TiO2/竹炭复合体光催化材料的孔隙结构及分布

采用比表面积及孔径分析技术,测定了浸渍法制备的TiO2/竹炭复合体光催化材料的氮吸附等温线,进而运用BET理论计算了其比表面积、总孔容积和平均孔径分别为359.81 m2/g、0317 2 cm3/g和3.526 nm。同时,依据BJH模型分析了其中孔的孔隙结构参数和孔径分布。结果表明：经过纳米TiO2改性的竹炭不仅保留了竹炭固有的孔隙结构,而且其比表面积、孔容积、孔径都有所增加。经纳米TiO2改性制备的光催化材料的中孔孔容积比竹炭提高了65.86 %。     

新型环境净化材料-纳米TiO2的性能及应用

介绍了光催化材料纳米TiO2的光化学特性、光催化活性以及超亲水性、综述纳米TiO2薄膜及纳米TiO2粉末的制备方法、光催化降解性能及其影响因素。提高纳米TiO2光催化降解能力的途径。对纳米TiO2进行改性处理。利用纳米TiO2光催化降解有机污染物及超亲水性制成纳米TiO2薄膜玻璃。同时介绍了纳米TiO2在环境净化方面的应用，如作为一种环保催化剂净化空气，净化被污染水体，光催化杀菌，以及制成纳米TiO2改性涂料应用于建筑行业。     

纳米Pd/TiO2复合型农药的吸附和降解的QCM研究

采用压电石英微天平(QCM)技术研究了有机农药甲基对硫磷在经钯(Palladium)掺杂和软脂酸(PalmicAcid)改性前后的纳米TiO2上的吸附和降解行为.研究表明Pd和PA均能提高纳米TiO2对非极性有机农药的吸附量,复合纳米TiO2和Pd/TiO2的最大吸附量Г∞分别为6.18×10-4mol/g和7.54×10-4mol/g,吸附常数k分别为5.72×103L/mol和1.79×103L/mol.光降解和毒力实验结果表明复合纳米TiO2和Pd/TiO2农药制剂可在太阳光照下自行降解,在农作物体内的残留期大大地缩短,且复合纳米TiO2和Pd/TiO2农药制剂的毒力有明显的提高,5%的纳米TiO2和Pd/TiO2乳液的毒力分别是95%原药毒力的1.68倍和2.19倍.     

纳米TiO2降解源复合型农药制剂

采用压电石英微天平技术研究了有机农药甲基对硫磷在经硬脂酸改性前、后纳米TiO2上的吸附行为.研究结果表明:硬脂酸能提高纳米TiO2对非极性有机农药的吸附量,甲基对硫磷分子在改性后的纳米TiO2上的吸附符合Langmuir吸附,最大吸附量Г∞为1.4×10-3mol/g,吸附常数k为5.5×105L/mol;亲脂性农药可与硬脂酸改性后的纳米TiO2形成稳定的复合体,复合纳米TiO2农药制剂可在太阳光照下自行降解,在农作物体内的残留期大大缩短,且复合纳米TiO2农药制剂的毒力明显提高,质量分数为10％的纳米乳液的毒力是质量分数为95％的原药毒力的1.68倍.     

聚苯胺改性纳米TiO2的制备及其对含氰废水的降解研究

通过矿化接枝技术将溶胶-凝胶法制备的纳米TiO2负载在聚苯乙烯微珠载体上,制成负载型纳米TiO2光催化剂。利用导电聚苯胺对负载型纳米TiO2光催化剂进行可见光改性,通过XRD,SEM等方法对改性纳米TiO2光催化剂进行表征,并用改性催化剂在太阳光照射下对3种工业含氰废水进行降解处理。结果表明：导电聚苯胺对负载型纳米TiO2光催化剂涂膜改性,显著改善了负载型纳米TiO2光催化剂在可见光条件下的光催化性能,可有效降解废水中的大部分有毒氰根（CN^-）,使其含量远低于国家排放标准。     

活性碳负载Fe3+\Zn2+掺杂改性纳米TiO2的制备及光降解性能研究

文章利用溶胶-凝胶法制备出活性碳负载Fe3 \Zn2 掺杂改性纳米TiO2,考察了煅烧温度对催化剂在人造光源下降解甲基橙性能的影响;结果表明在500℃时热处理的样品有较好的降解效果,并且经过活性碳负载的Fe3 \Zn2 掺杂改性纳米TiO2的光催化性能,明显好于未经负载的掺杂改性纳米TiO2粉体。     

TiO2纳米管的离子交换改性及光催化去除水中四环素的研究

以TiO2粉末为前驱体,采用水热法制备得到未改性和Co2+改性的TiO2纳米管,使用SEM、TEM、XRD、XPS、BET和UV-Vis等测试技术对样品进行了表征。以氙灯(250~800 nm)为光源、四环素为降解对象,测试样品在模拟日光下的光催化降解抗生素性能。研究表明:TiO2粉末经水热反应后,转化为中空、开口的TiO2纳米管,纳米管分布均匀且分散性良好;生成的TiO2纳米管为纤铁矿型,Co2+交换改性会对TiO2纳米管的微观形貌和晶型结构产生些许影响。制得的TiO2纳米管,其N2吸附-脱附等温线为典型的IUPAC IV型等温线。与TiO2粉末和未改性TiO2纳米管相比,Co2+交换改性的TiO2纳米管具有较好的光吸收能力,在氙灯光源下反应90 min,其对四环素的降解率可达71.5%。     

掺铜纳米二氧化钛光催化降解偏二甲肼废水

为了对航天废水中的偏二甲肼进行催化氧化降解研究,利用溶胶-凝胶法制备了纯纳米TiO2和掺铜纳米TiO2粉体,并用XRD、IR等手段对其进行表征,测得TiO2和Cu/TiO2粒径分别为29nm和24～25nm。用这几种TiO2对偏二甲基肼废水进行光催化氧化降解实验,实验表明最佳铜离子掺杂量为2.0%,其1h光催化降解率为57.5%,与纯TiO2相比其降解效率提高约1倍。同时研究了温度、TiO2浓度对光催化降解效率的影响规律,结果表明,温度为25℃且TiO2质量浓度为0.6g/L时,降解效率最好。     

乙酰丙酮铁配合物对纳米二氧化钛表面改性

通过吸附法用乙酰丙酮铁配合物对纳米TiO2进行表面改性,以光催化降解甲基橙为探针反应,在紫外光照条件下考察了配合物含量、吸附温度、溶剂用量、吸附时间等改性条件对纳米TiO2催化活性的影响。研究表明,用乙酰丙酮铁改性纳米TiO2非常有效。当w[Fe（acac）3/TiO2]为0．25％,吸附温度为60℃,溶剂用量为乙醇／TiO2等于29mL·g^-1,吸附1．5h时,改性后的纳米TiO2催化活性比改性前有了很大的提高。即使在普通白炽灯光照条件下,改性催化剂仍然显示出很高的光催化活性,明显优于非改性的纯TiO2。改性纳米TiO2经过IR、XRD、UV—Vis、荧光分析表征。     

TiO2纳米膜光催化降解有机污染物的研究

用溶胶-凝胶方法制备TiO2纳米膜，探讨了金属离子铁离子和贵金属Ag、Pt掺杂对TiO2纳米膜光催化降解性能的影响。研究了TiO2纳米膜及掺杂改性的TiO2纳米膜对水杨酸的降解作用，同时还尝试光催化去除过滤后的生物二级处理系统出水中的有机物。实验结果表明TiO2纳米膜有优良的光催化降解性能。     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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