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1.
通过对活性炭纤维(ACF)进行热处理和氧化改性得到具有不同比表面积、孔结构以及含氧官能团的ACF样品,并对这一系列样品进行甲醛吸附研究。实验结果表明,沥青基活性炭纤维(P-ACF) OG-5A具有最小的比表面积和孔容,具有最大的甲醛穿透容量。通过回归分析表明,ACF样品的甲醛穿透容量主要由孔径为0.9~1.8 nm的孔的比表面积和孔容来决定,而不是取决于总比表面积和总孔容。P-ACF OG-7A的氧化改性显著提高了样品的甲醛吸附能力,其中浓HNO_3改性后提升效果最为明显,改性后穿透容量为58.21 mg/g,是未改性样品穿透容量的2.5倍。氧化改性ACF表面含氧量的增加使得甲醛吸附能力增强,进一步通过Boehm滴定实验和回归分析表明酸性含氧官能团(酚羟基、内酯基、羧基等)数量的增加是ACF样品甲醛吸附能力提升的主要原因。酸性含氧官能团富含C=O、C-OH等亲水基团,对甲醛的吸附十分有利。  相似文献   

2.
文章系统阐述了活性炭纤维(ACF)表面功能的设计和控制方法,介绍了ACF的比表面积、孔径分布、表面化学结构与吸附对象的关系;从ACF表面物理、化学结构的可设计化入手,全面阐述了ACF物理结构的设计和控制方法及表面化学的改性方法;并介绍了其应用效果。  相似文献   

3.
活性炭纤维的表面功能设计和控制(Ⅱ)   总被引:2,自引:0,他引:2  
章系统阐述了活性炭纤维(ACF)表面功能的设计和控制方法,介绍了ACF的比表面积、孔径分布、表面化学结构与吸附对象的关系;从ACF表面物理、化学结构的可设计化入手,全面阐述了ACF物理结构的设计和控制方法及表面化学的改性方法;并介绍了其应用效果。  相似文献   

4.
湿氧化改性多孔炭对低浓度苯和丁酮蒸汽的吸附   总被引:22,自引:1,他引:21  
空气中挥发性有机化合物 (VOC)严重危害人体的身体健康 ,因而研究 VOC的去除具有重要意义。该文研究了椰壳活性炭 (AC)和粘胶基活性炭纤维 (ACF)湿氧化处理后对低浓度 VOC苯和丁酮的吸附。 AC和 ACF分别用质量分数为 30 %和 5 0 %的 H2 O2 、浓 HNO3进行湿氧化处理。采用 X射线光电子能谱 (XPS)和氮气容量法研究了 ACF,采用扫描电镜 (SEM)研究了 AC处理前后性质的变化。并利用热重分析仪 (TGA)研究了对挥发性有机化合物丁酮和苯的吸附。实验结果表明 :ACF经 H2 O2 处理后具有活化作用 ,比表面积和微孔容积都增加了 ,特别是用质量分数为 30 %的 H2 O2 处理后更有利于低浓度苯和丁酮的吸附 ;AC经湿氧化处理后 ,扫描电镜下呈现不同的微观形貌特征 ,质量分数为 30 %的 H2 O2 处理后 ,增强了对苯的吸附 ,减弱了对丁酮的吸附。  相似文献   

5.
采用溶胶-凝胶法,将脱硫多官能团薄膜负载在聚丙烯腈基活性炭纤维(ACF)上,并进行持续动态吸附和百次再生.通过实验研究分析,脱硫多官能团是以薄膜形式均匀包覆在ACF的纤维表面,脱硫多官能团薄膜封堵ACF纤维表面的部分孔洞,造成样品负载脱硫官能团ACF的比表面积、孔容和饱和吸附量都要略小于ACF,但对于硫化物的指向性和吸附量反而增大;百次反洗再生后,包覆在ACF纤维上的脱硫官能团薄膜会有一定程度的开裂翘起,使原本被封堵的孔隙结构重新露出,提高了样品比表面积、孔容和饱和吸附量.经过预膜剂原位再生后,包覆在ACF纤维上的脱硫官能团薄膜被重新修补如初.在臭氧的作用下,除了能够转化硫化物的吸附形态,还会对载体ACF产生再生自洁作用,使ACF吸附作用的时间大大延长.  相似文献   

