TiO2 and TiO2-SiO2 coated cement: Comparison of mechanic and photocatalytic properties
TiO2 and TiO2-SiO2 coated cement: Comparison of mechanic and photocatalytic properties
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DOI：
10.1016/j.apcatb.2014.09.079
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发表时间：
2015-11-01
影响因子：
22.1
通讯作者：
Faraldos, M.
中科院分区：
文献类型：
--
作者：
Mendoza, C.;Valle, A.;Faraldos, M.
纳米材料在建筑业中的一个越来越为人所知的应用与半导体的光活性能力有关，其中纳米锐钛矿TiO（2）可能是最知名的光催化半导体，并且具有强氧化能力。为了分析四种TiO 2涂层的光效率以及SiO2中间层对TiO 2涂层机械性能和光催化降解罗丹明B（RhB）和NOx活性的影响，制备了两种光催化水泥系列。首先，在水泥砂浆表面涂覆三种商业TiO 2悬浮液（GG 1，GC 7和CG 13）和自制的二氧化钛溶胶凝胶（TEA），然后在水泥表面涂覆一层SiO2层.所有研究的TiO 2水泥都表现出明显的光降解作用，RhB的摩尔转化率几乎达到了53%以上，NOx的光氧化率也达到了53%以上.然而，虽然SiO2层之间的砂浆和TiO 2-水泥沉积没有稳定的商业TiO 2涂层，观察到良好的附着力时，二氧化硅应用关节自制的二氧化钛凝胶（TEA），可能是由于SiO2和TiO 2凝胶之间遇到的相互作用。CG 7-Si-Cem在较短的照射时间下表现出高速率，但TEA-Cem和TEA-Si-Cem可以被认为是非常令人感兴趣和潜在的光催化砂浆，这是由于有用的机械性能，具有非常好的涂层粘附性，提供了有前途的户外用途，以及在RhB和NOx光氧化中的良好光效率。(C)2014爱思唯尔有限公司版权所有。
An increasingly known application of nanomaterials in the construction industry is related to the photoactivity ability of semiconductors, where nano-anataseTiO(2) is perhaps the most well-known photocatalytic semiconductor and one which possesses a strong oxidizing capability. To analyze the photo-efficiency of four TiO2 coatings and the effect of SiO2 interlayer on the mechanic and photocatalytic activity in Rhodamine B (RhB) and NOx photodegradation, two photocatalytic cement series have been prepared. First, cement mortar was coated with three commercial TiO2 suspensions (GG1, GC7 and CG13) and a home-made titania sol gel (TEA), and secondly an insertion of a SiO2 layer was applied on cement surface before spraying the TiO2 layer.All studied TiO2-cements exhibited a significant RhB and NOx photodegradation, arising almost total RhB molar conversions, and upper 53% for NOx photo-oxidation respectively. Nevertheless, although SiO2 layer deposited in between mortar and TiO2-cement did not stabilize the commercial TiO2 coatings, a good adhesion was observed when silica was applied joint to the home-made titania gel (TEA), probably as a consequence of the interactions encountered between SiO2 and TiO2 gels. CG7-Si-Cem exhibited high rate at shorter irradiation times, but TEA-Cem and TEA-Si-Cem can be considered as very interesting and potential photocatalytic mortars due to useful mechanical properties, with a very good coatings adhesion that provides promising outdoor use, and good photo-efficiencies in RhB and NOx photo-oxidation. (C) 2014 Elsevier B.V. All rights reserved.