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用矿物填料替代水泥对纳米TiO改性水泥基复合材料的氮氧化物空气净化效率和光催化反应选择性的影响。

Effect of Cement Substitution with Mineral Fillers on NO Air-Purification Efficiency and Photocatalytic Reaction Selectivity of Nano-TiO-Modified Cementitious Composites.

作者信息

Chilmon Karol, Kalinowski Maciej, Jackiewicz-Rek Wioletta

机构信息

Faculty of Civil Engineering, Warsaw University of Technology, 00-637 Warsaw, Poland.

出版信息

Materials (Basel). 2024 Nov 25;17(23):5775. doi: 10.3390/ma17235775.

DOI:10.3390/ma17235775
PMID:39685211
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11641952/
Abstract

This research investigated the properties of photocatalytic cementitious composites, including their air-purification efficiency. A method of characterizing the removal of airborne pollutants (nitrogen oxides), simulating the actual NO concentration and irradiation conditions in Warsaw, Poland, in the autumn/winter season was established. The study analyzed the impact of changes in the composition of cement mortars-partial substitution of the binder with mineral fillers-on the properties of the external photoactive surface of the composite. The designed experimental plan included both quantitative and qualitative variables (type and amount of fillers used). It was found that the photocatalytic performance of the composite was correlated with its pore total content and pore size distribution-the higher the content of mineral fillers, the lower the porosity and the less effective its photocatalytic properties. The selectivity of the photocatalytic NO reactions also deteriorated as the content of the mineral fillers increased. The study confirmed the validity of increasing the binder content in cementitious composites to enhance their photocatalytic performance.

摘要

本研究调查了光催化水泥基复合材料的性能，包括其空气净化效率。建立了一种表征空气中污染物（氮氧化物）去除情况的方法，该方法模拟了波兰华沙秋冬季节的实际NO浓度和辐照条件。该研究分析了水泥砂浆组成变化——用矿物填料部分替代粘结剂——对复合材料外部光活性表面性能的影响。设计的实验方案包括定量和定性变量（所用填料的类型和数量）。研究发现，复合材料的光催化性能与其总孔隙含量和孔径分布相关——矿物填料含量越高，孔隙率越低，其光催化性能越差。随着矿物填料含量的增加，光催化NO反应的选择性也会降低。该研究证实了增加水泥基复合材料中粘结剂含量以提高其光催化性能的有效性。

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