6.
介绍了用粘胶纤维毡在真空设备中经碳化活化工艺制备活性碳纤维 (ACF)毡的研究工作。论述了制备粘胶基 ACF毡适用的预处理介质、碳化活化原理以及工艺参数的确定 ;给出了 X射线衍射对ACF毡晶体结构分析结果。工艺试验表明 ,用真空设备制备高性能ACF切实可行。  相似文献   

7.
活性炭纤维的表面功能设计和控制(Ⅱ)   总被引:1,自引:0,他引:1  
文章系统阐述了活性炭纤维(ACF)表面功能的设计和控制方法,介绍了ACF的比表面积、孔径分布、表面化学结构与吸附对象的关系;从ACF表面物理、化学结构的可设计化入手,全面阐述了ACF物理结构的设计和控制方法及表面化学的改性方法;并介绍了其应用效果。  相似文献   

8.
活性炭纤维的表面功能设计和控制(Ⅰ)   总被引:1,自引:0,他引:1  
文章系统阐述了活性炭纤维 (ACF)表面功能的设计和控制方法 ,介绍了ACF的比表面积、孔径分布、表面化学结构与吸附对象的关系;从ACF表面物理、化学结构的可设计化入手 ,全面阐述了ACF物理结构的设计和控制方法及表面化学的改性方法;并介绍了其应用效果  相似文献   

9.
以钛酸丁酯为前驱体,采用溶胶-凝胶法制备了Fe、N离子共掺杂的、以活性炭(AC)和活性炭纤维(ACF)为载体的TiO2/AC和TiO2/ACF光催化剂.采用扫描电镜、X射线衍射仪、紫外-可见光分光光度计等对催化剂样品进行了表征.选取甲苯为模型化合物进行光催化降解实验,研究了催化剂制备过程中离子掺杂量、抑制剂种类、焙烧温度、载体种类以及循环使用次数对催化剂活性的影响.结果表明:TiO2在ACF上的分散效果好于在AC上;TiO2以颗粒状镶嵌在AC孔隙内、以膜状包覆在ACF表面,所制备的光催化剂均以锐钛矿相存在;Fe、N离子共掺杂实现了催化剂的可见光响应;以冰醋酸为抑制剂、N和Fe离子掺杂量均为8%(摩尔分数)、500℃下焙烧2 h时,所得的TiO2/ACF光催化剂对气相甲苯的降解活性最高,循环使用效果最好.  相似文献   

10.
活性炭纤维吸附处理喹啉废水的实验研究   总被引:1,自引:0,他引:1  
粘胶基活性炭纤维(ACF)经微波辐射处理后,通过低温氮气吸附法测定了比表面积SBET,用扫描电镜(SEM)表征了其显微结构,研究了活性炭纤维对喹啉模拟废水的吸附特性.结果表明,经微波辐射后的活性炭纤维其BET表面积由213.8 m2/g,增加到1 917.9 m2/g,ACF表面粗糙,增加了许多新的烧蚀点;对喹啉废水的吸附符合Freundlich吸附等温式;改性后的ACF吸附速率加快,20 min就达到吸附平衡.pH>8吸附率显著降低.吸附穿透实验表明,喹啉入口速率越大,浓度越高,其出水浓度越高,微波再生后的ACF仍有较好的吸附性能.  相似文献   

11.
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.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
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.  相似文献   

13.
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。  相似文献   

14.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

15.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

16.
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.  相似文献   

17.
王慧 《科技信息》2008,(10):240-240
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.  相似文献   

18.
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.  相似文献   

19.
In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.  相似文献   

20.
1 Rise of studies on climate change's effects on biodiversity
Until the 1980s, climate change and biodiversity were studied as two independent disciplines for more than a century. In 1992, the Ecological Society of America's annual report named climate change, biodiversity, and the sustainable ecological system as the three major global environmental issues of the twenty-first century [1].  相似文献   

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