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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。 相似文献
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纳米二氧化钛光催化剂的综合性实验设计 总被引：1，自引：0，他引：1
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。 相似文献
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纳米二氧化钛光催化降解空气中甲醛影响因素的研究 总被引：8，自引：0，他引：8
研究了在自制反应舱中纳米TiO2对室内空气中甲醛的光催化降解反应的影响因素，比较了载体对TiO2光催化降解甲醛速率的影响，发现泡沫镍网镍网最适合作为栽体。分析了掺杂的影响，发现活性炭和纳米掺锑氧化锡(ATO)粉末的加入能明显提高甲醛光催化降解速率。研究了粘结剂对TiO2光催化作用的影响，水玻璃的加入能够提高降解速率。 相似文献
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纳米二氧化钛表面改性 总被引：3，自引：0，他引：3
对纳米二氧化钛进行表面改性处理是钛白粉工业生产中必不可少的关键步骤,处理的方法和包覆的程度直接影响产品的应用范围.阐述了纳米二氧化钛的表面改性原理和化学表面改性的两种方法──无机包膜改性和有机包膜改性.无机包膜改性包括铝包膜改性、硅包膜改性、铁包膜改性和硅铝复合包膜改性;有机包膜改性主要是醇类化合物和羧酸类化合物对纳米二氧化钛的包覆改性. 相似文献
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纳米二氧化钛表而改性 总被引：1，自引：0，他引：1
对纳米二氧化钛进行表面改性处理是钛白粉工业生产中必不可少的关键步骤,处理的方法和包覆的程度直接影响产品的应用范围。阐述了纳米二氧化钛的表面改性原理和化学表面改性的两种方法——无机包膜改性和有机包膜改性。无机包膜改性包括铝包膜改性、硅包膜改性、铁包膜改性和硅铝复合包膜改性;有机包膜改性主要是醇类化合物和羧酸类化合物对纳米二氧化钛的包覆改性。 相似文献
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《莆田学院学报》2019,(2):89-93
以泡沫镍网为载体,镀二氧化钛制成的光催化薄膜,并用于降解饮用水中消毒副产物(DBPs)的模拟污染物三氯乙烯。合成的二氧化钛催化剂比表面积、晶相结构及分子结构特征分别用N_2低温吸附-脱附等温线测试、X射线粉末衍射仪(XRD)及红外光谱表征。考查了光照强度、流量、催化剂等对降解效果的影响。结果表明,以泡沫镍网为载体的光催化薄膜对水中的三氯乙烯为代表的DBPs具有较高的去除率,在流量为60 L/h时,在运行时间节点为50 min时,泡沫镍网负载-二氧化钛光催化系统对三氯乙烯的去除率达到60%以上。光照强度、流量、催化剂均对实验效果具有一定的影响。 相似文献
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综述了近10年来纳米二氧化钛粉体的液相制备方法，以及作为一种光催化剂在环境保护中的应用．提出了纳米二氧化钛今后的研究方向。 相似文献
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《商丘师范学院学报》2014,(6):34-34
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、 相似文献
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洛克沙胂,Roxarsone.其化学名为3-硝基-4-羟基-苯肿酸,是一种近年来在世界各国广泛使用的含砷饲料添加药物.目前已经有实验证明了洛克砂胂在自然环境中可以从有机肿转化成无机砷,自身毒性因此增强.因此不能忽视残留在环境中的洛克沙胂的安全隐患.通过吸附反应可以将环境中的洛克沙胂去除,处理起来方便简单.纳米二氧化钛由于具有巨大的比表面积和特别发达的微孔,吸附性能和化学稳定性良好,可以耐强酸、强碱,能经受水浸、高温、高压作用.本文将纳米二氧化钛作为吸附洛克沙胂的吸附剂,研究了不同条件下纳米二氧化钛吸附洛克沙胂的去除效果.实验表明,纳米二氧化钛质量在0.05g~0.25g范围内质量越高,纳米二氧化钛吸附洛克沙胂效果越好.酸碱度会很大影响体系的吸附过程,p H越小,效果越好.加入NaH_2PO_4·2H_2O的浓度越高,纳米二氧化钛吸附洛克沙胂的效果越差. 相似文献
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《海外英语》2007,(5):10-11
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? 相似文献
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《海外英语》2007,(4):36
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. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献