共查询到20条相似文献，搜索用时 93 毫秒
1.
以废纸为原料,经磷酸活化后与纳米TiO2混合,再经微波加热炭化制备出负载纳米TiO2的活性炭光催化剂,实验测定了该催化剂对麦草畏的吸附性能,其吸附等温线可用Freundlich和Langmuir等温线模型进行回归分析,饱和吸附量为101.2mg/g.该催化剂在紫外光下可降解除草剂麦草畏,和未负载活性炭的纳米TiO2催化剂相比,所制备的催化剂光催化活性更高,有较好的沉降分离性和过滤分离性,有利于光催化剂从溶液中分离和重复使用. 相似文献
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以纳米TiO2富集分离-冷原子吸收法测定水环境中的Hg（Ⅱ）、苯基汞,考察了两种形态汞在纳米TiO2上的富集、分离行为。试验结果表明：pH值对纳米TiO2吸附Hg（Ⅱ）、苯基汞影响显著,最佳pH值分别为9.0、10;纳米TiO2对Hg（Ⅱ）、苯基汞的吸附速度快,最佳吸附时间均为12min;φ（HCl）=15%时,对Hg（Ⅱ）和苯基汞的洗脱率达90%以上。 相似文献
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研究了纳米TiO2对铊的固相萃取性能,考察了吸附的最佳pH值和吸附容量。实验表明,在最佳pH条件下,铊定量、快速地被吸附在纳米TiO2上,275,293,313 K时最大吸附容量分别为3.44 mg g-1,4.10 mg g-1,4.88 mg g-1,等温吸附线呈现可逆的Langmuir吸附形式。标准吸附自由能变ΔGθ为负值,表明该过程属自发的吸热反应。被吸附在纳米TiO2上的Tl(Ⅲ)能采用100℃水浴恒温10分钟定量洗脱,回收率达到98.24%。铊的检出限为0.49μg L-1,相对标准偏差(RSD%)为6.2%,该方法可应用于实际水样和多金属结核样品GBW07296中铊的测定。 相似文献
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随着对半导体纳米TiO2研究的深入,其光催化特性及应用备受关注.在环保中,纳米TiO2常用于污染物的分解,是一种高效无二次污染的光催化剂.文章简要评述了纳米TiO2的基本性质和主要制备方法,探讨了其光催化机理以及在治污中的应用,对纳米TiO2光催化中存在的问题,提出了初步的解决方法. 相似文献
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综述了纳米TiO2光催化自洁原理、纳米TiO2制备方法及改性方法,同时也介绍纳米TiO2光催化自洁技术的研究现状和发展趋势。 相似文献
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TiO2/AC的制备及光催化降解四氯乙烯性能 总被引：1，自引：0，他引：1
以钛酸四丁酯为前驱物,活性炭(AC)为载体,蔗糖为胶粘剂,采用真空吸附水解的方法制备纳米光催化活性炭,再经氮气环境下100～400℃不同温度的焙烧处理,制得TiO2/AC催化剂。采用BET和XRD等手段对其物理化学特性进行表征。以水中四氯乙烯为探针分子考察TiO2/AC催化剂的光催化降解性能。结果表明,在光照2 h条件下,TiO2/AC催化剂可以将水中溶解的四氯乙烯量降解90%以上。催化剂可以多次循环使用,光催化反应活性不变。 相似文献
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综述了纳米TiO2光催化自洁原理、纳米TiO2制备方法及改性方法,同时也介绍纳米TiO2光催化自洁技术的研究现状和发展趋势. 相似文献
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竹炭负载二氧化钛吸附甲醛的研究 总被引：1，自引：0，他引：1
采用溶胶-凝胶法制备TiO2溶胶,采用浸渍-过滤法将TiO2负载于载体颗粒竹炭(BC)的表面,制成竹炭负载二氧化钛的复合物TiO2/BC,并对甲醛进行吸附实验。结果表明:BC和TiO2/BC对甲醛都具有较强的吸附,但是达到饱和吸附时,TiO2/BC的吸附量较大,单位时间内TiO2/BC的吸附甲醛的质量比BC多,且经过多次负载的TiO2/BC其对甲醛的吸附量增加,以负载3次为佳。 相似文献
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分析染料废水的特点及其处理现状,重点对目前国内外TiO2及其复合物、Fe3O4及其复合物、碳纳米材料、其他纳米吸附材料在染料废水处理中的应用进行了详尽的归纳,对比与总结.纳米材料是高效廉价的现代高新材料的先驱,若能对纳米吸附材料多加研究,将为染料废水处理技术开辟一条崭新的途径.提高染料废水处理技术,不仅有利于环境保护,而且还可以促进工农业的发展以及人类社会的进步. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
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。 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 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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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 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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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献
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The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies. 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