SiO2@N-TiO2光催化剂对水泥表层改性研究
作者:
作者单位:

1.济南大学 建筑材料制备与测试技术重点实验室, 山东 济南 250000;2.山东华邦建设集团有限公司, 山东 济南 250000

作者简介:

刘绍锐(2000—),男,山东泰安人,济南大学硕士生.E-mail:1057760161@qq.com

通讯作者:

程 新(1963—),男,山东青岛人,济南大学教授,博士生导师,博士.E-mail:chengxin@ujn.edu.cn

中图分类号:

TU52

基金项目:

国家自然科学基金资助项目(U22A20126);济南市“一事一议”顶尖人才项目;泰山学者攀登计划;博士后创新项目专项类别(SDCX-ZG-202203050)


Modification of Cement Surface Layer by SiO2@N-TiO2 Photocatalyst
Author:
Affiliation:

1.Key Laboratory of Building Materials Preparation and Testing Technology, University of Jinan, Jinan 250000, China;2.Shandong Winbond Construction Group, Jinan 250000, China

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    摘要:

    为解决TiO2喷涂于水泥基材料表面时与水泥基材料表面结合不紧密等问题,通过改变尿素的掺加顺序、掺量以及反应温度,设计并合成了不同的SiO2@N-TiO2光催化样品,并且研究了其对目标污染物(氮氧化物(NOx)和罗丹明B(RhB))的降解效果.结果表明:在55 ℃掺加尿素后的SiO2@N-TiO2光催化样品对NOx的降解效率可达68%,较未掺尿素的SiO2@TiO2光催化样品提高了278%;对RhB的降解率可达38%,较SiO2@TiO2有小幅提升;SiO2@N-TiO2光催化剂喷涂到水泥基材料表面之后,对NOx的降解率降低较少,证明其与水泥基材料表面具有良好的耦合能力.

    Abstract:

    To solve the problem of TiO2 can not be tightly bonded with the surface of cement-based material, different photocatalytic materials(SiO2@N-TiO2) were designed and synthesized by changing the addition order and amount of urea and the reaction temperature. Their degradation effects on the target pollutants(NOx and rhodamine B) were studied. The results show that the degradation efficiency of NOx in the sample after adding urea at 55 ℃ can reach 68%, which is 278% higher than that of the unmodified sample(SiO2@TiO2). The degradation rate of rhodamine B can reach 38%, which is a little higher than that of SiO2@TiO2. It still has good degradation efficiency for NOx after being applied to the surface of cement-based materials, which proves that the photocatalyst has good coupling ability with the cement surface.

    图1 T55-10、S-10、SD-15以及TD55-15的XRD图谱Fig.1 XRD patterns of T55-10, S-10, SD-15 and TD55-15
    图2 尿素掺量及温度对光催化降解氮氧化物能力的影响Fig.2 Effect of urea content and temperature on photocatalytic degradation of nitrogen oxides
    图3 不同尿素掺量样品对RhB的降解效果Fig.3 Degradation of RhB by samples with different urea contents
    图4 不同尿素掺量样品的漫反射效果Fig.4 Diffuse reflection effects of samples with different urea contents
    图5 不同样品在水泥基表面降解RhB的效果Fig.5 Effect of different samples on degradation of RhB on cement-based surface
    图6 样品T55-10冲淋前后光催化降解氮氧化物的能力Fig.6 Photocatalytic degradation of sample T55-10 of nitrogen oxides before and after flushing
    图7 样品T55-10喷涂于水泥基材料表面的SEM及EDS照片Fig.7 SEM and EDS images of sample T55-10 sprayed on surface of cementitious materials
    表 1 水泥的化学组成Table 1 Chemical composition(by mass) of cement
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引用本文

刘绍锐,刘春平,王丹,程新.SiO2@N-TiO2光催化剂对水泥表层改性研究[J].建筑材料学报,2024,27(7):659-666

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  • 收稿日期:2023-10-15
  • 最后修改日期:2023-11-16
  • 在线发布日期: 2024-08-09
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