是苯酚浓度是20mg/L,催化剂用量为0.05g,PH值为13时在常温下用日光灯光照射,能较好地降解苯酚.     

超声波-光催化降解处理苯酚的实验研究

为了证明超声波-光催化氧化法处理水中的化学污染物的效果,通过光催化氧化法和超声波氧化法联合处理苯酚,对三种降解体系的降解效果做了比较,分析 pH、催化剂、时间等影响超声-光催化降解效率的因素,寻求超声波-光催化降解苯酚的适宜条件,研究结果表明:超声-光催化联合法比单一的超声波氧化法、光催化法降解率要高.在pH为6.0~7.0,催化剂的投加量为0.4 g,时间为2 h的条件下苯酚的降解效果最好.     

Ce/S共掺杂TiO2制备及其光催化活性

采用溶胶-凝胶法制备了沸石负载型Ce/S共掺杂TiO2光催化剂,探讨了可见光下负载型共掺杂TiO2光催化剂的光催化降解亚甲基蓝的可行性和工艺条件.研究结果表明,催化剂焙烧温度300℃,反应体系pH值为7.02时的亚甲基蓝降解效果最好.共掺杂复合光催化剂活性要好于单掺杂和不掺杂的光催化剂活性,负载型复合光催化剂具有很好的重复使用性能.     

微波辐射法制备TiO2/丝光沸石薄膜光催化剂的研究

采用微波辐射加热法制备出负载型TiO2/丝光沸石(TiO2/M)光催化剂,并采用X-射线衍射(XRD)、激光拉曼光谱(LRS)、UV Vis漫反射谱(UV DRS)以及苯酚光催化降解等对催化剂进行评价。结果表明,由微波加热制备的样品———丝光沸石上负载的二氧化钛薄膜其晶体具有锐钛矿型结构,并显示出明显的量子效应。以丝光沸石作为二氧化钛薄膜的载体,可以显著提高水体中苯酚的完全矿化率。负载量为30%,微波辐射时间为10min+10min的样品催化剂对苯酚光催化降解具有最佳的催化性能。     

气质联用测定超声波降解废水中的苯酚含量及机理研究

采用GC-MS分析了水中苯酚在通氧条件和未通氧条件下的超声波降解过程.通过分解产物考查了苯酚在水中的超声波降解机理.分析结果表明,复合氧化工艺过程US/O2中比在单独超声波辐射(US)氧化下的苯酚去除率有所提高,说明协同效应存在.在相同的降解时间下,有氧降解比无氧降解苯酚去的除率高出2%～4%,并在降解中间产物检测到了乙酸乙酯.     

光催化流化颗粒的制备及光催化性能的研究

采用浸渍法以活性炭为载体制备了TiO2／C光催化剂，通过XRD，SEM技术对负载型光催化剂的晶型结构和形貌进行了表征，以苯酚溶液为降解对象，考察了溶液的初始浓度、不同pH、催化剂负载量以及气体流量对负载型二氧化钛光催化降解苯酚溶液过程的影响。结果表明：颗粒上TiO2的晶型为锐钛型和金红石型的混合晶型，纳米TiO2分布均匀。在苯酚初始质量浓度为ρ0=50mg／L，pH=3，ρ（TiO2）=0．98mg／mL和v=382．2mL／min的实验条件下，经3．0h的光催化降解反应，苯酚溶液降解率接近95．8％，矿化率达到65．4％。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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     

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