文件检索课实习作业(3)

1

Magnel Laboratory for Concrete Research, Department of Structural Engineering, Engineering

Faculty, Technologiepark Zwijnaarde 904, B-9052 Ghent, Belgium

Research Group EnVOC, Department of Organic Chemistry, Faculty of Bioscience Engineering,

Coupure Links 653, B-9000 Ghent, Belgium

Department of Materials Science, Tampere University of Technology, Korkeakoulunkatu 6,

FIN-33720 Tampere, Finland

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Abstract: This work presents promising results for air purification by heterogeneous photocatalysis on new titanium dioxide loaded cementitious materials. A set of eight concretes and plasters is enriched with TiO2 photocatalyst by dip-coating and/or sol-gel methods. First, the macro-structural features of the cementitious materials have been studied in terms of porosity and roughness. The first parameter has been determined using mercury intrusion porosimetry or by vacuum saturation, and ranged between 9 and 75%, with the highest values obtained for autoclaved aerated white concrete. Surface roughness, determined by laser profilometry, has been characterized by the Ra factor. This expresses the mean deviation of the profile from the centre line and ranged between 0.7 and 252 μm, with the highest value obtained for conventional grey concrete finished with surface brush. Secondly, the weathering resistance of the TiO2 coatings has been determined by exposing them to different abrasive conditions and by performing SEM-Edax analyses to measure quantitatively the coating's titanium content. Hereby, it is shown that high porosity and roughness are favourable for TiO2 particles retention. Finally, the preliminary air purification potential of both dip-coated and sol-gel coated TiO2 enriched concrete samples has been investigated on lab-scale using toluene as a model pollutant. High removal efficiencies (up to 86%) were obtained with the dip-coated samples, indicating their attractive photocatalytic properties for future application as air purifying building materials. © 2009 Elsevier Ltd. All rights reserved. (32 refs.) Database: Compendex

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3.Experimental study of photocatalytic concrete products for air purification

Hüsken, G.1; Hunger, M.1; Brouwers, H.J.H.1

Source: Building and Environment, v 44, n 12, p 2463-2474, December 2009; ISSN: 03601323; DOI: 10.1016/j.buildenv.2009.04.010; Publisher: Elsevier Ltd

Author affiliation:

1

Department of Civil Engineering, Faculty of Engineering Technology, University of Twente,

P.O. Box 217, 7500 AE Enschede, Netherlands

Abstract: Air quality in inner-city areas is a topic which receives much attention nowadays but in the coming years, the overall interest on this topic will become even bigger. One major concern is caused by the reduction of the limiting values given by the European Council Directive 1999/30/EC [Relating to limit values for sulphur dioxide, nitrogen dioxide and oxides of nitrogen, particulate matter and lead in ambient air. Official Journal of the European Communities 1999, L 163/41-60] and increasing traffic rates especially for diesel powered passenger cars and freight vehicles. A promising approach for solving the problem of nitrogen oxides (NOx) is the photochemical conversion of nitrogen oxides to low concentrated nitrates due to heterogeneous photocatalytic oxidation (PCO) using titanium dioxide (TiO2) as photocatalyst. A variety of products containing TiO2 are already available on the European market and their working mechanism under laboratory conditions is proven. However, there is still a lack of transforming the experimental results obtained under laboratory conditions to practical applications considering real world conditions. This paper presents the research conducted on photocatalytic concrete products with respect to the evaluation of air-purifying properties. The degradation process of nitric oxide (NO) under laboratory conditions is studied using a test setup for measuring the performance of photocatalytic active concrete products. The test setup uses the UV-A induced degradation of NO and is oriented on the ISO standard ISO 22197-1:2007. Besides the introduction of the test setup, a uniform measuring procedure is presented to the reader which allows for an evaluation and direct comparison of the performance of photocatalytic active concrete products. This kind of direct comparison was not possible so far. Furthermore, the results of a comparative study on varying photocatalytic concrete products of the European market will be discussed. © 2009 Elsevier Ltd. All rights reserved. (26 refs.) Database: Compendex

学位论文（找1篇）：说明使用的数据库(中国知网)

文检课作业

光触媒净化中央空调系统内有害微生物的研究

Research of Photocatalyst’s Purifying Harmful Microorganisms in Central Air Conditiong System

【作者】 朱宇； 【导师】 冯国会

【作者基本信息】 沈阳建筑大学， 供热、供燃气、通风及空调工程， 2011， 硕士

【摘要】 近年来,随着经济的快速发展,越来越 多的城市建筑物,特别是公共场所安装中央空调系统用于改善室内空气质量。中央空调系统犹如人的动脉血管,如果设计、运行、管理不善,一旦被污染将迅速扩 散,成为室内空气污染源,直接危害建筑物内人们的健康和生命安全。室内空气质量状况越来越受到人们重视,研究有效治理室内空气污染物的净化技术十分必要, 提高室内空气质量、消除室内空气污染已经成为全球的战略任务,并已引起社会各方面的广泛关注。光触媒净化技术是一种极具发展潜力的净化手段,针对目前室内 空气净化不尽人意的现状,本文主要研究光触媒对于中央空调系统内有害微生物的杀灭效果,新兴光触媒净化技术将是室内空气净化中最具前景的技术之一。本实验 主要研究光触媒对于中央空调系统内有害细菌的净化效果,采用无纺布擦拭法,对沈阳市百家乐超市内中央空调回风口风管表面及过滤网表面的积尘进行采集并带回 实验室进行检测,检测地点为沈阳建筑大学微生物实验室。通过对风管表面积尘检测,依照《公共建筑集中空调系统卫生规范》,判断中央空调系统的污染情况。通 过对过滤网表面积尘的检测,找出积尘中细菌的优势菌种。通过光触媒涂液对两种优势菌种抑菌性能的实验,分析光触...

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