TiO_2插层氧化石墨烯PAN纳米纤维降解活性大红性能研究

以氧化石墨烯为载体,通过原位生成的方式制备TiO_2插层氧化石墨烯,并以PAN为成纤载体、DMF为溶剂,采用静电纺丝法制备TiO_2插层氧化石墨烯PAN纳米纤维;通过透射电镜(TEM)、紫外可见光光谱(UV)、X-射线衍射(XRD)、热重分析(TG)等手法对TiO_2插层氧化石墨烯及TiO_2插层氧化石墨烯PAN纳米纤维的形貌、结构进行表征分析;研究了含不同TiO_2插层氧化石墨烯PAN纳米纤维光催化降解活性大红的性能.结果表明:TiO_2插层氧化石墨烯PAN纳米纤维对活性大红有优异的光催化降解性能,且随着TiO_2插层氧化石墨烯含量的增加,完全降解活性大红所需的时间逐渐变短.     

Nd掺杂与人造沸石载体对TiO_2光催化活性的影响

以具有规则多孔结构的人造沸石为载体,以Nd(NO3)3和Ti(OBu)4为前驱体制备钕离子掺杂TiO2光催化剂.在紫外光的照射下,以甲基橙为光催化降解反应模型化合物,研究了TiO2、Nd-TiO2、TiO2/沸石、Nd-TiO2/沸石光催化剂的活性.通过FT-IR的表征,探讨了Nd和沸石对TiO2的光催化活性的影响.实验结果表明:掺杂钕离子能提高TiO2的光催化活性,催化剂用量为2 g/L,掺杂量为1.0%时,光催化活性最高;用人造沸石为载体所制得的TiO2光催化剂对甲基橙也具有较好的光催化降解效果.     

Ag/TiO_2/AC光催化氧化NO性能研究

以活性炭(AC)为载体,采用溶胶-凝胶法和浸渍法制备新型光催化剂Ag/TiO_2/AC,利用SEM、XRD、BET和UV-Vis光谱等手段对样品进行了表征,并以模拟烟气中的NO为对象,进行光催化氧化性能测试。结果表明,Ag/TiO_2/AC的比表面积为895.21 m~2/g,且对光响应波长已扩展到可见光区,该催化剂在光催化氧化NO反应中具有优异的活性,NO的氧化率高于60.5%。     

TiO2/γ-Fe2O3磁分离光催化剂的制备及其催化性能研究

自 1 976年 Carey等发现 Ti O2 - H2 O体系在光照条件下可非选择的氧化降解有机物以来 ,半导体多相光催化技术已成为一个新兴的研究学科 .由于Ti O2 具有化学稳定性好、光催化活性高、价廉易得等优点 ,已被广泛应用于处理各种有机废水 [1] .在难降解有毒有机物的矿化分解等方面比电催化、湿式催化氧化技术具有明显的优点[2 ] .但光催化技术在水处理与废水处理上尚未工业化 ,在工程应用上存在的主要问题是悬浮体系光催化粉末需要分离回收 ,而且相当一部分催化剂流失 ,回收的催化剂活性也有所降低 [3 ] .将光催化剂固定在玻璃等材料上可以…     

可见光催化剂Ag_3VO_4的制备、表征及其光催化性能的研究

通过化学沉淀的方法来制备光催化剂Ag3VO4,用紫外-可见光谱、X射线衍射和荧光光谱对其进行表征.通过光催化还原Cr6+和光催化氧化甲基橙的效率来评价该催化剂的活性.实验研究了不同的制备条件对Ag3VO4催化活性的影响.实验结果表明,在可见光下,在过量银条件下制备的Ag3VO4有较好的光催化氧化活性和光催化还原活性,且其紫外-可见吸收光谱有较大程度的红移,提高了对光的利用率.实验同时还研究了在过量银条件下制备出的Ag3VO4的稳定性和循环次数.同时对影响Ag3VO4的光催化活性的机理还进行了探讨.     

TiO_2有机膨润土复合光催化材料处理TNT废水的实验研究

该文以钠基膨润土(NM)为原料,以十六烷基三甲基溴化铵为改性剂,制备有机膨润土(YM)。并以其为载体,采用溶胶凝胶法制备铁掺杂TiO_2/膨润土复合光催化材料,以TNT为目标降解物,考察复合材料的光催化活性。自制复合材料在可见光下无活性,在紫外光下具有较好的光催化性能。经TNT光催化实验证明,当加入浓硝酸1.5mL(pH=1.5),TiO_2与有机膨润土质量比为1∶0.8,掺铁量在2.0%～3.0%之间时,得到的复合材料在紫外光照射下对TNT溶液具有最好的光催化活性,反应平衡时去除率可达到75%以上。     

熔融-分相法制备纳米TiO2的光催化性能

利用熔融-分相法制备了以多孔玻璃为载体的纳米TiO2光催化材料,以甲基橙为被降解物,研究了不同条件下的光催化活性,并与用溶胶一凝胶法制备的纳米TiO2的光催化活性进行了对比.实验结果表明:不同的光源、光照时间和催化剂颗粒粒度对光催化活性都有较大的影响;与用溶胶一凝胶法制备的纳米TiO2有类似的光催化活性.     

三氯乙烯气相光催化氧化研究

本文以纳米颗粒TiO2为活性组分，制备了不同的负载化催化剂，并对三氯乙烯（TCE)气相光催化氧化过程进行了研究。实验结果表明在近紫外光的照射下，气相污染物可被迅速降解。载体不仅起到固定添组分的作用，而且其吸附作用有助于更好地发挥活性组分的摧化活性。     

非均相光催化氧化法处理含酚废水

以 Ti O2 微粉及各种载体负载 Ti O2 为催化剂对含硝基苯酚废水进行光催化氧化实验。结果表明 ,活性炭负载 Ti O2溶胶型催化剂具有较高的光催化活性 ;当采用 30 0 W高压汞灯、催化剂质量分数为 0 .3%、p H值 =3.8、光催化降解 180 min时 ,对硝基苯酚水溶液的 COD去除率达 93%、工业含酚废水的 COD去除率为 80 %～ 83%。     

熔融-分相法制备纳米TiO2的光催化性能

利用熔融-分相法制备了以多孔玻璃为载体的纳米TiO2光催化材料,以甲基橙为被降解物,研究了不同条件下的光催化活性,并与用溶胶一凝胶法制备的纳米TiO2的光催化活性进行了对比.实验结果表明：不同的光源、光照时间和催化剂颗粒粒度对光催化活性都有较大的影响;与用溶胶一凝胶法制备的纳米TiO2有类似的光催化活性.     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has