纳米掺锡二氧化钛的制备及其光催化降解碱性藏花红

以无机物TiCl4、SnCl4为原料,共沉淀法制备了掺锡和不掺锡的TiO2纳米粒子,用XRD进行表征,并通过碱性藏花红光催化降解实验评价样品的光催化活性。重点考察了焙烧温度和掺锡量对TiO2光催化活性的影响。结果表明,在450℃焙烧适量掺锡的二氧化钛催化效果明显,甚至在普通光源下也有较高的催化活性。     

纳米二氧化钛在环保领域中的应用

本文综述了纳米二氧化钛光催化氧化降解机理及其光催化活性和纳米二氧化钛在环境领域各方面的应用。纳米二氧化钛光催化降解法特别适用于处理那些用生物或一般化学方法难以降解的芳烃和芳香化合物，如降解废水中有机污染物及重金属污染物及治理室内外各种空气污染物和城市垃圾等。讨论了纳米二氧化钛应用在环保领域降解环境污染物的优点，指出目前存在的问题和研究焦点，并对其在该领域的前景作以展望。     

纳米二氧化钛光催化剂的综合性实验设计

光催化及纳米二氧化钛光催化剂研究为当今重要的研究课题之一,为了让化学类本科生了解和掌握光催化原理和催化剂的制备,在大量研究工作的基础上,我们设计了关于纳米二氧化钛光催化剂的制备及其性能研究的实验,包括溶胶-凝胶法制备纳米锐钛矿型二氧化钛光催化剂,甲基橙的光催化降解过程等实验内容。     

纳米二氧化钛应用研究进展

介绍了纳米二氧化钛的制备方法以及光催化反应机理，讨论了光催化反应在废水处理中的应用，并对研究的主要方向进行了展望。     

东华大学博士生导师张青红教授莅临我校讲学

2014年4月16日上午,东华大学材料学院无机非金属材料系主任、博士生导师张青红教授应邀在我校化学实验楼学术报告厅作了题为＂纳米二氧化钛基光催化材料的研究进展＂的学术报告.报告会上,张青红教授介绍了纳米二氧化钛在光催化降解有机污染物、光解水制氢及二氧化碳光还原等方面的应用,并针对其应用瓶颈,结合他的研究实践,介绍了纳米二氧化钛等材料结构与性能调控方面的研究经验及成果,特别是对近年来发展的蒸汽相水解制备核壳结构、易回收光催化剂、     

CuO/TiO2的制备及其光催化性能研究

以钛酸丁酯和无水乙醇为反应物,采用溶胶-凝胶法制备CuO负载TiO2.以亚甲基蓝为模型反应物,实验结果表明,Cu/Ti元素质量比为30%,焙烧温度为500℃,产品光催化降解亚甲基蓝的反应性能最好.日光灯照射10 h后,亚甲基蓝的降解率可达58.4%.XRD表征结果显示,二氧化钛晶相为锐钛矿和金红石混晶结构,在Cu/TiO2中Cu以CuO晶体形式存在.     

铕掺杂的TiO2纳米粒子的制备及光催化活性的研究

本研究利用溶胶-凝胶法,以硅胶为载体,制备了掺铕TiO2纳米光催化材料.重点研究了钆钛比、焙烧温度及镀膜次数不同时对产物的光催化活性的影响.并以太阳光作为光源,对甲基橙进行了光催化降解试验来评价制备的复合光催化材料的光催化性能.实验表明,其最佳铕钛比为1.0%,焙烧温度为550℃,镀膜次数为2次.     

改性TiO_2催化剂降解二号橙活性影响因素探讨

以尿素作氮源,氟化铵为氟源,采用溶剂热法制作了N和F共掺杂的纳米TiO2催化剂,考察了环境温度、湿度、氟钛比和焙烧温度对降解污染物二号橙的光催化活性。结果表明,环境条件对可见光下催化剂F-N-TiO2降解二号橙有较大影响,最佳环境条件为:温度35℃、湿度45%;当氟钛比为0.1,焙烧温度为400℃时活性较佳。多元非金属元素共掺杂的N-F-TiO2催化剂有更好的可见光催化活性。     

前景光明的纳米光催化剂

研究背景１９７２年Ｆｕｊｉｓｈｉｍａ关于Ｈ２Ｏ水在ＴｉＯ２二氧化钛电极上光催化分解为Ｈ２氢和Ｏ２氧的发现，标志着多相光催化时代的开始。７０年代随着世界范围内能源危机的爆发，以太阳能转化和利用光催化制氢为目的的研究课题，因其在开发新能源、改变能源结构及保护生态环境方面所具有的深远意义而成为光催化应用研究领域的热点。该方面的研究在８０年代达到了高峰。但由于普通ＴｉＯ２的光催化活性较低，因此该方面的研究一直没有突破性的进展。９０年代后，由于全球性的环境污染问题日益严重以及纳米制备技术的高速发展，以纳米…     

二氧化钛的制备和改性研究

通过溶胶-凝胶法制备Ti O2粉末,对Ti O2粉末进行了XRD、DRS表征,探讨了二氧化钛的煅烧温度和稀土掺杂对其光催化性能的影响.结果表明,随煅烧温度升高,Ti O2逐渐由无定型向锐钛矿转化,当温度高到700℃开始出现金红石型,制备锐钛矿Ti O2的最佳煅烧温度为500℃.稀土离子掺杂扩展了Ti O2的光响应范围,同时提高了晶体的热稳定性,从而抑制Ti O2晶粒生长,有利于提高二氧化钛光催化活性.     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Social and Cultural Influence on Word Meaning

Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language.     

汉字倒说

汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.