Abstract
Cement-based composite is one of the essential building materials that has been widely used in infrastructure and facilities. During the service of cement-based materials, the performance of cement-based materials will be affected after the cement surface is exposed to pollutants. Not only can the surface of cement treated with a photocatalyst degrade pollutants, but it can also protect the cement-based materials from being destroyed. In this study, graphite carbon nitride-silica composite materials were synthesized by thermal polymerization using nanosilica and urea as raw materials. The effect of nanosilica content and specific surface area were investigated with the optimal condition attained to be 0.15 g and 300 m2/g, respectively. An X-ray diffractometer, thermogravimetric analyzer, scanning electron microscope, a Brunauer–Emmett–Teller (BET) specific surface area analyzer and ultraviolet-visible spectrophotometer were utilized for the characterization of as-prepared graphite carbon nitride-silica composite materials. Subsequently, the surface of cement-based materials was treated with graphite carbon nitride-silica composite materials by the one-sided immersion and brushing methods for the study of photocatalytic performance. By comparing the degradation effect of Rhodamine B, it was found that the painting method is more suitable for the surface treatment of cement. In addition, through the reaction of calcium hydroxide and graphite carbon nitride-silica composite materials, it was found that the combination of graphite carbon nitride-silica composite materials and cement is through C-S-H gel.
Highlights
In recent years, with the continuous improvement of the level of economic development and industrialization, pollution has become more and more serious, and the environment has been greatly damaged and even threatens human health [1,2]
With the deepening of research, the emergence of some problems has hindered the development of titanium dioxide photocatalytic cement [24,25]
The sprayed cement was put in the dark for curing for 24 h
Summary
With the continuous improvement of the level of economic development and industrialization, pollution has become more and more serious, and the environment has been greatly damaged and even threatens human health [1,2]. It has been suggested to combine photocatalytic technology with building materials [7,8,9,10]. Photocatalytic catalysts are excited by the energy of sunlight and can degrade surrounding pollutants [11,12,13]. Many efforts have been made to combine TiO2 photocatalysts with cement [14,15] to achieve photocatalytic degradation capabilities [16,17,18] and self-cleaning capabilities [19,20,21,22,23]. A new type of visible light photocatalytic cement with a stable structure should be designed to solve the above problems
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