纳米TiO2光催化混凝土研究进展
Study Progress of Photocatalytic of Concrete with Nano·TiO2
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关键词：
光催化；水泥混凝土；环境保护；降解
Key words：
Photocatalysis; Cement concrete; Environment protection; Degradation
刊期：
２０18年第6期
DOI：
文章编号：
1000-4637（2018）06-20-04
基金项目：
基金项目：国家重点研发计划（2016YFC0701004）；国家自然科学基金（51402246）。
作者：
罗 凯1，2，卢忠远1，李 军1，蒋 俊1，2，白 媛1，2
单位：
1.环境友好能源材料国家重点实验室，绵阳 621010；2.西南科技大学材料 科学与工程学院，绵阳 621010
摘要
摘 要：目前，在环保领域中研究以TiO2为光触媒，制备具有光催化氧化能力的节能、高效的绿色环保材料成为热点。将纳米TiO2应用于混凝土中生产光催化混凝土，赋予了混凝土降解大气中的污染物和建筑物表面微生物的功能，如汽车尾气以及建筑物表面微生物的的降解。本文论述了纳米TiO2作为光催化剂的反应机理，综述了具有光催化性能的混凝土材料的制备方法、应用研究现状及影响光催化性能的因素，总结了光催化混凝土生产应用上的问题，并展望了下一步的研究方向。
Abstract: Currently, one of the research hot spots in the field of environmental protection is to use TiO2 as photocatalyst to prepare an energy-saving and highly-efficient green environmental protection material capable of photocatalytic oxidation. It is important for enriching the function of concrete, and the concrete can degrade pollutants in the atmosphere, such as automobile exhaust and the degradation of building surface microorganisms when applying TiO2 to concrete production. Here, the mechanism of TiO2 photocatalysis is introduced. The preparation methods, application research status and factors that influence the photocatalytic performance of concrete materials with photocatalytic properties are reviewed, and the problems to be solved in the production and application of photocatalytic concrete are summarized.
结论
光催化混凝土兼具节能和绿色环保的优点，但影响因素众多，技术复杂，研究还欠充分，实际制备过程中仍然会发生很多难以解决的困难，应在以下几个方面进一步开展研究：
（1）光催化混凝土在锐钛矿型TiO2的光吸收局限于紫外区，太阳光光谱中能够激发TiO2表面电子的紫外光低于5%，对太阳能的利用效率仅在1%左右[18]，研究如何拓宽TiO2对可见光的吸收范围，以及进一步研究TiO2的微观结构，改变其禁带宽度，提高对太阳能的利用效率，以何种方式改善催化剂表面的结构促进其电子空穴对的产生。
（2）光催化混凝土的光催化活性持续时间超短，本来就存在成本昂贵的代价确仍然保证不了其有价值的应用，这主要是由于灰尘或降解产物将催化剂覆盖，使其无法暴露在气体和阳光下，所光催化混凝土需要定期清洗才能满足够继续发挥光催化性能的作用，因此，找到一种合适的光催化混凝土制备方法是迫切需要解决的问题，可不可以将透光混凝土与泡沫混凝土相结合来生产光催化混凝土，需要进一步研究。
（3）纳米TiO2材料的使用，使其可以通过多种途径如空气、水、土壤、废物处置、食物链等方式进入生态环境，是否会污染生态环境，危害人体健康，目前都是未知问题[30]。
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引用本文
罗凯,卢忠远,李军,等.纳米TiO2光催化混凝土研究进展[J].混凝土与水泥制品,2018(6):20-23.
LUO K,LU Z Y,LI J,et al.Study Progress of Photocatalytic of Concrete with Nano·TiO2[J].China Concrete and Cement Products,2018(6):20-23.
上一个： 锂渣在制备高性能混凝土中的试验研究
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